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