From f55527f80223178d1837bae08addc57bed76d236 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Tue, 21 Oct 2008 09:54:19 -0400 Subject: [PATCH] rm: loosen safety valve for empty files If a file is different between the working tree copy, the index, and the HEAD, then we do not allow it to be deleted without --force. However, this is overly tight in the face of "git add --intent-to-add": $ git add --intent-to-add file $ : oops, I don't actually want to stage that yet $ git rm --cached file error: 'empty' has staged content different from both the file and the HEAD (use -f to force removal) $ git rm -f --cached file Unfortunately, there is currently no way to distinguish between an empty file that has been added and an "intent to add" file. The ideal behavior would be to disallow the former while allowing the latter. This patch loosens the safety valve to allow the deletion only if we are deleting the cached entry and the cached content is empty. This covers the intent-to-add situation, and assumes there is little harm in not protecting users who have legitimately added an empty file. In many cases, the file will still be empty, in which case the safety valve does not trigger anyway (since the content remains untouched in the working tree). Otherwise, we do remove the fact that no content was staged, but given that the content is by definition empty, it is not terribly difficult for a user to recreate it. However, we still document the desired behavior in the form of two tests. One checks the correct removal of an intent-to-add file. The other checks that we still disallow removal of empty files, but is marked as expect_failure to indicate this compromise. If the intent-to-add feature is ever extended to differentiate between normal empty files and intent-to-add files, then the safety valve can be re-tightened. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- builtin-rm.c | 3 ++- cache.h | 1 + read-cache.c | 2 +- t/t3600-rm.sh | 13 +++++++++++++ 4 files changed, 17 insertions(+), 2 deletions(-) diff --git a/builtin-rm.c b/builtin-rm.c index e06640cf8..b7126e3e2 100644 --- a/builtin-rm.c +++ b/builtin-rm.c @@ -79,7 +79,8 @@ static int check_local_mod(unsigned char *head, int index_only) || hashcmp(ce->sha1, sha1)) staged_changes = 1; - if (local_changes && staged_changes) + if (local_changes && staged_changes && + !(index_only && is_empty_blob_sha1(ce->sha1))) errs = error("'%s' has staged content different " "from both the file and the HEAD\n" "(use -f to force removal)", name); diff --git a/cache.h b/cache.h index cdbeb48c6..b0edbf9b9 100644 --- a/cache.h +++ b/cache.h @@ -519,6 +519,7 @@ static inline void hashclr(unsigned char *hash) { memset(hash, 0, 20); } +extern int is_empty_blob_sha1(const unsigned char *sha1); int git_mkstemp(char *path, size_t n, const char *template); diff --git a/read-cache.c b/read-cache.c index fdb41b872..2c450866c 100644 --- a/read-cache.c +++ b/read-cache.c @@ -160,7 +160,7 @@ static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st) return 0; } -static int is_empty_blob_sha1(const unsigned char *sha1) +int is_empty_blob_sha1(const unsigned char *sha1) { static const unsigned char empty_blob_sha1[20] = { 0xe6,0x9d,0xe2,0x9b,0xb2,0xd1,0xd6,0x43,0x4b,0x8b, diff --git a/t/t3600-rm.sh b/t/t3600-rm.sh index 66aca99fd..5b4d6f713 100755 --- a/t/t3600-rm.sh +++ b/t/t3600-rm.sh @@ -187,6 +187,19 @@ test_expect_success 'but with -f it should work.' ' test_must_fail git ls-files --error-unmatch baz ' +test_expect_failure 'refuse to remove cached empty file with modifications' ' + touch empty && + git add empty && + echo content >empty && + test_must_fail git rm --cached empty +' + +test_expect_success 'remove intent-to-add file without --force' ' + echo content >intent-to-add && + git add -N intent-to-add + git rm --cached intent-to-add +' + test_expect_success 'Recursive test setup' ' mkdir -p frotz && echo qfwfq >frotz/nitfol && -- 2.26.2