Merge branch 'np/diff-in-corrupt-repository'
[git] / builtin / cat-file.c
1 /*
2  * GIT - The information manager from hell
3  *
4  * Copyright (C) Linus Torvalds, 2005
5  */
6 #include "cache.h"
7 #include "exec_cmd.h"
8 #include "tag.h"
9 #include "tree.h"
10 #include "builtin.h"
11 #include "parse-options.h"
12 #include "diff.h"
13 #include "userdiff.h"
14
15 #define BATCH 1
16 #define BATCH_CHECK 2
17
18 static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
19 {
20         /* the parser in tag.c is useless here. */
21         const char *endp = buf + size;
22         const char *cp = buf;
23
24         while (cp < endp) {
25                 char c = *cp++;
26                 if (c != '\n')
27                         continue;
28                 if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
29                         const char *tagger = cp;
30
31                         /* Found the tagger line.  Copy out the contents
32                          * of the buffer so far.
33                          */
34                         write_or_die(1, buf, cp - buf);
35
36                         /*
37                          * Do something intelligent, like pretty-printing
38                          * the date.
39                          */
40                         while (cp < endp) {
41                                 if (*cp++ == '\n') {
42                                         /* tagger to cp is a line
43                                          * that has ident and time.
44                                          */
45                                         const char *sp = tagger;
46                                         char *ep;
47                                         unsigned long date;
48                                         long tz;
49                                         while (sp < cp && *sp != '>')
50                                                 sp++;
51                                         if (sp == cp) {
52                                                 /* give up */
53                                                 write_or_die(1, tagger,
54                                                              cp - tagger);
55                                                 break;
56                                         }
57                                         while (sp < cp &&
58                                                !('0' <= *sp && *sp <= '9'))
59                                                 sp++;
60                                         write_or_die(1, tagger, sp - tagger);
61                                         date = strtoul(sp, &ep, 10);
62                                         tz = strtol(ep, NULL, 10);
63                                         sp = show_date(date, tz, 0);
64                                         write_or_die(1, sp, strlen(sp));
65                                         xwrite(1, "\n", 1);
66                                         break;
67                                 }
68                         }
69                         break;
70                 }
71                 if (cp < endp && *cp == '\n')
72                         /* end of header */
73                         break;
74         }
75         /* At this point, we have copied out the header up to the end of
76          * the tagger line and cp points at one past \n.  It could be the
77          * next header line after the tagger line, or it could be another
78          * \n that marks the end of the headers.  We need to copy out the
79          * remainder as is.
80          */
81         if (cp < endp)
82                 write_or_die(1, cp, endp - cp);
83 }
84
85 static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
86 {
87         unsigned char sha1[20];
88         enum object_type type;
89         char *buf;
90         unsigned long size;
91         struct object_context obj_context;
92
93         if (get_sha1_with_context(obj_name, sha1, &obj_context))
94                 die("Not a valid object name %s", obj_name);
95
96         buf = NULL;
97         switch (opt) {
98         case 't':
99                 type = sha1_object_info(sha1, NULL);
100                 if (type > 0) {
101                         printf("%s\n", typename(type));
102                         return 0;
103                 }
104                 break;
105
106         case 's':
107                 type = sha1_object_info(sha1, &size);
108                 if (type > 0) {
109                         printf("%lu\n", size);
110                         return 0;
111                 }
112                 break;
113
114         case 'e':
115                 return !has_sha1_file(sha1);
116
117         case 'p':
118                 type = sha1_object_info(sha1, NULL);
119                 if (type < 0)
120                         die("Not a valid object name %s", obj_name);
121
122                 /* custom pretty-print here */
123                 if (type == OBJ_TREE) {
124                         const char *ls_args[3] = { NULL };
125                         ls_args[0] =  "ls-tree";
126                         ls_args[1] =  obj_name;
127                         return cmd_ls_tree(2, ls_args, NULL);
128                 }
129
130                 buf = read_sha1_file(sha1, &type, &size);
131                 if (!buf)
132                         die("Cannot read object %s", obj_name);
133                 if (type == OBJ_TAG) {
