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Commit | Line | Data |
---|---|---|
66bf85a4 LT |
1 | #include "cache.h" |
2 | #include "refs.h" | |
854b4629 | 3 | #include "builtin.h" |
89942be6 | 4 | #include "parse-options.h" |
c750ba95 BK |
5 | #include "quote.h" |
6 | #include "argv-array.h" | |
66bf85a4 | 7 | |
89942be6 | 8 | static const char * const git_update_ref_usage[] = { |
82269505 NTND |
9 | N_("git update-ref [options] -d <refname> [<oldval>]"), |
10 | N_("git update-ref [options] <refname> <newval> [<oldval>]"), | |
c750ba95 | 11 | N_("git update-ref [options] --stdin [-z]"), |
89942be6 PH |
12 | NULL |
13 | }; | |
152da3df | 14 | |
aebfc133 | 15 | static struct ref_transaction *transaction; |
c750ba95 BK |
16 | |
17 | static char line_termination = '\n'; | |
18 | static int update_flags; | |
8e34800e | 19 | static struct strbuf err = STRBUF_INIT; |
c750ba95 | 20 | |
697a4151 MH |
21 | /* |
22 | * Parse one whitespace- or NUL-terminated, possibly C-quoted argument | |
23 | * and append the result to arg. Return a pointer to the terminator. | |
24 | * Die if there is an error in how the argument is C-quoted. This | |
25 | * function is only used if not -z. | |
26 | */ | |
c750ba95 BK |
27 | static const char *parse_arg(const char *next, struct strbuf *arg) |
28 | { | |
697a4151 MH |
29 | if (*next == '"') { |
30 | const char *orig = next; | |
31 | ||
32 | if (unquote_c_style(arg, next, &next)) | |
33 | die("badly quoted argument: %s", orig); | |
34 | if (*next && !isspace(*next)) | |
35 | die("unexpected character after quoted argument: %s", orig); | |
36 | } else { | |
c750ba95 BK |
37 | while (*next && !isspace(*next)) |
38 | strbuf_addch(arg, *next++); | |
697a4151 | 39 | } |
c750ba95 | 40 | |
c750ba95 BK |
41 | return next; |
42 | } | |
43 | ||
e23d8435 | 44 | /* |
ed410e61 MH |
45 | * Parse the reference name immediately after "command SP". If not |
46 | * -z, then handle C-quoting. Return a pointer to a newly allocated | |
47 | * string containing the name of the reference, or NULL if there was | |
48 | * an error. Update *next to point at the character that terminates | |
49 | * the argument. Die if C-quoting is malformed or the reference name | |
50 | * is invalid. | |
e23d8435 | 51 | */ |
ed410e61 | 52 | static char *parse_refname(struct strbuf *input, const char **next) |
c750ba95 | 53 | { |
ed410e61 MH |
54 | struct strbuf ref = STRBUF_INIT; |
55 | ||
c750ba95 BK |
56 | if (line_termination) { |
57 | /* Without -z, use the next argument */ | |
ed410e61 | 58 | *next = parse_arg(*next, &ref); |
c750ba95 | 59 | } else { |
e23d8435 | 60 | /* With -z, use everything up to the next NUL */ |
ed410e61 MH |
61 | strbuf_addstr(&ref, *next); |
62 | *next += ref.len; | |
63 | } | |
64 | ||
65 | if (!ref.len) { | |
66 | strbuf_release(&ref); | |
67 | return NULL; | |
c750ba95 | 68 | } |
ed410e61 MH |
69 | |
70 | if (check_refname_format(ref.buf, REFNAME_ALLOW_ONELEVEL)) | |
71 | die("invalid ref format: %s", ref.buf); | |
72 | ||
73 | return strbuf_detach(&ref, NULL); | |
c750ba95 BK |
74 | } |
75 | ||
e23d8435 | 76 | /* |
3afcc463 MH |
77 | * The value being parsed is <oldvalue> (as opposed to <newvalue>; the |
78 | * difference affects which error messages are generated): | |
79 | */ | |
80 | #define PARSE_SHA1_OLD 0x01 | |
