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        int len;
  24
  25        len = parse_signature(buf, size);
  26        if (verbose)
  27                write_in_full(1, buf, len);
  28
  29        if (size == len)
  30                return error("no signature found");
  31
  32        return verify_signed_buffer(buf, len, buf + len, size - len, NULL, NULL);
  33}
  34
  35static int verify_tag(const char *name, int verbose)
  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("tag '%s' not found.", name);
  45
  46        type = sha1_object_info(sha1, NULL);
  47        if (type != OBJ_TAG)
  48                return error("%s: cannot verify a non-tag object of type %s.",
  49                                name, typename(type));
  50
  51        buf = read_sha1_file(sha1, &type, &size);
  52        if (!buf)
  53                return error("%s: unable to read file.", name);
  54
  55        ret = run_gpg_verify(buf, size, verbose);
  56
  57        free(buf);
  58        return ret;
  59}
  60
  61static int git_verify_tag_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
  69int cmd_verify_tag(int argc, const char **argv, const char *prefix)
  70{
  71        int i = 1, verbose = 0, had_error = 0;
  72        const struct option verify_tag_options[] = {
  73                OPT__VERBOSE(&verbose, N_("print tag contents")),
  74                OPT_END()
  75        };
  76
  77        git_config(git_verify_tag_config, NULL);
  78
  79        argc = parse_options(argc, argv, prefix, verify_tag_options,
  80                             verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
  81        if (argc <= i)
  82                usage_with_options(verify_tag_usage, verify_tag_options);
  83
  84        /* sometimes the program was terminated because this signal
  85         * was received in the process of writing the gpg input: */
  86        signal(SIGPIPE, SIG_IGN);
  87        while (i < argc)
  88                if (verify_tag(argv[i++], verbose))
  89                        had_error = 1;
  90        return had_error;
  91}