libfdisk/src/script.c

   1
   2 #include "fdiskP.h"
   3 #include "strutils.h"
   4 #include "carefulputc.h"
   5 #include "mangle.h"
   6
   7 /**
   8  * SECTION: script
   9  * @title: Script
  10  * @short_description: complex way to create and dump partition table
  11  *
  12  * This interface allows to compose in-memory partition table with all details,
  13  * write all partition table description to human readable text file, read it
  14  * from the file, and apply the script to on-disk label.
  15  *
  16  * The libfdisk scripts are based on original sfdisk script (dumps). Each
  17  * script has two parts: script headers and partition table entries
  18  * (partitions). The script is possible to dump in JSON too (read JSON is not
  19  * implemented yet).
  20  *
  21  * For more details about script format see sfdisk man page.
  22  *
  23  * There are four ways how to build the script:
  24  *
  25  * - read the current on-disk partition table by fdisk_script_read_context())
  26  * - read it from text file by fdisk_script_read_file()
  27  * - read it interactively from user by fdisk_script_read_line() and fdisk_script_set_fgets()
  28  * - manually in code by fdisk_script_set_header() and fdisk_script_set_table()
  29  *
  30  * The read functions fdisk_script_read_context() and fdisk_script_read_file()
  31  * creates always a new script partition table. The table (see
  32  * fdisk_script_get_table()) is possible to modify by standard
  33  * fdisk_table_...() functions and then apply by fdisk_apply_script().
  34  *
  35  * Note that script API is fully non-interactive and forces libfdisk to not use
  36  * standard dialog driven partitioning as we have in fdisk(8).
  37  */
  38
  39 /* script header (e.g. unit: sectors) */
  40 struct fdisk_scriptheader {
  41         struct list_head        headers;
  42         char                    *name;
  43         char                    *data;
  44 };
  45
  46 /* script control struct */
  47 struct fdisk_script {
  48         struct fdisk_table      *table;
  49         struct list_head        headers;
  50         struct fdisk_context    *cxt;
  51
  52         int                     refcount;
  53         char                    *(*fn_fgets)(struct fdisk_script *, char *, size_t, FILE *);
  54         void                    *userdata;
  55
  56         /* parser's state */
  57         size_t                  nlines;
  58         struct fdisk_label      *label;
  59
  60         unsigned int            json : 1,               /* JSON output */
  61                                 force_label : 1;        /* label: <name> specified */
  62 };
  63
  64 static void fdisk_script_free_header(struct fdisk_scriptheader *fi)
  65 {
  66         if (!fi)
  67                 return;
  68
  69         DBG(SCRIPT, ul_debugobj(fi, "free header %s", fi->name));
  70         free(fi->name);
  71         free(fi->data);
  72         list_del(&fi->headers);
  73         free(fi);
  74 }
  75
  76 /**
  77  * fdisk_new_script:
  78  * @cxt: context
  79  *
  80  * The script hold fdisk_table and additional information to read/write
  81  * script to the file.
  82  *
  83  * Returns: newly allocated script struct.
  84  */
  85 struct fdisk_script *fdisk_new_script(struct fdisk_context *cxt)
  86 {
  87         struct fdisk_script *dp = NULL;
  88
  89         dp = calloc(1, sizeof(*dp));
  90         if (!dp)
  91                 return NULL;
  92
  93         DBG(SCRIPT, ul_debugobj(dp, "alloc"));
  94         dp->refcount = 1;
  95         dp->cxt = cxt;
  96         fdisk_ref_context(cxt);
  97
  98         INIT_LIST_HEAD(&dp->headers);
  99         return dp;
 100 }
 101
 102 /**
 103  * fdisk_new_script_from_file:
 104  * @cxt: context
 105  * @filename: path to the script file
 106  *
 107  * Allocates a new script and reads script from @filename.
 108  *
 109  * Returns: new script instance or NULL in case of error (check errno for more details).
 110  */
 111 struct fdisk_script *fdisk_new_script_from_file(struct fdisk_context *cxt,
 112                                                  const char *filename)
 113 {
 114         int rc;
 115         FILE *f;
 116         struct fdisk_script *dp, *res = NULL;
 117
 118         assert(cxt);
 119         assert(filename);
 120
 121         DBG(SCRIPT, ul_debug("opening %s", filename));
 122         f = fopen(filename, "r");
 123         if (!f)
 124                 return NULL;
 125
 126         dp = fdisk_new_script(cxt);
 127         if (!dp)
 128                 goto done;
 129
 130         rc = fdisk_script_read_file(dp, f);
 131         if (rc) {
 132                 errno = -rc;
 133                 goto done;
 134         }
 135
 136         res = dp;
 137 done:
 138         fclose(f);
 139         if (!res)
 140                 fdisk_unref_script(dp);
 141         else
 142                 errno = 0;
 143
 144         return res;
 145 }
 146
 147 /**
 148  * fdisk_ref_script:
 149  * @dp: script pointer
 150  *
 151  * Increments reference counter.
 152  */
 153 void fdisk_ref_script(struct fdisk_script *dp)
 154 {
 155         if (dp)
 156                 dp->refcount++;
 157 }
 158
 159 static void fdisk_reset_script(struct fdisk_script *dp)
 160 {
 161         assert(dp);
 162
 163         DBG(SCRIPT, ul_debugobj(dp, "reset"));
 164
 165         if (dp->table)
 166                 fdisk_reset_table(dp->table);
 167
 168         while (!list_empty(&dp->headers)) {
 169                 struct fdisk_scriptheader *fi = list_entry(dp->headers.next,
 170                                                   struct fdisk_scriptheader, headers);
 171                 fdisk_script_free_header(fi);
 172         }
 173         INIT_LIST_HEAD(&dp->headers);
 174 }
 175
 176 /**
 177  * fdisk_unref_script:
 178  * @dp: script pointer
 179  *
 180  * Decrements reference counter, on zero the @dp is automatically
 181  * deallocated.
 182  */
 183 void fdisk_unref_script(struct fdisk_script *dp)
 184 {
 185         if (!dp)
 186                 return;
 187
 188         dp->refcount--;
 189         if (dp->refcount <= 0) {
 190                 fdisk_reset_script(dp);
 191                 fdisk_unref_context(dp->cxt);
 192                 fdisk_unref_table(dp->table);
 193                 DBG(SCRIPT, ul_debugobj(dp, "free script"));
 194                 free(dp);
 195         }
 196 }
 197
 198 /**
 199  * fdisk_script_set_userdata
 200  * @dp: script
 201  * @data: your data
 202  *
 203  * Sets data usable for example in callbacks (e.g fdisk_script_set_fgets()).
 204  *
 205  * Returns: 0 on success, <0 on error.
 206  */
 207 int fdisk_script_set_userdata(struct fdisk_script *dp, void *data)
 208 {
 209         assert(dp);
 210         dp->userdata = data;
 211         return 0;
 212 }
 213
 214 /**
 215  * fdisk_script_get_userdata
 216  * @dp: script
 217  *
 218  * Returns: user data or NULL.
