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
  16 static const char * const verify_tag_usage[] = {
  17                 N_("git verify-tag [-v | --verbose] <tag>..."),
  18                 NULL
  19 };
  20
  21 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
  22 {
  23         struct signature_check sigc;
  24         size_t payload_size;
  25         int ret;
  26
  27         memset(&sigc, 0, sizeof(sigc));
  28
  29         payload_size = parse_signature(buf, size);
  30
  31         if (size == payload_size) {
  32                 if (flags & GPG_VERIFY_VERBOSE)
  33                         write_in_full(1, buf, payload_size);
  34                 return error("no signature found");
  35         }
  36
  37         ret = check_signature(buf, payload_size, buf + payload_size,
  38                                 size - payload_size, &sigc);
  39         print_signature_buffer(&sigc, flags);
  40
  41         signature_check_clear(&sigc);
  42         return ret;
  43 }
  44
  45 static int verify_tag(const unsigned char *sha1, const char *name_to_report,
  46                         unsigned flags)
  47 {
  48         enum object_type type;
  49         char *buf;
  50         unsigned long size;
  51         int ret;
  52
  53         type = sha1_object_info(sha1, NULL);
  54         if (type != OBJ_TAG)
  55                 return error("%s: cannot verify a non-tag object of type %s.",
  56                                 name_to_report ?
  57                                 name_to_report :
  58                                 find_unique_abbrev(sha1, DEFAULT_ABBREV),
  59                                 typename(type));
  60
  61         buf = read_sha1_file(sha1, &type, &size);
  62         if (!buf)
  63                 return error("%s: unable to read file.",
  64                                 name_to_report ?
  65                                 name_to_report :
  66                                 find_unique_abbrev(sha1, DEFAULT_ABBREV));
  67
  68         ret = run_gpg_verify(buf, size, flags);
  69
  70         free(buf);
  71         return ret;
  72 }
  73
  74 static int git_verify_tag_config(const char *var, const char *value, void *cb)
  75 {
  76         int status = git_gpg_config(var, value, cb);
  77         if (status)
  78                 return status;
  79         return git_default_config(var, value, cb);
  80 }
  81
  82 int cmd_verify_tag(int argc, const char **argv, const char *prefix)
  83 {
  84         int i = 1, verbose = 0, had_error = 0;
  85         unsigned flags = 0;
  86         const struct option verify_tag_options[] = {
  87                 OPT__VERBOSE(&verbose, N_("print tag contents")),
  88                 OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
  89                 OPT_END()
  90         };
  91
  92         git_config(git_verify_tag_config, NULL);
  93
  94         argc = parse_options(argc, argv, prefix, verify_tag_options,
  95                              verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
  96         if (argc <= i)
  97                 usage_with_options(verify_tag_usage, verify_tag_options);
  98
  99         if (verbose)
 100                 flags |= GPG_VERIFY_VERBOSE;
 101
 102         while (i < argc) {
 103                 unsigned char sha1[20];
 104                 const char *name = argv[i++];
 105                 if (get_sha1(name, sha1))
 106                         had_error = !!error("tag '%s' not found.", name);
 107                 else if (verify_tag(sha1, name, flags))
 108                         had_error = 1;
 109         }
 110         return had_error;
 111 }