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