| 1 | #define USE_THE_REPOSITORY_VARIABLE |
| 2 | #define DISABLE_SIGN_COMPARE_WARNINGS |
| 3 | |
| 4 | #include "builtin.h" |
| 5 | #include "config.h" |
| 6 | #include "environment.h" |
| 7 | #include "gettext.h" |
| 8 | #include "hash.h" |
| 9 | #include "hex.h" |
| 10 | #include "refs.h" |
| 11 | #include "object-name.h" |
| 12 | #include "parse-options.h" |
| 13 | #include "quote.h" |
| 14 | |
| 15 | static const char * const git_update_ref_usage[] = { |
| 16 | N_("git update-ref [<options>] -d <refname> [<old-oid>]"), |
| 17 | N_("git update-ref [<options>] <refname> <new-oid> [<old-oid>]"), |
| 18 | N_("git update-ref [<options>] --stdin [-z] [--batch-updates]"), |
| 19 | NULL |
| 20 | }; |
| 21 | |
| 22 | static char line_termination = '\n'; |
| 23 | static unsigned int update_flags; |
| 24 | static unsigned int default_flags; |
| 25 | static unsigned create_reflog_flag; |
| 26 | static const char *msg; |
| 27 | |
| 28 | struct command_options { |
| 29 | /* |
| 30 | * Individual updates are allowed to fail without causing |
| 31 | * update-ref to exit. This is set when using the |
| 32 | * '--batch-updates' flag. |
| 33 | */ |
| 34 | bool allow_update_failures; |
| 35 | }; |
| 36 | |
| 37 | /* |
| 38 | * Parse one whitespace- or NUL-terminated, possibly C-quoted argument |
| 39 | * and append the result to arg. Return a pointer to the terminator. |
| 40 | * Die if there is an error in how the argument is C-quoted. This |
| 41 | * function is only used if not -z. |
| 42 | */ |
| 43 | static const char *parse_arg(const char *next, struct strbuf *arg) |
| 44 | { |
| 45 | if (*next == '"') { |
| 46 | const char *orig = next; |
| 47 | |
| 48 | if (unquote_c_style(arg, next, &next)) |
| 49 | die("badly quoted argument: %s", orig); |
| 50 | if (*next && !isspace(*next)) |
| 51 | die("unexpected character after quoted argument: %s", orig); |
| 52 | } else { |
| 53 | while (*next && !isspace(*next)) |
| 54 | strbuf_addch(arg, *next++); |
| 55 | } |
| 56 | |
| 57 | return next; |
| 58 | } |
| 59 | |
| 60 | /* |
| 61 | * Parse the reference name immediately after "command SP". If not |
| 62 | * -z, then handle C-quoting. Return a pointer to a newly allocated |
| 63 | * string containing the name of the reference, or NULL if there was |
| 64 | * an error. Update *next to point at the character that terminates |
| 65 | * the argument. Die if C-quoting is malformed or the reference name |
| 66 | * is invalid. |
| 67 | */ |
| 68 | static char *parse_refname(const char **next) |
| 69 | { |
| 70 | struct strbuf ref = STRBUF_INIT; |
| 71 | |
| 72 | if (line_termination) { |
| 73 | /* Without -z, use the next argument */ |
| 74 | *next = parse_arg(*next, &ref); |
| 75 | } else { |
| 76 | /* With -z, use everything up to the next NUL */ |
| 77 | strbuf_addstr(&ref, *next); |
| 78 | *next += ref.len; |
| 79 | } |
| 80 | |
| 81 | if (!ref.len) { |
| 82 | strbuf_release(&ref); |
| 83 | return NULL; |
| 84 | } |
| 85 | |
| 86 | if (check_refname_format(ref.buf, REFNAME_ALLOW_ONELEVEL)) |
| 87 | die("invalid ref format: %s", ref.buf); |
| 88 | |
| 89 | return strbuf_detach(&ref, NULL); |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * Wrapper around parse_refname which skips the next delimiter. |
| 94 | */ |
| 95 | static char *parse_next_refname(const char **next) |
| 96 | { |
| 97 | if (line_termination) { |
| 98 | /* Without -z, consume SP and use next argument */ |
| 99 | if (!**next || **next == line_termination) |
| 100 | return NULL; |
| 101 | if (**next != ' ') |
| 102 | die("expected SP but got: %s", *next); |
| 103 | } else { |
| 104 | /* With -z, read the next NUL-terminated line */ |
| 105 | if (**next) |
| 106 | return NULL; |
| 107 | } |
| 108 | /* Skip the delimiter */ |
| 109 | (*next)++; |
| 110 | |
| 111 | return parse_refname(next); |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * Wrapper around parse_arg which skips the next delimiter. |
| 116 | */ |
| 117 | static char *parse_next_arg(const char **next) |
| 118 | { |
| 119 | struct strbuf arg = STRBUF_INIT; |
| 120 | |
| 121 | if (line_termination) { |
