Andrew's git - gitweb.git/blob - builtin/verify-tag.c

   1/*
   2 * Builtin "git verify-tag"
   3 *
   4 * Copyright (c) 2007 Carlos Rica <jasampler@gmail.com>
   5 *
   6 * Based on git-verify-tag.sh
   7 */
   8#include "cache.h"
   9#include "builtin.h"
  10#include "tag.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_tag_usage[] = {
  17                N_("git verify-tag [-v | --verbose] <tag>..."),
  18                NULL
  19};
  20
  21static int run_gpg_verify(const char *buf, unsigned long size, int verbose)
  22{
  23        struct signature_check sigc;
  24        int len;
  25        int ret;
  26
  27        memset(&sigc, 0, sizeof(sigc));
  28
  29        len = parse_signature(buf, size);
  30
  31        if (size == len) {
  32                if (verbose)
  33                        write_in_full(1, buf, len);
  34                return error("no signature found");
  35        }
  36
  37        ret = check_signature(buf, len, buf + len, size - len, &sigc);
  38        print_signature_buffer(&sigc, verbose ? GPG_VERIFY_VERBOSE : 0);
  39
  40        signature_check_clear(&sigc);
  41        return ret;
  42}
  43
  44static int verify_tag(const char *name, int verbose)
  45{
  46        enum object_type type;
  47        unsigned char sha1[20];
  48        char *buf;
  49        unsigned long size;
  50        int ret;
  51
  52        if (get_sha1(name, sha1))
  53                return error("tag '%s' not found.", name);
  54
  55        type = sha1_object_info(sha1, NULL);
  56        if (type != OBJ_TAG)
  57                return error("%s: cannot verify a non-tag object of type %s.",
  58                                name, typename(type));
  59
  60        buf = read_sha1_file(sha1, &type, &size);
  61        if (!buf)
  62                return error("%s: unable to read file.", name);
  63
  64        ret = run_gpg_verify(buf, size, verbose);
  65
  66        free(buf);
  67        return ret;
  68}
  69
  70static int git_verify_tag_config(const char *var, const char *value, void *cb)
  71{
  72        int status = git_gpg_config(var, value, cb);
  73        if (status)
  74                return status;
  75        return git_default_config(var, value, cb);
  76}
  77
  78int cmd_verify_tag(int argc, const char **argv, const char *prefix)
  79{
  80        int i = 1, verbose = 0, had_error = 0;
  81        const struct option verify_tag_options[] = {
  82                OPT__VERBOSE(&verbose, N_("print tag contents")),
  83                OPT_END()
  84        };
  85
  86        git_config(git_verify_tag_config, NULL);
  87
  88        argc = parse_options(argc, argv, prefix, verify_tag_options,
  89                             verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
  90        if (argc <= i)
  91                usage_with_options(verify_tag_usage, verify_tag_options);
  92
  93        /* sometimes the program was terminated because this signal
  94         * was received in the process of writing the gpg input: */
  95        signal(SIGPIPE, SIG_IGN);
  96        while (i < argc)
  97                if (verify_tag(argv[i++], verbose))
  98                        had_error = 1;
  99        return had_error;
 100}