# Run fetch only if $sha1 isn't present or it
# is not reachable from a ref.
(clear_local_git_env; cd "$path" &&
- ((rev=$(git rev-list -n 1 $sha1 --not --all 2>/dev/null) &&
+ ( (rev=$(git rev-list -n 1 $sha1 --not --all 2>/dev/null) &&
test -z "$rev") || git-fetch)) ||
die "Unable to fetch in submodule path '$path'"
fi