diff options
Diffstat (limited to 'builtin-show-ref.c')
| -rw-r--r-- | builtin-show-ref.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/builtin-show-ref.c b/builtin-show-ref.c new file mode 100644 index 0000000000..65051d14fd --- /dev/null +++ b/builtin-show-ref.c @@ -0,0 +1,253 @@ +#include "builtin.h" +#include "cache.h" +#include "refs.h" +#include "object.h" +#include "tag.h" +#include "path-list.h" + +static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*] < ref-list"; + +static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0, + found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0; +static const char **pattern; + +static void show_one(const char *refname, const unsigned char *sha1) +{ + const char *hex = find_unique_abbrev(sha1, abbrev); + if (hash_only) + printf("%s\n", hex); + else + printf("%s %s\n", hex, refname); +} + +static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata) +{ + struct object *obj; + const char *hex; + unsigned char peeled[20]; + + if (tags_only || heads_only) { + int match; + + match = heads_only && !prefixcmp(refname, "refs/heads/"); + match |= tags_only && !prefixcmp(refname, "refs/tags/"); + if (!match) + return 0; + } + if (pattern) { + int reflen = strlen(refname); + const char **p = pattern, *m; + while ((m = *p++) != NULL) { + int len = strlen(m); + if (len > reflen) + continue; + if (memcmp(m, refname + reflen - len, len)) + continue; + if (len == reflen) + goto match; + /* "--verify" requires an exact match */ + if (verify) + continue; + if (refname[reflen - len - 1] == '/') + goto match; + } + return 0; + } + +match: + found_match++; + + /* This changes the semantics slightly that even under quiet we + * detect and return error if the repository is corrupt and + * ref points at a nonexistent object. + */ + if (!has_sha1_file(sha1)) + die("git-show-ref: bad ref %s (%s)", refname, + sha1_to_hex(sha1)); + + if (quiet) + return 0; + + show_one(refname, sha1); + + if (!deref_tags) + return 0; + + if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) { + if (!is_null_sha1(peeled)) { + hex = find_unique_abbrev(peeled, abbrev); + printf("%s %s^{}\n", hex, refname); + } + } + else { + obj = parse_object(sha1); + if (!obj) + die("git-show-ref: bad ref %s (%s)", refname, + sha1_to_hex(sha1)); + if (obj->type == OBJ_TAG) { + obj = deref_tag(obj, refname, 0); + hex = find_unique_abbrev(obj->sha1, abbrev); + printf("%s %s^{}\n", hex, refname); + } + } + return 0; +} + +static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata) +{ + struct path_list *list = (struct path_list *)cbdata; + path_list_insert(refname, list); + return 0; +} + +/* + * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input, + * and + * (1) strip "^{}" at the end of line if any; + * (2) ignore if match is provided and does not head-match refname; + * (3) warn if refname is not a well-formed refname and skip; + * (4) ignore if refname is a ref that exists in the local repository; + * (5) otherwise output the line. + */ +static int exclude_existing(const char *match) +{ + static struct path_list existing_refs = { NULL, 0, 0, 0 }; + char buf[1024]; + int matchlen = match ? strlen(match) : 0; + + for_each_ref(add_existing, &existing_refs); + while (fgets(buf, sizeof(buf), stdin)) { + char *ref; + int len = strlen(buf); + + if (len > 0 && buf[len - 1] == '\n') + buf[--len] = '\0'; + if (3 <= len && !strcmp(buf + len - 3, "^{}")) { + len -= 3; + buf[len] = '\0'; + } + for (ref = buf + len; buf < ref; ref--) + if (isspace(ref[-1])) + break; + if (match) { + int reflen = buf + len - ref; + if (reflen < matchlen) + continue; + if (strncmp(ref, match, matchlen)) + continue; + } + if (check_ref_format(ref)) { + fprintf(stderr, "warning: ref '%s' ignored\n", ref); + continue; + } + if (!path_list_has_path(&existing_refs, ref)) { + printf("%s\n", buf); + } + } + return 0; +} + +int cmd_show_ref(int argc, const char **argv, const char *prefix) +{ + int i; + + for (i = 1; i < argc; i++) { + const char *arg = argv[i]; + if (*arg != '-') { + pattern = argv + i; + break; + } + if (!strcmp(arg, "--")) { + pattern = argv + i + 1; + if (!*pattern) + pattern = NULL; + break; + } + if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) { + quiet = 1; + continue; + } + if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) { + show_head = 1; + continue; + } + if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) { + deref_tags = 1; + continue; + } + if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) { + hash_only = 1; + continue; + } + if (!prefixcmp(arg, "--hash=") || + (!prefixcmp(arg, "--abbrev") && + (arg[8] == '=' || arg[8] == '\0'))) { + if (arg[2] != 'h' && !arg[8]) + /* --abbrev only */ + abbrev = DEFAULT_ABBREV; + else { + /* --hash= or --abbrev= */ + char *end; + if (arg[2] == 'h') { + hash_only = 1; + arg += 7; + } + else + arg += 9; + abbrev = strtoul(arg, &end, 10); + if (*end || abbrev > 40) + usage(show_ref_usage); + if (abbrev < MINIMUM_ABBREV) + abbrev = MINIMUM_ABBREV; + } + continue; + } + if (!strcmp(arg, "--verify")) { + verify = 1; + continue; + } + if (!strcmp(arg, "--tags")) { + tags_only = 1; + continue; + } + if (!strcmp(arg, "--heads")) { + heads_only = 1; + continue; + } + if (!strcmp(arg, "--exclude-existing")) + return exclude_existing(NULL); + if (!prefixcmp(arg, "--exclude-existing=")) + return exclude_existing(arg + 19); + usage(show_ref_usage); + } + + if (verify) { + if (!pattern) + die("--verify requires a reference"); + while (*pattern) { + unsigned char sha1[20]; + + if (!prefixcmp(*pattern, "refs/") && + resolve_ref(*pattern, sha1, 1, NULL)) { + if (!quiet) + show_one(*pattern, sha1); + } + else if (!quiet) + die("'%s' - not a valid ref", *pattern); + else + return 1; + pattern++; + } + return 0; + } + + if (show_head) + head_ref(show_ref, NULL); + for_each_ref(show_ref, NULL); + if (!found_match) { + if (verify && !quiet) + die("No match"); + return 1; + } + return 0; +} |