ls-tree documentation: enhance notes on subdirectory and pathspec behaviour
[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>
13
14static const char builtin_verify_tag_usage[] =
1b1dd23f 15 "git verify-tag [-v|--verbose] <tag>...";
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16
17#define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
18
19static int run_gpg_verify(const char *buf, unsigned long size, int verbose)
20{
21 struct child_process gpg;
22 const char *args_gpg[] = {"gpg", "--verify", "FILE", "-", NULL};
23 char path[PATH_MAX], *eol;
24 size_t len;
25 int fd, ret;
26
27 fd = git_mkstemp(path, PATH_MAX, ".git_vtag_tmpXXXXXX");
28 if (fd < 0)
29 return error("could not create temporary file '%s': %s",
30 path, strerror(errno));
31 if (write_in_full(fd, buf, size) < 0)
32 return error("failed writing temporary file '%s': %s",
33 path, strerror(errno));
34 close(fd);
35
36 /* find the length without signature */
37 len = 0;
fec60a26 38 while (len < size && prefixcmp(buf + len, PGP_SIGNATURE)) {
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39 eol = memchr(buf + len, '\n', size - len);
40 len += eol ? eol - (buf + len) + 1 : size - len;
41 }
42 if (verbose)
43 write_in_full(1, buf, len);
44
45 memset(&gpg, 0, sizeof(gpg));
46 gpg.argv = args_gpg;
47 gpg.in = -1;
2ae68fcb 48 args_gpg[2] = path;
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49 if (start_command(&gpg)) {
50 unlink(path);
2ae68fcb 51 return error("could not run gpg.");
69fe5ef6 52 }
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53
54 write_in_full(gpg.in, buf, len);
55 close(gpg.in);
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56 ret = finish_command(&gpg);
57
58 unlink(path);
59
60 return ret;
61}
62
63static int verify_tag(const char *name, int verbose)
64{
65 enum object_type type;
66 unsigned char sha1[20];
67 char *buf;
68 unsigned long size;
69 int ret;
70
71 if (get_sha1(name, sha1))
72 return error("tag '%s' not found.", name);
73
74 type = sha1_object_info(sha1, NULL);
75 if (type != OBJ_TAG)
76 return error("%s: cannot verify a non-tag object of type %s.",
77 name, typename(type));
78
79 buf = read_sha1_file(sha1, &type, &size);
80 if (!buf)
81 return error("%s: unable to read file.", name);
82
83 ret = run_gpg_verify(buf, size, verbose);
84
85 free(buf);
86 return ret;
87}
88
89int cmd_verify_tag(int argc, const char **argv, const char *prefix)
90{
91 int i = 1, verbose = 0, had_error = 0;
92
ef90d6d4 93 git_config(git_default_config, NULL);
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94
95 if (argc == 1)
96 usage(builtin_verify_tag_usage);
97
98 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--verbose")) {
99 verbose = 1;
100 i++;
101 }
102
103 /* sometimes the program was terminated because this signal
104 * was received in the process of writing the gpg input: */
105 signal(SIGPIPE, SIG_IGN);
106 while (i < argc)
107 if (verify_tag(argv[i++], verbose))
108 had_error = 1;
109 return had_error;
110}