Merge branch 'as/api-allocation-doc'
[git] / builtin / verify-tag.c
1 /*
2  * Builtin "git verify-tag"
3  *
4  * Copyright (c) 2007 Carlos Rica <jasampler@gmail.com>
5  *
6  * Based on git-verify-tag.sh
7  */
8 #include "cache.h"
9 #include "builtin.h"
10 #include "tag.h"
11 #include "run-command.h"
12 #include <signal.h>
13 #include "parse-options.h"
14 #include "gpg-interface.h"
15
16 static const char * const verify_tag_usage[] = {
17                 N_("git verify-tag [-v|--verbose] <tag>..."),
18                 NULL
19 };
20
21 static int run_gpg_verify(const char *buf, unsigned long size, int verbose)
22 {
23         int len;
24
25         len = parse_signature(buf, size);
26         if (verbose)
27                 write_in_full(1, buf, len);
28
29         if (size == len)
30                 return error("no signature found");
31
32         return verify_signed_buffer(buf, len, buf + len, size - len, NULL);
33 }
34
35 static int verify_tag(const char *name, int verbose)
36 {
37         enum object_type type;
38         unsigned char sha1[20];
39         char *buf;
40         unsigned long size;
41         int ret;
42
43         if (get_sha1(name, sha1))
44                 return error("tag '%s' not found.", name);
45
46         type = sha1_object_info(sha1, NULL);
47         if (type != OBJ_TAG)
48                 return error("%s: cannot verify a non-tag object of type %s.",
49                                 name, typename(type));
50
51         buf = read_sha1_file(sha1, &type, &size);
52         if (!buf)
53                 return error("%s: unable to read file.", name);
54
55         ret = run_gpg_verify(buf, size, verbose);
56
57         free(buf);
58         return ret;
59 }
60
61 static int git_verify_tag_config(const char *var, const char *value, void *cb)
62 {
63         int status = git_gpg_config(var, value, cb);
64         if (status)
65                 return status;
66         return git_default_config(var, value, cb);
67 }
68
69 int cmd_verify_tag(int argc, const char **argv, const char *prefix)
70 {
71         int i = 1, verbose = 0, had_error = 0;
72         const struct option verify_tag_options[] = {
73                 OPT__VERBOSE(&verbose, N_("print tag contents")),
74                 OPT_END()
75         };
76
77         git_config(git_verify_tag_config, NULL);
78
79         argc = parse_options(argc, argv, prefix, verify_tag_options,
80                              verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
81         if (argc <= i)
82                 usage_with_options(verify_tag_usage, verify_tag_options);
83
84         /* sometimes the program was terminated because this signal
85          * was received in the process of writing the gpg input: */
86         signal(SIGPIPE, SIG_IGN);
87         while (i < argc)
88                 if (verify_tag(argv[i++], verbose))
89                         had_error = 1;
90         return had_error;
91 }