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         if (verbose)
  31                 write_in_full(1, buf, len);
  32
  33         if (size == len)
  34                 return error("no signature found");
  35
  36         ret = check_signature(buf, len, buf + len, size - len, &sigc);
  37         fputs(sigc.gpg_output, stderr);
  38
  39         signature_check_clear(&sigc);
  40         return ret;
  41 }
  42
  43 static int verify_tag(const char *name, int verbose)
  44 {
  45         enum object_type type;
  46         unsigned char sha1[20];
  47         char *buf;
  48         unsigned long size;
  49         int ret;
  50
  51         if (get_sha1(name, sha1))
  52                 return error("tag '%s' not found.", name);
  53
  54         type = sha1_object_info(sha1, NULL);
  55         if (type != OBJ_TAG)
  56                 return error("%s: cannot verify a non-tag object of type %s.",
  57                                 name, typename(type));
  58
  59         buf = read_sha1_file(sha1, &type, &size);
  60         if (!buf)
  61                 return error("%s: unable to read file.", name);
  62
  63         ret = run_gpg_verify(buf, size, verbose);
  64
  65         free(buf);
  66         return ret;
  67 }
  68
  69 static int git_verify_tag_config(const char *var, const char *value, void *cb)
  70 {
  71         int status = git_gpg_config(var, value, cb);
  72         if (status)
  73                 return status;
  74         return git_default_config(var, value, cb);
  75 }
  76
  77 int cmd_verify_tag(int argc, const char **argv, const char *prefix)
  78 {
  79         int i = 1, verbose = 0, had_error = 0;
  80         const struct option verify_tag_options[] = {
  81                 OPT__VERBOSE(&verbose, N_("print tag contents")),
  82                 OPT_END()
  83         };
  84
  85         git_config(git_verify_tag_config, NULL);
  86
  87         argc = parse_options(argc, argv, prefix, verify_tag_options,
  88                              verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
  89         if (argc <= i)
  90                 usage_with_options(verify_tag_usage, verify_tag_options);
  91
  92         /* sometimes the program was terminated because this signal
  93          * was received in the process of writing the gpg input: */
  94         signal(SIGPIPE, SIG_IGN);
  95         while (i < argc)
  96                 if (verify_tag(argv[i++], verbose))
  97                         had_error = 1;
  98         return had_error;
  99 }