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
  26         memset(&sigc, 0, sizeof(sigc));
  27
  28         len = parse_signature(buf, size);
  29         if (verbose)
  30                 write_in_full(1, buf, len);
  31
  32         if (size == len)
  33                 return error("no signature found");
  34
  35         check_signature(buf, len, buf + len, size - len, &sigc);
  36         fputs(sigc.gpg_output, stderr);
  37
  38         signature_check_clear(&sigc);
  39         return sigc.result != 'G' && sigc.result != 'U';
  40 }
  41
  42 static int verify_tag(const char *name, int verbose)
  43 {
  44         enum object_type type;
  45         unsigned char sha1[20];
  46         char *buf;
  47         unsigned long size;
  48         int ret;
  49
  50         if (get_sha1(name, sha1))
  51                 return error("tag '%s' not found.", name);
  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, typename(type));
  57
  58         buf = read_sha1_file(sha1, &type, &size);
  59         if (!buf)
  60                 return error("%s: unable to read file.", name);
  61
  62         ret = run_gpg_verify(buf, size, verbose);
  63
  64         free(buf);
  65         return ret;
  66 }
  67
  68 static int git_verify_tag_config(const char *var, const char *value, void *cb)
  69 {
  70         int status = git_gpg_config(var, value, cb);
  71         if (status)
  72                 return status;
  73         return git_default_config(var, value, cb);
  74 }
  75
  76 int cmd_verify_tag(int argc, const char **argv, const char *prefix)
  77 {
  78         int i = 1, verbose = 0, had_error = 0;
  79         const struct option verify_tag_options[] = {
  80                 OPT__VERBOSE(&verbose, N_("print tag contents")),
  81                 OPT_END()
  82         };
  83
  84         git_config(git_verify_tag_config, NULL);
  85
  86         argc = parse_options(argc, argv, prefix, verify_tag_options,
  87                              verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
  88         if (argc <= i)
  89                 usage_with_options(verify_tag_usage, verify_tag_options);
  90
  91         /* sometimes the program was terminated because this signal
  92          * was received in the process of writing the gpg input: */
  93         signal(SIGPIPE, SIG_IGN);
  94         while (i < argc)
  95                 if (verify_tag(argv[i++], verbose))
  96                         had_error = 1;
  97         return had_error;
  98 }