81 | ||
82 | /* | |
83 | * For backwards compatibility, accept an empty string for update's | |
84 | * <newvalue> in binary mode to be equivalent to specifying zeros. | |
85 | */ | |
86 | #define PARSE_SHA1_ALLOW_EMPTY 0x02 | |
87 | ||
88 | /* | |
89 | * Parse an argument separator followed by the next argument, if any. | |
90 | * If there is an argument, convert it to a SHA-1, write it to sha1, | |
91 | * set *next to point at the character terminating the argument, and | |
e23d8435 | 92 | * return 0. If there is no argument at all (not even the empty |
3afcc463 MH |
93 | * string), return 1 and leave *next unchanged. If the value is |
94 | * provided but cannot be converted to a SHA-1, die. flags can | |
95 | * include PARSE_SHA1_OLD and/or PARSE_SHA1_ALLOW_EMPTY. | |
e23d8435 | 96 | */ |
3afcc463 MH |
97 | static int parse_next_sha1(struct strbuf *input, const char **next, |
98 | unsigned char *sha1, | |
99 | const char *command, const char *refname, | |
100 | int flags) | |
c750ba95 | 101 | { |
3afcc463 MH |
102 | struct strbuf arg = STRBUF_INIT; |
103 | int ret = 0; | |
104 | ||
105 | if (*next == input->buf + input->len) | |
106 | goto eof; | |
107 | ||
c750ba95 BK |
108 | if (line_termination) { |
109 | /* Without -z, consume SP and use next argument */ | |
e23d8435 | 110 | if (!**next || **next == line_termination) |
3afcc463 | 111 | return 1; |
e23d8435 | 112 | if (**next != ' ') |
3afcc463 MH |
113 | die("%s %s: expected SP but got: %s", |
114 | command, refname, *next); | |
e23d8435 | 115 | (*next)++; |
3afcc463 MH |
116 | *next = parse_arg(*next, &arg); |
117 | if (arg.len) { | |
118 | if (get_sha1(arg.buf, sha1)) | |
119 | goto invalid; | |
120 | } else { | |
121 | /* Without -z, an empty value means all zeros: */ | |
122 | hashclr(sha1); | |
123 | } | |
c750ba95 BK |
124 | } else { |
125 | /* With -z, read the next NUL-terminated line */ | |
e23d8435 | 126 | if (**next) |
3afcc463 MH |
127 | die("%s %s: expected NUL but got: %s", |
128 | command, refname, *next); | |
e23d8435 MH |
129 | (*next)++; |
130 | if (*next == input->buf + input->len) | |
3afcc463 MH |
131 | goto eof; |
132 | strbuf_addstr(&arg, *next); | |
133 | *next += arg.len; | |
134 | ||
135 | if (arg.len) { | |
136 | if (get_sha1(arg.buf, sha1)) | |
137 | goto invalid; | |
138 | } else if (flags & PARSE_SHA1_ALLOW_EMPTY) { | |
139 | /* With -z, treat an empty value as all zeros: */ | |
1fbd5049 MH |
140 | warning("%s %s: missing <newvalue>, treating as zero", |
141 | command, refname); | |
3afcc463 MH |
142 | hashclr(sha1); |
143 | } else { | |
144 | /* | |
145 | * With -z, an empty non-required value means | |
146 | * unspecified: | |
147 | */ | |
148 | ret = 1; | |
149 | } | |
c750ba95 | 150 | } |
3afcc463 MH |
151 | |
152 | strbuf_release(&arg); | |
153 | ||
154 | return ret; | |
155 | ||
156 | invalid: | |
157 | die(flags & PARSE_SHA1_OLD ? | |
158 | "%s %s: invalid <oldvalue>: %s" : | |
159 | "%s %s: invalid <newvalue>: %s", | |
160 | command, refname, arg.buf); | |
161 | ||
162 | eof: | |
163 | die(flags & PARSE_SHA1_OLD ? | |
726f6916 MH |
164 | "%s %s: unexpected end of input when reading <oldvalue>" : |
165 | "%s %s: unexpected end of input when reading <newvalue>", | |
3afcc463 | 166 | command, refname); |
c750ba95 BK |
167 | } |
168 | ||
e23d8435 MH |