| 122 | /* Without -z, consume SP and use next argument */ |
| 123 | if (!**next || **next == line_termination) |
| 124 | return NULL; |
| 125 | if (**next != ' ') |
| 126 | die("expected SP but got: %s", *next); |
| 127 | } else { |
| 128 | /* With -z, read the next NUL-terminated line */ |
| 129 | if (**next) |
| 130 | return NULL; |
| 131 | } |
| 132 | /* Skip the delimiter */ |
| 133 | (*next)++; |
| 134 | |
| 135 | if (line_termination) { |
| 136 | /* Without -z, use the next argument */ |
| 137 | *next = parse_arg(*next, &arg); |
| 138 | } else { |
| 139 | /* With -z, use everything up to the next NUL */ |
| 140 | strbuf_addstr(&arg, *next); |
| 141 | *next += arg.len; |
| 142 | } |
| 143 | |
| 144 | if (arg.len) |
| 145 | return strbuf_detach(&arg, NULL); |
| 146 | |
| 147 | strbuf_release(&arg); |
| 148 | return NULL; |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * The value being parsed is <old-oid> (as opposed to <new-oid>; the |
| 153 | * difference affects which error messages are generated): |
| 154 | */ |
| 155 | #define PARSE_SHA1_OLD 0x01 |
| 156 | |
| 157 | /* |
| 158 | * For backwards compatibility, accept an empty string for update's |
| 159 | * <new-oid> in binary mode to be equivalent to specifying zeros. |
| 160 | */ |
| 161 | #define PARSE_SHA1_ALLOW_EMPTY 0x02 |
| 162 | |
| 163 | /* |
| 164 | * Parse an argument separator followed by the next argument, if any. |
| 165 | * If there is an argument, convert it to a SHA-1, write it to sha1, |
| 166 | * set *next to point at the character terminating the argument, and |
| 167 | * return 0. If there is no argument at all (not even the empty |
| 168 | * string), return 1 and leave *next unchanged. If the value is |
| 169 | * provided but cannot be converted to a SHA-1, die. flags can |
| 170 | * include PARSE_SHA1_OLD and/or PARSE_SHA1_ALLOW_EMPTY. |
| 171 | */ |
| 172 | static int parse_next_oid(const char **next, const char *end, |
| 173 | struct object_id *oid, |
| 174 | const char *command, const char *refname, |
| 175 | int flags) |
| 176 | { |
| 177 | struct strbuf arg = STRBUF_INIT; |
| 178 | int ret = 0; |
| 179 | |
| 180 | if (*next == end) |
| 181 | goto eof; |
| 182 | |
| 183 | if (line_termination) { |
| 184 | /* Without -z, consume SP and use next argument */ |
| 185 | if (!**next || **next == line_termination) |
| 186 | return 1; |
| 187 | if (**next != ' ') |
| 188 | die("%s %s: expected SP but got: %s", |
| 189 | command, refname, *next); |
| 190 | (*next)++; |
| 191 | *next = parse_arg(*next, &arg); |
| 192 | if (arg.len) { |
| 193 | if (repo_get_oid_with_flags(the_repository, arg.buf, oid, |
| 194 | GET_OID_SKIP_AMBIGUITY_CHECK)) |
| 195 | goto invalid; |
| 196 | } else { |
| 197 | /* Without -z, an empty value means all zeros: */ |
| 198 | oidclr(oid, the_repository->hash_algo); |
| 199 | } |
| 200 | } else { |
| 201 | /* With -z, read the next NUL-terminated line */ |
| 202 | if (**next) |
| 203 | die("%s %s: expected NUL but got: %s", |
| 204 | command, refname, *next); |
| 205 | (*next)++; |
| 206 | if (*next == end) |
| 207 | goto eof; |
| 208 | strbuf_addstr(&arg, *next); |
| 209 | *next += arg.len; |
| 210 | |
| 211 | if (arg.len) { |
| 212 | if (repo_get_oid_with_flags(the_repository, arg.buf, oid, |
| 213 | GET_OID_SKIP_AMBIGUITY_CHECK)) |
| 214 | goto invalid; |
| 215 | } else if (flags & PARSE_SHA1_ALLOW_EMPTY) { |
| 216 | /* With -z, treat an empty value as all zeros: */ |
| 217 | warning("%s %s: missing <new-oid>, treating as zero", |
| 218 | command, refname); |
| 219 | oidclr(oid, the_repository->hash_algo); |
| 220 | } else { |
| 221 | /* |
| 222 | * With -z, an empty non-required value means |
| 223 | * unspecified: |
| 224 | */ |
| 225 | ret = 1; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | strbuf_release(&arg); |
| 230 | |
| 231 | return ret; |
| 232 | |
| 233 | invalid: |
| 234 | die(flags & PARSE_SHA1_OLD ? |
| 235 | "%s %s: invalid <old-oid>: %s" : |
| 236 | "%s %s: invalid <new-oid>: %s", |
| 237 | command, refname, arg.buf); |
| 238 | |
| 239 | eof: |
| 240 | die(flags & PARSE_SHA1_OLD ? |