134                         pprint_tag(sha1, buf, size);
135                         return 0;
136                 }
137
138                 /* otherwise just spit out the data */
139                 break;
140
141         case 'c':
142                 if (!obj_context.path[0])
143                         die("git cat-file --textconv %s: <object> must be <sha1:path>",
144                             obj_name);
145
146                 if (!textconv_object(obj_context.path, obj_context.mode, sha1, &buf, &size))
147                         die("git cat-file --textconv: unable to run textconv on %s",
148                             obj_name);
149                 break;
150
151         case 0:
152                 buf = read_object_with_reference(sha1, exp_type, &size, NULL);
153                 break;
154
155         default:
156                 die("git cat-file: unknown option: %s", exp_type);
157         }
158
159         if (!buf)
160                 die("git cat-file %s: bad file", obj_name);
161
162         write_or_die(1, buf, size);
163         return 0;
164 }
165
166 static int batch_one_object(const char *obj_name, int print_contents)
167 {
168         unsigned char sha1[20];
169         enum object_type type = 0;
170         unsigned long size;
171         void *contents = contents;
172
173         if (!obj_name)
174            return 1;
175
176         if (get_sha1(obj_name, sha1)) {
177                 printf("%s missing\n", obj_name);
178                 fflush(stdout);
179                 return 0;
180         }
181
182         if (print_contents == BATCH)
183                 contents = read_sha1_file(sha1, &type, &size);
184         else
185                 type = sha1_object_info(sha1, &size);
186
187         if (type <= 0) {
188                 printf("%s missing\n", obj_name);
189                 fflush(stdout);
190                 return 0;
191         }
192
193         printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size);
194         fflush(stdout);
195
196         if (print_contents == BATCH) {
197                 write_or_die(1, contents, size);
198                 printf("\n");
199                 fflush(stdout);
200                 free(contents);
201         }
202
203         return 0;
204 }
205
206 static int batch_objects(int print_contents)
207 {
208         struct strbuf buf = STRBUF_INIT;
209
210         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
211                 int error = batch_one_object(buf.buf, print_contents);
212                 if (error)
213                         return error;
214         }
215
216         return 0;
217 }
218
219 static const char * const cat_file_usage[] = {
220         "git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>",
221         "git cat-file (--batch|--batch-check) < <list_of_objects>",
222         NULL
223 };
224
225 static int git_cat_file_config(const char *var, const char *value, void *cb)
226 {
227         switch (userdiff_config(var, value)) {
228         case 0:
229                 break;
230         case -1:
231                 return -1;
232         default:
233                 return 0;
234         }
235
236         return git_default_config(var, value, cb);
237 }
238
239 int cmd_cat_file(int argc, const char **argv, const char *prefix)
240 {
241         int opt = 0, batch = 0;
242         const char *exp_type = NULL, *obj_name = NULL;
243
244         const struct option options[] = {
245                 OPT_GROUP("<type> can be one of: blob, tree, commit, tag"),
246                 OPT_SET_INT('t', NULL, &opt, "show object type", 't'),
247                 OPT_SET_INT('s', NULL, &opt, "show object size", 's'),
248                 OPT_SET_INT('e', NULL, &opt,
249                             "exit with zero when there's no error", 'e'),
250                 OPT_SET_INT('p', NULL, &opt, "pretty-print object's content", 'p'),
251                 OPT_SET_INT(0, "textconv", &opt,
252                             "for blob objects, run textconv on object's content", 'c'),
253                 OPT_SET_INT(0, "batch", &batch,
254                             "show info and content of objects fed from the standard input",
255                             BATCH),
256                 OPT_SET_INT(0, "batch-check", &batch,
257                             "show info about objects fed from the standard input",
258                             BATCH_CHECK),
259                 OPT_END()
260         };
261
262         git_config(git_cat_file_config, NULL);
263
264         if (argc != 3 && argc != 2)
265                 usage_with_options(cat_file_usage, options);
266
267         argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
268
269         if (opt) {
270                 if (argc == 1)
271                         obj_name = argv[0];
272                 else
273                         usage_with_options(cat_file_usage, options);
274         }
275         if (!opt && !batch) {
276                 if (argc == 2) {
277                         exp_type = argv[0];
278                         obj_name = argv[1];
279                 } else
280                         usage_with_options(cat_file_usage, options);
281         }
282         if (batch && (opt || argc)) {
283                 usage_with_options(cat_file_usage, options);
284         }
285
286         if (batch)
287                 return batch_objects(batch);
288
289         return cat_one_file(opt, exp_type, obj_name);
290 }