169 | |
170 | /* | |
171 | * The following five parse_cmd_*() functions parse the corresponding | |
172 | * command. In each case, next points at the character following the | |
173 | * command name and the following space. They each return a pointer | |
174 | * to the character terminating the command, and die with an | |
175 | * explanatory message if there are any parsing problems. All of | |
176 | * these functions handle either text or binary format input, | |
177 | * depending on how line_termination is set. | |
178 | */ | |
179 | ||
180 | static const char *parse_cmd_update(struct strbuf *input, const char *next) | |
c750ba95 | 181 | { |
aebfc133 MH |
182 | char *refname; |
183 | unsigned char new_sha1[20]; | |
184 | unsigned char old_sha1[20]; | |
185 | int have_old; | |
c750ba95 | 186 | |
aebfc133 MH |
187 | refname = parse_refname(input, &next); |
188 | if (!refname) | |
f11b09fb | 189 | die("update: missing <ref>"); |
c750ba95 | 190 | |
aebfc133 | 191 | if (parse_next_sha1(input, &next, new_sha1, "update", refname, |
3afcc463 | 192 | PARSE_SHA1_ALLOW_EMPTY)) |
aebfc133 | 193 | die("update %s: missing <newvalue>", refname); |
c750ba95 | 194 | |
aebfc133 MH |
195 | have_old = !parse_next_sha1(input, &next, old_sha1, "update", refname, |
196 | PARSE_SHA1_OLD); | |
3afcc463 MH |
197 | |
198 | if (*next != line_termination) | |
aebfc133 MH |
199 | die("update %s: extra input: %s", refname, next); |
200 | ||
8e34800e RS |
201 | if (ref_transaction_update(transaction, refname, new_sha1, old_sha1, |
202 | update_flags, have_old, &err)) | |
203 | die("%s", err.buf); | |
aebfc133 MH |
204 | |
205 | update_flags = 0; | |
206 | free(refname); | |
c750ba95 | 207 | |
e23d8435 | 208 | return next; |
c750ba95 BK |
209 | } |
210 | ||
e23d8435 | 211 | static const char *parse_cmd_create(struct strbuf *input, const char *next) |
c750ba95 | 212 | { |
aebfc133 MH |
213 | char *refname; |
214 | unsigned char new_sha1[20]; | |
c750ba95 | 215 | |
aebfc133 MH |
216 | refname = parse_refname(input, &next); |
217 | if (!refname) | |
f11b09fb | 218 | die("create: missing <ref>"); |
c750ba95 | 219 | |
aebfc133 MH |
220 | if (parse_next_sha1(input, &next, new_sha1, "create", refname, 0)) |
221 | die("create %s: missing <newvalue>", refname); | |
e23d8435 | 222 | |
aebfc133 MH |
223 | if (is_null_sha1(new_sha1)) |
224 | die("create %s: zero <newvalue>", refname); | |
c750ba95 | 225 | |
e23d8435 | 226 | if (*next != line_termination) |
aebfc133 MH |
227 | die("create %s: extra input: %s", refname, next); |
228 | ||
b416af5b RS |
229 | if (ref_transaction_create(transaction, refname, new_sha1, |
230 | update_flags, &err)) | |
231 | die("%s", err.buf); | |
aebfc133 MH |
232 | |
233 | update_flags = 0; | |
234 | free(refname); | |
e23d8435 MH |
235 | |
236 | return next; | |
c750ba95 BK |
237 | } |
238 | ||
e23d8435 | 239 | static const char *parse_cmd_delete(struct strbuf *input, const char *next) |
c750ba95 | 240 | { |
aebfc133 MH |
241 | char *refname; |
242 | unsigned char old_sha1[20]; | |
243 | int have_old; | |
c750ba95 | 244 | |
aebfc133 MH |
245 | refname = parse_refname(input, &next); |
246 | if (!refname) | |
f11b09fb | 247 | die("delete: missing <ref>"); |
c750ba95 | 248 | |
aebfc133 MH |
249 | if (parse_next_sha1(input, &next, old_sha1, "delete", refname, |