| 241 | "%s %s: unexpected end of input when reading <old-oid>" : |
| 242 | "%s %s: unexpected end of input when reading <new-oid>", |
| 243 | command, refname); |
| 244 | } |
| 245 | |
| 246 | static void print_rejected_refs(const char *refname, |
| 247 | const struct object_id *old_oid, |
| 248 | const struct object_id *new_oid, |
| 249 | const char *old_target, |
| 250 | const char *new_target, |
| 251 | enum ref_transaction_error err, |
| 252 | const char *details, |
| 253 | void *cb_data UNUSED) |
| 254 | { |
| 255 | struct strbuf sb = STRBUF_INIT; |
| 256 | |
| 257 | if (details && *details) |
| 258 | error("%s", details); |
| 259 | |
| 260 | strbuf_addf(&sb, "rejected %s %s %s %s\n", refname, |
| 261 | new_oid ? oid_to_hex(new_oid) : new_target, |
| 262 | old_oid ? oid_to_hex(old_oid) : old_target, |
| 263 | ref_transaction_error_msg(err)); |
| 264 | |
| 265 | fwrite(sb.buf, sb.len, 1, stdout); |
| 266 | strbuf_release(&sb); |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * Handle transaction errors. If we're using batches updates, we want to only |
| 271 | * die for generic errors and print the remaining to the user. |
| 272 | */ |
| 273 | static void handle_ref_transaction_error(const char *refname, |
| 274 | struct object_id *new_oid, |
| 275 | struct object_id *old_oid, |
| 276 | const char *new_target, |
| 277 | const char *old_target, |
| 278 | enum ref_transaction_error tx_err, |
| 279 | struct strbuf *err, |
| 280 | struct command_options *opts) |
| 281 | { |
| 282 | if (!tx_err) |
| 283 | return; |
| 284 | |
| 285 | if (tx_err != REF_TRANSACTION_ERROR_GENERIC && opts->allow_update_failures) { |
| 286 | print_rejected_refs(refname, old_oid, new_oid, old_target, |
| 287 | new_target, tx_err, err->buf, NULL); |
| 288 | return; |
| 289 | } |
| 290 | |
| 291 | die("%s", err->buf); |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * The following five parse_cmd_*() functions parse the corresponding |
| 296 | * command. In each case, next points at the character following the |
| 297 | * command name and the following space. They each return a pointer |
| 298 | * to the character terminating the command, and die with an |
| 299 | * explanatory message if there are any parsing problems. All of |
| 300 | * these functions handle either text or binary format input, |
| 301 | * depending on how line_termination is set. |
| 302 | */ |
| 303 | |
| 304 | static void parse_cmd_update(struct ref_transaction *transaction, |
| 305 | const char *next, const char *end, |
| 306 | struct command_options *opts) |
| 307 | { |
| 308 | struct strbuf err = STRBUF_INIT; |
| 309 | char *refname; |
| 310 | struct object_id new_oid, old_oid; |
| 311 | enum ref_transaction_error tx_err; |
| 312 | int have_old; |
| 313 | |
| 314 | refname = parse_refname(&next); |
| 315 | if (!refname) |
| 316 | die("update: missing <ref>"); |
| 317 | |
| 318 | if (parse_next_oid(&next, end, &new_oid, "update", refname, |
| 319 | PARSE_SHA1_ALLOW_EMPTY)) |
| 320 | die("update %s: missing <new-oid>", refname); |
| 321 | |
| 322 | have_old = !parse_next_oid(&next, end, &old_oid, "update", refname, |
| 323 | PARSE_SHA1_OLD); |
| 324 | |
| 325 | if (*next != line_termination) |
| 326 | die("update %s: extra input: %s", refname, next); |
| 327 | |
| 328 | tx_err = ref_transaction_update(transaction, refname, |
| 329 | &new_oid, have_old ? &old_oid : NULL, |
| 330 | NULL, NULL, |
| 331 | update_flags | create_reflog_flag, |
| 332 | msg, &err); |
| 333 | handle_ref_transaction_error(refname, &new_oid, have_old ? &old_oid : NULL, |
| 334 | NULL, NULL, tx_err, &err, opts); |
| 335 | |
| 336 | |
| 337 | update_flags = default_flags; |
| 338 | free(refname); |
| 339 | strbuf_release(&err); |
| 340 | } |
| 341 | |
| 342 | static void parse_cmd_symref_update(struct ref_transaction *transaction, |
| 343 | const char *next, const char *end UNUSED, |
| 344 | struct command_options *opts) |
| 345 | { |
| 346 | char *refname, *new_target, *old_arg; |
| 347 | enum ref_transaction_error tx_err; |
| 348 | char *old_target = NULL; |
