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, 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
  44 static 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
  70 static 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
  78 int 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 }