250 | PARSE_SHA1_OLD)) { | |
251 | have_old = 0; | |
3afcc463 | 252 | } else { |
aebfc133 MH |
253 | if (is_null_sha1(old_sha1)) |
254 | die("delete %s: zero <oldvalue>", refname); | |
255 | have_old = 1; | |
3afcc463 | 256 | } |
c750ba95 | 257 | |
e23d8435 | 258 | if (*next != line_termination) |
aebfc133 MH |
259 | die("delete %s: extra input: %s", refname, next); |
260 | ||
8c8bdc0d RS |
261 | if (ref_transaction_delete(transaction, refname, old_sha1, |
262 | update_flags, have_old, &err)) | |
263 | die("%s", err.buf); | |
aebfc133 MH |
264 | |
265 | update_flags = 0; | |
266 | free(refname); | |
e23d8435 MH |
267 | |
268 | return next; | |
c750ba95 BK |
269 | } |
270 | ||
e23d8435 | 271 | static const char *parse_cmd_verify(struct strbuf *input, const char *next) |
c750ba95 | 272 | { |
aebfc133 MH |
273 | char *refname; |
274 | unsigned char new_sha1[20]; | |
275 | unsigned char old_sha1[20]; | |
276 | int have_old; | |
c750ba95 | 277 | |
aebfc133 MH |
278 | refname = parse_refname(input, &next); |
279 | if (!refname) | |
f11b09fb | 280 | die("verify: missing <ref>"); |
c750ba95 | 281 | |
aebfc133 MH |
282 | if (parse_next_sha1(input, &next, old_sha1, "verify", refname, |
283 | PARSE_SHA1_OLD)) { | |
284 | hashclr(new_sha1); | |
285 | have_old = 0; | |
3afcc463 | 286 | } else { |
aebfc133 MH |
287 | hashcpy(new_sha1, old_sha1); |
288 | have_old = 1; | |
3afcc463 | 289 | } |
c750ba95 | 290 | |
e23d8435 | 291 | if (*next != line_termination) |
aebfc133 MH |
292 | die("verify %s: extra input: %s", refname, next); |
293 | ||
8e34800e RS |
294 | if (ref_transaction_update(transaction, refname, new_sha1, old_sha1, |
295 | update_flags, have_old, &err)) | |
296 | die("%s", err.buf); | |
aebfc133 MH |
297 | |
298 | update_flags = 0; | |
299 | free(refname); | |
e23d8435 MH |
300 | |
301 | return next; | |
c750ba95 BK |
302 | } |
303 | ||
e23d8435 | 304 | static const char *parse_cmd_option(struct strbuf *input, const char *next) |
c750ba95 | 305 | { |
e23d8435 | 306 | if (!strncmp(next, "no-deref", 8) && next[8] == line_termination) |
c750ba95 BK |
307 | update_flags |= REF_NODEREF; |
308 | else | |
309 | die("option unknown: %s", next); | |
e23d8435 | 310 | return next + 8; |
c750ba95 BK |
311 | } |
312 | ||
313 | static void update_refs_stdin(void) | |
314 | { | |
e23d8435 MH |
315 | struct strbuf input = STRBUF_INIT; |
316 | const char *next; | |
c750ba95 | 317 | |
e23d8435 MH |
318 | if (strbuf_read(&input, 0, 1000) < 0) |
319 | die_errno("could not read from stdin"); | |
320 | next = input.buf; | |
c750ba95 | 321 | /* Read each line dispatch its command */ |
e23d8435 MH |
322 | while (next < input.buf + input.len) { |
323 | if (*next == line_termination) | |
c750ba95 | 324 | die("empty command in input"); |
e23d8435 MH |
325 | else if (isspace(*next)) |
326 | die("whitespace before command: %s", next); | |
327 | else if (starts_with(next, "update ")) | |
328 | next = parse_cmd_update(&input, next + 7); | |
329 | else if (starts_with(next, "create ")) | |
330 | next = parse_cmd_create(&input, next + 7); | |
331 | else if (starts_with(next, "delete ")) | |
332 | next = parse_cmd_delete(&input, next + 7); | |
333 | else if (starts_with(next, "verify ")) | |
334 | next = parse_cmd_verify(&input, next + 7); | |
335 | else if (starts_with(next, "option ")) | |