| 349 | struct strbuf err = STRBUF_INIT; |
| 350 | struct object_id old_oid; |
| 351 | int have_old_oid = 0; |
| 352 | |
| 353 | refname = parse_refname(&next); |
| 354 | if (!refname) |
| 355 | die("symref-update: missing <ref>"); |
| 356 | |
| 357 | new_target = parse_next_refname(&next); |
| 358 | if (!new_target) |
| 359 | die("symref-update %s: missing <new-target>", refname); |
| 360 | |
| 361 | old_arg = parse_next_arg(&next); |
| 362 | if (old_arg) { |
| 363 | old_target = parse_next_arg(&next); |
| 364 | if (!old_target) |
| 365 | die("symref-update %s: expected old value", refname); |
| 366 | |
| 367 | if (!strcmp(old_arg, "oid")) { |
| 368 | if (repo_get_oid_with_flags(the_repository, old_target, &old_oid, |
| 369 | GET_OID_SKIP_AMBIGUITY_CHECK)) |
| 370 | die("symref-update %s: invalid oid: %s", refname, old_target); |
| 371 | |
| 372 | have_old_oid = 1; |
| 373 | } else if (!strcmp(old_arg, "ref")) { |
| 374 | if (check_refname_format(old_target, REFNAME_ALLOW_ONELEVEL)) |
| 375 | die("symref-update %s: invalid ref: %s", refname, old_target); |
| 376 | } else { |
| 377 | die("symref-update %s: invalid arg '%s' for old value", refname, old_arg); |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | if (*next != line_termination) |
| 382 | die("symref-update %s: extra input: %s", refname, next); |
| 383 | |
| 384 | tx_err = ref_transaction_update(transaction, refname, NULL, |
| 385 | have_old_oid ? &old_oid : NULL, |
| 386 | new_target, |
| 387 | have_old_oid ? NULL : old_target, |
| 388 | update_flags | create_reflog_flag, |
| 389 | msg, &err); |
| 390 | handle_ref_transaction_error(refname, NULL, have_old_oid ? &old_oid : NULL, |
| 391 | new_target, have_old_oid ? NULL : old_target, |
| 392 | tx_err, &err, opts); |
| 393 | |
| 394 | update_flags = default_flags; |
| 395 | free(refname); |
| 396 | free(old_arg); |
| 397 | free(old_target); |
| 398 | free(new_target); |
| 399 | strbuf_release(&err); |
| 400 | } |
| 401 | |
| 402 | static void parse_cmd_create(struct ref_transaction *transaction, |
| 403 | const char *next, const char *end, |
| 404 | struct command_options *opts) |
| 405 | { |
| 406 | struct strbuf err = STRBUF_INIT; |
| 407 | char *refname; |
| 408 | struct object_id new_oid; |
| 409 | enum ref_transaction_error tx_err; |
| 410 | |
| 411 | refname = parse_refname(&next); |
| 412 | if (!refname) |
| 413 | die("create: missing <ref>"); |
| 414 | |
| 415 | if (parse_next_oid(&next, end, &new_oid, "create", refname, 0)) |
| 416 | die("create %s: missing <new-oid>", refname); |
| 417 | |
| 418 | if (is_null_oid(&new_oid)) |
| 419 | die("create %s: zero <new-oid>", refname); |
| 420 | |
| 421 | if (*next != line_termination) |
| 422 | die("create %s: extra input: %s", refname, next); |
| 423 | |
| 424 | tx_err = ref_transaction_create(transaction, refname, &new_oid, NULL, |
| 425 | update_flags | create_reflog_flag, |
| 426 | msg, &err); |
| 427 | handle_ref_transaction_error(refname, &new_oid, NULL, NULL, NULL, tx_err, |
| 428 | &err, opts); |
| 429 | |
| 430 | update_flags = default_flags; |
| 431 | free(refname); |
| 432 | strbuf_release(&err); |
| 433 | } |
| 434 | |
| 435 | static void parse_cmd_symref_create(struct ref_transaction *transaction, |
| 436 | const char *next, const char *end UNUSED, |
| 437 | struct command_options *opts) |
| 438 | { |
| 439 | struct strbuf err = STRBUF_INIT; |
| 440 | char *refname, *new_target; |
| 441 | enum ref_transaction_error tx_err; |
| 442 | |
| 443 | refname = parse_refname(&next); |
| 444 | if (!refname) |
| 445 | die("symref-create: missing <ref>"); |
| 446 | |
| 447 | new_target = parse_next_refname(&next); |
| 448 | if (!new_target) |
| 449 | die("symref-create %s: missing <new-target>", refname); |
| 450 | |
| 451 | if (*next != line_termination) |
| 452 | die("symref-create %s: extra input: %s", refname, next); |
| 453 | |
| 454 | tx_err = ref_transaction_create(transaction, refname, NULL, new_target, |
| 455 | update_flags | create_reflog_flag, |
| 456 | msg, &err); |
| 457 | handle_ref_transaction_error(refname, NULL, NULL, new_target, NULL, |