 219  */
 220 void *fdisk_script_get_userdata(struct fdisk_script *dp)
 221 {
 222         assert(dp);
 223         return dp->userdata;
 224 }
 225
 226 static struct fdisk_scriptheader *script_get_header(struct fdisk_script *dp,
 227                                                      const char *name)
 228 {
 229         struct list_head *p;
 230
 231         list_for_each(p, &dp->headers) {
 232                 struct fdisk_scriptheader *fi = list_entry(p, struct fdisk_scriptheader, headers);
 233
 234                 if (strcasecmp(fi->name, name) == 0)
 235                         return fi;
 236         }
 237
 238         return NULL;
 239 }
 240
 241 /**
 242  * fdisk_script_get_header:
 243  * @dp: script instance
 244  * @name: header name
 245  *
 246  * Returns: pointer to header data or NULL.
 247  */
 248 const char *fdisk_script_get_header(struct fdisk_script *dp, const char *name)
 249 {
 250         struct fdisk_scriptheader *fi;
 251
 252         assert(dp);
 253         assert(name);
 254
 255         fi = script_get_header(dp, name);
 256         return fi ? fi->data : NULL;
 257 }
 258
 259 /**
 260  * fdisk_script_set_header:
 261  * @dp: script instance
 262  * @name: header name
 263  * @data: header data (or NULL)
 264  *
 265  * The headers are used as global options for whole partition
 266  * table, always one header per line.
 267  *
 268  * If no @data is specified then the header is removed. If header does not exist
 269  * and @data is specified then a new header is added.
 270  *
 271  * Note that libfdisk allows to specify arbitrary custom header, the default
 272  * built-in headers are "unit" and "label", and some label specific headers
 273  * (for example "uuid" and "name" for GPT).
 274  *
 275  * Returns: 0 on success, <0 on error
 276  */
 277 int fdisk_script_set_header(struct fdisk_script *dp,
 278                             const char *name,
 279                             const char *data)
 280 {
 281         struct fdisk_scriptheader *fi;
 282
 283         if (!dp || !name)
 284                 return -EINVAL;
 285
 286         fi = script_get_header(dp, name);
 287         if (!fi && !data)
 288                 return 0;       /* want to remove header that does not exist, success */
 289
 290         if (!data) {
 291                 DBG(SCRIPT, ul_debugobj(dp, "freeing header %s", name));
 292
 293                 /* no data, remove the header */
 294                 fdisk_script_free_header(fi);
 295                 return 0;
 296         }
 297
 298         if (!fi) {
 299                 int rc;
 300
 301                 DBG(SCRIPT, ul_debugobj(dp, "setting new header %s='%s'", name, data));
 302
 303                 /* new header */
 304                 fi = calloc(1, sizeof(*fi));
 305                 if (!fi)
 306                         return -ENOMEM;
 307                 INIT_LIST_HEAD(&fi->headers);
 308
 309                 rc = strdup_to_struct_member(fi, name, name);
 310                 if (!rc)
 311                         rc = strdup_to_struct_member(fi, data, data);
 312                 if (rc) {
 313                         fdisk_script_free_header(fi);
 314                         return rc;
 315                 }
 316                 list_add_tail(&fi->headers, &dp->headers);
 317         } else {
 318                 /* update existing */
 319                 char *x = strdup(data);
 320
 321                 DBG(SCRIPT, ul_debugobj(dp, "update '%s' header '%s' -> '%s'", name, fi->data, data));
 322
 323                 if (!x)
 324                         return -ENOMEM;
 325                 free(fi->data);
 326                 fi->data = x;
 327         }
 328
 329         if (strcmp(name, "label") == 0)
 330                 dp->label = NULL;
 331
 332         return 0;
 333 }
 334
 335 /**
 336  * fdisk_script_get_table:
 337  * @dp: script
 338  *
 339  * The table represents partitions holded by the script. The table is possible to
 340  * fill by fdisk_script_read_context() or fdisk_script_read_file(). All the "read"
 341  * functions remove old partitions from the table. See also fdisk_script_set_table().
 342  *
 343  * Returns: NULL or script table.
 344  */
 345 struct fdisk_table *fdisk_script_get_table(struct fdisk_script *dp)
 346 {
 347         assert(dp);
 348
 349         if (!dp->table)
 350                 /*
 351                  * Make sure user has access to the same table as script. If
 352                  * there is no table then create a new one and reuse it later.
 353                  */
 354                 dp->table = fdisk_new_table();
 355
 356         return dp->table;
 357 }
 358
 359 /**
 360  * fdisk_script_set_table:
 361  * @dp: script
 362  * @tb: table
 363  *
 364  * Replaces table used by script and creates a new reference to @tb. This
 365  * function allows to generate a new script table independently on the current
 366  * context and without any file reading.
 367  *
 368  * This is useful for example to create partition table with the same basic
 369  * settings (e.g. label-id, ...) but with different partitions -- just call
 370  * fdisk_script_read_context() to get current settings and then
 371  * fdisk_script_set_table() to set a different layout.
 372  *
 373  * If @tb is NULL then the current script table is unreferenced.
 374  *
 375  * Note that script read_ functions (e.g. fdisk_script_read_context()) create
 376  * always a new script table.
 377  *
 378  * Returns: 0 on success, <0 on error
 379  */
 380 int fdisk_script_set_table(struct fdisk_script *dp, struct fdisk_table *tb)
 381 {
 382         if (!dp)
 383                 return -EINVAL;
 384
 385         fdisk_ref_table(tb);
 386         fdisk_unref_table(dp->table);
 387         dp->table = tb;
 388
 389         DBG(SCRIPT, ul_debugobj(dp, "table replaced"));
 390         return 0;
 391 }
 392
 393 static struct fdisk_label *script_get_label(struct fdisk_script *dp)
 394 {
 395         assert(dp);
 396         assert(dp->cxt);
 397
 398         if (!dp->label) {
 399                 dp->label = fdisk_get_label(dp->cxt,
 400                                         fdisk_script_get_header(dp, "label"));
 401                 DBG(SCRIPT, ul_debugobj(dp, "label '%s'", dp->label ? dp->label->name : ""));
 402         }
 403         return dp->label;
 404 }
 405
 406 /**
 407  * fdisk_script_get_nlines:
 408  * @dp: script
 409  *
 410  * Returns: number of parsed lines or <0 on error.
 411  */
 412 int fdisk_script_get_nlines(struct fdisk_script *dp)
 413 {
 414         assert(dp);
 415         return dp->nlines;
 416 }
 417
 418 /**
 419  * fdisk_script_has_force_label:
 420  * @dp: script
 421  *
 422  * Label has been explicitly specified in the script.
 423  *
 424  * Since: 2.30
 425  *
 426  * Returns: true if "label: name" has been parsed.
 427  */
 428 int fdisk_script_has_force_label(struct fdisk_script *dp)
 429 {
 430         assert(dp);
 431         return dp->force_label;
 432 }
 433
 434
 435 /**
 436  * fdisk_script_read_context:
 437  * @dp: script
 438  * @cxt: context
 439  *
 440  * Reads data from the @cxt context (on disk partition table) into the script.
 441  * If the context is not specified then defaults to context used for fdisk_new_script().
 442  *
 443  * Return: 0 on success, <0 on error.