336 | next = parse_cmd_option(&input, next + 7); | |
c750ba95 | 337 | else |
e23d8435 MH |
338 | die("unknown command: %s", next); |
339 | ||
340 | next++; | |
341 | } | |
c750ba95 | 342 | |
e23d8435 | 343 | strbuf_release(&input); |
c750ba95 BK |
344 | } |
345 | ||
a633fca0 | 346 | int cmd_update_ref(int argc, const char **argv, const char *prefix) |
66bf85a4 | 347 | { |
f877fd82 | 348 | const char *refname, *oldval, *msg = NULL; |
5b16b090 | 349 | unsigned char sha1[20], oldsha1[20]; |
c750ba95 | 350 | int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0; |
89942be6 | 351 | struct option options[] = { |
82269505 | 352 | OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")), |
d5d09d47 SB |
353 | OPT_BOOL('d', NULL, &delete, N_("delete the reference")), |
354 | OPT_BOOL( 0 , "no-deref", &no_deref, | |
82269505 | 355 | N_("update <refname> not the one it points to")), |
9a86b899 JH |
356 | OPT_BOOL('z', NULL, &end_null, N_("stdin has NUL-terminated arguments")), |
357 | OPT_BOOL( 0 , "stdin", &read_stdin, N_("read updates from stdin")), | |
89942be6 PH |
358 | OPT_END(), |
359 | }; | |
66bf85a4 | 360 | |
ef90d6d4 | 361 | git_config(git_default_config, NULL); |
37782920 SB |
362 | argc = parse_options(argc, argv, prefix, options, git_update_ref_usage, |
363 | 0); | |
89942be6 PH |
364 | if (msg && !*msg) |
365 | die("Refusing to perform update with empty message."); | |
5b16b090 | 366 | |
c750ba95 | 367 | if (read_stdin) { |
93a644ea RS |
368 | transaction = ref_transaction_begin(&err); |
369 | if (!transaction) | |
370 | die("%s", err.buf); | |
c750ba95 BK |
371 | if (delete || no_deref || argc > 0) |
372 | usage_with_options(git_update_ref_usage, options); | |
373 | if (end_null) | |
374 | line_termination = '\0'; | |
375 | update_refs_stdin(); | |
01319837 | 376 | if (ref_transaction_commit(transaction, msg, &err)) |
8bcd3748 | 377 | die("%s", err.buf); |
33f9fc59 | 378 | ref_transaction_free(transaction); |
93a644ea | 379 | strbuf_release(&err); |
8bcd3748 | 380 | return 0; |
c750ba95 BK |
381 | } |
382 | ||
383 | if (end_null) | |
384 | usage_with_options(git_update_ref_usage, options); | |
385 | ||
ac5409e4 | 386 | if (delete) { |
3fe8dce6 | 387 | if (argc < 1 || argc > 2) |
973a70ea KW |
388 | usage_with_options(git_update_ref_usage, options); |
389 | refname = argv[0]; | |
390 | oldval = argv[1]; | |
391 | } else { | |
392 | const char *value; | |
393 | if (argc < 2 || argc > 3) | |
89942be6 | 394 | usage_with_options(git_update_ref_usage, options); |
973a70ea KW |
395 | refname = argv[0]; |
396 | value = argv[1]; | |
397 | oldval = argv[2]; | |
398 | if (get_sha1(value, sha1)) | |
399 | die("%s: not a valid SHA1", value); | |
ac5409e4 JH |
400 | } |
401 | ||
973a70ea | 402 | hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */ |
ac5409e4 | 403 | if (oldval && *oldval && get_sha1(oldval, oldsha1)) |
66bf85a4 LT |
404 | die("%s: not a valid old SHA1", oldval); |
405 | ||
569740bd MV |
406 | if (no_deref) |
407 | flags = REF_NODEREF; | |
973a70ea | 408 | if (delete) |
569740bd | 409 | return delete_ref(refname, oldval ? oldsha1 : NULL, flags); |
973a70ea KW |
410 | else |
411 | return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL, | |
f4124112 | 412 | flags, UPDATE_REFS_DIE_ON_ERR); |
66bf85a4 | 413 | } |