Partition: Mask DM/LVM rules, don't stop udev

While partitions are being created and wiped, mask udev rules related to
Device Mapper and LVM to prevent partitions from being activated
automatically. This replaces the previous solution of completely
stopping udev during these operations, which prevented the use of
device names created by the persistent storage rules.

Fixes #105.

src/main/perl/Partition.pm

@@ -625,10 +625,9 @@ sub create_pre_ks
     # make sure this never matches on anything else
     $extended_txt .= "_no_msdos_label" if ($self->{holding_dev}->{label} ne MSDOS);
 
-    # Avoid LVM/mdadm/etc. autodiscovery kicking in after the partition has
-    # been created
-    my $pause_udev = $self->{anaconda_version} >= ANACONDA_VERSION_EL_7_0 ? "udevadm control --stop-exec-queue" : "";
-    my $unpause_udev = $self->{anaconda_version} >= ANACONDA_VERSION_EL_7_0 ? "udevadm control --start-exec-queue" : "";
+    # Avoid LVM/mdadm/etc. autodiscovery kicking in after the partition has been created
+    my $mask_udev_rules = $self->{anaconda_version} >= ANACONDA_VERSION_EL_7_0 ? "find /usr/lib/udev/rules.d/ -type f -name \*.rules | grep -E '(dm|lvm)' | xargs basename -a | xargs -I@ touch /etc/udev/rules.d/@" : "";
+    my $unmask_udev_rules = $self->{anaconda_version} >= ANACONDA_VERSION_EL_7_0 ? "rm -f /etc/udev/rules.d/*.rules" : "";
 
     print <<EOF;
 if ! grep -q '$self->{devname}\$' /proc/partitions
@@ -676,7 +675,7 @@ EOF
     }
     print <<EOF;
     $end_txt
-    $pause_udev
+    $mask_udev_rules
     parted $disk -s -- u s mkpart $self->{type} \$begin \$end
     while true; do
         sleep 1
@@ -692,7 +691,7 @@ EOF
     }
 
     print <<EOF;
-    $unpause_udev
+    $unmask_udev_rules
     udevadm settle
 EOF