From: Jeff King Date: Tue, 13 May 2008 08:46:38 +0000 (-0400) Subject: filter-branch: fix variable export logic X-Git-Tag: v1.5.6-rc0~61 X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=0bdf93cbf0afd568384f237378ba368e751a2f0f;p=git.git filter-branch: fix variable export logic filter-branch tries to restore "old" copies of some environment variables by using the construct: unset var test -z "$old_var" || var="$old_var" && export var This is just wrong. AND-list and OR-list operators && and || have equal precedence and they bind left to right. The second term, var="$old" assignment always succeeds, so we always end up exporting var. On bash and dash, exporting an unset variable has no effect. However, on some shells (such as FreeBSD's /bin/sh), the shell exports the empty value. This manifested itself in this case as git-filter-branch setting GIT_INDEX_FILE to the empty string, which in turn caused its call to git-read-tree to fail, leaving the working tree pointing at the original HEAD instead of the rewritten one. To fix this, we change the short-circuit logic to better match the intent: test -z "$old_var" || { var="$old_var" && export var } Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- diff --git a/git-filter-branch.sh b/git-filter-branch.sh index 333f6a8f3..80e99e539 100755 --- a/git-filter-branch.sh +++ b/git-filter-branch.sh @@ -435,11 +435,17 @@ rm -rf "$tempdir" trap - 0 unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE -test -z "$ORIG_GIT_DIR" || GIT_DIR="$ORIG_GIT_DIR" && export GIT_DIR -test -z "$ORIG_GIT_WORK_TREE" || GIT_WORK_TREE="$ORIG_GIT_WORK_TREE" && +test -z "$ORIG_GIT_DIR" || { + GIT_DIR="$ORIG_GIT_DIR" && export GIT_DIR +} +test -z "$ORIG_GIT_WORK_TREE" || { + GIT_WORK_TREE="$ORIG_GIT_WORK_TREE" && export GIT_WORK_TREE -test -z "$ORIG_GIT_INDEX_FILE" || GIT_INDEX_FILE="$ORIG_GIT_INDEX_FILE" && +} +test -z "$ORIG_GIT_INDEX_FILE" || { + GIT_INDEX_FILE="$ORIG_GIT_INDEX_FILE" && export GIT_INDEX_FILE +} git read-tree -u -m HEAD exit $ret