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unpack-trees: let read-tree -u remove index entries outside sparse area

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To avoid touching the worktree outside a sparse checkout,
when the update flag is enabled unpack_trees() clears the
CE_UPDATE and CE_REMOVE flags on entries that do not match the
sparse pattern before actually committing any updates to the
index file or worktree.

The effect on the index was unintentional; sparse checkout was
never meant to prevent index updates outside the area checked
out.  And the result is very confusing: for example, after a
failed merge, currently "git reset --hard" does not reset the
state completely but an additional "git reset --mixed" will.

So stop clearing the CE_REMOVE flag.  Instead, maintain a
CE_WT_REMOVE flag to separately track whether a particular
file removal should apply to the worktree in addition to the
index or not.

The CE_WT_REMOVE flag is used already to mark files that
should be removed because of a narrowing checkout area.  That
usage will still apply; do not clear the CE_WT_REMOVE flag
in that case (detectable because the CE_REMOVE flag is not
set).

This bug masked some other bugs illustrated by the test
suite, which will be addressed by later patches.

Reported-by: Frédéric Brière <fbriere@fbriere.net>
Fixes: http://bugs.debian.org/583699

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2010-07-31 13:14:27 +07:00 committed by Junio C Hamano
parent eec3fc0309
commit 700e66d661
3 changed files with 30 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
cache.h
View file

@ -179,8 +179,7 @@ struct cache_entry {
#define CE_UNHASHED (0x200000)
#define CE_CONFLICTED (0x800000)
/* Only remove in work directory, not index */
#define CE_WT_REMOVE (0x400000)
#define CE_WT_REMOVE (0x400000) /* remove in work directory */
#define CE_UNPACKED (0x1000000)

11
t/t1011-read-tree-sparse-checkout.sh
View file

@ -146,7 +146,7 @@ test_expect_success 'read-tree adds to worktree, absent case' '
test ! -f sub/added
'
test_expect_success 'read-tree adds to worktree, dirty case' '
test_expect_failure 'read-tree adds to worktree, dirty case' '
echo init.t >.git/info/sparse-checkout &&
git checkout -f removed &&
mkdir sub &&
@ -167,4 +167,13 @@ test_expect_success 'index removal and worktree narrowing at the same time' '
test_cmp empty result
'
test_expect_success 'read-tree --reset removes outside worktree' '
>empty &&
echo init.t >.git/info/sparse-checkout &&
git checkout -f top &&
git reset --hard removed &&
git ls-files sub/added >result &&
test_cmp empty result
'
test_done

29
unpack-trees.c
View file

@ -53,6 +53,9 @@ static void add_entry(struct unpack_trees_options *o, struct cache_entry *ce,
clear |= CE_HASHED | CE_UNHASHED;
if (set & CE_REMOVE)
set |= CE_WT_REMOVE;
memcpy(new, ce, size);
new->next = NULL;
new->ce_flags = (new->ce_flags & ~clear) | set;
@ -92,7 +95,7 @@ static int check_updates(struct unpack_trees_options *o)
if (o->update && o->verbose_update) {
for (total = cnt = 0; cnt < index->cache_nr; cnt++) {
struct cache_entry *ce = index->cache[cnt];
if (ce->ce_flags & (CE_UPDATE | CE_REMOVE | CE_WT_REMOVE))
if (ce->ce_flags & (CE_UPDATE | CE_WT_REMOVE))
total++;
}
@ -112,12 +115,6 @@ static int check_updates(struct unpack_trees_options *o)
unlink_entry(ce);
continue;
}
if (ce->ce_flags & CE_REMOVE) {
display_progress(progress, ++cnt);
if (o->update)
unlink_entry(ce);
}
}
remove_marked_cache_entries(&o->result);
remove_scheduled_dirs();
@ -172,10 +169,22 @@ static int apply_sparse_checkout(struct cache_entry *ce, struct unpack_trees_opt
/*
* Merge strategies may set CE_UPDATE|CE_REMOVE outside checkout
* area as a result of ce_skip_worktree() shortcuts in
* verify_absent() and verify_uptodate(). Clear them.
* verify_absent() and verify_uptodate().
* Make sure they don't modify worktree if they are already
* outside checkout area
*/
if (was_skip_worktree && ce_skip_worktree(ce))
ce->ce_flags &= ~(CE_UPDATE | CE_REMOVE);
if (was_skip_worktree && ce_skip_worktree(ce)) {
ce->ce_flags &= ~CE_UPDATE;
/*
* By default, when CE_REMOVE is on, CE_WT_REMOVE is also
* on to get that file removed from both index and worktree.
* If that file is already outside worktree area, don't
* bother remove it.
*/
if (ce->ce_flags & CE_REMOVE)
ce->ce_flags &= ~CE_WT_REMOVE;
}
if (!was_skip_worktree && ce_skip_worktree(ce)) {
/*