adding nsenter and ISCSIADM_HOST_STRATEGY variable

README.md

@@ -158,34 +158,15 @@ upgrade all of the nodes in the cluster to get the extension
 talosctl -e <endpoint ip/hostname> -n <node ip/hostname> upgrade --image=ghcr.io/siderolabs/installer:v1.1.1
 ```
 
-since the default [iscsi](https://github.com/democratic-csi/democratic-csi/blob/master/docker/iscsiadm) does not work with talos, this config map is needed to be applied in the same namespace as the democratic-csi installation
-```yaml
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: talos-iscsiadm
-data:
-  iscsiadm: |
-    #!/bin/bash
-    iscsid_pid=$(for proc in /proc/*/cmdline; do grep -q "iscsid -f" <<< $(cat $proc 2>/dev/null | tr "\0" " ") && echo $(basename $(dirname $proc)) && break; done)
-    nsenter --mount="/proc/${iscsid_pid}/ns/mnt" --net="/proc/${iscsid_pid}/ns/net" -- /usr/local/sbin/iscsiadm "${@:1}"
-```
-
 in your `values.yaml` file make sure to enable these settings
 ```yaml
 
 node:
   hostPID: true
-  extraVolumes:
-    - name: talos-iscsiadm
-      configMap:
-        name: talos-iscsiadm
-        defaultMode: 0777
   driver:
-    extraVolumeMounts:
-      - name: talos-iscsiadm
-        mountPath: /usr/local/sbin/iscsiadm
-        subPath: iscsiadm
+    extraEnv:
+      - name: ISCSIADM_HOST_STRATEGY
+        value: nsenter
     iscsiDirHostPath: /usr/local/etc/iscsi
     iscsiDirHostPathCheckDirectory: false
 ```

docker/iscsiadm

@@ -1,5 +1,28 @@
 #!/bin/bash
 
-# https://engineering.docker.com/2019/07/road-to-containing-iscsi/
 
+iscsiadm_host_strategy=$([ $ISCSIADM_HOST_STRATEGY ] && echo $ISCSIADM_HOST_STRATEGY || echo "chroot")
+
+echo "using $iscsiadm_host_strategy strategy"
+
+case $iscsiadm_host_strategy in
+    chroot)
+        # https://engineering.docker.com/2019/07/road-to-containing-iscsi/
         chroot /host /usr/bin/env -i PATH="/usr/sbin:/usr/bin:/sbin:/bin" iscsiadm "${@:1}"
+        ;;
+
+    nsenter)
+        # https://github.com/siderolabs/extensions/issues/38#issuecomment-1125403043
+        iscsid_pid=$(for proc in /proc/*/cmdline; do grep -q "iscsid -f" <<< $(cat $proc 2>/dev/null | tr "\0" " ") && echo $(basename $(dirname $proc)) && break; done)
+        if [ "$iscsid_pid" = "" ]; then
+            echo "could not find the iscsid process"
+            exit 1
+        fi
+        nsenter --mount="/proc/${iscsid_pid}/ns/mnt" --net="/proc/${iscsid_pid}/ns/net" -- /usr/local/sbin/iscsiadm "${@:1}"
+        ;;
+
+    *)
+        echo "$iscsiadm_host_strategy is not a valid strategy, choose either 'chroot' or 'nsenter'"
+        exit 1
+        ;;
+esac