From 01247e0299b34b9b46d96d5850a24583e39deabe Mon Sep 17 00:00:00 2001
From: LE Manh Cuong <cuong.manhle.vn@gmail.com>
Date: Sun, 19 Jun 2016 03:26:03 +0700
Subject: [PATCH] sh-setup: enclose setting of ${VAR=default} in double-quotes
We often make sure an environment variable is set to
something, either set by the user (in which case we do not
molest it) or set it to our default value (otherwise), with
: ${VAR=default value}
i.e. running the no-op command ":" with ${VAR} as its
parameters (or the default value we supply), relying on that
":" is a no-op.
This pattern, even though it is no-op from correctness point
of view, still can be expensive if the existing value in VAR
has shell glob (because they will be expanded against
filesystem entities) and IFS whitespaces (because the value
need to be split into multiple parameters). Our invocation
of ":" command does not care if the parameter given to it is
after the value in VAR goes through these processing.
Enclosing the whole thing in double-quote, i.e.
: "${VAR=default value}"
avoids paying the unnecessary cost, so let's do so.
Signed-off-by: LE Manh Cuong <cuong.manhle.vn@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
git-sh-setup.sh | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index 4691fbcb64..c918ed779b 100644
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -160,8 +160,8 @@ git_pager() {
else
GIT_PAGER=cat
fi
- : ${LESS=-FRX}
- : ${LV=-c}
+ : "${LESS=-FRX}"
+ : "${LV=-c}"
export LESS LV
eval "$GIT_PAGER" '"$@"'
@@ -344,7 +344,7 @@ git_dir_init () {
echo >&2 "Unable to determine absolute path of git directory"
exit 1
}
- : ${GIT_OBJECT_DIRECTORY="$(git rev-parse --git-path objects)"}
+ : "${GIT_OBJECT_DIRECTORY="$(git rev-parse --git-path objects)"}"
}
if test -z "$NONGIT_OK"