From 150115aded2e1e0a83db7366f59e4b5bf1aa8135 Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Sun, 22 Mar 2009 15:26:07 -0700 Subject: [PATCH] diff --cached: do not borrow from a work tree when a path is marked as assume-unchanged When the index says that the file in the work tree that corresponds to the blob object that is used for comparison is known to be unchanged, "diff" reads from the file and applies convert_to_git(), instead of inflating the object, to feed the internal diff engine with, because an earlier benchnark found that it tends to be faster to use this optimization. However, the index can lie when the path is marked as assume-unchanged. Disable the optimization for such paths. Signed-off-by: Junio C Hamano --- diff.c | 10 +++++++++- t/t4020-diff-external.sh | 8 ++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/diff.c b/diff.c index bf5d5f15a..c2d277a52 100644 --- a/diff.c +++ b/diff.c @@ -1687,7 +1687,8 @@ static int reuse_worktree_file(const char *name, const unsigned char *sha1, int struct stat st; int pos, len; - /* We do not read the cache ourselves here, because the + /* + * We do not read the cache ourselves here, because the * benchmark with my previous version that always reads cache * shows that it makes things worse for diff-tree comparing * two linux-2.6 kernel trees in an already checked out work @@ -1727,6 +1728,13 @@ static int reuse_worktree_file(const char *name, const unsigned char *sha1, int if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode)) return 0; + /* + * If ce is marked as "assume unchanged", there is no + * guarantee that work tree matches what we are looking for. + */ + if (ce->ce_flags & CE_VALID) + return 0; + /* * If ce matches the file in the work tree, we can reuse it. */ diff --git a/t/t4020-diff-external.sh b/t/t4020-diff-external.sh index 637b4e19d..f853b8a89 100755 --- a/t/t4020-diff-external.sh +++ b/t/t4020-diff-external.sh @@ -107,4 +107,12 @@ test_expect_success 'force diff with "diff"' ' test_cmp ../t4020/diff.NUL actual ' +test_expect_success 'diff --cached' ' + git add file && + git update-index --assume-unchanged file && + echo second >file && + git diff --cached >actual && + test_cmp ../t4020/diff.NUL actual +' + test_done -- 2.30.2