Sync with 1.8.0.3
[git/git.git] / builtin / show-ref.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "refs.h"
4 #include "object.h"
5 #include "tag.h"
6 #include "string-list.h"
7 #include "parse-options.h"
8
9 static const char * const show_ref_usage[] = {
10 N_("git show-ref [-q|--quiet] [--verify] [--head] [-d|--dereference] [-s|--hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [pattern*] "),
11 N_("git show-ref --exclude-existing[=pattern] < ref-list"),
12 NULL
13 };
14
15 static int deref_tags, show_head, tags_only, heads_only, found_match, verify,
16 quiet, hash_only, abbrev, exclude_arg;
17 static const char **pattern;
18 static const char *exclude_existing_arg;
19
20 static void show_one(const char *refname, const unsigned char *sha1)
21 {
22 const char *hex = find_unique_abbrev(sha1, abbrev);
23 if (hash_only)
24 printf("%s\n", hex);
25 else
26 printf("%s %s\n", hex, refname);
27 }
28
29 static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
30 {
31 const char *hex;
32 unsigned char peeled[20];
33
34 if (tags_only || heads_only) {
35 int match;
36
37 match = heads_only && !prefixcmp(refname, "refs/heads/");
38 match |= tags_only && !prefixcmp(refname, "refs/tags/");
39 if (!match)
40 return 0;
41 }
42 if (pattern) {
43 int reflen = strlen(refname);
44 const char **p = pattern, *m;
45 while ((m = *p++) != NULL) {
46 int len = strlen(m);
47 if (len > reflen)
48 continue;
49 if (memcmp(m, refname + reflen - len, len))
50 continue;
51 if (len == reflen)
52 goto match;
53 /* "--verify" requires an exact match */
54 if (verify)
55 continue;
56 if (refname[reflen - len - 1] == '/')
57 goto match;
58 }
59 return 0;
60 }
61
62 match:
63 found_match++;
64
65 /* This changes the semantics slightly that even under quiet we
66 * detect and return error if the repository is corrupt and
67 * ref points at a nonexistent object.
68 */
69 if (!has_sha1_file(sha1))
70 die("git show-ref: bad ref %s (%s)", refname,
71 sha1_to_hex(sha1));
72
73 if (quiet)
74 return 0;
75
76 show_one(refname, sha1);
77
78 if (!deref_tags)
79 return 0;
80
81 if (!peel_ref(refname, peeled)) {
82 hex = find_unique_abbrev(peeled, abbrev);
83 printf("%s %s^{}\n", hex, refname);
84 }
85 return 0;
86 }
87
88 static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
89 {
90 struct string_list *list = (struct string_list *)cbdata;
91 string_list_insert(list, refname);
92 return 0;
93 }
94
95 /*
96 * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
97 * and
98 * (1) strip "^{}" at the end of line if any;
99 * (2) ignore if match is provided and does not head-match refname;
100 * (3) warn if refname is not a well-formed refname and skip;
101 * (4) ignore if refname is a ref that exists in the local repository;
102 * (5) otherwise output the line.
103 */
104 static int exclude_existing(const char *match)
105 {
106 static struct string_list existing_refs = STRING_LIST_INIT_NODUP;
107 char buf[1024];
108 int matchlen = match ? strlen(match) : 0;
109
110 for_each_ref(add_existing, &existing_refs);
111 while (fgets(buf, sizeof(buf), stdin)) {
112 char *ref;
113 int len = strlen(buf);
114
115 if (len > 0 && buf[len - 1] == '\n')
116 buf[--len] = '\0';
117 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
118 len -= 3;
119 buf[len] = '\0';
120 }
121 for (ref = buf + len; buf < ref; ref--)
122 if (isspace(ref[-1]))
123 break;
124 if (match) {
125 int reflen = buf + len - ref;
126 if (reflen < matchlen)
127 continue;
128 if (strncmp(ref, match, matchlen))
129 continue;
130 }
131 if (check_refname_format(ref, 0)) {
132 warning("ref '%s' ignored", ref);
133 continue;
134 }
135 if (!string_list_has_string(&existing_refs, ref)) {
136 printf("%s\n", buf);
137 }
138 }
139 return 0;
140 }
141
142 static int hash_callback(const struct option *opt, const char *arg, int unset)
143 {
144 hash_only = 1;
145 /* Use full length SHA1 if no argument */
146 if (!arg)
147 return 0;
148 return parse_opt_abbrev_cb(opt, arg, unset);
149 }
150
151 static int exclude_existing_callback(const struct option *opt, const char *arg,
152 int unset)
153 {
154 exclude_arg = 1;
155 *(const char **)opt->value = arg;
156 return 0;
157 }
158
159 static int help_callback(const struct option *opt, const char *arg, int unset)
160 {
161 return -1;
162 }
163
164 static const struct option show_ref_options[] = {
165 OPT_BOOLEAN(0, "tags", &tags_only, N_("only show tags (can be combined with heads)")),
166 OPT_BOOLEAN(0, "heads", &heads_only, N_("only show heads (can be combined with tags)")),
167 OPT_BOOLEAN(0, "verify", &verify, N_("stricter reference checking, "
168 "requires exact ref path")),
169 { OPTION_BOOLEAN, 'h', NULL, &show_head, NULL,
170 N_("show the HEAD reference"),
171 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
172 OPT_BOOLEAN(0, "head", &show_head, N_("show the HEAD reference")),
173 OPT_BOOLEAN('d', "dereference", &deref_tags,
174 N_("dereference tags into object IDs")),
175 { OPTION_CALLBACK, 's', "hash", &abbrev, N_("n"),
176 N_("only show SHA1 hash using <n> digits"),
177 PARSE_OPT_OPTARG, &hash_callback },
178 OPT__ABBREV(&abbrev),
179 OPT__QUIET(&quiet,
180 N_("do not print results to stdout (useful with --verify)")),
181 { OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg,
182 N_("pattern"), N_("show refs from stdin that aren't in local repository"),
183 PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback },
184 { OPTION_CALLBACK, 0, "help-all", NULL, NULL, N_("show usage"),
185 PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
186 OPT_END()
187 };
188
189 int cmd_show_ref(int argc, const char **argv, const char *prefix)
190 {
191 if (argc == 2 && !strcmp(argv[1], "-h"))
192 usage_with_options(show_ref_usage, show_ref_options);
193
194 argc = parse_options(argc, argv, prefix, show_ref_options,
195 show_ref_usage, PARSE_OPT_NO_INTERNAL_HELP);
196
197 if (exclude_arg)
198 return exclude_existing(exclude_existing_arg);
199
200 pattern = argv;
201 if (!*pattern)
202 pattern = NULL;
203
204 if (verify) {
205 if (!pattern)
206 die("--verify requires a reference");
207 while (*pattern) {
208 unsigned char sha1[20];
209
210 if (!prefixcmp(*pattern, "refs/") &&
211 !read_ref(*pattern, sha1)) {
212 if (!quiet)
213 show_one(*pattern, sha1);
214 }
215 else if (!quiet)
216 die("'%s' - not a valid ref", *pattern);
217 else
218 return 1;
219 pattern++;
220 }
221 return 0;
222 }
223
224 if (show_head)
225 head_ref(show_ref, NULL);
226 for_each_ref(show_ref, NULL);
227 if (!found_match) {
228 if (verify && !quiet)
229 die("No match");
230 return 1;
231 }
232 return 0;
233 }