receive-pack: use strict mode for unpacking objects
[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 "path-list.h"
7
8 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";
9
10 static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
11         found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
12 static const char **pattern;
13
14 static void show_one(const char *refname, const unsigned char *sha1)
15 {
16         const char *hex = find_unique_abbrev(sha1, abbrev);
17         if (hash_only)
18                 printf("%s\n", hex);
19         else
20                 printf("%s %s\n", hex, refname);
21 }
22
23 static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
24 {
25         struct object *obj;
26         const char *hex;
27         unsigned char peeled[20];
28
29         if (tags_only || heads_only) {
30                 int match;
31
32                 match = heads_only && !prefixcmp(refname, "refs/heads/");
33                 match |= tags_only && !prefixcmp(refname, "refs/tags/");
34                 if (!match)
35                         return 0;
36         }
37         if (pattern) {
38                 int reflen = strlen(refname);
39                 const char **p = pattern, *m;
40                 while ((m = *p++) != NULL) {
41                         int len = strlen(m);
42                         if (len > reflen)
43                                 continue;
44                         if (memcmp(m, refname + reflen - len, len))
45                                 continue;
46                         if (len == reflen)
47                                 goto match;
48                         /* "--verify" requires an exact match */
49                         if (verify)
50                                 continue;
51                         if (refname[reflen - len - 1] == '/')
52                                 goto match;
53                 }
54                 return 0;
55         }
56
57 match:
58         found_match++;
59
60         /* This changes the semantics slightly that even under quiet we
61          * detect and return error if the repository is corrupt and
62          * ref points at a nonexistent object.
63          */
64         if (!has_sha1_file(sha1))
65                 die("git-show-ref: bad ref %s (%s)", refname,
66                     sha1_to_hex(sha1));
67
68         if (quiet)
69                 return 0;
70
71         show_one(refname, sha1);
72
73         if (!deref_tags)
74                 return 0;
75
76         if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
77                 if (!is_null_sha1(peeled)) {
78                         hex = find_unique_abbrev(peeled, abbrev);
79                         printf("%s %s^{}\n", hex, refname);
80                 }
81         }
82         else {
83                 obj = parse_object(sha1);
84                 if (!obj)
85                         die("git-show-ref: bad ref %s (%s)", refname,
86                             sha1_to_hex(sha1));
87                 if (obj->type == OBJ_TAG) {
88                         obj = deref_tag(obj, refname, 0);
89                         hex = find_unique_abbrev(obj->sha1, abbrev);
90                         printf("%s %s^{}\n", hex, refname);
91                 }
92         }
93         return 0;
94 }
95
96 static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
97 {
98         struct path_list *list = (struct path_list *)cbdata;
99         path_list_insert(refname, list);
100         return 0;
101 }
102
103 /*
104  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
105  * and
106  * (1) strip "^{}" at the end of line if any;
107  * (2) ignore if match is provided and does not head-match refname;
108  * (3) warn if refname is not a well-formed refname and skip;
109  * (4) ignore if refname is a ref that exists in the local repository;
110  * (5) otherwise output the line.
111  */
112 static int exclude_existing(const char *match)
113 {
114         static struct path_list existing_refs = { NULL, 0, 0, 0 };
115         char buf[1024];
116         int matchlen = match ? strlen(match) : 0;
117
118         for_each_ref(add_existing, &existing_refs);
119         while (fgets(buf, sizeof(buf), stdin)) {
120                 char *ref;
121                 int len = strlen(buf);
122
123                 if (len > 0 && buf[len - 1] == '\n')
124                         buf[--len] = '\0';
125                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
126                         len -= 3;
127                         buf[len] = '\0';
128                 }
129                 for (ref = buf + len; buf < ref; ref--)
130                         if (isspace(ref[-1]))
131                                 break;
132                 if (match) {
133                         int reflen = buf + len - ref;
134                         if (reflen < matchlen)
135                                 continue;
136                         if (strncmp(ref, match, matchlen))
137                                 continue;
138                 }
139                 if (check_ref_format(ref)) {
140                         fprintf(stderr, "warning: ref '%s' ignored\n", ref);
141                         continue;
142                 }
143                 if (!path_list_has_path(&existing_refs, ref)) {
144                         printf("%s\n", buf);
145                 }
146         }
147         return 0;
148 }
149
150 int cmd_show_ref(int argc, const char **argv, const char *prefix)
151 {
152         int i;
153
154         for (i = 1; i < argc; i++) {
155                 const char *arg = argv[i];
156                 if (*arg != '-') {
157                         pattern = argv + i;
158                         break;
159                 }
160                 if (!strcmp(arg, "--")) {
161                         pattern = argv + i + 1;
162                         if (!*pattern)
163                                 pattern = NULL;
164                         break;
165                 }
166                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
167                         quiet = 1;
168                         continue;
169                 }
170                 if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
171                         show_head = 1;
172                         continue;
173                 }
174                 if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
175                         deref_tags = 1;
176                         continue;
177                 }
178                 if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
179                         hash_only = 1;
180                         continue;
181                 }
182                 if (!prefixcmp(arg, "--hash=") ||
183                     (!prefixcmp(arg, "--abbrev") &&
184                      (arg[8] == '=' || arg[8] == '\0'))) {
185                         if (arg[2] != 'h' && !arg[8])
186                                 /* --abbrev only */
187                                 abbrev = DEFAULT_ABBREV;
188                         else {
189                                 /* --hash= or --abbrev= */
190                                 char *end;
191                                 if (arg[2] == 'h') {
192                                         hash_only = 1;
193                                         arg += 7;
194                                 }
195                                 else
196                                         arg += 9;
197                                 abbrev = strtoul(arg, &end, 10);
198                                 if (*end || abbrev > 40)
199                                         usage(show_ref_usage);
200                                 if (abbrev < MINIMUM_ABBREV)
201                                         abbrev = MINIMUM_ABBREV;
202                         }
203                         continue;
204                 }
205                 if (!strcmp(arg, "--verify")) {
206                         verify = 1;
207                         continue;
208                 }
209                 if (!strcmp(arg, "--tags")) {
210                         tags_only = 1;
211                         continue;
212                 }
213                 if (!strcmp(arg, "--heads")) {
214                         heads_only = 1;
215                         continue;
216                 }
217                 if (!strcmp(arg, "--exclude-existing"))
218                         return exclude_existing(NULL);
219                 if (!prefixcmp(arg, "--exclude-existing="))
220                         return exclude_existing(arg + 19);
221                 usage(show_ref_usage);
222         }
223
224         if (verify) {
225                 if (!pattern)
226                         die("--verify requires a reference");
227                 while (*pattern) {
228                         unsigned char sha1[20];
229
230                         if (!prefixcmp(*pattern, "refs/") &&
231                             resolve_ref(*pattern, sha1, 1, NULL)) {
232                                 if (!quiet)
233                                         show_one(*pattern, sha1);
234                         }
235                         else if (!quiet)
236                                 die("'%s' - not a valid ref", *pattern);
237                         else
238                                 return 1;
239                         pattern++;
240                 }
241                 return 0;
242         }
243
244         if (show_head)
245                 head_ref(show_ref, NULL);
246         for_each_ref(show_ref, NULL);
247         if (!found_match) {
248                 if (verify && !quiet)
249                         die("No match");
250                 return 1;
251         }
252         return 0;
253 }