| 458 | tx_err, &err, opts); |
| 459 | |
| 460 | update_flags = default_flags; |
| 461 | free(refname); |
| 462 | free(new_target); |
| 463 | strbuf_release(&err); |
| 464 | } |
| 465 | |
| 466 | static void parse_cmd_delete(struct ref_transaction *transaction, |
| 467 | const char *next, const char *end, |
| 468 | struct command_options *opts UNUSED) |
| 469 | { |
| 470 | struct strbuf err = STRBUF_INIT; |
| 471 | char *refname; |
| 472 | struct object_id old_oid; |
| 473 | int have_old; |
| 474 | |
| 475 | refname = parse_refname(&next); |
| 476 | if (!refname) |
| 477 | die("delete: missing <ref>"); |
| 478 | |
| 479 | if (parse_next_oid(&next, end, &old_oid, "delete", refname, |
| 480 | PARSE_SHA1_OLD)) { |
| 481 | have_old = 0; |
| 482 | } else { |
| 483 | if (is_null_oid(&old_oid)) |
| 484 | die("delete %s: zero <old-oid>", refname); |
| 485 | have_old = 1; |
| 486 | } |
| 487 | |
| 488 | if (*next != line_termination) |
| 489 | die("delete %s: extra input: %s", refname, next); |
| 490 | |
| 491 | if (ref_transaction_delete(transaction, refname, |
| 492 | have_old ? &old_oid : NULL, |
| 493 | NULL, update_flags, msg, &err)) |
| 494 | die("%s", err.buf); |
| 495 | |
| 496 | update_flags = default_flags; |
| 497 | free(refname); |
| 498 | strbuf_release(&err); |
| 499 | } |
| 500 | |
| 501 | static void parse_cmd_symref_delete(struct ref_transaction *transaction, |
| 502 | const char *next, const char *end UNUSED, |
| 503 | struct command_options *opts UNUSED) |
| 504 | { |
| 505 | struct strbuf err = STRBUF_INIT; |
| 506 | char *refname, *old_target; |
| 507 | |
| 508 | if (!(update_flags & REF_NO_DEREF)) |
| 509 | die("symref-delete: cannot operate with deref mode"); |
| 510 | |
| 511 | refname = parse_refname(&next); |
| 512 | if (!refname) |
| 513 | die("symref-delete: missing <ref>"); |
| 514 | |
| 515 | old_target = parse_next_refname(&next); |
| 516 | |
| 517 | if (*next != line_termination) |
| 518 | die("symref-delete %s: extra input: %s", refname, next); |
| 519 | |
| 520 | if (ref_transaction_delete(transaction, refname, NULL, |
| 521 | old_target, update_flags, msg, &err)) |
| 522 | die("%s", err.buf); |
| 523 | |
| 524 | update_flags = default_flags; |
| 525 | free(refname); |
| 526 | free(old_target); |
| 527 | strbuf_release(&err); |
| 528 | } |
| 529 | |
| 530 | static void parse_cmd_verify(struct ref_transaction *transaction, |
| 531 | const char *next, const char *end, |
| 532 | struct command_options *opts UNUSED) |
| 533 | { |
| 534 | struct strbuf err = STRBUF_INIT; |
| 535 | char *refname; |
| 536 | struct object_id old_oid; |
| 537 | |
| 538 | refname = parse_refname(&next); |
| 539 | if (!refname) |
| 540 | die("verify: missing <ref>"); |
| 541 | |
| 542 | if (parse_next_oid(&next, end, &old_oid, "verify", refname, |
| 543 | PARSE_SHA1_OLD)) |
| 544 | oidclr(&old_oid, the_repository->hash_algo); |
| 545 | |
| 546 | if (*next != line_termination) |
| 547 | die("verify %s: extra input: %s", refname, next); |
| 548 | |
| 549 | if (ref_transaction_verify(transaction, refname, &old_oid, |
| 550 | NULL, update_flags, &err)) |
| 551 | die("%s", err.buf); |
| 552 | |
| 553 | update_flags = default_flags; |
| 554 | free(refname); |
| 555 | strbuf_release(&err); |
| 556 | } |
| 557 | |
| 558 | static void parse_cmd_symref_verify(struct ref_transaction *transaction, |
| 559 | const char *next, const char *end UNUSED, |
| 560 | struct command_options *opts UNUSED) |
| 561 | { |
| 562 | struct strbuf err = STRBUF_INIT; |
| 563 | struct object_id old_oid; |
| 564 | char *refname, *old_target; |
| 565 | |
| 566 | if (!(update_flags & REF_NO_DEREF)) |
| 567 | die("symref-verify: cannot operate with deref mode"); |
| 568 | |
| 569 | refname = parse_refname(&next); |
| 570 | if (!refname) |
| 571 | die("symref-verify: missing <ref>"); |
| 572 | |
| 573 | /* |
| 574 | * old_ref is optional, if not provided, we need to ensure that the |
| 575 | * ref doesn't exist. |
| 576 | */ |
| 577 | old_target = parse_next_refname(&next); |
| 578 | if (!old_target) |
| 579 | oidcpy(&old_oid, null_oid(the_hash_algo)); |
