bin/brew: avoid unnecessary 'readlink' invocation

For typical installations where `brew` is not a symbolic link, this
reduces the number of processes that need to be spawned.

Closes Homebrew/homebrew#46269.

Signed-off-by: Martin Afanasjew <martin@afanasjew.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/bin/brew b/bin/brew
index 37f918b56..9cdeb1a10 100755
--- a/bin/brew
+++ b/bin/brew
@@ -6,9 +6,9 @@ chdir() {
 BREW_FILE_DIRECTORY="$(chdir "${0%/*}" && pwd -P)"
 HOMEBREW_BREW_FILE="$BREW_FILE_DIRECTORY/${0##*/}"
 
-BREW_SYMLINK="$(readlink "$0")"
-if [ -n "$BREW_SYMLINK" ]
+if [ -L "$HOMEBREW_BREW_FILE" ]
 then
+  BREW_SYMLINK="$(readlink "$HOMEBREW_BREW_FILE")"
   BREW_SYMLINK_DIRECTORY="$(dirname "$BREW_SYMLINK")"
   BREW_FILE_DIRECTORY="$(chdir "$BREW_FILE_DIRECTORY" &&
                          chdir "$BREW_SYMLINK_DIRECTORY" && pwd -P)"