=== Handling the working tree ===
The previous behavior for these conflict types in regards to the
working tree (assuming the file collision occurs at 'foo') was:
* add/add does a two-way merge of the two files and records it as 'foo'.
* rename/rename(2to1) records the two different files into two new
uniquely named files (foo~HEAD and foo~$MERGE), while removing 'foo'
from the working tree.
* rename/add records the two different files into two different
locations, recording the add at foo~$SIDE and, oddly, recording
the rename at foo (why is the rename more important than the add?)
So, the question for what to write to the working tree boils down to
whether the two colliding files should be two-way merged and recorded in
place, or recorded into separate files. As per discussion on the git
mailing lit, two-way merging was deemed to always be preferred, as that
makes these cases all more like content conflicts that users can handle
from within their favorite editor, IDE, or merge tool. Note that since
renames already involve a content merge, rename/add and
rename/rename(2to1) conflicts could result in nested conflict markers.
=== Handling of the index ===
For a typical rename, unpack_trees() would set up the index in the
following fashion:
old_path new_path
stage1: 5ca1ab1e 00000000
stage2: f005ba11 00000000
stage3: 00000000 b0a710ad
And merge-recursive would rewrite this to
new_path
stage1: 5ca1ab1e
stage2: f005ba11
stage3: b0a710ad
Removing old_path from the index means the user won't have to `git rm
old_path` manually every time a renamed path has a content conflict.
It also means they can use `git checkout [--ours|--theirs|--conflict|-m]
new_path`, `git diff [--ours|--theirs]` and various other commands that
would be difficult otherwise.
This strategy becomes a problem when we have a rename/add or
rename/rename(2to1) conflict, however, because then we have only three
slots to store blob sha1s and we need either four or six. Previously,
this was handled by continuing to delete old_path from the index, and
just outright ignoring any blob shas from old_path. That had the
downside of deleting any trace of changes made to old_path on the other
side of history. This function instead does a three-way content merge of
the renamed file, and stores the blob sha1 for that at either stage2 or
stage3 for new_path (depending on which side the rename came from). That
has the advantage of bringing information about changes on both sides and
still allows for easy resolution (no need to git rm old_path, etc.), but
does have the downside that if the content merge had conflict markers,
then what we store in the index is the sha1 of a blob with conflict
markers. While that is a downside, it seems less problematic than the
downsides of any obvious alternatives, and certainly makes more sense
than the previous handling. Further, it has a precedent in that when we
do recursive merges, we may accept a file with conflict markers as the
resolution for the merge of the merge-bases, which will then show up in
the index of the outer merge at stage 1 if a conflict exists at the outer
level.
Signed-off-by: Elijah Newren <newren@gmail.com>
---
merge-recursive.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 121 insertions(+)
@@ -1559,6 +1559,127 @@ static struct diff_filespec *filespec_from_entry(struct diff_filespec *target,
return target;
}
+#if 0 // #if-0-ing avoids unused function warning; will make live in next commit
+static int handle_file_collision(struct merge_options *o,
+ const char *collide_path,
+ const char *prev_path1,
+ const char *prev_path2,
+ const char *branch1, const char *branch2,
+ const struct object_id *a_oid,
+ unsigned int a_mode,
+ const struct object_id *b_oid,
+ unsigned int b_mode)
+{
+ struct merge_file_info mfi;
+ struct diff_filespec null, a, b;
+ char *alt_path = NULL;
+ const char *update_path = collide_path;
+
+ /*
+ * In the recursive case, we just opt to undo renames
+ */
+ if (o->call_depth && (prev_path1 || prev_path2)) {
+ /* Put first file (a_oid, a_mode) in its original spot */
+ if (prev_path1) {
+ if (update_file(o, 1, a_oid, a_mode, prev_path1))
+ return -1;
+ } else {
+ if (update_file(o, 1, a_oid, a_mode, collide_path))
+ return -1;
+ }
+
+ /* Put second file (b_oid, b_mode) in its original spot */
+ if (prev_path2) {
+ if (update_file(o, 1, b_oid, b_mode, prev_path2))
+ return -1;
+ } else {
+ if (update_file(o, 1, b_oid, b_mode, collide_path))
+ return -1;
+ }
+
+ /* Don't leave something at collision path if unrenaming both */
+ if (prev_path1 && prev_path2)
+ remove_file(o, 1, collide_path, 0);
+
+ return 0;
+ }
+
+ /* Remove rename sources if rename/add or rename/rename(2to1) */
+ if (prev_path1)
+ remove_file(o, 1, prev_path1,
+ o->call_depth || would_lose_untracked(prev_path1));
+ if (prev_path2)
+ remove_file(o, 1, prev_path2,
+ o->call_depth || would_lose_untracked(prev_path2));
+
+ /*
+ * Remove the collision path, if it wouldn't cause dirty contents
+ * or an untracked file to get lost. We'll either overwrite with
+ * merged contents, or just write out to differently named files.
+ */
+ if (was_dirty(o, collide_path)) {
+ output(o, 1, _("Refusing to lose dirty file at %s"),
+ collide_path);
+ update_path = alt_path = unique_path(o, collide_path, "merged");
+ } else if (would_lose_untracked(collide_path)) {
+ /*
+ * Only way we get here is if both renames were from
+ * a directory rename AND user had an untracked file
+ * at the location where both files end up after the
+ * two directory renames. See testcase 10d of t6043.
+ */
+ output(o, 1, _("Refusing to lose untracked file at "
+ "%s, even though it's in the way."),
+ collide_path);
+ update_path = alt_path = unique_path(o, collide_path, "merged");
+ } else {
+ /*
+ * FIXME: It's possible that the two files are identical
+ * and that the current working copy happens to match, in
+ * which case we are unnecessarily touching the working
+ * tree file. It's not a likely enough scenario that I
+ * want to code up the checks for it and a better fix is
+ * available if we restructure how unpack_trees() and
+ * merge-recursive interoperate anyway, so punting for
+ * now...
+ */
+ remove_file(o, 0, collide_path, 0);
+ }
+
+ /* Store things in diff_filespecs for functions that need it */
+ memset(&a, 0, sizeof(struct diff_filespec));
+ memset(&b, 0, sizeof(struct diff_filespec));
+ null.path = a.path = b.path = (char *)collide_path;
+ oidcpy(&null.oid, &null_oid);
+ null.mode = 0;
+ oidcpy(&a.oid, a_oid);
+ a.mode = a_mode;
+ a.oid_valid = 1;
+ oidcpy(&b.oid, b_oid);
+ b.mode = b_mode;
+ b.oid_valid = 1;
+
+ if (merge_mode_and_contents(o, &null, &a, &b, collide_path,
+ branch1, branch2, o->call_depth * 2, &mfi))
+ return -1;
+ mfi.clean &= !alt_path;
+ if (update_file(o, mfi.clean, &mfi.oid, mfi.mode, update_path))
+ return -1;
+ if (!mfi.clean && !o->call_depth &&
+ update_stages(o, collide_path, NULL, &a, &b))
+ return -1;
+ free(alt_path);
+ /*
+ * FIXME: If both a & b both started with conflicts (only possible
+ * if they came from a rename/rename(2to1)), but had IDENTICAL
+ * contents including those conflicts, then in the next line we claim
+ * it was clean. If someone cares about this case, we should have the
+ * caller notify us if we started with conflicts.
+ */
+ return mfi.clean;
+}
+#endif
+
static int handle_file(struct merge_options *o,
struct diff_filespec *rename,
int stage,