From: Elijah Newren <newren@xxxxxxxxx>
We allow renaming all entries in e.g. a directory named z/ into a
directory named y/ to be detected as a z/ -> y/ rename, so that if the
other side of history adds any files to the directory z/ in the mean
time, we can provide the hint that they should be moved to y/.
There is no reason to not allow 'y/' to be the root directory, but the
code did not handle that case correctly. Add a testcase and the
necessary special checks to support this case.
Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
merge-recursive.c | 52 ++++++++++++-
t/t6043-merge-rename-directories.sh | 114 ++++++++++++++++++++++++++++
2 files changed, 163 insertions(+), 3 deletions(-)
diff --git a/merge-recursive.c b/merge-recursive.c
index f80e48f623..ec60715368 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1931,6 +1931,16 @@ static char *apply_dir_rename(struct dir_rename_entry *entry,
return NULL;
oldlen = strlen(entry->dir);
+ if (entry->new_dir.len == 0)
+ /*
+ * If someone renamed/merged a subdirectory into the root
+ * directory (e.g. 'some/subdir' -> ''), then we want to
+ * avoid returning
+ * '' + '/filename'
+ * as the rename; we need to make old_path + oldlen advance
+ * past the '/' character.
+ */
+ oldlen++;
newlen = entry->new_dir.len + (strlen(old_path) - oldlen) + 1;
strbuf_grow(&new_path, newlen);
strbuf_addbuf(&new_path, &entry->new_dir);
@@ -1963,8 +1973,26 @@ static void get_renamed_dir_portion(const char *old_path, const char *new_path,
*/
end_of_old = strrchr(old_path, '/');
end_of_new = strrchr(new_path, '/');
- if (end_of_old == NULL || end_of_new == NULL)
- return; /* We haven't modified *old_dir or *new_dir yet. */
+
+ /*
+ * If end_of_old is NULL, old_path wasn't in a directory, so there
+ * could not be a directory rename (our rule elsewhere that a
+ * directory which still exists is not considered to have been
+ * renamed means the root directory can never be renamed -- because
+ * the root directory always exists).
+ */
+ if (end_of_old == NULL)
+ return; /* Note: *old_dir and *new_dir are still NULL */
+
+ /*
+ * If new_path contains no directory (end_of_new is NULL), then we
+ * have a rename of old_path's directory to the root directory.
+ */
+ if (end_of_new == NULL) {
+ *old_dir = xstrndup(old_path, end_of_old - old_path);
+ *new_dir = xstrdup("");
+ return;
+ }
/* Find the first non-matching character traversing backwards */
while (*--end_of_new == *--end_of_old &&
@@ -1978,7 +2006,25 @@ static void get_renamed_dir_portion(const char *old_path, const char *new_path,
*/
if (end_of_old == old_path && end_of_new == new_path &&
*end_of_old == *end_of_new)
- return; /* We haven't modified *old_dir or *new_dir yet. */
+ return; /* Note: *old_dir and *new_dir are still NULL */
+
+ /*
+ * If end_of_new got back to the beginning of its string, and
+ * end_of_old got back to the beginning of some subdirectory, then
+ * we have a rename/merge of a subdirectory into the root, which
+ * needs slightly special handling.
+ *
+ * Note: There is no need to consider the opposite case, with a
+ * rename/merge of the root directory into some subdirectory
+ * because as noted above the root directory always exists so it
+ * cannot be considered to be renamed.
+ */
+ if (end_of_new == new_path &&
+ end_of_old != old_path && end_of_old[-1] == '/') {
+ *old_dir = xstrndup(old_path, --end_of_old - old_path);
+ *new_dir = xstrdup("");
+ return;
+ }
/*
* We've found the first non-matching character in the directory
diff --git a/t/t6043-merge-rename-directories.sh b/t/t6043-merge-rename-directories.sh
index c966147d5d..32cdd1f493 100755
--- a/t/t6043-merge-rename-directories.sh
+++ b/t/t6043-merge-rename-directories.sh
@@ -4051,6 +4051,120 @@ test_expect_success '12c-check: Moving one directory hierarchy into another w/ c
)
'
+# Testcase 12d, Rename/merge of subdirectory into the root
+# Commit O: a/b/subdir/foo
+# Commit A: subdir/foo
+# Commit B: a/b/subdir/foo, a/b/bar
+# Expected: subdir/foo, bar
+
+test_expect_success '12d-setup: Rename/merge subdir into the root, variant 1' '
+ test_create_repo 12d &&
+ (
+ cd 12d &&
+
+ mkdir -p a/b/subdir &&
+ test_commit a/b/subdir/foo &&
+
+ git branch O &&
+ git branch A &&
+ git branch B &&
+
+ git checkout A &&
+ mkdir subdir &&
+ git mv a/b/subdir/foo.t subdir/foo.t &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git checkout B &&
+ test_commit a/b/bar
+ )
+'
+
+test_expect_success '12d-check: Rename/merge subdir into the root, variant 1' '
+ (
+ cd 12d &&
+
+ git checkout A^0 &&
+
+ git -c merge.directoryRenames=true merge -s recursive B^0 &&
+
+ git ls-files -s >out &&
+ test_line_count = 2 out &&
+
+ git rev-parse >actual \
+ HEAD:subdir/foo.t HEAD:bar.t &&
+ git rev-parse >expect \
+ O:a/b/subdir/foo.t B:a/b/bar.t &&
+ test_cmp expect actual &&
+
+ git hash-object bar.t >actual &&
+ git rev-parse B:a/b/bar.t >expect &&
+ test_cmp expect actual &&
+
+ test_must_fail git rev-parse HEAD:a/b/subdir/foo.t &&
+ test_must_fail git rev-parse HEAD:a/b/bar.t &&
+ test_path_is_missing a/ &&
+ test_path_is_file bar.t
+ )
+'
+
+# Testcase 12e, Rename/merge of subdirectory into the root
+# Commit O: a/b/foo
+# Commit A: foo
+# Commit B: a/b/foo, a/b/bar
+# Expected: foo, bar
+
+test_expect_success '12e-setup: Rename/merge subdir into the root, variant 2' '
+ test_create_repo 12e &&
+ (
+ cd 12e &&
+
+ mkdir -p a/b &&
+ test_commit a/b/foo &&
+
+ git branch O &&
+ git branch A &&
+ git branch B &&
+
+ git checkout A &&
+ mkdir subdir &&
+ git mv a/b/foo.t foo.t &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git checkout B &&
+ test_commit a/b/bar
+ )
+'
+
+test_expect_success '12e-check: Rename/merge subdir into the root, variant 2' '
+ (
+ cd 12e &&
+
+ git checkout A^0 &&
+
+ git -c merge.directoryRenames=true merge -s recursive B^0 &&
+
+ git ls-files -s >out &&
+ test_line_count = 2 out &&
+
+ git rev-parse >actual \
+ HEAD:foo.t HEAD:bar.t &&
+ git rev-parse >expect \
+ O:a/b/foo.t B:a/b/bar.t &&
+ test_cmp expect actual &&
+
+ git hash-object bar.t >actual &&
+ git rev-parse B:a/b/bar.t >expect &&
+ test_cmp expect actual &&
+
+ test_must_fail git rev-parse HEAD:a/b/foo.t &&
+ test_must_fail git rev-parse HEAD:a/b/bar.t &&
+ test_path_is_missing a/ &&
+ test_path_is_file bar.t
+ )
+'
+
###########################################################################
# SECTION 13: Checking informational and conflict messages
#
--
gitgitgadget
