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diff*: fix worktree setup

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This fixes "git diff", "git diff-files" and "git diff-index" to work
correctly under worktree setup. Because diff* family works in many modes
and not all of them require worktree, Junio made a nice summary
(with a little modification from me):

 * diff-files is about comparing with work tree, so it obviously needs a
  work tree;

 * diff-index also does, except "diff-index --cached" or "diff --cached TREE"

 * no-index is about random files outside git context, so it obviously
   doesn't need any work tree;

 * comparing two (or more) trees doesn't;

 * comparing two blobs doesn't;

 * comparing a blob with a random file doesn't;

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy
2008-08-28 20:02:12 +07:00
committed by Junio C Hamano
parent c67b1fa349
commit 4f38f6b5ba
4 changed files with 63 additions and 3 deletions
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3
builtin-diff.c
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@ -122,6 +122,8 @@ static int builtin_diff_index(struct rev_info *revs,
usage(builtin_diff_usage);
argv++; argc--;
}
if (!cached)
setup_work_tree();
/*
* Make sure there is one revision (i.e. pending object),
* and there is no revision filtering parameters.
@ -225,6 +227,7 @@ static int builtin_diff_files(struct rev_info *revs, int argc, const char **argv
(revs->diffopt.output_format & DIFF_FORMAT_PATCH))
revs->combine_merges = revs->dense_combined_merges = 1;
setup_work_tree();
if (read_cache() < 0) {
perror("read_cache");
return -1;