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2ae68fcb CR |
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 | ||
14 | static const char builtin_verify_tag_usage[] = | |
15 | "git-verify-tag [-v|--verbose] <tag>..."; | |
16 | ||
17 | #define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----" | |
18 | ||
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; | |
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)) { |
2ae68fcb CR |
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; | |
48 | gpg.out = 1; | |
49 | args_gpg[2] = path; | |
50 | if (start_command(&gpg)) | |
51 | return error("could not run gpg."); | |
52 | ||
53 | write_in_full(gpg.in, buf, len); | |
54 | close(gpg.in); | |
55 | gpg.close_in = 0; | |
56 | ret = finish_command(&gpg); | |
57 | ||
58 | unlink(path); | |
59 | ||
60 | return ret; | |
61 | } | |
62 | ||
63 | static 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 | ||
89 | int cmd_verify_tag(int argc, const char **argv, const char *prefix) | |
90 | { | |
91 | int i = 1, verbose = 0, had_error = 0; | |
92 | ||
93 | git_config(git_default_config); | |
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 | } |