path.c: and an option to call real_path() in expand_user_path()
[git] / builtin / verify-commit.c
1 /*
2  * Builtin "git commit-commit"
3  *
4  * Copyright (c) 2014 Michael J Gruber <git@drmicha.warpmail.net>
5  *
6  * Based on git-verify-tag
7  */
8 #include "cache.h"
9 #include "builtin.h"
10 #include "commit.h"
11 #include "run-command.h"
12 #include <signal.h>
13 #include "parse-options.h"
14 #include "gpg-interface.h"
15
16 static const char * const verify_commit_usage[] = {
17                 N_("git verify-commit [-v | --verbose] <commit>..."),
18                 NULL
19 };
20
21 static int run_gpg_verify(const unsigned char *sha1, const char *buf, unsigned long size, unsigned flags)
22 {
23         struct signature_check signature_check;
24         int ret;
25
26         memset(&signature_check, 0, sizeof(signature_check));
27
28         ret = check_commit_signature(lookup_commit(sha1), &signature_check);
29         print_signature_buffer(&signature_check, flags);
30
31         signature_check_clear(&signature_check);
32         return ret;
33 }
34
35 static int verify_commit(const char *name, unsigned flags)
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("commit '%s' not found.", name);
45
46         buf = read_sha1_file(sha1, &type, &size);
47         if (!buf)
48                 return error("%s: unable to read file.", name);
49         if (type != OBJ_COMMIT)
50                 return error("%s: cannot verify a non-commit object of type %s.",
51                                 name, typename(type));
52
53         ret = run_gpg_verify(sha1, buf, size, flags);
54
55         free(buf);
56         return ret;
57 }
58
59 static int git_verify_commit_config(const char *var, const char *value, void *cb)
60 {
61         int status = git_gpg_config(var, value, cb);
62         if (status)
63                 return status;
64         return git_default_config(var, value, cb);
65 }
66
67 int cmd_verify_commit(int argc, const char **argv, const char *prefix)
68 {
69         int i = 1, verbose = 0, had_error = 0;
70         unsigned flags = 0;
71         const struct option verify_commit_options[] = {
72                 OPT__VERBOSE(&verbose, N_("print commit contents")),
73                 OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
74                 OPT_END()
75         };
76
77         git_config(git_verify_commit_config, NULL);
78
79         argc = parse_options(argc, argv, prefix, verify_commit_options,
80                              verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
81         if (argc <= i)
82                 usage_with_options(verify_commit_usage, verify_commit_options);
83
84         if (verbose)
85                 flags |= GPG_VERIFY_VERBOSE;
86
87         /* sometimes the program was terminated because this signal
88          * was received in the process of writing the gpg input: */
89         signal(SIGPIPE, SIG_IGN);
90         while (i < argc)
91                 if (verify_commit(argv[i++], flags))
92                         had_error = 1;
93         return had_error;
94 }