fix _getcmdline arg-duplicating bug with /etc/cmdline*

If you unset CMDLINE to make _getcmdline re-read /etc/cmdline and
/etc/cmdline.d/*, CMDLINE_ETC and CMDLINE_ETC_D would keep their
contents.

This is a serious problem if you have (e.g.) "ip=eth0:dhcp" in
/etc/cmdline.d/net.conf, because getargs ip= will return
"ip=eth0:dhcp ip=eth0:dhcp" and then parse-ip-opts.sh will die() because
you have two configurations for eth0.

diff --git a/modules.d/99base/dracut-lib.sh b/modules.d/99base/dracut-lib.sh
index a6b8d1acd4a407458ca85e4c78366a09e0e273d3..ddb695497b018fb36341b65b5053f00dd8aa8674 100755 (executable)
--- a/modules.d/99base/dracut-lib.sh
+++ b/modules.d/99base/dracut-lib.sh
@@ -48,6 +48,7 @@ _getcmdline() {
     local _i
     unset _line
     if [ -z "$CMDLINE" ]; then
+        unset CMDLINE_ETC CMDLINE_ETC_D
         if [ -e /etc/cmdline ]; then
             while read -r _line; do
                 CMDLINE_ETC="$CMDLINE_ETC $_line";