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![Nguyễn Thái Ngọc Duy](/assets/img/avatar_default.png)
resolve_ref() may return a pointer to a static buffer, which is not safe for long-term use because if another resolve_ref() call happens, the buffer may be changed. Many call sites though do not care about this buffer. They simply check if the return value is NULL or not. Convert all these call sites to new wrappers to reduce resolve_ref() calls from 57 to 34. If we change resolve_ref() prototype later on to avoid passing static buffer out, this helps reduce changes. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
251 lines
6.4 KiB
C
251 lines
6.4 KiB
C
#include "builtin.h"
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#include "cache.h"
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#include "refs.h"
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#include "object.h"
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#include "tag.h"
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#include "string-list.h"
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#include "parse-options.h"
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static const char * const show_ref_usage[] = {
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"git show-ref [-q|--quiet] [--verify] [--head] [-d|--dereference] [-s|--hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [pattern*] ",
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"git show-ref --exclude-existing[=pattern] < ref-list",
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NULL
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};
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static int deref_tags, show_head, tags_only, heads_only, found_match, verify,
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quiet, hash_only, abbrev, exclude_arg;
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static const char **pattern;
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static const char *exclude_existing_arg;
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static void show_one(const char *refname, const unsigned char *sha1)
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{
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const char *hex = find_unique_abbrev(sha1, abbrev);
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if (hash_only)
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printf("%s\n", hex);
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else
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printf("%s %s\n", hex, refname);
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}
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static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
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{
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struct object *obj;
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const char *hex;
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unsigned char peeled[20];
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if (tags_only || heads_only) {
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int match;
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match = heads_only && !prefixcmp(refname, "refs/heads/");
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match |= tags_only && !prefixcmp(refname, "refs/tags/");
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if (!match)
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return 0;
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}
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if (pattern) {
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int reflen = strlen(refname);
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const char **p = pattern, *m;
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while ((m = *p++) != NULL) {
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int len = strlen(m);
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if (len > reflen)
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continue;
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if (memcmp(m, refname + reflen - len, len))
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continue;
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if (len == reflen)
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goto match;
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/* "--verify" requires an exact match */
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if (verify)
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continue;
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if (refname[reflen - len - 1] == '/')
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goto match;
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}
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return 0;
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}
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match:
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found_match++;
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/* This changes the semantics slightly that even under quiet we
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* detect and return error if the repository is corrupt and
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* ref points at a nonexistent object.
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*/
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if (!has_sha1_file(sha1))
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die("git show-ref: bad ref %s (%s)", refname,
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sha1_to_hex(sha1));
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if (quiet)
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return 0;
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show_one(refname, sha1);
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if (!deref_tags)
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return 0;
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if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
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if (!is_null_sha1(peeled)) {
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hex = find_unique_abbrev(peeled, abbrev);
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printf("%s %s^{}\n", hex, refname);
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}
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}
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else {
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obj = parse_object(sha1);
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if (!obj)
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die("git show-ref: bad ref %s (%s)", refname,
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sha1_to_hex(sha1));
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if (obj->type == OBJ_TAG) {
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obj = deref_tag(obj, refname, 0);
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if (!obj)
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die("git show-ref: bad tag at ref %s (%s)", refname,
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sha1_to_hex(sha1));
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hex = find_unique_abbrev(obj->sha1, abbrev);
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printf("%s %s^{}\n", hex, refname);
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}
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}
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return 0;
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}
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static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
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{
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struct string_list *list = (struct string_list *)cbdata;
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string_list_insert(list, refname);
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return 0;
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}
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/*
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* read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
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* and
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* (1) strip "^{}" at the end of line if any;
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* (2) ignore if match is provided and does not head-match refname;
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* (3) warn if refname is not a well-formed refname and skip;
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* (4) ignore if refname is a ref that exists in the local repository;
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* (5) otherwise output the line.
