From fa137f67a40bbcb3f583920586fdd34ce98ddeaf Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nguy=E1=BB=85n=20Th=C3=A1i=20Ng=E1=BB=8Dc=20Duy?= Date: Sun, 2 Nov 2014 07:24:37 +0100 Subject: lockfile.c: store absolute path MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Locked paths can be saved in a linked list so that if something wrong happens, *.lock are removed. For relative paths, this works fine if we keep cwd the same, which is true 99% of time except: - update-index and read-tree hold the lock on $GIT_DIR/index really early, then later on may call setup_work_tree() to move cwd. - Suppose a lock is being held (e.g. by "git add") then somewhere down the line, somebody calls real_path (e.g. "link_alt_odb_entry"), which temporarily moves cwd away and back. During that time when cwd is moved (either permanently or temporarily) and we decide to die(), attempts to remove relative *.lock will fail, and the next operation will complain that some files are still locked. Avoid this case by turning relative paths to absolute before storing the path in "filename" field. Reported-by: Yue Lin Ho Helped-by: Ramsay Jones Helped-by: Johannes Sixt Signed-off-by: Nguyễn Thái Ngọc Duy Adapted-by: Michael Haggerty Signed-off-by: Michael Haggerty Signed-off-by: Junio C Hamano --- lockfile.c | 14 +++++++++++--- t/t2107-update-index-basic.sh | 15 +++++++++++++++ 2 files changed, 26 insertions(+), 3 deletions(-) diff --git a/lockfile.c b/lockfile.c index 4f16ee78ce..9889277751 100644 --- a/lockfile.c +++ b/lockfile.c @@ -128,9 +128,17 @@ static int lock_file(struct lock_file *lk, const char *path, int flags) path); } - strbuf_add(&lk->filename, path, pathlen); - if (!(flags & LOCK_NO_DEREF)) - resolve_symlink(&lk->filename); + if (flags & LOCK_NO_DEREF) { + strbuf_add_absolute_path(&lk->filename, path); + } else { + struct strbuf resolved_path = STRBUF_INIT; + + strbuf_add(&resolved_path, path, pathlen); + resolve_symlink(&resolved_path); + strbuf_add_absolute_path(&lk->filename, resolved_path.buf); + strbuf_release(&resolved_path); + } + strbuf_addstr(&lk->filename, LOCK_SUFFIX); lk->fd = open(lk->filename.buf, O_RDWR | O_CREAT | O_EXCL, 0666); if (lk->fd < 0) { diff --git a/t/t2107-update-index-basic.sh b/t/t2107-update-index-basic.sh index 1bafb9098c..dfe02f4818 100755 --- a/t/t2107-update-index-basic.sh +++ b/t/t2107-update-index-basic.sh @@ -65,4 +65,19 @@ test_expect_success '--cacheinfo mode,sha1,path (new syntax)' ' test_cmp expect actual ' +test_expect_success '.lock files cleaned up' ' + mkdir cleanup && + ( + cd cleanup && + mkdir worktree && + git init repo && + cd repo && + git config core.worktree ../../worktree && + # --refresh triggers late setup_work_tree, + # active_cache_changed is zero, rollback_lock_file fails + git update-index --refresh && + ! test -f .git/index.lock + ) +' + test_done -- cgit v1.2.1