Andrew's git - gitweb.git/blob - 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 "commit.h"
  12#include "run-command.h"
  13#include <signal.h>
  14#include "parse-options.h"
  15#include "gpg-interface.h"
  16
  17static const char * const verify_commit_usage[] = {
  18                N_("git verify-commit [-v | --verbose] <commit>..."),
  19                NULL
  20};
  21
  22static int run_gpg_verify(const struct object_id *oid, const char *buf, unsigned long size, unsigned flags)
  23{
  24        struct signature_check signature_check;
  25        int ret;
  26
  27        memset(&signature_check, 0, sizeof(signature_check));
  28
  29        ret = check_commit_signature(lookup_commit(oid), &signature_check);
  30        print_signature_buffer(&signature_check, flags);
  31
  32        signature_check_clear(&signature_check);
  33        return ret;
  34}
  35
  36static int verify_commit(const char *name, unsigned flags)
  37{
  38        enum object_type type;
  39        struct object_id oid;
  40        char *buf;
  41        unsigned long size;
  42        int ret;
  43
  44        if (get_oid(name, &oid))
  45                return error("commit '%s' not found.", name);
  46
  47        buf = read_sha1_file(oid.hash, &type, &size);
  48        if (!buf)
  49                return error("%s: unable to read file.", name);
  50        if (type != OBJ_COMMIT)
  51                return error("%s: cannot verify a non-commit object of type %s.",
  52                                name, type_name(type));
  53
  54        ret = run_gpg_verify(&oid, buf, size, flags);
  55
  56        free(buf);
  57        return ret;
  58}
  59
  60static int git_verify_commit_config(const char *var, const char *value, void *cb)
  61{
  62        int status = git_gpg_config(var, value, cb);
  63        if (status)
  64                return status;
  65        return git_default_config(var, value, cb);
  66}
  67
  68int cmd_verify_commit(int argc, const char **argv, const char *prefix)
  69{
  70        int i = 1, verbose = 0, had_error = 0;
  71        unsigned flags = 0;
  72        const struct option verify_commit_options[] = {
  73                OPT__VERBOSE(&verbose, N_("print commit contents")),
  74                OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
  75                OPT_END()
  76        };
  77
  78        git_config(git_verify_commit_config, NULL);
  79
  80        argc = parse_options(argc, argv, prefix, verify_commit_options,
  81                             verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
  82        if (argc <= i)
  83                usage_with_options(verify_commit_usage, verify_commit_options);
  84
  85        if (verbose)
  86                flags |= GPG_VERIFY_VERBOSE;
  87
  88        /* sometimes the program was terminated because this signal
  89         * was received in the process of writing the gpg input: */
  90        signal(SIGPIPE, SIG_IGN);
  91        while (i < argc)
  92                if (verify_commit(argv[i++], flags))
  93                        had_error = 1;
  94        return had_error;
  95}