 444  */
 445 int fdisk_script_read_context(struct fdisk_script *dp, struct fdisk_context *cxt)
 446 {
 447         struct fdisk_label *lb;
 448         int rc;
 449         char *p = NULL;
 450         char buf[64];
 451
 452         if (!dp || (!cxt && !dp->cxt))
 453                 return -EINVAL;
 454
 455         if (!cxt)
 456                 cxt = dp->cxt;
 457
 458         DBG(SCRIPT, ul_debugobj(dp, "reading context into script"));
 459         fdisk_reset_script(dp);
 460
 461         lb = fdisk_get_label(cxt, NULL);
 462         if (!lb)
 463                 return -EINVAL;
 464
 465         /* allocate (if not yet) and fill table */
 466         rc = fdisk_get_partitions(cxt, &dp->table);
 467         if (rc)
 468                 return rc;
 469
 470         /* generate headers */
 471         rc = fdisk_script_set_header(dp, "label", fdisk_label_get_name(lb));
 472
 473         if (!rc && fdisk_get_disklabel_id(cxt, &p) == 0 && p) {
 474                 rc = fdisk_script_set_header(dp, "label-id", p);
 475                 free(p);
 476         }
 477         if (!rc && cxt->dev_path)
 478                 rc = fdisk_script_set_header(dp, "device", cxt->dev_path);
 479         if (!rc)
 480                 rc = fdisk_script_set_header(dp, "unit", "sectors");
 481
 482         if (!rc && fdisk_is_label(cxt, GPT)) {
 483                 struct fdisk_labelitem item = FDISK_LABELITEM_INIT;
 484
 485                 /* first-lba */
 486                 rc = fdisk_get_disklabel_item(cxt, GPT_LABELITEM_FIRSTLBA, &item);
 487                 if (!rc) {
 488                         snprintf(buf, sizeof(buf), "%"PRIu64, item.data.num64);
 489                         rc = fdisk_script_set_header(dp, "first-lba", buf);
 490                 }
 491
 492                 /* last-lba */
 493                 if (!rc)
 494                         rc = fdisk_get_disklabel_item(cxt, GPT_LABELITEM_LASTLBA, &item);
 495                 if (!rc) {
 496                         snprintf(buf, sizeof(buf), "%"PRIu64, item.data.num64);
 497                         rc = fdisk_script_set_header(dp, "last-lba", buf);
 498                 }
 499
 500                 /* table-length */
 501                 if (!rc) {
 502                         size_t n = fdisk_get_npartitions(cxt);
 503                         if (n != FDISK_GPT_NPARTITIONS_DEFAULT) {
 504                                 snprintf(buf, sizeof(buf), "%zu", n);
 505                                 rc = fdisk_script_set_header(dp, "table-length", buf);
 506                         }
 507                 }
 508         }
 509
 510         if (!rc && fdisk_get_grain_size(cxt) != 2048 * 512) {
 511                 snprintf(buf, sizeof(buf), "%lu", fdisk_get_grain_size(cxt));
 512                 rc = fdisk_script_set_header(dp, "grain", buf);
 513         }
 514
 515         if (!rc) {
 516                 snprintf(buf, sizeof(buf), "%lu", fdisk_get_sector_size(cxt));
 517                 rc = fdisk_script_set_header(dp, "sector-size", buf);
 518         }
 519
 520         DBG(SCRIPT, ul_debugobj(dp, "read context done [rc=%d]", rc));
 521         return rc;
 522 }
 523
 524 /**
 525  * fdisk_script_enable_json:
 526  * @dp: script
 527  * @json: 0 or 1
 528  *
 529  * Disable/Enable JSON output format.
 530  *
 531  * Returns: 0 on success, <0 on error.
 532  */
 533 int fdisk_script_enable_json(struct fdisk_script *dp, int json)
 534 {
 535         assert(dp);
 536
 537         dp->json = json;
 538         return 0;
 539 }
 540
 541 static void fput_indent(int indent, FILE *f)
 542 {
 543         int i;
 544
 545         for (i = 0; i <= indent; i++)
 546                 fputs("   ", f);
 547 }
 548
 549 static void fput_var_separator(int *nvars, FILE *f)
 550 {
 551         if (*nvars > 0)
 552                 fputs(", ", f);
 553         ++(*nvars);
 554 }
 555
 556 static int write_file_json(struct fdisk_script *dp, FILE *f)
 557 {
 558         struct list_head *h;
 559         struct fdisk_partition *pa;
 560         struct fdisk_iter itr;
 561         const char *devname = NULL;
 562         int ct = 0, indent = 0;
 563
 564         assert(dp);
 565         assert(f);
 566
 567         DBG(SCRIPT, ul_debugobj(dp, "writing json dump to file"));
 568
 569         fputs("{\n", f);
 570
 571         fput_indent(indent, f);
 572         fputs("\"partitiontable\": {\n", f);
 573         indent++;
 574
 575         /* script headers */
 576         list_for_each(h, &dp->headers) {
 577                 struct fdisk_scriptheader *fi = list_entry(h, struct fdisk_scriptheader, headers);
 578                 const char *name = fi->name;
 579                 int num = 0;
 580
 581                 if (strcmp(name, "first-lba") == 0) {
 582                         name = "firstlba";
 583                         num = 1;
 584                 } else if (strcmp(name, "last-lba") == 0) {
 585                         name = "lastlba";
 586                         num = 1;
 587                 } else if (strcmp(name, "sector-size") == 0) {
 588                         name = "sectorsize";
 589                         num = 1;
 590                 } else if (strcmp(name, "label-id") == 0)
 591                         name = "id";
 592
 593                 fput_indent(indent, f);
 594                 fputs_quoted_json_lower(name, f);
 595                 fputs(":", f);
 596                 if (!num)
 597                         fputs_quoted_json(fi->data, f);
 598                 else
 599                         fputs(fi->data, f);
 600
 601                 if (!dp->table && fi == list_last_entry(&dp->headers, struct fdisk_scriptheader, headers))
 602                         fputc('\n', f);
 603                 else
 604                         fputs(",\n", f);
 605
 606                 if (strcmp(name, "device") == 0)
 607                         devname = fi->data;
 608         }
 609
 610
 611         if (!dp->table || fdisk_table_is_empty(dp->table)) {
 612                 DBG(SCRIPT, ul_debugobj(dp, "script table empty"));
 613                 goto done;
 614         }
 615
 616         DBG(SCRIPT, ul_debugobj(dp, "%zu entries", fdisk_table_get_nents(dp->table)));
 617
 618         fput_indent(indent, f);
 619         fputs("\"partitions\": [\n", f);
 620         indent++;
 621
 622         fdisk_reset_iter(&itr, FDISK_ITER_FORWARD);
 623         while (fdisk_table_next_partition(dp->table, &itr, &pa) == 0) {
 624                 char *p = NULL;
