When we merge into an unborn branch, there are basically two
steps:
1. Write the sha1 of the new commit into the ref pointed
to by HEAD.
2. Update the index with the new content, and check it out
to the working tree.
We currently do them in this order. However, (2) is the step
that is much more likely to fail, since it can be blocked by
things like untracked working tree files. When it does, the
merge fails and we are left with an empty index but an
updated HEAD.
This patch switches the order, so that a failure in updating
the index leaves us unchanged. Of course, a failure in
updating the ref now leaves us with an updated index and
mis-matched HEAD. That is arguably not much better, but it
is probably less likely to actually happen.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This file ends up conflicting with the test just after it
(causing the "git merge" to fail). Neither test is to blame
for the bug, though. It looks like the merge in 1a9fe45
(Merge branch 'tr/merge-unborn-clobber', 2011-02-09) is what
caused the conflict.
We didn't notice because the follow-on test is already
marked as expect_failure (even though it has since been
fixed, and now succeeds once the untracked file is moved out
of the way).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This was fixed by 1d718a51 (do not overwrite untracked
symlinks, 2011-02-20).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* cb/leading-path-removal:
use persistent memory for rejected paths
do not overwrite files in leading path
lstat_cache: optionally return match_len
add function check_ok_to_remove()
t7607: add leading-path tests
t7607: use test-lib functions and check MERGE_HEAD
Conflicts:
t/t7607-merge-overwrite.sh
An aborted merge prints the list of rejected paths as part of the
error message. Since commit f66caaf9 (do not overwrite files in
leading path), some of those paths do not have static buffers, so
we have to keep a copy. Use string_list's to accomplish this.
This changes the order of the list to the order in which the paths
are processed. Previously, it was reversed.
Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In case HEAD does not point to a valid commit yet, merge is
implemented as a hard reset. This will cause untracked files to be
overwritten.
Instead, assume the empty tree for HEAD and do a regular merge. An
untracked file will cause the merge to abort and do nothing. If no
conflicting files are present, the merge will have the same effect
as a hard reset.
Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
If the work tree contains an untracked file x, and
unpack-trees wants to checkout a path x/*, the
file x is removed unconditionally.
Instead, apply the same checks that are normally
used for untracked files, and abort if the file
cannot be removed.
Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Use the test_commit and test_path_is_missing
functions from the test library.
Also make sure that a merge which fails due to
pre-merge checks aborts properly and does not
leave MERGE_HEAD behind.
The "will not overwrite removed file" test is an
exception to this. It notices the untracked file
at a stage where the merge is already well under
way. Therefore we cannot abort the merge without
major restructuring. See the following thread for
more details.
http://mid.gmane.org/7vskopwxej.fsf@gitster.siamese.dyndns.org
Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Running git-merge on an unborn branch is supposed to do an index-level
merge with the other side, and then update the branch name there. In
the common case where the index was empty at the start, this makes
'git pull otherrepo branch' a convenient way to populate the history
after 'git init'.
However, if the index was *not* empty, git-merge silently discards
*both index and worktree* copies of all files that were tracked,
leading to data loss. Exhibit this bug.
Reported-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
test_must_fail will account for segfaults in git, so it should be used
instead of "! git"
This patch does not change any of the commands that use pipes.
Signed-off-by: Jared Hance <jaredhance@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When merge-recursive wanted to create a new file in the work tree (either
as the final result, or a hint for reference purposes while delete/modify
conflicts), it unconditionally overwrote an untracked file in the working
tree. Be careful not to lose whatever the user has that is not tracked.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
If a file was removed in HEAD, but modified in MERGE_HEAD, recursive merge
will result in a "CONFLICT (delete/modify)". If the (now untracked) file
already exists and was not added to the index, it is overwritten with the
conflict resolution contents.
In similar situations (cf. test 2), the merge would abort with
"error: Untracked working tree 'file' would be overwritten by merge."
The same should happen in this case.
Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
