builtin-tar-tree.c

   1 /*
   2  * Copyright (c) 2005, 2006 Rene Scharfe
   3  */
   4 #include "cache.h"
   5 #include "commit.h"
   6 #include "tar.h"
   7 #include "builtin.h"
   8 #include "quote.h"
   9
  10 static const char tar_tree_usage[] =
  11 "git tar-tree [--remote=<repo>] <tree-ish> [basedir]\n"
  12 "*** Note that this command is now deprecated; use \"git archive\" instead.";
  13
  14 static const char builtin_get_tar_commit_id_usage[] =
  15 "git get-tar-commit-id < <tarfile>";
  16
  17 int cmd_tar_tree(int argc, const char **argv, const char *prefix)
  18 {
  19         /*
  20          * "git tar-tree" is now a wrapper around "git archive --format=tar"
  21          *
  22          * $0 --remote=<repo> arg... ==>
  23          *      git archive --format=tar --remote=<repo> arg...
  24          * $0 tree-ish ==>
  25          *      git archive --format=tar tree-ish
  26          * $0 tree-ish basedir ==>
  27          *      git archive --format-tar --prefix=basedir tree-ish
  28          */
  29         int i;
  30         const char **nargv = xcalloc(sizeof(*nargv), argc + 3);
  31         char *basedir_arg;
  32         int nargc = 0;
  33
  34         nargv[nargc++] = "archive";
  35         nargv[nargc++] = "--format=tar";
  36
  37         if (2 <= argc && !prefixcmp(argv[1], "--remote=")) {
  38                 nargv[nargc++] = argv[1];
  39                 argv++;
  40                 argc--;
  41         }
  42
  43         /*
  44          * Because it's just a compatibility wrapper, tar-tree supports only
  45          * the old behaviour of reading attributes from the work tree.
  46          */
  47         nargv[nargc++] = "--worktree-attributes";
  48
  49         switch (argc) {
  50         default:
  51                 usage(tar_tree_usage);
  52                 break;
  53         case 3:
  54                 /* base-path */
  55                 basedir_arg = xmalloc(strlen(argv[2]) + 11);
  56                 sprintf(basedir_arg, "--prefix=%s/", argv[2]);
  57                 nargv[nargc++] = basedir_arg;
  58                 /* fallthru */
  59         case 2:
  60                 /* tree-ish */
  61                 nargv[nargc++] = argv[1];
  62         }
  63         nargv[nargc] = NULL;
  64
  65         fprintf(stderr,
  66                 "*** \"git tar-tree\" is now deprecated.\n"
  67                 "*** Running \"git archive\" instead.\n***");
  68         for (i = 0; i < nargc; i++) {
  69                 fputc(' ', stderr);
  70                 sq_quote_print(stderr, nargv[i]);
  71         }
  72         fputc('\n', stderr);
  73         return cmd_archive(nargc, nargv, prefix);
  74 }
  75
  76 /* ustar header + extended global header content */
  77 #define RECORDSIZE      (512)
  78 #define HEADERSIZE (2 * RECORDSIZE)
  79
  80 int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix)
  81 {
  82         char buffer[HEADERSIZE];
  83         struct ustar_header *header = (struct ustar_header *)buffer;
  84         char *content = buffer + RECORDSIZE;
  85         ssize_t n;
  86
  87         if (argc != 1)
  88                 usage(builtin_get_tar_commit_id_usage);
  89
  90         n = read_in_full(0, buffer, HEADERSIZE);
  91         if (n < HEADERSIZE)
  92                 die("git get-tar-commit-id: read error");
  93         if (header->typeflag[0] != 'g')
  94                 return 1;
  95         if (memcmp(content, "52 comment=", 11))
  96                 return 1;
  97
  98         n = write_in_full(1, content + 11, 41);
  99         if (n < 41)
 100                 die_errno("git get-tar-commit-id: write error");
 101
 102         return 0;
 103 }