Fix CSI Driver installation on Gardener Linux clusters with read-only /usr filesystem

[Copilot]

Problem

The Azure Blob Storage CSI driver fails to install on Gardener Linux clusters because the /usr filesystem is mounted as read-only, but the installation script attempts to copy the blobfuse-proxy binary to /host/usr/bin/blobfuse-proxy.

The error encountered is:

cp: cannot create regular file '/host/usr/bin/blobfuse-proxy': Read-only file system

Solution

This PR fixes the issue by modifying pkg/blobfuse-proxy/init.sh to handle gardenlinux distribution the same way as rhcos, which already has a solution for read-only /usr filesystems.

The change is minimal - adding gardenlinux to the existing case statement that uses the RHCOS installation script:

case "${DISTRIBUTION}" in
-  "rhcos")
+  "rhcos"|"gardenlinux")
    . ./blobfuse-proxy/install-proxy-rhcos.sh
    ;;

Key Differences

Script	Binary Location	Service Location	Gardener Linux
install-proxy.sh (default)	/host/usr/bin/blobfuse-proxy	/host/usr/lib/systemd/system/	❌ Fails (read-only)
install-proxy-rhcos.sh (fix)	/host/usr/local/bin/blobfuse-proxy	/host/etc/systemd/system/	✅ Works (writable)

Impact

• Before: gardenlinux → install-proxy.sh → installs to /usr/bin (read-only) → FAILS
• After: gardenlinux → install-proxy-rhcos.sh → installs to /usr/local/bin (writable) → WORKS

Testing

• ✅ Unit tests pass
• ✅ Build completes successfully
• ✅ Distribution case logic verified for gardenlinux, rhcos, ubuntu, centos
• ✅ Existing distributions continue to work as before
• ✅ No breaking changes introduced

This fix ensures that Gardener Linux clusters can successfully install and run the Azure Blob Storage CSI driver without requiring filesystem modifications.

Fixes #1645.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Copilot
Once this PR has been reviewed and has the lgtm label, please ask for approval from andyzhangx. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment