Merge branch 'jn/fast-import-ondemand-checkpoint'
[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
15 static const char * const verify_tag_usage[] = {
16                 "git verify-tag [-v|--verbose] <tag>...",
17                 NULL
18 };
19
20 static int run_gpg_verify(const char *buf, unsigned long size, int verbose)
21 {
22         struct child_process gpg;
23         const char *args_gpg[] = {"gpg", "--verify", "FILE", "-", NULL};
24         char path[PATH_MAX];
25         size_t len;
26         int fd, ret;
27
28         fd = git_mkstemp(path, PATH_MAX, ".git_vtag_tmpXXXXXX");
29         if (fd < 0)
30                 return error("could not create temporary file '%s': %s",
31                                                 path, strerror(errno));
32         if (write_in_full(fd, buf, size) < 0)
33                 return error("failed writing temporary file '%s': %s",
34                                                 path, strerror(errno));
35         close(fd);
36
37         /* find the length without signature */
38         len = parse_signature(buf, size);
39         if (verbose)
40                 write_in_full(1, buf, len);
41
42         memset(&gpg, 0, sizeof(gpg));
43         gpg.argv = args_gpg;
44         gpg.in = -1;
45         args_gpg[2] = path;
46         if (start_command(&gpg)) {
47                 unlink(path);
48                 return error("could not run gpg.");
49         }
50
51         write_in_full(gpg.in, buf, len);
52         close(gpg.in);
53         ret = finish_command(&gpg);
54
55         unlink_or_warn(path);
56
57         return ret;
58 }
59
60 static int verify_tag(const char *name, int verbose)
61 {
62         enum object_type type;
63         unsigned char sha1[20];
64         char *buf;
65         unsigned long size;
66         int ret;
67
68         if (get_sha1(name, sha1))
69                 return error("tag '%s' not found.", name);
70
71         type = sha1_object_info(sha1, NULL);
72         if (type != OBJ_TAG)
73                 return error("%s: cannot verify a non-tag object of type %s.",
74                                 name, typename(type));
75
76         buf = read_sha1_file(sha1, &type, &size);
77         if (!buf)
78                 return error("%s: unable to read file.", name);
79
80         ret = run_gpg_verify(buf, size, verbose);
81
82         free(buf);
83         return ret;
84 }
85
86 int cmd_verify_tag(int argc, const char **argv, const char *prefix)
87 {
88         int i = 1, verbose = 0, had_error = 0;
89         const struct option verify_tag_options[] = {
90                 OPT__VERBOSE(&verbose, "print tag contents"),
91                 OPT_END()
92         };
93
94         git_config(git_default_config, NULL);
95
96         argc = parse_options(argc, argv, prefix, verify_tag_options,
97                              verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
98         if (argc <= i)
99                 usage_with_options(verify_tag_usage, verify_tag_options);
100
101         /* sometimes the program was terminated because this signal
102          * was received in the process of writing the gpg input: */
103         signal(SIGPIPE, SIG_IGN);
104         while (i < argc)
105                 if (verify_tag(argv[i++], verbose))
106                         had_error = 1;
107         return had_error;
108 }