| 580 | |
| 581 | if (*next != line_termination) |
| 582 | die("symref-verify %s: extra input: %s", refname, next); |
| 583 | |
| 584 | if (ref_transaction_verify(transaction, refname, |
| 585 | old_target ? NULL : &old_oid, |
| 586 | old_target, update_flags, &err)) |
| 587 | die("%s", err.buf); |
| 588 | |
| 589 | update_flags = default_flags; |
| 590 | free(refname); |
| 591 | free(old_target); |
| 592 | strbuf_release(&err); |
| 593 | } |
| 594 | |
| 595 | static void report_ok(const char *command) |
| 596 | { |
| 597 | fprintf(stdout, "%s: ok\n", command); |
| 598 | fflush(stdout); |
| 599 | } |
| 600 | |
| 601 | static void parse_cmd_option(struct ref_transaction *transaction UNUSED, |
| 602 | const char *next, const char *end UNUSED, |
| 603 | struct command_options *opts UNUSED) |
| 604 | { |
| 605 | const char *rest; |
| 606 | if (skip_prefix(next, "no-deref", &rest) && *rest == line_termination) |
| 607 | update_flags |= REF_NO_DEREF; |
| 608 | else |
| 609 | die("option unknown: %s", next); |
| 610 | } |
| 611 | |
| 612 | static void parse_cmd_start(struct ref_transaction *transaction UNUSED, |
| 613 | const char *next, const char *end UNUSED, |
| 614 | struct command_options *opts UNUSED) |
| 615 | { |
| 616 | if (*next != line_termination) |
| 617 | die("start: extra input: %s", next); |
| 618 | report_ok("start"); |
| 619 | } |
| 620 | |
| 621 | static void parse_cmd_prepare(struct ref_transaction *transaction, |
| 622 | const char *next, const char *end UNUSED, |
| 623 | struct command_options *opts UNUSED) |
| 624 | { |
| 625 | struct strbuf error = STRBUF_INIT; |
| 626 | if (*next != line_termination) |
| 627 | die("prepare: extra input: %s", next); |
| 628 | if (ref_transaction_prepare(transaction, &error)) |
| 629 | die("prepare: %s", error.buf); |
| 630 | report_ok("prepare"); |
| 631 | } |
| 632 | |
| 633 | static void parse_cmd_abort(struct ref_transaction *transaction, |
| 634 | const char *next, const char *end UNUSED, |
| 635 | struct command_options *opts UNUSED) |
| 636 | { |
| 637 | struct strbuf error = STRBUF_INIT; |
| 638 | if (*next != line_termination) |
| 639 | die("abort: extra input: %s", next); |
| 640 | if (ref_transaction_abort(transaction, &error)) |
| 641 | die("abort: %s", error.buf); |
| 642 | report_ok("abort"); |
| 643 | } |
| 644 | |
| 645 | static void parse_cmd_commit(struct ref_transaction *transaction, |
| 646 | const char *next, const char *end UNUSED, |
| 647 | struct command_options *opts UNUSED) |
| 648 | { |
| 649 | struct strbuf error = STRBUF_INIT; |
| 650 | if (*next != line_termination) |
| 651 | die("commit: extra input: %s", next); |
| 652 | if (ref_transaction_commit(transaction, &error)) |
| 653 | die("commit: %s", error.buf); |
| 654 | |
| 655 | ref_transaction_for_each_rejected_update(transaction, |
| 656 | print_rejected_refs, NULL); |
| 657 | |
| 658 | report_ok("commit"); |
| 659 | ref_transaction_free(transaction); |
| 660 | } |
| 661 | |
| 662 | enum update_refs_state { |
| 663 | /* Non-transactional state open for updates. */ |
| 664 | UPDATE_REFS_OPEN, |
| 665 | /* A transaction has been started. */ |
| 666 | UPDATE_REFS_STARTED, |
| 667 | /* References are locked and ready for commit */ |
| 668 | UPDATE_REFS_PREPARED, |
| 669 | /* Transaction has been committed or closed. */ |
| 670 | UPDATE_REFS_CLOSED, |
| 671 | }; |
| 672 | |
| 673 | static const struct parse_cmd { |
| 674 | const char *prefix; |
| 675 | void (*fn)(struct ref_transaction *, const char *, const char *, |
| 676 | struct command_options *); |
| 677 | unsigned args; |
| 678 | enum update_refs_state state; |
| 679 | } command[] = { |
| 680 | { "update", parse_cmd_update, 3, UPDATE_REFS_OPEN }, |
| 681 | { "create", parse_cmd_create, 2, UPDATE_REFS_OPEN }, |
| 682 | { "delete", parse_cmd_delete, 2, UPDATE_REFS_OPEN }, |
| 683 | { "verify", parse_cmd_verify, 2, UPDATE_REFS_OPEN }, |
| 684 | { "symref-update", parse_cmd_symref_update, 4, UPDATE_REFS_OPEN }, |
| 685 | { "symref-create", parse_cmd_symref_create, 2, UPDATE_REFS_OPEN }, |
