gitweb: use new Git::Repo API, and add optional caching
[git/gitweb-caching.git] / builtin-verify-tag.c
blob729a1593e61d87ad4596f07e7faedac81de64e81
1 /*
2 * Builtin "git verify-tag"
4 * Copyright (c) 2007 Carlos Rica <jasampler@gmail.com>
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)
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;
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 args_gpg[2] = path;
49 if (start_command(&gpg)) {
50 unlink(path);
51 return error("could not run gpg.");
54 write_in_full(gpg.in, buf, len);
55 close(gpg.in);
56 ret = finish_command(&gpg);
58 unlink(path);
60 return ret;
63 static int verify_tag(const char *name, int verbose)
65 enum object_type type;
66 unsigned char sha1[20];
67 char *buf;
68 unsigned long size;
69 int ret;
71 if (get_sha1(name, sha1))
72 return error("tag '%s' not found.", name);
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));
79 buf = read_sha1_file(sha1, &type, &size);
80 if (!buf)
81 return error("%s: unable to read file.", name);
83 ret = run_gpg_verify(buf, size, verbose);
85 free(buf);
86 return ret;
89 int cmd_verify_tag(int argc, const char **argv, const char *prefix)
91 int i = 1, verbose = 0, had_error = 0;
93 git_config(git_default_config, NULL);
95 if (argc > 1 &&
96 (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--verbose"))) {
97 verbose = 1;
98 i++;
101 if (argc <= i)
102 usage(builtin_verify_tag_usage);
104 /* sometimes the program was terminated because this signal
105 * was received in the process of writing the gpg input: */
106 signal(SIGPIPE, SIG_IGN);
107 while (i < argc)
108 if (verify_tag(argv[i++], verbose))
109 had_error = 1;
110 return had_error;