 625                 int nvars = 0;
 626
 627                 ct++;
 628                 fput_indent(indent, f);
 629                 fputc('{', f);
 630                 if (devname)
 631                         p = fdisk_partname(devname, pa->partno + 1);
 632                 if (p) {
 633                         DBG(SCRIPT, ul_debugobj(dp, "write %s entry", p));
 634                         fputs("\"node\":", f);
 635                         fputs_quoted_json(p, f);
 636                         nvars++;
 637                 }
 638
 639                 if (fdisk_partition_has_start(pa)) {
 640                         fput_var_separator(&nvars, f);
 641                         fprintf(f, "\"start\":%ju", (uintmax_t)pa->start);
 642                 }
 643                 if (fdisk_partition_has_size(pa)) {
 644                         fput_var_separator(&nvars, f);
 645                         fprintf(f, "\"size\":%ju", (uintmax_t)pa->size);
 646                 }
 647                 if (pa->type && fdisk_parttype_get_string(pa->type)) {
 648                         fput_var_separator(&nvars, f);
 649                         fputs("\"type\":", f);
 650                         fputs_quoted_json(fdisk_parttype_get_string(pa->type), f);
 651                 } else if (pa->type) {
 652                         fput_var_separator(&nvars, f);
 653                         fprintf(f, "\"type\":\"%x\"", fdisk_parttype_get_code(pa->type));
 654                 }
 655
 656                 if (pa->uuid) {
 657                         fput_var_separator(&nvars, f);
 658                         fputs("\"uuid\":", f);
 659                         fputs_quoted_json(pa->uuid, f);
 660                 }
 661                 if (pa->name && *pa->name) {
 662                         fput_var_separator(&nvars, f);
 663                         fputs("\"name\":", f),
 664                         fputs_quoted_json(pa->name, f);
 665                 }
 666
 667                 /* for MBR attr=80 means bootable */
 668                 if (pa->attrs) {
 669                         struct fdisk_label *lb = script_get_label(dp);
 670
 671                         if (!lb || fdisk_label_get_type(lb) != FDISK_DISKLABEL_DOS) {
 672                                 fput_var_separator(&nvars, f);
 673                                 fputs("\"attrs\":", f);
 674                                 fputs_quoted_json(pa->attrs, f);
 675                         }
 676                 }
 677                 if (fdisk_partition_is_bootable(pa)) {
 678                         fput_var_separator(&nvars, f);
 679                         fprintf(f, "\"bootable\":true");
 680                 }
 681
 682                 if ((size_t)ct < fdisk_table_get_nents(dp->table))
 683                         fputs("},\n", f);
 684                 else
 685                         fputs("}\n", f);
 686         }
 687
 688         indent--;
 689         fput_indent(indent, f);
 690         fputs("]\n", f);
 691 done:
 692         indent--;
 693         fput_indent(indent, f);
 694         fputs("}\n}\n", f);
 695
 696         DBG(SCRIPT, ul_debugobj(dp, "write script done"));
 697         return 0;
 698 }
 699
 700 static int write_file_sfdisk(struct fdisk_script *dp, FILE *f)
 701 {
 702         struct list_head *h;
 703         struct fdisk_partition *pa;
 704         struct fdisk_iter itr;
 705         const char *devname = NULL;
 706
 707         assert(dp);
 708         assert(f);
 709
 710         DBG(SCRIPT, ul_debugobj(dp, "writing sfdisk-like script to file"));
 711
 712         /* script headers */
 713         list_for_each(h, &dp->headers) {
 714                 struct fdisk_scriptheader *fi = list_entry(h, struct fdisk_scriptheader, headers);
 715                 fprintf(f, "%s: %s\n", fi->name, fi->data);
 716                 if (strcmp(fi->name, "device") == 0)
 717                         devname = fi->data;
 718         }
 719
 720         if (!dp->table || fdisk_table_is_empty(dp->table)) {
 721                 DBG(SCRIPT, ul_debugobj(dp, "script table empty"));
 722                 return 0;
 723         }
 724
 725         DBG(SCRIPT, ul_debugobj(dp, "%zu entries", fdisk_table_get_nents(dp->table)));
 726
 727         fputc('\n', f);
 728
 729         fdisk_reset_iter(&itr, FDISK_ITER_FORWARD);
 730         while (fdisk_table_next_partition(dp->table, &itr, &pa) == 0) {
 731                 char *p = NULL;
 732
 733                 if (devname)
 734                         p = fdisk_partname(devname, pa->partno + 1);
 735                 if (p) {
 736                         DBG(SCRIPT, ul_debugobj(dp, "write %s entry", p));
 737                         fprintf(f, "%s :", p);
 738                 } else
 739                         fprintf(f, "%zu :", pa->partno + 1);
 740
 741                 if (fdisk_partition_has_start(pa))
 742                         fprintf(f, " start=%12ju", (uintmax_t)pa->start);
 743                 if (fdisk_partition_has_size(pa))
 744                         fprintf(f, ", size=%12ju", (uintmax_t)pa->size);
 745
 746                 if (pa->type && fdisk_parttype_get_string(pa->type))
 747                         fprintf(f, ", type=%s", fdisk_parttype_get_string(pa->type));
 748                 else if (pa->type)
 749                         fprintf(f, ", type=%x", fdisk_parttype_get_code(pa->type));
 750
 751                 if (pa->uuid)
 752                         fprintf(f, ", uuid=%s", pa->uuid);
 753                 if (pa->name && *pa->name) {
 754                         fputs(", name=", f);
 755                         fputs_quoted(pa->name, f);
 756                 }
 757
 758                 /* for MBR attr=80 means bootable */
 759                 if (pa->attrs) {
 760                         struct fdisk_label *lb = script_get_label(dp);
 761
 762                         if (!lb || fdisk_label_get_type(lb) != FDISK_DISKLABEL_DOS)
 763                                 fprintf(f, ", attrs=\"%s\"", pa->attrs);
 764                 }
 765                 if (fdisk_partition_is_bootable(pa))
 766                         fprintf(f, ", bootable");
 767                 fputc('\n', f);
 768         }
 769
 770         DBG(SCRIPT, ul_debugobj(dp, "write script done"));
 771         return 0;
 772 }
 773
 774 /**
 775  * fdisk_script_write_file:
 776  * @dp: script
 777  * @f: output file
 778  *
 779  * Writes script @dp to the file @f.
 780  *
 781  * Returns: 0 on success, <0 on error.
