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merge-recursive: Fix D/F conflicts

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The D/F conflicts that can be automatically resolved (file or directory
unmodified on one side of history), have the nice property that
process_entry() can correctly handle all subpaths of the D/F conflict.  In
the case of D->F conversions, it will correctly delete all non-conflicting
files below the relevant directory and the directory itself (note that both
untracked and conflicting files below the directory will prevent its
removal).  So if we handle D/F conflicts after all other conflicts, they
become fairly simple to handle -- we just need to check for whether or not
a path (file/directory) is in the way of creating the new content.  We do
this by having process_entry() defer handling such entries to a subsequent
process_df_entry() step.

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 07:10:53 -06:00 committed by Junio C Hamano
parent f433f70547
commit 37348937ff
2 changed files with 80 additions and 19 deletions
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93
merge-recursive.c
View File

@ -1072,6 +1072,7 @@ static int process_entry(struct merge_options *o,
unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
entry->processed = 1;
if (o_sha && (!a_sha || !b_sha)) {
/* Case A: Deleted in one */
if ((!a_sha && !b_sha) ||
@ -1104,33 +1105,28 @@ static int process_entry(struct merge_options *o,
} else if ((!o_sha && a_sha && !b_sha) ||
(!o_sha && !a_sha && b_sha)) {
/* Case B: Added in one. */
const char *add_branch;
const char *other_branch;
unsigned mode;
const unsigned char *sha;
const char *conf;
if (a_sha) {
add_branch = o->branch1;
other_branch = o->branch2;
mode = a_mode;
sha = a_sha;
conf = "file/directory";
} else {
add_branch = o->branch2;
other_branch = o->branch1;
mode = b_mode;
sha = b_sha;
conf = "directory/file";
}
if (string_list_has_string(&o->current_directory_set, path)) {
const char *new_path = unique_path(o, path, add_branch);
clean_merge = 0;
output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
"Adding %s as %s",
conf, path, other_branch, path, new_path);
remove_file(o, 0, path, 0);
update_file(o, 0, sha, mode, new_path);
/* Handle D->F conflicts after all subfiles */
entry->processed = 0;
/* But get any file out of the way now, so conflicted
* entries below the directory of the same name can
* be put in the working directory.
*/
if (a_sha)
output(o, 2, "Removing %s", path);
/* do not touch working file if it did not exist */
remove_file(o, 0, path, !a_sha);
return 1; /* Assume clean till processed */
} else {
output(o, 2, "Adding %s", path);
update_file(o, 1, sha, mode, path);
@ -1178,6 +1174,64 @@ static int process_entry(struct merge_options *o,
return clean_merge;
}
/*
* Per entry merge function for D/F conflicts, to be called only after
* all files below dir have been processed. We do this because in the
* cases we can cleanly resolve D/F conflicts, process_entry() can clean
* out all the files below the directory for us.
*/
static int process_df_entry(struct merge_options *o,
const char *path, struct stage_data *entry)
{
int clean_merge = 1;
unsigned o_mode = entry->stages[1].mode;
unsigned a_mode = entry->stages[2].mode;
unsigned b_mode = entry->stages[3].mode;
unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
const char *add_branch;
const char *other_branch;
unsigned mode;
const unsigned char *sha;
const char *conf;
struct stat st;
/* We currently only handle D->F cases */
assert((!o_sha && a_sha && !b_sha) ||
(!o_sha && !a_sha && b_sha));
entry->processed = 1;
if (a_sha) {
add_branch = o->branch1;
other_branch = o->branch2;
mode = a_mode;
sha = a_sha;
conf = "file/directory";
} else {
add_branch = o->branch2;
other_branch = o->branch1;
mode = b_mode;
sha = b_sha;
conf = "directory/file";
}
if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
const char *new_path = unique_path(o, path, add_branch);
clean_merge = 0;
output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
"Adding %s as %s",
conf, path, other_branch, path, new_path);
remove_file(o, 0, path, 0);
update_file(o, 0, sha, mode, new_path);
} else {
output(o, 2, "Adding %s", path);
update_file(o, 1, sha, mode, path);
}
return clean_merge;
}
struct unpack_trees_error_msgs get_porcelain_error_msgs(void)
{
struct unpack_trees_error_msgs msgs = {
@ -1249,6 +1303,13 @@ int merge_trees(struct merge_options *o,
&& !process_entry(o, path, e))
clean = 0;
}
for (i = 0; i < entries->nr; i++) {
const char *path = entries->items[i].string;
struct stage_data *e = entries->items[i].util;
if (!e->processed
&& !process_df_entry(o, path, e))
clean = 0;
}
string_list_clear(re_merge, 0);
string_list_clear(re_head, 0);

6
t/t6035-merge-dir-to-symlink.sh
View File

@ -56,7 +56,7 @@ test_expect_success 'Handle D/F conflict, do not lose a/b-2/c/d in merge (resolv
test -f a/b-2/c/d
'
test_expect_failure 'Handle D/F conflict, do not lose a/b-2/c/d in merge (recursive)' '
test_expect_success 'Handle D/F conflict, do not lose a/b-2/c/d in merge (recursive)' '
git reset --hard &&
git checkout baseline^0 &&
git merge -s recursive master &&
@ -130,7 +130,7 @@ test_expect_success 'merge should not have D/F conflicts (resolve)' '
test -f a/b/c/d
'
test_expect_failure 'merge should not have D/F conflicts (recursive)' '
test_expect_success 'merge should not have D/F conflicts (recursive)' '
git reset --hard &&
git checkout baseline^0 &&
git merge -s recursive test2 &&
@ -138,7 +138,7 @@ test_expect_failure 'merge should not have D/F conflicts (recursive)' '
test -f a/b/c/d
'
test_expect_failure 'merge should not have F/D conflicts (recursive)' '
test_expect_success 'merge should not have F/D conflicts (recursive)' '
git reset --hard &&
git checkout -b foo test2 &&
git merge -s recursive baseline^0 &&