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, 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
  39static 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
  63static 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
  71int 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}