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