 782  */
 783 int fdisk_script_write_file(struct fdisk_script *dp, FILE *f)
 784 {
 785         assert(dp);
 786
 787         if (dp->json)
 788                 return write_file_json(dp, f);
 789
 790         return write_file_sfdisk(dp, f);
 791 }
 792
 793 static inline int is_header_line(const char *s)
 794 {
 795         const char *p = strchr(s, ':');
 796
 797         if (!p || p == s || !*(p + 1) || strchr(s, '='))
 798                 return 0;
 799
 800         return 1;
 801 }
 802
 803 /* parses "<name>: value", note modifies @s*/
 804 static int parse_line_header(struct fdisk_script *dp, char *s)
 805 {
 806         size_t i;
 807         char *name, *value;
 808         static const char *supported[] = {
 809                 "label", "unit", "label-id", "device", "grain",
 810                 "first-lba", "last-lba", "table-length", "sector-size"
 811         };
 812
 813         DBG(SCRIPT, ul_debugobj(dp, "   parse header '%s'", s));
 814
 815         if (!s || !*s)
 816                 return -EINVAL;
 817
 818         name = s;
 819         value = strchr(s, ':');
 820         if (!value)
 821                 return -EINVAL;
 822         *value = '\0';
 823         value++;
 824
 825         ltrim_whitespace((unsigned char *) name);
 826         rtrim_whitespace((unsigned char *) name);
 827         ltrim_whitespace((unsigned char *) value);
 828         rtrim_whitespace((unsigned char *) value);
 829
 830         if (!*name || !*value)
 831                 return -EINVAL;
 832
 833         /* check header name */
 834         for (i = 0; i < ARRAY_SIZE(supported); i++) {
 835                 if (strcmp(name, supported[i]) == 0)
 836                         break;
 837         }
 838         if (i == ARRAY_SIZE(supported))
 839                 return -ENOTSUP;
 840
 841         /* header specific actions */
 842         if (strcmp(name, "label") == 0) {
 843                 if (dp->cxt && !fdisk_get_label(dp->cxt, value))
 844                         return -EINVAL;                 /* unknown label name */
 845                 dp->force_label = 1;
 846
 847         } else if (strcmp(name, "unit") == 0) {
 848                 if (strcmp(value, "sectors") != 0)
 849                         return -EINVAL;                 /* only "sectors" supported */
 850
 851         }
 852
 853         return fdisk_script_set_header(dp, name, value);
 854 }
 855
 856 /* returns zero terminated string with next token and @str is updated */
 857 static char *next_token(char **str)
 858 {
 859         char *tk_begin = NULL,
 860              *tk_end = NULL,
 861              *end = NULL,
 862              *p;
 863         int open_quote = 0, terminated = 0;
 864
 865         for (p = *str; p && *p; p++) {
 866                 if (!tk_begin) {
 867                         if (isblank(*p))
 868                                 continue;
 869                         tk_begin = *p == '"' ? p + 1 : p;
 870                 }
 871                 if (*p == '"')
 872                         open_quote ^= 1;
 873                 if (open_quote)
 874                         continue;
 875                 if (isblank(*p) || *p == ',' || *p == ';' || *p == '"' )
 876                         tk_end = p;
 877                 else if (*(p + 1) == '\0')
 878                         tk_end = p + 1;
 879                 if (tk_begin && tk_end)
 880                         break;
 881         }
 882
 883         if (!tk_end)
 884                 return NULL;
 885
 886         end = tk_end;
 887
 888         /* skip closing quotes */
 889         if (*end == '"')
 890                 end++;
 891
 892         /* token is terminated by blank (or blank is before "," or ";") */
 893         if (isblank(*end)) {
 894                 end = (char *) skip_blank(end);
 895                 terminated++;
 896         }
 897
 898         /* token is terminated by "," or ";" */
 899         if (*end == ',' || *end == ';') {
 900                 end++;
 901                 terminated++;
 902
 903         /* token is terminated by \0 */
 904         } else if (!*end)
 905                 terminated++;
 906
 907         if (!terminated) {
 908                 DBG(SCRIPT, ul_debug("unterminated token '%s'", end));
 909                 return NULL;
 910         }
 911
 912         /* skip extra space after terminator */
 913         end = (char *) skip_blank(end);
 914
 915         *tk_end = '\0';
 916         *str = end;
 917         return tk_begin;
 918 }
 919
 920 static int next_number(char **s, uint64_t *num, int *power)
 921 {
 922         char *tk;
 923         int rc = -EINVAL;
 924
 925         assert(num);
 926         assert(s);
 927
 928         tk = next_token(s);
 929         if (tk)
 930                 rc = parse_size(tk, (uintmax_t *) num, power);
 931         return rc;
 932 }
 933
 934 static int next_string(char **s, char **str)
 935 {
 936         char *tk;
 937         int rc = -EINVAL;
 938
 939         assert(s);
 940         assert(str);
 941
 942         tk = next_token(s);
 943         if (tk) {
 944                 *str = strdup(tk);
 945                 rc = !*str ? -ENOMEM : 0;
 946         }
 947         return rc;
 948 }
 949
 950 static int partno_from_devname(char *s)
 951 {
 952         int pno;
 953         size_t sz;
 954         char *end, *p;
 955
 956         sz = rtrim_whitespace((unsigned char *)s);
 957         p = s + sz - 1;
 958
 959         while (p > s && isdigit(*(p - 1)))
 960                 p--;
 961
 962         errno = 0;
 963         pno = strtol(p, &end, 10);
 964         if (errno || !end || p == end)
 965                 return -1;
 966         return pno - 1;
 967 }
 968
 969 #define FDISK_SCRIPT_PARTTYPE_PARSE_FLAGS \
 970         (FDISK_PARTTYPE_PARSE_DATA | FDISK_PARTTYPE_PARSE_DATALAST | \
 971          FDISK_PARTTYPE_PARSE_SHORTCUT | FDISK_PARTTYPE_PARSE_ALIAS | \
 972          FDISK_PARTTYPE_PARSE_DEPRECATED)
 973
 974 /* dump format
 975  * <device>: start=<num>, size=<num>, type=<string>, ...
 976  */
 977 static int parse_line_nameval(struct fdisk_script *dp, char *s)
 978 {
 979         char *p, *x;
 980         struct fdisk_partition *pa;
 981         int rc = 0;
 982         uint64_t num;
 983         int pno;
 984
 985         assert(dp);
 986         assert(s);
 987         assert(dp->table);
 988
 989         DBG(SCRIPT, ul_debugobj(dp, "   parse script line: '%s'", s));
 990
 991         pa = fdisk_new_partition();
 992         if (!pa)
 993                 return -ENOMEM;
 994
 995         fdisk_partition_start_follow_default(pa, 1);
 996         fdisk_partition_end_follow_default(pa, 1);
 997         fdisk_partition_partno_follow_default(pa, 1);
 998
 999         /* set partno */
1000         p = strchr(s, ':');
1001         x = strchr(s, '=');
1002         if (p && (!x || p < x)) {
1003                 *p = '\0';
1004                 p++;
1005
1006                 pno = partno_from_devname(s);
1007                 if (pno >= 0) {
1008                         fdisk_partition_partno_follow_default(pa, 0);
1009                         fdisk_partition_set_partno(pa, pno);
1010                 }
1011         } else
1012                 p = s;
1013
1014         while (rc == 0 && p && *p) {
1015
1016                 DBG(SCRIPT, ul_debugobj(dp, " parsing '%s'", p));
1017                 p = (char *) skip_blank(p);
1018
1019                 if (!strncasecmp(p, "start=", 6)) {
1020                         int pow = 0;
1021                         p += 6;
1022                         rc = next_number(&p, &num, &pow);
1023                         if (!rc) {
1024                                 if (pow)        /* specified as <num><suffix> */
1025                                         num /= dp->cxt->sector_size;
1026                                 fdisk_partition_set_start(pa, num);
1027                                 fdisk_partition_start_follow_default(pa, 0);
1028                         }
1029                 } else if (!strncasecmp(p, "size=", 5)) {
1030                         int pow = 0;
1031
1032                         p += 5;
1033                         rc = next_number(&p, &num, &pow);
1034                         if (!rc) {
1035                                 if (pow)        /* specified as <num><suffix> */
1036                                         num /= dp->cxt->sector_size;
1037                                 else            /* specified as number of sectors */
1038                                         fdisk_partition_size_explicit(pa, 1);
1039                                 fdisk_partition_set_size(pa, num);
1040                                 fdisk_partition_end_follow_default(pa, 0);
1041                         }
1042
1043                 } else if (!strncasecmp(p, "bootable", 8)) {
1044                         /* we use next_token() to skip possible extra space */
1045                         char *tk = next_token(&p);
1046                         if (tk && strcasecmp(tk, "bootable") == 0)
1047                                 pa->boot = 1;
1048                         else
1049                                 rc = -EINVAL;
1050
1051                 } else if (!strncasecmp(p, "attrs=", 6)) {
1052                         p += 6;
1053                         rc = next_string(&p, &pa->attrs);
1054
1055                 } else if (!strncasecmp(p, "uuid=", 5)) {
1056                         p += 5;
1057                         rc = next_string(&p, &pa->uuid);
1058
1059                 } else if (!strncasecmp(p, "name=", 5)) {
1060                         p += 5;
1061                         rc = next_string(&p, &pa->name);
1062                         unhexmangle_string(pa->name);
1063
1064                 } else if (!strncasecmp(p, "type=", 5) ||
1065                            !strncasecmp(p, "Id=", 3)) {         /* backward compatibility */
1066                         char *type;
1067
1068                         p += ((*p == 'I' || *p == 'i') ? 3 : 5); /* "Id=", "type=" */
1069
1070                         rc = next_string(&p, &type);
1071                         if (rc)
1072                                 break;
1073
1074                         pa->type = fdisk_label_advparse_parttype(script_get_label(dp),
1075                                         type, FDISK_SCRIPT_PARTTYPE_PARSE_FLAGS);
1076                         free(type);
1077
1078                         if (!pa->type) {
1079                                 rc = -EINVAL;
1080                                 break;
1081                         }
1082                 } else {
1083                         DBG(SCRIPT, ul_debugobj(dp, "script parse error: unknown field '%s'", p));
1084                         rc = -EINVAL;
1085                         break;
1086                 }
1087         }
1088
1089         if (!rc)
1090                 rc = fdisk_table_add_partition(dp->table, pa);
1091         if (rc)
1092                 DBG(SCRIPT, ul_debugobj(dp, "script parse error: [rc=%d]", rc));
1093
1094         fdisk_unref_partition(pa);
1095         return rc;
1096 }
1097
1098 #define TK_PLUS         1
1099 #define TK_MINUS        -1
1100
1101 #define alone_sign(_sign, _p)   (_sign && (*_p == '\0' || isblank(*_p)))
1102
1103 /* simple format:
1104  * <start>, <size>, <type>, <bootable>, ...
