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, int verbose)
  22 {
  23         struct signature_check signature_check;
  24
  25         memset(&signature_check, 0, sizeof(signature_check));
  26
  27         check_commit_signature(lookup_commit(sha1), &signature_check);
  28
  29         if (verbose && signature_check.payload)
  30                 fputs(signature_check.payload, stdout);
  31
  32         if (signature_check.gpg_output)
  33                 fputs(signature_check.gpg_output, stderr);
  34
  35         signature_check_clear(&signature_check);
  36         return signature_check.result != 'G';
  37 }
  38
  39 static int verify_commit(const char *name, int verbose)
  40 {
  41         enum object_type type;
  42         unsigned char sha1[20];
  43         char *buf;
  44         unsigned long size;
  45         int ret;
  46
  47         if (get_sha1(name, sha1))
  48                 return error("commit '%s' not found.", name);
  49
  50         buf = read_sha1_file(sha1, &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, typename(type));
  56
  57         ret = run_gpg_verify(sha1, buf, size, verbose);
  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         const struct option verify_commit_options[] = {
  75                 OPT__VERBOSE(&verbose, N_("print commit contents")),
  76                 OPT_END()
  77         };
  78
  79         git_config(git_verify_commit_config, NULL);
  80
  81         argc = parse_options(argc, argv, prefix, verify_commit_options,
  82                              verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
  83         if (argc <= i)
  84                 usage_with_options(verify_commit_usage, verify_commit_options);
  85
  86         /* sometimes the program was terminated because this signal
  87          * was received in the process of writing the gpg input: */
  88         signal(SIGPIPE, SIG_IGN);
  89         while (i < argc)
  90                 if (verify_commit(argv[i++], verbose))
  91                         had_error = 1;
  92         return had_error;
  93 }