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>
14 static const char builtin_verify_tag_usage[] =
15 "git-verify-tag [-v|--verbose] <tag>...";
17 #define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
19 static 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;
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);
36 /* find the length without signature */
37 len = 0;
38 while (len < size && prefixcmp(buf + len, PGP_SIGNATURE)) {
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);
45 memset(&gpg, 0, sizeof(gpg));
46 gpg.argv = args_gpg;
47 gpg.in = -1;
48 gpg.out = 1;
49 args_gpg[2] = path;
50 if (start_command(&gpg))
51 return error("could not run gpg.");
53 write_in_full(gpg.in, buf, len);
54 close(gpg.in);
55 ret = finish_command(&gpg);
57 unlink(path);
59 return ret;
60 }
62 static int verify_tag(const char *name, int verbose)
63 {
64 enum object_type type;
65 unsigned char sha1[20];
66 char *buf;
67 unsigned long size;
68 int ret;
70 if (get_sha1(name, sha1))
71 return error("tag '%s' not found.", name);
73 type = sha1_object_info(sha1, NULL);
74 if (type != OBJ_TAG)
75 return error("%s: cannot verify a non-tag object of type %s.",
76 name, typename(type));
78 buf = read_sha1_file(sha1, &type, &size);
79 if (!buf)
80 return error("%s: unable to read file.", name);
82 ret = run_gpg_verify(buf, size, verbose);
84 free(buf);
85 return ret;
86 }
88 int cmd_verify_tag(int argc, const char **argv, const char *prefix)
89 {
90 int i = 1, verbose = 0, had_error = 0;
92 git_config(git_default_config);
94 if (argc == 1)
95 usage(builtin_verify_tag_usage);
97 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--verbose")) {
98 verbose = 1;
99 i++;
100 }
102 /* sometimes the program was terminated because this signal
103 * was received in the process of writing the gpg input: */
104 signal(SIGPIPE, SIG_IGN);
105 while (i < argc)
106 if (verify_tag(argv[i++], verbose))
107 had_error = 1;
108 return had_error;
109 }