1105  */
1106 static int parse_line_valcommas(struct fdisk_script *dp, char *s)
1107 {
1108         int rc = 0;
1109         char *p = s, *str;
1110         struct fdisk_partition *pa;
1111         enum { ITEM_START, ITEM_SIZE, ITEM_TYPE, ITEM_BOOTABLE };
1112         int item = -1;
1113
1114         assert(dp);
1115         assert(s);
1116         assert(dp->table);
1117
1118         pa = fdisk_new_partition();
1119         if (!pa)
1120                 return -ENOMEM;
1121
1122         fdisk_partition_start_follow_default(pa, 1);
1123         fdisk_partition_end_follow_default(pa, 1);
1124         fdisk_partition_partno_follow_default(pa, 1);
1125
1126         while (rc == 0 && p && *p) {
1127                 uint64_t num;
1128                 char *begin;
1129                 int sign = 0;
1130
1131                 p = (char *) skip_blank(p);
1132                 item++;
1133
1134                 if (item != ITEM_BOOTABLE) {
1135                         sign = *p == '-' ? TK_MINUS : *p == '+' ? TK_PLUS : 0;
1136                         if (sign)
1137                                 p++;
1138                 }
1139
1140                 DBG(SCRIPT, ul_debugobj(dp, " parsing item %d ('%s')", item, p));
1141                 begin = p;
1142
1143                 switch (item) {
1144                 case ITEM_START:
1145                         if (*p == ',' || *p == ';' || alone_sign(sign, p))
1146                                 fdisk_partition_start_follow_default(pa, 1);
1147                         else {
1148                                 int pow = 0;
1149
1150                                 rc = next_number(&p, &num, &pow);
1151                                 if (!rc) {
1152                                         if (pow)        /* specified as <num><suffix> */
1153                                                 num /= dp->cxt->sector_size;
1154                                         fdisk_partition_set_start(pa, num);
1155                                         pa->movestart = sign == TK_MINUS ? FDISK_MOVE_DOWN :
1156                                                         sign == TK_PLUS  ? FDISK_MOVE_UP :
1157                                                         FDISK_MOVE_NONE;
1158                                 }
1159                                 fdisk_partition_start_follow_default(pa, 0);
1160                         }
1161                         break;
1162                 case ITEM_SIZE:
1163                         if (*p == ',' || *p == ';' || alone_sign(sign, p)) {
1164                                 fdisk_partition_end_follow_default(pa, 1);
1165                                 if (sign == TK_PLUS)
1166                                         /* '+' alone means use all possible space, '-' alone means nothing */
1167                                         pa->resize = FDISK_RESIZE_ENLARGE;
1168                         } else {
1169                                 int pow = 0;
1170                                 rc = next_number(&p, &num, &pow);
1171                                 if (!rc) {
1172                                         if (pow) /* specified as <size><suffix> */
1173                                                 num /= dp->cxt->sector_size;
1174                                         else     /* specified as number of sectors */
1175                                                 fdisk_partition_size_explicit(pa, 1);
1176                                         fdisk_partition_set_size(pa, num);
1177                                         pa->resize = sign == TK_MINUS ? FDISK_RESIZE_REDUCE :
1178                                                      sign == TK_PLUS  ? FDISK_RESIZE_ENLARGE :
1179                                                         FDISK_RESIZE_NONE;
1180                                 }
1181                                 fdisk_partition_end_follow_default(pa, 0);
1182                         }
1183                         break;
1184                 case ITEM_TYPE:
1185                         if (*p == ',' || *p == ';' || alone_sign(sign, p))
1186                                 break;  /* use default type */
1187
1188                         rc = next_string(&p, &str);
1189                         if (rc)
1190                                 break;
1191
1192                         pa->type = fdisk_label_advparse_parttype(script_get_label(dp),
1193                                                 str, FDISK_SCRIPT_PARTTYPE_PARSE_FLAGS);
1194                         free(str);
1195
1196                         if (!pa->type)
1197                                 rc = -EINVAL;
1198                         break;
1199                 case ITEM_BOOTABLE:
1200                         if (*p == ',' || *p == ';')
1201                                 break;
1202                         else {
1203                                 char *tk = next_token(&p);
1204                                 if (tk && *tk == '*' && *(tk + 1) == '\0')
1205                                         pa->boot = 1;
1206                                 else if (tk && *tk == '-' && *(tk + 1) == '\0')
1207                                         pa->boot = 0;
1208                                 else if (tk && *tk == '+' && *(tk + 1) == '\0')
1209                                         pa->boot = 1;
1210                                 else
1211                                         rc = -EINVAL;
1212                         }
1213                         break;
1214                 default:
1215                         break;
1216                 }
1217
1218                 if (begin == p)
1219                         p++;
1220         }
1221
1222         if (!rc)
1223                 rc = fdisk_table_add_partition(dp->table, pa);
1224         if (rc)
1225                 DBG(SCRIPT, ul_debugobj(dp, "script parse error: [rc=%d]", rc));
1226
1227         fdisk_unref_partition(pa);
1228         return rc;
1229 }
1230
1231 /* modifies @s ! */
1232 static int fdisk_script_read_buffer(struct fdisk_script *dp, char *s)
1233 {
1234         int rc = 0;
1235
1236         assert(dp);
1237         assert(s);
1238
1239         DBG(SCRIPT, ul_debugobj(dp, "  parsing buffer"));
1240
1241         s = (char *) skip_blank(s);
1242         if (!s || !*s)
1243                 return 0;       /* nothing baby, ignore */
1244
1245         if (!dp->table && fdisk_script_get_table(dp) == NULL)
1246                 return -ENOMEM;
1247
1248         /* parse header lines only if no partition specified yet */
1249         if (fdisk_table_is_empty(dp->table) && is_header_line(s))
1250                 rc = parse_line_header(dp, s);
1251
1252         /* parse script format */
1253         else if (strchr(s, '='))
1254                 rc = parse_line_nameval(dp, s);
1255
1256         /* parse simple <value>, ... format */
1257         else
1258                 rc = parse_line_valcommas(dp, s);
1259
1260         if (rc)
1261                 DBG(SCRIPT, ul_debugobj(dp, "%zu: parse error [rc=%d]",
1262                                 dp->nlines, rc));
1263         return rc;
1264 }
1265
1266 /**
1267  * fdisk_script_set_fgets:
1268  * @dp: script
1269  * @fn_fgets: callback function
1270  *
1271  * The library uses fgets() function to read the next line from the script.
