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 "builtin.h"
  10 #include "commit.h"
  11 #include "run-command.h"
  12 #include <signal.h>
  13 #include "parse-options.h"
  14 #include "gpg-interface.h"
  15
  16 static const char * const verify_commit_usage[] = {
  17                 N_("git verify-commit [-v | --verbose] <commit>..."),
  18                 NULL
  19 };
  20
  21 static int run_gpg_verify(const unsigned char *sha1, const char *buf, unsigned long size, unsigned flags)
  22 {
  23         struct signature_check signature_check;
  24         int ret;
  25
  26         memset(&signature_check, 0, sizeof(signature_check));
  27
  28         ret = check_commit_signature(lookup_commit(sha1), &signature_check);
  29         print_signature_buffer(&signature_check, flags);
  30
  31         signature_check_clear(&signature_check);
  32         return ret;
  33 }
  34
  35 static int verify_commit(const char *name, unsigned flags)
  36 {
  37         enum object_type type;
  38         unsigned char sha1[20];
  39         char *buf;
  40         unsigned long size;
  41         int ret;
  42
  43         if (get_sha1(name, sha1))
  44                 return error("commit '%s' not found.", name);
  45
  46         buf = read_sha1_file(sha1, &type, &size);
  47         if (!buf)
  48                 return error("%s: unable to read file.", name);
  49         if (type != OBJ_COMMIT)
  50                 return error("%s: cannot verify a non-commit object of type %s.",
  51                                 name, typename(type));
  52
  53         ret = run_gpg_verify(sha1, buf, size, flags);
  54
  55         free(buf);
  56         return ret;
  57 }
  58
  59 static int git_verify_commit_config(const char *var, const char *value, void *cb)
  60 {
  61         int status = git_gpg_config(var, value, cb);
  62         if (status)
  63                 return status;
  64         return git_default_config(var, value, cb);
  65 }
  66
  67 int cmd_verify_commit(int argc, const char **argv, const char *prefix)
  68 {
  69         int i = 1, verbose = 0, had_error = 0;
  70         unsigned flags = 0;
  71         const struct option verify_commit_options[] = {
  72                 OPT__VERBOSE(&verbose, N_("print commit contents")),
  73                 OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
  74                 OPT_END()
  75         };
  76
  77         git_config(git_verify_commit_config, NULL);
  78
  79         argc = parse_options(argc, argv, prefix, verify_commit_options,
  80                              verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
  81         if (argc <= i)
  82                 usage_with_options(verify_commit_usage, verify_commit_options);
  83
  84         if (verbose)
  85                 flags |= GPG_VERIFY_VERBOSE;
  86
  87         /* sometimes the program was terminated because this signal
  88          * was received in the process of writing the gpg input: */
  89         signal(SIGPIPE, SIG_IGN);
  90         while (i < argc)
  91                 if (verify_commit(argv[i++], flags))
  92                         had_error = 1;
  93         return had_error;
  94 }