commit-tree.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 #include <pwd.h>
   9 #include <time.h>
  10 #include <string.h>
  11 #include <ctype.h>
  12 #include <time.h>
  13
  14 #define BLOCKING (1ul << 14)
  15 #define ORIG_OFFSET (40)
  16
  17 /*
  18  * Leave space at the beginning to insert the tag
  19  * once we know how big things are.
  20  *
  21  * FIXME! Share the code with "write-tree.c"
  22  */
  23 static void init_buffer(char **bufp, unsigned int *sizep)
  24 {
  25         char *buf = malloc(BLOCKING);
  26         memset(buf, 0, ORIG_OFFSET);
  27         *sizep = ORIG_OFFSET;
  28         *bufp = buf;
  29 }
  30
  31 static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
  32 {
  33         char one_line[2048];
  34         va_list args;
  35         int len;
  36         unsigned long alloc, size, newsize;
  37         char *buf;
  38
  39         va_start(args, fmt);
  40         len = vsnprintf(one_line, sizeof(one_line), fmt, args);
  41         va_end(args);
  42         size = *sizep;
  43         newsize = size + len;
  44         alloc = (size + 32767) & ~32767;
  45         buf = *bufp;
  46         if (newsize > alloc) {
  47                 alloc = (newsize + 32767) & ~32767;
  48                 buf = realloc(buf, alloc);
  49                 *bufp = buf;
  50         }
  51         *sizep = newsize;
  52         memcpy(buf + size, one_line, len);
  53 }
  54
  55 static int prepend_integer(char *buffer, unsigned val, int i)
  56 {
  57         buffer[--i] = '\0';
  58         do {
  59                 buffer[--i] = '0' + (val % 10);
  60                 val /= 10;
  61         } while (val);
  62         return i;
  63 }
  64
  65 static void finish_buffer(char *tag, char **bufp, unsigned int *sizep)
  66 {
  67         int taglen;
  68         int offset;
  69         char *buf = *bufp;
  70         unsigned int size = *sizep;
  71
  72         offset = prepend_integer(buf, size - ORIG_OFFSET, ORIG_OFFSET);
  73         taglen = strlen(tag);
  74         offset -= taglen;
  75         buf += offset;
  76         size -= offset;
  77         memcpy(buf, tag, taglen);
  78
  79         *bufp = buf;
  80         *sizep = size;
  81 }
  82
  83 static void remove_special(char *p)
  84 {
  85         char c;
  86         char *dst = p;
  87
  88         for (;;) {
  89                 c = *p;
  90                 p++;
  91                 switch(c) {
  92                 case '\n': case '<': case '>':
  93                         continue;
  94                 }
  95                 *dst++ = c;
  96                 if (!c)
  97                         break;
  98         }
  99 }
 100
 101 static const char *month_names[] = {
 102         "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 103         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 104 };
 105
 106 static const char *weekday_names[] = {
 107         "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
 108 };
 109
 110
 111 static char *skipfws(char *str)
 112 {
 113         while (isspace(*str))
 114                 str++;
 115         return str;
 116 }
 117
 118
 119 /* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
 120    (i.e. English) day/month names, and it doesn't work correctly with %z. */
 121 static void parse_rfc2822_date(char *date, char *result, int maxlen)
 122 {
 123         struct tm tm;
 124         char *p;
 125         int i, offset;
 126         time_t then;
 127
 128         memset(&tm, 0, sizeof(tm));
 129
 130         /* Skip day-name */
 131         p = skipfws(date);
 132         if (!isdigit(*p)) {
 133                 for (i=0; i<7; i++) {
 134                         if (!strncmp(p,weekday_names[i],3) && p[3] == ',') {
 135                                 p = skipfws(p+4);
 136                                 goto day;
 137                         }
 138                 }
 139                 return;
 140         }
 141
 142         /* day */
 143  day:
 144         tm.tm_mday = strtoul(p, &p, 10);
 145
 146         if (tm.tm_mday < 1 || tm.tm_mday > 31)
 147                 return;
 148
 149         if (!isspace(*p))
 150                 return;
 151
 152         p = skipfws(p);
 153
 154         /* month */
 155
 156         for (i=0; i<12; i++) {
 157                 if (!strncmp(p, month_names[i], 3) && isspace(p[3])) {
 158                         tm.tm_mon = i;
 159                         p = skipfws(p+strlen(month_names[i]));
 160                         goto year;
 161                 }
 162         }
 163         return; /* Error -- bad month */
 164
 165         /* year */
 166  year:
 167         tm.tm_year = strtoul(p, &p, 10);
 168
 169         if (!tm.tm_year && !isspace(*p))
 170                 return;
 171
 172         if (tm.tm_year > 1900)
 173                 tm.tm_year -= 1900;
 174
 175         p=skipfws(p);
 176
 177         /* hour */
 178         if (!isdigit(*p))
 179                 return;
 180         tm.tm_hour = strtoul(p, &p, 10);
 181
 182         if (!tm.tm_hour > 23)
 183                 return;
 184
 185         if (*p != ':')
 186                 return; /* Error -- bad time */
 187         p++;
 188
 189         /* minute */
 190         if (!isdigit(*p))
 191                 return;
 192         tm.tm_min = strtoul(p, &p, 10);
 193
 194         if (!tm.tm_min > 59)
