make nuking mdadm/lvm actually work

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

cdist/conf/type/__install_reset_disk/gencode-remote

@@ -22,38 +22,44 @@ disk="/$__object_id"
 disk_name="${disk##*/}"
 
 cat << DONE
-# stop lvm's if any
-if find /sys/class/block/$disk_name*/holders/ -mindepth 1 | grep -q holders/dm; then
-   if command -v vgchange >/dev/null; then
-      vgchange -a n
-   else
-      echo "WARNING: vgchange command not found" >&2
-   fi
-fi
 
-if command -v pvremove >/dev/null; then
-   pvremove --force --force --yes "$disk" || true
+debug() {
+   echo "[DEBUG] \$@" >&2
+}
+
+find_md_device_names() {
+   local disk_name="\$1"
+   for slave in \$(find /sys/devices/virtual/block/*/slaves/ -name "\${disk_name}*"); do
+      debug "slave: \$slave"
+      for holder in \$slave/holders/*; do
+         debug "holder: \$holder"
+         if [ -d "\$holder/md" ]; then
+            debug "mdadm found at \$holder"
+            holder_name="\${holder##*/}"
+            echo "\$holder_name"
+         fi
+      done
+   done
+}
+
+# disable any enabled volume group
+if command -v vgchange >/dev/null; then
+   vgchange -a n
 else
-   echo "WARNING: pvremove command not found" >&2
+   echo "WARNING: vgchange command not found" >&2
 fi
 
-# stop mdadm raids if any
-if [ -r /proc/mdstat ]; then
-   md_name="\$(awk '/$disk_name/ {print \$1}' /proc/mdstat)"
-   if [ -n "\$md_name" ]; then
-      if command -v mdadm >/dev/null; then
-         mdadm --stop "/dev/\$md_name"
-      else
-         echo "WARNING: mdadm command not found" >&2
-         echo "WARNING: could not stop active mdadm raid for disk $disk" >&2
-      fi
+# disable any running mdadm arrays related to $disk
+for md_name in \$(find_md_device_names "$disk_name" | sort | uniq); do
+   echo "md_name: \$md_name"
+   if command -v mdadm >/dev/null; then
+      mdadm --stop "/dev/\$md_name"
+   else
+      echo "WARNING: mdadm command not found" >&2
+      echo "WARNING: could not stop active mdadm raid for disk $disk" >&2
    fi
-fi
-if command -v mdadm >/dev/null; then
-   mdadm --zero-superblock --force "$disk" || true
-else
-   echo "WARNING: mdadm command not found" >&2
-fi
+done
+
 # clean disks from any legacy signatures
 if command -v wipefs >/dev/null; then
    wipefs -a "$disk" || true