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 }