| 686 | { "symref-delete", parse_cmd_symref_delete, 2, UPDATE_REFS_OPEN }, |
| 687 | { "symref-verify", parse_cmd_symref_verify, 2, UPDATE_REFS_OPEN }, |
| 688 | { "option", parse_cmd_option, 1, UPDATE_REFS_OPEN }, |
| 689 | { "start", parse_cmd_start, 0, UPDATE_REFS_STARTED }, |
| 690 | { "prepare", parse_cmd_prepare, 0, UPDATE_REFS_PREPARED }, |
| 691 | { "abort", parse_cmd_abort, 0, UPDATE_REFS_CLOSED }, |
| 692 | { "commit", parse_cmd_commit, 0, UPDATE_REFS_CLOSED }, |
| 693 | }; |
| 694 | |
| 695 | static void update_refs_stdin(unsigned int flags) |
| 696 | { |
| 697 | struct strbuf input = STRBUF_INIT, err = STRBUF_INIT; |
| 698 | enum update_refs_state state = UPDATE_REFS_OPEN; |
| 699 | struct ref_transaction *transaction; |
| 700 | int i, j; |
| 701 | |
| 702 | struct command_options opts = { |
| 703 | .allow_update_failures = flags & REF_TRANSACTION_ALLOW_FAILURE, |
| 704 | }; |
| 705 | |
| 706 | transaction = ref_store_transaction_begin(get_main_ref_store(the_repository), |
| 707 | flags, &err); |
| 708 | if (!transaction) |
| 709 | die("%s", err.buf); |
| 710 | |
| 711 | /* Read each line dispatch its command */ |
| 712 | while (!strbuf_getwholeline(&input, stdin, line_termination)) { |
| 713 | const struct parse_cmd *cmd = NULL; |
| 714 | |
| 715 | if (*input.buf == line_termination) |
| 716 | die("empty command in input"); |
| 717 | else if (isspace(*input.buf)) |
| 718 | die("whitespace before command: %s", input.buf); |
| 719 | |
| 720 | for (i = 0; i < ARRAY_SIZE(command); i++) { |
| 721 | const char *prefix = command[i].prefix; |
| 722 | char c; |
| 723 | |
| 724 | if (!starts_with(input.buf, prefix)) |
| 725 | continue; |
| 726 | |
| 727 | /* |
| 728 | * If the command has arguments, verify that it's |
| 729 | * followed by a space. Otherwise, it shall be followed |
| 730 | * by a line terminator. |
| 731 | */ |
| 732 | c = command[i].args ? ' ' : line_termination; |
| 733 | if (input.buf[strlen(prefix)] != c) |
| 734 | continue; |
| 735 | |
| 736 | cmd = &command[i]; |
| 737 | break; |
| 738 | } |
| 739 | if (!cmd) |
| 740 | die("unknown command: %s", input.buf); |
| 741 | |
| 742 | /* |
| 743 | * Read additional arguments if NUL-terminated. Do not raise an |
| 744 | * error in case there is an early EOF to let the command |
| 745 | * handle missing arguments with a proper error message. |
| 746 | */ |
| 747 | for (j = 1; line_termination == '\0' && j < cmd->args; j++) |
| 748 | if (strbuf_appendwholeline(&input, stdin, line_termination)) |
| 749 | break; |
| 750 | |
| 751 | switch (state) { |
| 752 | case UPDATE_REFS_OPEN: |
| 753 | case UPDATE_REFS_STARTED: |
| 754 | if (state == UPDATE_REFS_STARTED && cmd->state == UPDATE_REFS_STARTED) |
| 755 | die("cannot restart ongoing transaction"); |
| 756 | /* Do not downgrade a transaction to a non-transaction. */ |
| 757 | if (cmd->state >= state) |
| 758 | state = cmd->state; |
| 759 | break; |
| 760 | case UPDATE_REFS_PREPARED: |
| 761 | if (cmd->state != UPDATE_REFS_CLOSED) |
| 762 | die("prepared transactions can only be closed"); |
| 763 | state = cmd->state; |
| 764 | break; |
| 765 | case UPDATE_REFS_CLOSED: |
| 766 | if (cmd->state != UPDATE_REFS_STARTED) |
| 767 | die("transaction is closed"); |
| 768 | |
| 769 | /* |
| 770 | * Open a new transaction if we're currently closed and |
| 771 | * get a "start". |
| 772 | */ |
| 773 | state = cmd->state; |
| 774 | transaction = ref_store_transaction_begin(get_main_ref_store(the_repository), |
| 775 | flags, &err); |
| 776 | if (!transaction) |
| 777 | die("%s", err.buf); |
| 778 | |
| 779 | break; |
| 780 | } |
| 781 | |
| 782 | cmd->fn(transaction, input.buf + strlen(cmd->prefix) + !!cmd->args, |
| 783 | input.buf + input.len, &opts); |
| 784 | } |
| 785 | |
| 786 | switch (state) { |
| 787 | case UPDATE_REFS_OPEN: |
| 788 | /* Commit by default if no transaction was requested. */ |
| 789 | if (ref_transaction_commit(transaction, &err)) |
| 790 | die("%s", err.buf); |
| 791 | ref_transaction_for_each_rejected_update(transaction, |
| 792 | print_rejected_refs, NULL); |
| 793 | ref_transaction_free(transaction); |
| 794 | break; |
