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fast-export: Fix output order of D/F changes

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The fast-import stream format requires incremental changes which take place
immediately, meaning that for D->F conversions all files below the relevant
directory must be deleted before the resulting file of the same name is
created.  Reversing the order can result in fast-import silently deleting
the file right after creating it, resulting in the file missing from the
resulting repository.

We correct this by first sorting the diff_queue_struct in depth-first
order.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren 2010-07-09 07:10:55 -06:00 committed by Junio C Hamano
parent 5a2580d62f
commit 060df62422
2 changed files with 30 additions and 1 deletions
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29
builtin/fast-export.c
View file

@ -147,10 +147,39 @@ static void handle_object(const unsigned char *sha1)
free(buf);
}
static int depth_first(const void *a_, const void *b_)
{
const struct diff_filepair *a = *((const struct diff_filepair **)a_);
const struct diff_filepair *b = *((const struct diff_filepair **)b_);
const char *name_a, *name_b;
int len_a, len_b, len;
int cmp;
name_a = a->one ? a->one->path : a->two->path;
name_b = b->one ? b->one->path : b->two->path;
len_a = strlen(name_a);
len_b = strlen(name_b);
len = (len_a < len_b) ? len_a : len_b;
/* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
cmp = memcmp(name_a, name_b, len);
if (cmp)
return cmp;
return (len_b - len_a);
}
static void show_filemodify(struct diff_queue_struct *q,
struct diff_options *options, void *data)
{
int i;
/*
* Handle files below a directory first, in case they are all deleted
* and the directory changes to a file or symlink.
*/
qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
for (i = 0; i < q->nr; i++) {
struct diff_filespec *ospec = q->queue[i]->one;
struct diff_filespec *spec = q->queue[i]->two;

2
t/t9350-fast-export.sh
View file

@ -376,7 +376,7 @@ test_expect_success 'tree_tag-obj' 'git fast-export tree_tag-obj'
test_expect_success 'tag-obj_tag' 'git fast-export tag-obj_tag'
test_expect_success 'tag-obj_tag-obj' 'git fast-export tag-obj_tag-obj'
test_expect_failure 'directory becomes symlink' '
test_expect_success 'directory becomes symlink' '
git init dirtosymlink &&
git init result &&
(