builtin-mailinfo.c: check error status from rewind and ftruncate
[git/spearce.git] / builtin-tar-tree.c
blob8b3a35e12da2cca8b632d4139bc2c5ba2409d322
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"
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.";
14 int cmd_tar_tree(int argc, const char **argv, const char *prefix)
17 * "git tar-tree" is now a wrapper around "git archive --format=tar"
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
26 int i;
27 const char **nargv = xcalloc(sizeof(*nargv), argc + 3);
28 char *basedir_arg;
29 int nargc = 0;
31 nargv[nargc++] = "archive";
32 nargv[nargc++] = "--format=tar";
34 if (2 <= argc && !prefixcmp(argv[1], "--remote=")) {
35 nargv[nargc++] = argv[1];
36 argv++;
37 argc--;
41 * Because it's just a compatibility wrapper, tar-tree supports only
42 * the old behaviour of reading attributes from the work tree.
44 nargv[nargc++] = "--worktree-attributes";
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];
60 nargv[nargc] = NULL;
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]);
69 fputc('\n', stderr);
70 return cmd_archive(nargc, nargv, prefix);
73 /* ustar header + extended global header content */
74 #define RECORDSIZE (512)
75 #define HEADERSIZE (2 * RECORDSIZE)
77 int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix)
79 char buffer[HEADERSIZE];
80 struct ustar_header *header = (struct ustar_header *)buffer;
81 char *content = buffer + RECORDSIZE;
82 ssize_t n;
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;
92 n = write_in_full(1, content + 11, 41);
93 if (n < 41)
94 die_errno("git get-tar-commit-id: write error");
96 return 0;