install_headers: properly quote things

diff --git a/extra/scripts/install_headers.sh b/extra/scripts/install_headers.sh
index dd6bc9a..1b8d9c9 100755 (executable)
--- a/extra/scripts/install_headers.sh
+++ b/extra/scripts/install_headers.sh
@@ -59,10 +59,11 @@ if ! test "$KERNEL_HEADERS" \
        echo "Check KERNEL_HEADERS= in your .config file."
        exit 1
 fi
-# Do the copying only if src and dst dirs are not the same
+# Do the copying only if src and dst dirs are not the same.
 # Be thorough: do not settle just for textual compare,
-# and guard against "pwd" being handled as shell builtin
-if test `(cd "$KERNEL_HEADERS"; env pwd)` != `(cd "$2"; env pwd)`; then
+# and guard against "pwd" being handled as shell builtin.
+# Double quoting looks weird, but it works (even bbox ash too).
+if test "`(cd "$KERNEL_HEADERS"; env pwd)`" != "`(cd "$2"; env pwd)`"; then
        # NB: source or target files and directories may be symlinks,
        # and for all we know, good reasons.
        # We must work correctly in these cases. This includes "do not replace