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merge-recursive: fix merging a subdirectory into the root directory

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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@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren
2019-10-22 21:22:50 +00:00
committed by Junio C Hamano
parent d3eebaad5e
commit 49b8133a9e
2 changed files with 163 additions and 3 deletions
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52
merge-recursive.c
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@ -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