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 "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
  16static const char * const verify_commit_usage[] = {
  17                N_("git verify-commit [-v | --verbose] <commit>..."),
  18                NULL
  19};
  20
  21static 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
  35static 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
  59static 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
  67int 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}