Allow usage of PVCTemplate as storage pool source. (#175)

* Add mounter binary that attempts to mount a volume on the host so
the hostpath provisioner can use it.

Signed-off-by: Alexander Wels <awels@redhat.com>

* Refactor unit tests.
Add unit tests for storage pool.
Refactor mounter to be easier to read.

Signed-off-by: Alexander Wels <awels@redhat.com>

* Refactored mounter so it will remount if something unmounts the mount.

Signed-off-by: Alexander Wels <awels@redhat.com>

* Added unmounting when deployment is no longer available on a node.

Signed-off-by: Alexander Wels <awels@redhat.com>

* generated crd files

Signed-off-by: Alexander Wels <awels@redhat.com>

* Moved PVCTemplate up to the storage pool level.

Signed-off-by: Alexander Wels <awels@redhat.com>

* Add SA to mount and unmount deployment/job

Signed-off-by: Alexander Wels <awels@redhat.com>

* Don't clobber existing finalizers, add/remove properly.

Signed-off-by: Alexander Wels <awels@redhat.com>

* Don't remove finalizer from hpp until all the unmount jobs finish

Signed-off-by: Alexander Wels <awels@redhat.com>

* Delete daemonset and deployments associated with SA instead of pods.

Signed-off-by: Alexander Wels <awels@redhat.com>

Dockerfile

@@ -1,6 +1,10 @@
 FROM registry.fedoraproject.org/fedora-minimal:34
+
+RUN microdnf install -y xfsprogs
+
 COPY _out/hostpath-provisioner-operator /usr/bin/hostpath-provisioner-operator
 COPY _out/csv-generator /usr/bin/csv-generator
+COPY _out/mounter /usr/bin/mounter
 COPY _out/version.txt /version.txt
 ENV PATH=/usr/bin
 ENTRYPOINT ["hostpath-provisioner-operator"]

Makefile

@@ -21,14 +21,17 @@ all: test build
 operator:
 	GOLANG_VER=${GOLANG_VER} ./hack/build-operator.sh
 
+mounter:
+	GOLANG_VER=${GOLANG_VER} ./hack/build-mounter.sh
+
 csv-generator:
 	GOLANG_VER=${GOLANG_VER} ./hack/build-csv-generator.sh
 
 crd-generator: generate-crd
 	GOLANG_VER=${GOLANG_VER} ./hack/build-crd-generator.sh
 	_out/crd-generator --sourcefile=./deploy/operator.yaml --outputDir=./tools/helper
 
-image: operator csv-generator
+image: operator mounter csv-generator
 	TAG=$(TAG) ./hack/version.sh ./_out; \
 	docker build -t $(DOCKER_REPO)/$(OPERATOR_IMAGE):$(TAG) -f Dockerfile .
 

cmd/mounter/chroot.go

@@ -0,0 +1,42 @@
+/*
+Copyright 2021 The hostpath provisioner operator Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"os"
+	"syscall"
+)
+
+func chroot(path string) (func() error, error) {
+	root, err := os.Open("/")
+	if err != nil {
+		return nil, err
+	}
+
+	if err := syscall.Chroot(path); err != nil {
+		root.Close()
+		return nil, err
+	}
+
+	return func() error {
+		defer root.Close()
+		if err := root.Chdir(); err != nil {
+			return err
+		}
+		return syscall.Chroot(".")
+	}, nil
+}