 195                 return;
 196
 197         if (isspace(*p))
 198                 goto zone;
 199
 200         if (*p != ':')
 201                 return; /* Error -- bad time */
 202         p++;
 203
 204         /* second */
 205         if (!isdigit(*p))
 206                 return;
 207         tm.tm_sec = strtoul(p, &p, 10);
 208
 209         if (!tm.tm_sec > 59)
 210                 return;
 211
 212         if (!isspace(*p))
 213                 return;
 214
 215  zone:
 216         p = skipfws(p);
 217
 218         if (*p == '-')
 219                 offset = -60;
 220         else if (*p == '+')
 221                 offset = 60;
 222         else
 223                return;
 224
 225         if (!isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3]) || !isdigit(p[4]))
 226                 return;
 227
 228         i = strtoul(p+1, NULL, 10);
 229         offset *= ((i % 100) + ((i / 100) * 60));
 230
 231         if (*(skipfws(p + 5)))
 232                 return;
 233
 234         then = mktime(&tm); /* mktime appears to ignore the GMT offset, stupidly */
 235         if (then == -1)
 236                 return;
 237
 238         then -= offset;
 239
 240         snprintf(result, maxlen, "%lu %5.5s", then, p);
 241 }
 242
 243 static void check_valid(unsigned char *sha1, const char *expect)
 244 {
 245         void *buf;
 246         char type[20];
 247         unsigned long size;
 248
 249         buf = read_sha1_file(sha1, type, &size);
 250         if (!buf || strcmp(type, expect))
 251                 die("%s is not a valid '%s' object", sha1_to_hex(sha1), expect);
 252         free(buf);
 253 }
 254
 255 /*
 256  * Having more than two parents may be strange, but hey, there's
 257  * no conceptual reason why the file format couldn't accept multi-way
 258  * merges. It might be the "union" of several packages, for example.
 259  *
 260  * I don't really expect that to happen, but this is here to make
 261  * it clear that _conceptually_ it's ok..
 262  */
 263 #define MAXPARENT (16)
 264
 265 int main(int argc, char **argv)
 266 {
 267         int i, len;
 268         int parents = 0;
 269         unsigned char tree_sha1[20];
 270         unsigned char parent_sha1[MAXPARENT][20];
 271         unsigned char commit_sha1[20];
 272         char *gecos, *realgecos;
 273         char *email, realemail[1000];
 274         char date[20], realdate[20];
 275         char *audate;
 276         char comment[1000];
 277         struct passwd *pw;
 278         time_t now;
 279         struct tm *tm;
 280         char *buffer;
 281         unsigned int size;
 282
 283         if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
 284                 usage("commit-tree <sha1> [-p <sha1>]* < changelog");
 285
 286         check_valid(tree_sha1, "tree");
 287         for (i = 2; i < argc; i += 2) {
 288                 char *a, *b;
 289                 a = argv[i]; b = argv[i+1];
 290                 if (!b || strcmp(a, "-p") || get_sha1_hex(b, parent_sha1[parents]))
 291                         usage("commit-tree <sha1> [-p <sha1>]* < changelog");
 292                 check_valid(parent_sha1[parents], "commit");
 293                 parents++;
 294         }
 295         if (!parents)
 296                 fprintf(stderr, "Committing initial tree %s\n", argv[1]);
 297         pw = getpwuid(getuid());
 298         if (!pw)
 299                 die("You don't exist. Go away!");
 300         realgecos = pw->pw_gecos;
 301         len = strlen(pw->pw_name);
 302         memcpy(realemail, pw->pw_name, len);
 303         realemail[len] = '@';
 304         gethostname(realemail+len+1, sizeof(realemail)-len-1);
 305         time(&now);
 306         tm = localtime(&now);
 307
 308         strftime(realdate, sizeof(realdate), "%s %z", tm);
 309         strcpy(date, realdate);
 310
 311         gecos = getenv("AUTHOR_NAME") ? : realgecos;
 312         email = getenv("AUTHOR_EMAIL") ? : realemail;
 313         audate = getenv("AUTHOR_DATE");
 314         if (audate)
 315                 parse_rfc2822_date(audate, date, sizeof(date));
 316
 317         remove_special(gecos); remove_special(realgecos);
 318         remove_special(email); remove_special(realemail);
 319
 320         init_buffer(&buffer, &size);
 321         add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
 322
 323         /*
 324          * NOTE! This ordering means that the same exact tree merged with a
 325          * different order of parents will be a _different_ changeset even
 326          * if everything else stays the same.
 327          */
 328         for (i = 0; i < parents; i++)
 329                 add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
 330
 331         /* Person/date information */
 332         add_buffer(&buffer, &size, "author %s <%s> %s\n", gecos, email, date);
 333         add_buffer(&buffer, &size, "committer %s <%s> %s\n\n", realgecos, realemail, realdate);
 334
 335         /* And add the comment */
 336         while (fgets(comment, sizeof(comment), stdin) != NULL)
 337                 add_buffer(&buffer, &size, "%s", comment);
 338
 339         finish_buffer("commit ", &buffer, &size);
 340
 341         write_sha1_file(buffer, size, commit_sha1);
 342         printf("%s\n", sha1_to_hex(commit_sha1));
 343         return 0;
 344 }