1272  * This default maybe overridden by another function. Note that the function has
1273  * to return the line terminated by \n (for example readline(3) removes \n).
1274  *
1275  * Return: 0 on success, <0 on error
1276  */
1277 int fdisk_script_set_fgets(struct fdisk_script *dp,
1278                           char *(*fn_fgets)(struct fdisk_script *, char *, size_t, FILE *))
1279 {
1280         assert(dp);
1281
1282         dp->fn_fgets = fn_fgets;
1283         return 0;
1284 }
1285
1286 /**
1287  * fdisk_script_read_line:
1288  * @dp: script
1289  * @f: file
1290  * @buf: buffer to store one line of the file
1291  * @bufsz: buffer size
1292  *
1293  * Reads next line into dump.
1294  *
1295  * Returns: 0 on success, <0 on error, 1 when nothing to read. For unknown headers
1296  *          returns -ENOTSUP, it's usually safe to ignore this error.
1297  */
1298 int fdisk_script_read_line(struct fdisk_script *dp, FILE *f, char *buf, size_t bufsz)
1299 {
1300         char *s;
1301
1302         assert(dp);
1303         assert(f);
1304
1305         DBG(SCRIPT, ul_debugobj(dp, " parsing line %zu", dp->nlines));
1306
1307         /* read the next non-blank non-comment line */
1308         do {
1309                 if (dp->fn_fgets) {
1310                         if (dp->fn_fgets(dp, buf, bufsz, f) == NULL)
1311                                 return 1;
1312                 } else if (fgets(buf, bufsz, f) == NULL)
1313                         return 1;
1314
1315                 dp->nlines++;
1316                 s = strchr(buf, '\n');
1317                 if (!s) {
1318                         /* Missing final newline?  Otherwise an extremely */
1319                         /* long line - assume file was corrupted */
1320                         if (feof(f)) {
1321                                 DBG(SCRIPT, ul_debugobj(dp, "no final newline"));
1322                                 s = strchr(buf, '\0');
1323                         } else {
1324                                 DBG(SCRIPT, ul_debugobj(dp,
1325                                         "%zu: missing newline at line", dp->nlines));
1326                                 return -EINVAL;
1327                         }
1328                 }
1329
1330                 *s = '\0';
1331                 if (--s >= buf && *s == '\r')
1332                         *s = '\0';
1333                 s = (char *) skip_blank(buf);
1334         } while (*s == '\0' || *s == '#');
1335
1336         return fdisk_script_read_buffer(dp, s);
1337 }
1338
1339
1340 /**
1341  * fdisk_script_read_file:
1342  * @dp: script
1343  * @f: input file
1344  *
1345  * Reads file @f into script @dp.
1346  *
1347  * Returns: 0 on success, <0 on error.
1348  */
1349 int fdisk_script_read_file(struct fdisk_script *dp, FILE *f)
1350 {
1351         char buf[BUFSIZ];
1352         int rc = 1;
1353
1354         assert(dp);
1355         assert(f);
1356
1357         DBG(SCRIPT, ul_debugobj(dp, "parsing file"));
1358
1359         while (!feof(f)) {
1360                 rc = fdisk_script_read_line(dp, f, buf, sizeof(buf));
1361                 if (rc && rc != -ENOTSUP)
1362                         break;
1363         }
1364
1365         if (rc == 1)
1366                 rc = 0;         /* end of file */
1367
1368         DBG(SCRIPT, ul_debugobj(dp, "parsing file done [rc=%d]", rc));
1369         return rc;
1370 }
1371
1372 /**
1373  * fdisk_set_script:
1374  * @cxt: context
1375  * @dp: script (or NULL to remove previous reference)
1376  *
1377  * Sets reference to the @dp script and remove reference to the previously used
1378  * script.
1379  *
1380  * The script headers might be used by label drivers to overwrite
1381  * built-in defaults (for example disk label Id) and label driver might
1382  * optimize the default semantic to be more usable for scripts (for example to
1383  * not ask for primary/logical/extended partition type).
1384  *
1385  * Note that script also contains reference to the fdisk context (see
1386  * fdisk_new_script()). This context may be completely independent on
1387  * context used for fdisk_set_script().
1388  *
1389  * Don't forget to call fdisk_set_script(cxt, NULL); to remove this reference
1390  * if no more necessary!
1391  *
1392  * Returns: <0 on error, 0 on success.
1393  */
1394 int fdisk_set_script(struct fdisk_context *cxt, struct fdisk_script *dp)
1395 {
1396         assert(cxt);
1397
1398         /* unref old */
1399         if (cxt->script)
1400                 fdisk_unref_script(cxt->script);
1401
1402         /* ref new */
1403         cxt->script = dp;
1404         if (cxt->script) {
1405                 DBG(CXT, ul_debugobj(cxt, "setting reference to script %p", cxt->script));
1406                 fdisk_ref_script(cxt->script);
1407         }
1408
1409         return 0;
1410 }
1411
1412 /**
1413  * fdisk_get_script:
1414  * @cxt: context
1415  *
1416  * Returns: the current script or NULL.
1417  */
1418 struct fdisk_script *fdisk_get_script(struct fdisk_context *cxt)
1419 {
1420         assert(cxt);
1421         return cxt->script;
1422 }
1423
1424 /**
1425  * fdisk_apply_script_headers:
1426  * @cxt: context
1427  * @dp: script
1428  *
1429  * Associate context @cxt with script @dp and creates a new empty disklabel.
1430  * The script may be later unreference by fdisk_set_script() with NULL as script.
1431  *
1432  * Returns: 0 on success, <0 on error.
1433  */
1434 int fdisk_apply_script_headers(struct fdisk_context *cxt, struct fdisk_script *dp)
1435 {
1436         const char *name;
1437         const char *str;
1438         int rc;
1439
1440         assert(cxt);
1441         assert(dp);
1442
1443         DBG(SCRIPT, ul_debugobj(dp, "applying script headers"));
1444         fdisk_set_script(cxt, dp);
1445
1446         str = fdisk_script_get_header(dp, "grain");
1447         if (str) {
1448                 uintmax_t sz;
1449
1450                 rc = parse_size(str, &sz, NULL);
1451                 if (rc == 0)
1452                         rc = fdisk_save_user_grain(cxt, sz);
1453                 if (rc)
1454                         return rc;
1455         }
1456
1457         if (fdisk_has_user_device_properties(cxt))
1458                 fdisk_apply_user_device_properties(cxt);
1459
1460         /* create empty label */
1461         name = fdisk_script_get_header(dp, "label");
1462         if (!name)
1463                 return -EINVAL;
1464
1465         rc = fdisk_create_disklabel(cxt, name);
1466         if (rc)
1467                 return rc;
1468
1469         str = fdisk_script_get_header(dp, "table-length");
1470         if (str) {
1471                 uintmax_t sz;
1472
1473                 rc = parse_size(str, &sz, NULL);
1474                 if (rc == 0)
1475                         rc = fdisk_gpt_set_npartitions(cxt, sz);
1476         }
1477
1478         return rc;
1479 }
1480
1481 /**
1482  * fdisk_apply_script:
1483  * @cxt: context
1484  * @dp: script
1485  *
1486  * This function creates a new disklabel and partition within context @cxt. You
1487  * have to call fdisk_write_disklabel() to apply changes to the device.