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*/
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static int exclude_existing(const char *match)
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{
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static struct string_list existing_refs = STRING_LIST_INIT_NODUP;
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char buf[1024];
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int matchlen = match ? strlen(match) : 0;
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for_each_ref(add_existing, &existing_refs);
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while (fgets(buf, sizeof(buf), stdin)) {
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char *ref;
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int len = strlen(buf);
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if (len > 0 && buf[len - 1] == '\n')
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buf[--len] = '\0';
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if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
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len -= 3;
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buf[len] = '\0';
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}
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for (ref = buf + len; buf < ref; ref--)
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if (isspace(ref[-1]))
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break;
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if (match) {
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int reflen = buf + len - ref;
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if (reflen < matchlen)
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continue;
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if (strncmp(ref, match, matchlen))
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continue;
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}
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if (check_refname_format(ref, 0)) {
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warning("ref '%s' ignored", ref);
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continue;
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}
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if (!string_list_has_string(&existing_refs, ref)) {
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printf("%s\n", buf);
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}
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}
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return 0;
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}
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static int hash_callback(const struct option *opt, const char *arg, int unset)
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{
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hash_only = 1;
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/* Use full length SHA1 if no argument */
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if (!arg)
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return 0;
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return parse_opt_abbrev_cb(opt, arg, unset);
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}
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static int exclude_existing_callback(const struct option *opt, const char *arg,
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int unset)
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{
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exclude_arg = 1;
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*(const char **)opt->value = arg;
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return 0;
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}
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static int help_callback(const struct option *opt, const char *arg, int unset)
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{
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return -1;
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}
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static const struct option show_ref_options[] = {
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OPT_BOOLEAN(0, "tags", &tags_only, "only show tags (can be combined with heads)"),
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OPT_BOOLEAN(0, "heads", &heads_only, "only show heads (can be combined with tags)"),
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OPT_BOOLEAN(0, "verify", &verify, "stricter reference checking, "
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"requires exact ref path"),
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{ OPTION_BOOLEAN, 'h', NULL, &show_head, NULL,
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"show the HEAD reference",
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PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
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OPT_BOOLEAN(0, "head", &show_head, "show the HEAD reference"),
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OPT_BOOLEAN('d', "dereference", &deref_tags,
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"dereference tags into object IDs"),
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{ OPTION_CALLBACK, 's', "hash", &abbrev, "n",
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"only show SHA1 hash using <n> digits",
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PARSE_OPT_OPTARG, &hash_callback },
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OPT__ABBREV(&abbrev),
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OPT__QUIET(&quiet,
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"do not print results to stdout (useful with --verify)"),
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{ OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg,
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"pattern", "show refs from stdin that aren't in local repository",
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PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback },
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{ OPTION_CALLBACK, 0, "help-all", NULL, NULL, "show usage",
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PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
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OPT_END()
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};
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int cmd_show_ref(int argc, const char **argv, const char *prefix)
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{
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if (argc == 2 && !strcmp(argv[1], "-h"))
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usage_with_options(show_ref_usage, show_ref_options);
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argc = parse_options(argc, argv, prefix, show_ref_options,
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show_ref_usage, PARSE_OPT_NO_INTERNAL_HELP);
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if (exclude_arg)
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return exclude_existing(exclude_existing_arg);
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pattern = argv;
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if (!*pattern)
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pattern = NULL;
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if (verify) {
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if (!pattern)
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die("--verify requires a reference");
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while (*pattern) {
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unsigned char sha1[20];
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if (!prefixcmp(*pattern, "refs/") &&
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!read_ref(*pattern, sha1)) {
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if (!quiet)
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show_one(*pattern, sha1);
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}
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else if (!quiet)
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die("'%s' - not a valid ref", *pattern);
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else
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return 1;
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pattern++;
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}
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return 0;
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}
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if (show_head)
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head_ref(show_ref, NULL);
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for_each_ref(show_ref, NULL);
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if (!found_match) {
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if (verify && !quiet)
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die("No match");
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return 1;
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}
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return 0;
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}
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