| 795 | case UPDATE_REFS_STARTED: |
| 796 | case UPDATE_REFS_PREPARED: |
| 797 | /* If using a transaction, we want to abort it. */ |
| 798 | if (ref_transaction_abort(transaction, &err)) |
| 799 | die("%s", err.buf); |
| 800 | break; |
| 801 | case UPDATE_REFS_CLOSED: |
| 802 | /* Otherwise no need to do anything, the transaction was closed already. */ |
| 803 | break; |
| 804 | } |
| 805 | |
| 806 | strbuf_release(&err); |
| 807 | strbuf_release(&input); |
| 808 | } |
| 809 | |
| 810 | int cmd_update_ref(int argc, |
| 811 | const char **argv, |
| 812 | const char *prefix, |
| 813 | struct repository *repo UNUSED) |
| 814 | { |
| 815 | const char *refname, *oldval; |
| 816 | struct object_id oid, oldoid; |
| 817 | int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0; |
| 818 | int create_reflog = 0; |
| 819 | unsigned int flags = 0; |
| 820 | |
| 821 | struct option options[] = { |
| 822 | OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")), |
| 823 | OPT_BOOL('d', NULL, &delete, N_("delete the reference")), |
| 824 | OPT_BOOL( 0 , "no-deref", &no_deref, |
| 825 | N_("update <refname> not the one it points to")), |
| 826 | OPT_BOOL('z', NULL, &end_null, N_("stdin has NUL-terminated arguments")), |
| 827 | OPT_BOOL( 0 , "stdin", &read_stdin, N_("read updates from stdin")), |
| 828 | OPT_BOOL( 0 , "create-reflog", &create_reflog, N_("create a reflog")), |
| 829 | OPT_BIT('0', "batch-updates", &flags, N_("batch reference updates"), |
| 830 | REF_TRANSACTION_ALLOW_FAILURE), |
| 831 | OPT_END(), |
| 832 | }; |
| 833 | |
| 834 | repo_config(the_repository, git_default_config, NULL); |
| 835 | argc = parse_options(argc, argv, prefix, options, git_update_ref_usage, |
| 836 | 0); |
| 837 | if (msg && !*msg) |
| 838 | die("Refusing to perform update with empty message."); |
| 839 | |
| 840 | create_reflog_flag = create_reflog ? REF_FORCE_CREATE_REFLOG : 0; |
| 841 | |
| 842 | if (no_deref) { |
| 843 | default_flags = REF_NO_DEREF; |
| 844 | update_flags = default_flags; |
| 845 | } |
| 846 | |
| 847 | if (read_stdin) { |
| 848 | if (delete || argc > 0) |
| 849 | usage_with_options(git_update_ref_usage, options); |
| 850 | if (end_null) |
| 851 | line_termination = '\0'; |
| 852 | update_refs_stdin(flags); |
| 853 | return 0; |
| 854 | } else if (flags & REF_TRANSACTION_ALLOW_FAILURE) { |
| 855 | die("--batch-updates can only be used with --stdin"); |
| 856 | } |
| 857 | |
| 858 | if (end_null) |
| 859 | usage_with_options(git_update_ref_usage, options); |
| 860 | |
| 861 | if (delete) { |
| 862 | if (argc < 1 || argc > 2) |
| 863 | usage_with_options(git_update_ref_usage, options); |
| 864 | refname = argv[0]; |
| 865 | oldval = argv[1]; |
| 866 | } else { |
| 867 | const char *value; |
| 868 | if (argc < 2 || argc > 3) |
| 869 | usage_with_options(git_update_ref_usage, options); |
| 870 | refname = argv[0]; |
| 871 | value = argv[1]; |
| 872 | oldval = argv[2]; |
| 873 | if (repo_get_oid_with_flags(the_repository, value, &oid, |
| 874 | GET_OID_SKIP_AMBIGUITY_CHECK)) |
| 875 | die("%s: not a valid SHA1", value); |
| 876 | } |
| 877 | |
| 878 | if (oldval) { |
| 879 | if (!*oldval) |
| 880 | /* |
| 881 | * The empty string implies that the reference |
| 882 | * must not already exist: |
| 883 | */ |
| 884 | oidclr(&oldoid, the_repository->hash_algo); |
| 885 | else if (repo_get_oid_with_flags(the_repository, oldval, &oldoid, |
| 886 | GET_OID_SKIP_AMBIGUITY_CHECK)) |
| 887 | die("%s: not a valid old SHA1", oldval); |
| 888 | } |
| 889 | |
| 890 | if (delete) |
| 891 | /* |
| 892 | * For purposes of backwards compatibility, we treat |
| 893 | * NULL_SHA1 as "don't care" here: |
| 894 | */ |
| 895 | return refs_delete_ref(get_main_ref_store(the_repository), |
| 896 | msg, refname, |
| 897 | (oldval && !is_null_oid(&oldoid)) ? &oldoid : NULL, |
| 898 | default_flags); |
| 899 | else |
| 900 | return refs_update_ref(get_main_ref_store(the_repository), |
| 901 | msg, refname, &oid, |
| 902 | oldval ? &oldoid : NULL, |
| 903 | default_flags | create_reflog_flag, |
| 904 | UPDATE_REFS_DIE_ON_ERR); |
| 905 | } |