From 6aaeca900b05a8265d1930d3dc0a2df19002771f Mon Sep 17 00:00:00 2001 From: Jeff King Date: Fri, 29 Apr 2011 18:24:32 -0400 Subject: [PATCH] merge-one-file: fix broken merges with alternate work trees The merge-one-file tool predates the invention of GIT_WORK_TREE. By the time GIT_WORK_TREE was invented, most people were using the merge-recursive strategy, which handles resolving internally. Therefore these features have had very little testing together. For the most part, merge-one-file just works with GIT_WORK_TREE; most of its heavy lifting is done by plumbing commands which do respect GIT_WORK_TREE properly. The one exception is a shell redirection which touches the worktree directly, writing results to the wrong place in the presence of a GIT_WORK_TREE variable. This means that merges won't even fail; they will silently produce incorrect results, throwing out the entire "theirs" side of files which need content-level merging! This patch makes merge-one-file chdir to the toplevel of the working tree (and exit if we don't have one). This most closely matches the assumption made by the original script (before separate work trees were invented), and matches what happens when the script is called as part of a merge strategy. While we're at it, we'll also error-check the call to cat. Merging a file in a subdirectory could in fact fail, as the redirection relies on the "checkout-index" call just prior to create leading directories. But we never noticed, since we ignored the error return from running cat. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- git-merge-one-file.sh | 7 ++++++- t/t6060-merge-index.sh | 4 ++-- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/git-merge-one-file.sh b/git-merge-one-file.sh index d067894bf4..bb64a72ad3 100755 --- a/git-merge-one-file.sh +++ b/git-merge-one-file.sh @@ -22,6 +22,11 @@ LONG_USAGE="Usage: git merge-one-file $USAGE Blob ids and modes should be empty for missing files." +SUBDIRECTORY_OK=Yes +. git-sh-setup +cd_to_toplevel +require_work_tree + if ! test "$#" -eq 7 then echo "$LONG_USAGE" @@ -132,7 +137,7 @@ case "${1:-.}${2:-.}${3:-.}" in # Create the working tree file, using "our tree" version from the # index, and then store the result of the merge. - git checkout-index -f --stage=2 -- "$4" && cat "$src1" >"$4" + git checkout-index -f --stage=2 -- "$4" && cat "$src1" >"$4" || exit 1 rm -f -- "$orig" "$src1" "$src2" if [ "$6" != "$7" ]; then diff --git a/t/t6060-merge-index.sh b/t/t6060-merge-index.sh index 895f079c92..debadbd299 100755 --- a/t/t6060-merge-index.sh +++ b/t/t6060-merge-index.sh @@ -68,7 +68,7 @@ test_expect_success 'merge-one-file fails without a work tree' ' ) ' -test_expect_failure 'merge-one-file respects GIT_WORK_TREE' ' +test_expect_success 'merge-one-file respects GIT_WORK_TREE' ' (cd bare.git && mkdir work && GIT_WORK_TREE=$PWD/work && @@ -82,7 +82,7 @@ test_expect_failure 'merge-one-file respects GIT_WORK_TREE' ' test_cmp expect-merged bare.git/work/file-index ' -test_expect_failure 'merge-one-file respects core.worktree' ' +test_expect_success 'merge-one-file respects core.worktree' ' mkdir subdir && git clone . subdir/child && (cd subdir &&