apply "ro" and "rw" options from cmdline to / mount

rflags is no longer guaranteed to be non empty.  / is mounted according
to rootflags parameter but forced ro at first.  Later it is remounted
according to /etc/fstab + rootflags parameter and "ro"/"rw".  If
parameters are still the same as for first mount, / isn't remounted.

Conflicts:

    modules.d/95rootfs-block/mount-root.sh
    modules.d/99base/parse-root-opts.sh

modules.d/95rootfs-block/mount-root.sh

@@ -5,32 +5,13 @@
 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
 type det_fs >/dev/null 2>&1 || . /lib/fs-lib.sh
 
-filter_rootopts() {
-    rootopts=$1
-    # strip ro and rw options
-    local OLDIFS="$IFS"
-    IFS=,
-    set -- $rootopts
-    IFS="$OLDIFS"
-    local v
-    while [ $# -gt 0 ]; do
-        case $1 in
-            defaults);;
-            *)
-                v="$v,${1}";;
-        esac
-        shift
-    done
-    rootopts=${v#,}
-    echo $rootopts
-}
-
 mount_root() {
     local _ret
+    local _rflags_ro="$rflags,ro"
     # sanity - determine/fix fstype
     rootfs=$(det_fs "${root#block:}" "$fstype")
-    while ! mount -t ${rootfs} -o "$rflags",ro "${root#block:}" "$NEWROOT"; do
-        warn "Failed to mount -t ${rootfs} -o $rflags,ro ${root#block:} $NEWROOT"
+    while ! mount -t ${rootfs} -o "$_rflags_ro" "${root#block:}" "$NEWROOT"; do
+        warn "Failed to mount -t ${rootfs} -o $_rflags_ro ${root#block:} $NEWROOT"
         fsck_ask_err
     done
 
@@ -96,13 +77,13 @@ mount_root() {
                 break
             fi
         done < "$NEWROOT/etc/fstab"
-
-        rootopts=$(filter_rootopts $rootopts)
     fi
 
     # we want rootflags (rflags) to take precedence so prepend rootopts to
-    # them; rflags is guaranteed to not be empty
-    rflags="${rootopts:+${rootopts},}${rflags}"
+    # them
+    rflags="${rootopts},${rflags}"
+    rflags="${rflags#,}"
+    rflags="${rflags%,}"
 
     # backslashes are treated as escape character in fstab
     # esc_root=$(echo ${root#block:} | sed 's,\\,\\\\,g')
@@ -125,7 +106,7 @@ mount_root() {
     if ! ismounted "$NEWROOT"; then
         info "Mounting ${root#block:} with -o ${rflags}"
         mount "$NEWROOT" 2>&1 | vinfo
-    else
+    elif ! are_lists_eq , "$rflags" "$_rflags_ro" defaults; then
         info "Remounting ${root#block:} with -o ${rflags}"
         mount -o remount "$NEWROOT" 2>&1 | vinfo
     fi

modules.d/99base/parse-root-opts.sh

@@ -4,13 +4,10 @@
 
 root=$(getarg root=)
 
-if rflags="$(getarg rootflags=)"; then
-    getarg rw && rflags="${rflags},rw"
-    getarg ro && rflags="${rflags},ro"
-else
-    getarg rw && rflags=rw
-    getarg ro && rflags=ro
-fi
+rflags="$(getarg rootflags=)"
+getargbool 0 rw && rflags="${rflags},rw"
+getargbool 0 ro && rflags="${rflags},ro"
+rflags="${rflags#,}"
 
 fstype="$(getarg rootfstype=)"
 if [ -z "$fstype" ]; then