Merge branch 'bb/pedantic'
[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 "config.h"
10 #include "builtin.h"
11 #include "object-store.h"
12 #include "commit.h"
13 #include "run-command.h"
14 #include <signal.h>
15 #include "parse-options.h"
16 #include "gpg-interface.h"
17
18 static const char * const verify_commit_usage[] = {
19                 N_("git verify-commit [-v | --verbose] <commit>..."),
20                 NULL
21 };
22
23 static int run_gpg_verify(const struct object_id *oid, const char *buf, unsigned long size, unsigned flags)
24 {
25         struct signature_check signature_check;
26         int ret;
27
28         memset(&signature_check, 0, sizeof(signature_check));
29
30         ret = check_commit_signature(lookup_commit(oid), &signature_check);
31         print_signature_buffer(&signature_check, flags);
32
33         signature_check_clear(&signature_check);
34         return ret;
35 }
36
37 static int verify_commit(const char *name, unsigned flags)
38 {
39         enum object_type type;
40         struct object_id oid;
41         char *buf;
42         unsigned long size;
43         int ret;
44
45         if (get_oid(name, &oid))
46                 return error("commit '%s' not found.", name);
47
48         buf = read_object_file(&oid, &type, &size);
49         if (!buf)
50                 return error("%s: unable to read file.", name);
51         if (type != OBJ_COMMIT)
52                 return error("%s: cannot verify a non-commit object of type %s.",
53                                 name, type_name(type));
54
55         ret = run_gpg_verify(&oid, buf, size, flags);
56
57         free(buf);
58         return ret;
59 }
60
61 static int git_verify_commit_config(const char *var, const char *value, void *cb)
62 {
63         int status = git_gpg_config(var, value, cb);
64         if (status)
65                 return status;
66         return git_default_config(var, value, cb);
67 }
68
69 int cmd_verify_commit(int argc, const char **argv, const char *prefix)
70 {
71         int i = 1, verbose = 0, had_error = 0;
72         unsigned flags = 0;
73         const struct option verify_commit_options[] = {
74                 OPT__VERBOSE(&verbose, N_("print commit contents")),
75                 OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
76                 OPT_END()
77         };
78
79         git_config(git_verify_commit_config, NULL);
80
81         argc = parse_options(argc, argv, prefix, verify_commit_options,
82                              verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
83         if (argc <= i)
84                 usage_with_options(verify_commit_usage, verify_commit_options);
85
86         if (verbose)
87                 flags |= GPG_VERIFY_VERBOSE;
88
89         /* sometimes the program was terminated because this signal
90          * was received in the process of writing the gpg input: */
91         signal(SIGPIPE, SIG_IGN);
92         while (i < argc)
93                 if (verify_commit(argv[i++], flags))
94                         had_error = 1;
95         return had_error;
96 }