1488  *
1489  * Returns: 0 on error, <0 on error.
1490  */
1491 int fdisk_apply_script(struct fdisk_context *cxt, struct fdisk_script *dp)
1492 {
1493         int rc;
1494         struct fdisk_script *old;
1495
1496         assert(dp);
1497         assert(cxt);
1498
1499         DBG(CXT, ul_debugobj(cxt, "applying script %p", dp));
1500
1501         old = fdisk_get_script(cxt);
1502         fdisk_ref_script(old);
1503
1504         /* create empty disk label */
1505         rc = fdisk_apply_script_headers(cxt, dp);
1506
1507         /* create partitions */
1508         if (!rc && dp->table)
1509                 rc = fdisk_apply_table(cxt, dp->table);
1510
1511         fdisk_set_script(cxt, old);
1512         fdisk_unref_script(old);
1513
1514         DBG(CXT, ul_debugobj(cxt, "script done [rc=%d]", rc));
1515         return rc;
1516 }
1517
1518 #ifdef TEST_PROGRAM
1519 static int test_dump(struct fdisk_test *ts, int argc, char *argv[])
1520 {
1521         char *devname = argv[1];
1522         struct fdisk_context *cxt;
1523         struct fdisk_script *dp;
1524
1525         cxt = fdisk_new_context();
1526         fdisk_assign_device(cxt, devname, 1);
1527
1528         dp = fdisk_new_script(cxt);
1529         fdisk_script_read_context(dp, NULL);
1530
1531         fdisk_script_write_file(dp, stdout);
1532         fdisk_unref_script(dp);
1533         fdisk_unref_context(cxt);
1534
1535         return 0;
1536 }
1537
1538 static int test_read(struct fdisk_test *ts, int argc, char *argv[])
1539 {
1540         char *filename = argv[1];
1541         struct fdisk_script *dp;
1542         struct fdisk_context *cxt;
1543         FILE *f;
1544
1545         if (!(f = fopen(filename, "r")))
1546                 err(EXIT_FAILURE, "%s: cannot open", filename);
1547
1548         cxt = fdisk_new_context();
1549         dp = fdisk_new_script(cxt);
1550
1551         fdisk_script_read_file(dp, f);
1552         fclose(f);
1553
1554         fdisk_script_write_file(dp, stdout);
1555         fdisk_unref_script(dp);
1556         fdisk_unref_context(cxt);
1557
1558         return 0;
1559 }
1560
1561 static int test_stdin(struct fdisk_test *ts, int argc, char *argv[])
1562 {
1563         char buf[BUFSIZ];
1564         struct fdisk_script *dp;
1565         struct fdisk_context *cxt;
1566         int rc = 0;
1567
1568         cxt = fdisk_new_context();
1569         dp = fdisk_new_script(cxt);
1570         fdisk_script_set_header(dp, "label", "dos");
1571
1572         printf("<start>, <size>, <type>, <bootable: *|->\n");
1573         do {
1574                 struct fdisk_partition *pa;
1575                 size_t n = dp->table ? fdisk_table_get_nents(dp->table) : 0;
1576
1577                 printf(" #%zu :\n", n + 1);
1578                 rc = fdisk_script_read_line(dp, stdin, buf, sizeof(buf));
1579
1580                 if (rc == 0) {
1581                         pa = fdisk_table_get_partition(dp->table, n);
1582                         printf(" #%zu  %12ju %12ju\n",  n + 1,
1583                                                 (uintmax_t)fdisk_partition_get_start(pa),
1584                                                 (uintmax_t)fdisk_partition_get_size(pa));
1585                 }
1586         } while (rc == 0);
1587
1588         if (!rc)
1589                 fdisk_script_write_file(dp, stdout);
1590         fdisk_unref_script(dp);
1591         fdisk_unref_context(cxt);
1592
1593         return rc;
1594 }
1595
1596 static int test_apply(struct fdisk_test *ts, int argc, char *argv[])
1597 {
1598         char *devname = argv[1], *scriptname = argv[2];
1599         struct fdisk_context *cxt;
1600         struct fdisk_script *dp;
1601         struct fdisk_table *tb = NULL;
1602         struct fdisk_iter *itr = NULL;
1603         struct fdisk_partition *pa = NULL;
1604         int rc;
1605
1606         cxt = fdisk_new_context();
1607         fdisk_assign_device(cxt, devname, 0);
1608
1609         dp = fdisk_new_script_from_file(cxt, scriptname);
1610         if (!dp)
1611                 return -errno;
1612
1613         rc = fdisk_apply_script(cxt, dp);
1614         if (rc)
1615                 goto done;
1616         fdisk_unref_script(dp);
1617
1618         /* list result */
1619         fdisk_list_disklabel(cxt);
1620         fdisk_get_partitions(cxt, &tb);
1621
1622         itr = fdisk_new_iter(FDISK_ITER_FORWARD);
1623         while (fdisk_table_next_partition(tb, itr, &pa) == 0) {
1624                 printf(" #%zu  %12ju %12ju\n",  fdisk_partition_get_partno(pa),
1625                                                 (uintmax_t)fdisk_partition_get_start(pa),
1626                                                 (uintmax_t)fdisk_partition_get_size(pa));
1627         }
1628
1629 done:
1630         fdisk_free_iter(itr);
1631         fdisk_unref_table(tb);
1632
1633         /*fdisk_write_disklabel(cxt);*/
1634         fdisk_unref_context(cxt);
1635         return 0;
1636 }
1637
1638 static int test_tokens(struct fdisk_test *ts, int argc, char *argv[])
1639 {
1640         char *p, *str = argc == 2 ? strdup(argv[1]) : NULL;
1641         int i;
1642
1643         for (i = 1, p = str; p && *p; i++) {
1644                 char *tk = next_token(&p);
1645
1646                 if (!tk)
1647                         break;
1648
1649                 printf("#%d: '%s'\n", i, tk);
1650         }
1651
1652         free(str);
1653         return 0;
1654 }
1655
1656 int main(int argc, char *argv[])
1657 {
1658         struct fdisk_test tss[] = {
1659         { "--dump",    test_dump,    "<device>            dump PT as script" },
1660         { "--read",    test_read,    "<file>              read PT script from file" },
1661         { "--apply",   test_apply,   "<device> <file>     try apply script from file to device" },
1662         { "--stdin",   test_stdin,   "                    read input like sfdisk" },
1663         { "--tokens",  test_tokens,  "<string>            parse string" },
1664         { NULL }
1665         };
1666
1667         return fdisk_run_test(tss, argc, argv);
1668 }
1669
1670 #endif