From f7ee88f1d09ce47b8e12b52a2f19c7867ae10b29 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Mon, 14 Jun 2021 12:41:52 +0000 Subject: subtree: fix the GIT_EXEC_PATH sanity check to work on Windows In 22d550749361 (subtree: don't fuss with PATH, 2021-04-27), `git subtree` was broken thoroughly on Windows. The reason is that it assumes Unix semantics, where `PATH` is colon-separated, and it assumes that `$GIT_EXEC_PATH:` is a verbatim prefix of `$PATH`. Neither are true, the latter in particular because `GIT_EXEC_PATH` is a Windows-style path, while `PATH` is a Unix-style path list. Let's make extra certain that `$GIT_EXEC_PATH` and the first component of `$PATH` refer to different entities before erroring out. We do that by using the `test -ef ` command that verifies that the inode of `` and of `` is the same. Sadly, this construct is non-portable, according to https://pubs.opengroup.org/onlinepubs/009695399/utilities/test.html. However, it does not matter in practice because we still first look whether `$GIT_EXEC_PREFIX` is string-identical to the first component of `$PATH`. This will give us the expected result everywhere but in Git for Windows, and Git for Windows' own Bash _does_ handle the `-ef` operator. Just in case that we _do_ need to show the error message _and_ are running in a shell that lacks support for `-ef`, we simply suppress the error output for that part. This fixes https://github.com/git-for-windows/git/issues/3260 Signed-off-by: Johannes Schindelin Signed-off-by: Junio C Hamano --- contrib/subtree/git-subtree.sh | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh index b06782bc79..3935cea7dd 100755 --- a/contrib/subtree/git-subtree.sh +++ b/contrib/subtree/git-subtree.sh @@ -5,7 +5,10 @@ # Copyright (C) 2009 Avery Pennarun # -if test -z "$GIT_EXEC_PATH" || test "${PATH#"${GIT_EXEC_PATH}:"}" = "$PATH" || ! test -f "$GIT_EXEC_PATH/git-sh-setup" +if test -z "$GIT_EXEC_PATH" || ! test -f "$GIT_EXEC_PATH/git-sh-setup" || { + test "${PATH#"${GIT_EXEC_PATH}:"}" = "$PATH" && + test ! "$GIT_EXEC_PATH" -ef "${PATH%%:*}" 2>/dev/null +} then echo >&2 'It looks like either your git installation or your' echo >&2 'git-subtree installation is broken.' -- cgit v1.2.3