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 "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(the_repository, oid),
  31                                      &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         enum object_type type;
  41         struct object_id oid;
  42         char *buf;
  43         unsigned long size;
  44         int ret;
  45
  46         if (get_oid(name, &oid))
  47                 return error("commit '%s' not found.", name);
  48
  49         buf = read_object_file(&oid, &type, &size);
  50         if (!buf)
  51                 return error("%s: unable to read file.", name);
  52         if (type != OBJ_COMMIT)
  53                 return error("%s: cannot verify a non-commit object of type %s.",
  54                                 name, type_name(type));
  55
  56         ret = run_gpg_verify(&oid, buf, size, flags);
  57
  58         free(buf);
  59         return ret;
  60 }
  61
  62 static int git_verify_commit_config(const char *var, const char *value, void *cb)
  63 {
  64         int status = git_gpg_config(var, value, cb);
  65         if (status)
  66                 return status;
  67         return git_default_config(var, value, cb);
  68 }
  69
  70 int cmd_verify_commit(int argc, const char **argv, const char *prefix)
  71 {
  72         int i = 1, verbose = 0, had_error = 0;
  73         unsigned flags = 0;
  74         const struct option verify_commit_options[] = {
  75                 OPT__VERBOSE(&verbose, N_("print commit contents")),
  76                 OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
  77                 OPT_END()
  78         };
  79
  80         git_config(git_verify_commit_config, NULL);
  81
  82         argc = parse_options(argc, argv, prefix, verify_commit_options,
  83                              verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
  84         if (argc <= i)
  85                 usage_with_options(verify_commit_usage, verify_commit_options);
  86
  87         if (verbose)
  88                 flags |= GPG_VERIFY_VERBOSE;
  89
  90         /* sometimes the program was terminated because this signal
  91          * was received in the process of writing the gpg input: */
  92         signal(SIGPIPE, SIG_IGN);
  93         while (i < argc)
  94                 if (verify_commit(argv[i++], flags))
  95                         had_error = 1;
  96         return had_error;
  97 }