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(const struct object_id *oid, const char *buf, unsigned long size, 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(lookup_commit(the_repository, oid),
  32                                      &signature_check);
  33         print_signature_buffer(&signature_check, flags);
  34
  35         signature_check_clear(&signature_check);
  36         return ret;
  37 }
  38
  39 static int verify_commit(const char *name, unsigned flags)
  40 {
  41         enum object_type type;
  42         struct object_id oid;
  43         char *buf;
  44         unsigned long size;
  45         int ret;
  46
  47         if (get_oid(name, &oid))
  48                 return error("commit '%s' not found.", name);
  49
  50         buf = read_object_file(&oid, &type, &size);
  51         if (!buf)
  52                 return error("%s: unable to read file.", name);
  53         if (type != OBJ_COMMIT)
  54                 return error("%s: cannot verify a non-commit object of type %s.",
  55                                 name, type_name(type));
  56
  57         ret = run_gpg_verify(&oid, buf, size, flags);
  58
  59         free(buf);
  60         return ret;
  61 }
  62
  63 static int git_verify_commit_config(const char *var, const char *value, void *cb)
  64 {
  65         int status = git_gpg_config(var, value, cb);
  66         if (status)
  67                 return status;
  68         return git_default_config(var, value, cb);
  69 }
  70
  71 int cmd_verify_commit(int argc, const char **argv, const char *prefix)
  72 {
  73         int i = 1, verbose = 0, had_error = 0;
  74         unsigned flags = 0;
  75         const struct option verify_commit_options[] = {
  76                 OPT__VERBOSE(&verbose, N_("print commit contents")),
  77                 OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
  78                 OPT_END()
  79         };
  80
  81         git_config(git_verify_commit_config, NULL);
  82
  83         argc = parse_options(argc, argv, prefix, verify_commit_options,
  84                              verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
  85         if (argc <= i)
  86                 usage_with_options(verify_commit_usage, verify_commit_options);
  87
  88         if (verbose)
  89                 flags |= GPG_VERIFY_VERBOSE;
  90
  91         /* sometimes the program was terminated because this signal
  92          * was received in the process of writing the gpg input: */
  93         signal(SIGPIPE, SIG_IGN);
  94         while (i < argc)
  95                 if (verify_commit(argv[i++], flags))
  96                         had_error = 1;
  97         return had_error;
  98 }