Merge branch 'jc/fetch-refspec-doc-update' into maint
[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 "commit.h"
12 #include "run-command.h"
13 #include <signal.h>
14 #include "parse-options.h"
15 #include "gpg-interface.h"
16
17 static const char * const verify_commit_usage[] = {
18                 N_("git verify-commit [-v | --verbose] <commit>..."),
19                 NULL
20 };
21
22 static int run_gpg_verify(const struct object_id *oid, const char *buf, unsigned long size, unsigned flags)
23 {
24         struct signature_check signature_check;
25         int ret;
26
27         memset(&signature_check, 0, sizeof(signature_check));
28
29         ret = check_commit_signature(lookup_commit(oid), &signature_check);
30         print_signature_buffer(&signature_check, flags);
31
32         signature_check_clear(&signature_check);
33         return ret;
34 }
35
36 static int verify_commit(const char *name, unsigned flags)
37 {
38         enum object_type type;
39         struct object_id oid;
40         char *buf;
41         unsigned long size;
42         int ret;
43
44         if (get_oid(name, &oid))
45                 return error("commit '%s' not found.", name);
46
47         buf = read_sha1_file(oid.hash, &type, &size);
48         if (!buf)
49                 return error("%s: unable to read file.", name);
50         if (type != OBJ_COMMIT)
51                 return error("%s: cannot verify a non-commit object of type %s.",
52                                 name, typename(type));
53
54         ret = run_gpg_verify(&oid, buf, size, flags);
55
56         free(buf);
57         return ret;
58 }
59
60 static int git_verify_commit_config(const char *var, const char *value, void *cb)
61 {
62         int status = git_gpg_config(var, value, cb);
63         if (status)
64                 return status;
65         return git_default_config(var, value, cb);
66 }
67
68 int cmd_verify_commit(int argc, const char **argv, const char *prefix)
69 {
70         int i = 1, verbose = 0, had_error = 0;
71         unsigned flags = 0;
72         const struct option verify_commit_options[] = {
73                 OPT__VERBOSE(&verbose, N_("print commit contents")),
74                 OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
75                 OPT_END()
76         };
77
78         git_config(git_verify_commit_config, NULL);
79
80         argc = parse_options(argc, argv, prefix, verify_commit_options,
81                              verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
82         if (argc <= i)
83                 usage_with_options(verify_commit_usage, verify_commit_options);
84
85         if (verbose)
86                 flags |= GPG_VERIFY_VERBOSE;
87
88         /* sometimes the program was terminated because this signal
89          * was received in the process of writing the gpg input: */
90         signal(SIGPIPE, SIG_IGN);
91         while (i < argc)
92                 if (verify_commit(argv[i++], flags))
93                         had_error = 1;
94         return had_error;
95 }