Split GPG interface into its own helper library
[git/git.git] / builtin / verify-tag.c
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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>
4855b2a2 13#include "parse-options.h"
2f47eae2 14#include "gpg-interface.h"
2ae68fcb 15
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16static const char * const verify_tag_usage[] = {
17 "git verify-tag [-v|--verbose] <tag>...",
18 NULL
19};
2ae68fcb 20
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21static int run_gpg_verify(const char *buf, unsigned long size, int verbose)
22{
2f47eae2 23 int len;
2ae68fcb 24
ac58c4c7 25 len = parse_signature(buf, size);
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26 if (verbose)
27 write_in_full(1, buf, len);
28
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29 if (size == len)
30 return error("no signature found");
2ae68fcb 31
2f47eae2 32 return verify_signed_buffer(buf, len, buf + len, size - len, NULL);
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33}
34
35static 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
61int cmd_verify_tag(int argc, const char **argv, const char *prefix)
62{
63 int i = 1, verbose = 0, had_error = 0;
4855b2a2 64 const struct option verify_tag_options[] = {
6e565345 65 OPT__VERBOSE(&verbose, "print tag contents"),
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66 OPT_END()
67 };
2ae68fcb 68
ef90d6d4 69 git_config(git_default_config, NULL);
2ae68fcb 70
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71 argc = parse_options(argc, argv, prefix, verify_tag_options,
72 verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
d2761895 73 if (argc <= i)
4855b2a2 74 usage_with_options(verify_tag_usage, verify_tag_options);
d2761895 75
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76 /* sometimes the program was terminated because this signal
77 * was received in the process of writing the gpg input: */
78 signal(SIGPIPE, SIG_IGN);
79 while (i < argc)
80 if (verify_tag(argv[i++], verbose))
81 had_error = 1;
82 return had_error;
83}