Workaround cloud-init hotplug issue

cloud-init added a hook which triggers on every device add/rm
event, which results in holding open devices for a while after
they're created/destroyed.

So let's shove an exclusion rule for that into the GH workflows
until it gets fixed.

Closes: openzfs#12644

Signed-off-by: Rich Ercolani <rincebrain@gmail.com>

.github/workflows/zfs-tests-functional.yml

@@ -45,6 +45,16 @@ jobs:
         sudo sed -i.bak 's/updates/extra updates/' /etc/depmod.d/ubuntu.conf
         sudo depmod
         sudo modprobe zfs
+        # Workaround for cloud-init bug
+        # see https://github.com/openzfs/zfs/issues/12644
+        FILE=/lib/udev/rules.d/10-cloud-init-hook-hotplug.rules
+        if [ -r "${FILE}" ]; then
+          HASH=$(md5sum "${FILE}" | awk '{ print $1 }')
+          if cmp -s "${HASH}" "121ff0ef1936cd2ef65aec0458a35772" ; then
+            # Just shove a zd* exclusion right above the hotplug hook...
+            sed -i -e s/'LABEL="cloudinit_hook"'/'KERNEL=="zd*", GOTO="cloudinit_end"\n&'/ "${FILE}"
+          fi
+        fi
         # Workaround to provide additional free space for testing.
         #   https://github.com/actions/virtual-environments/issues/2840
         sudo rm -rf /usr/share/dotnet

.github/workflows/zfs-tests-sanity.yml

@@ -41,6 +41,16 @@ jobs:
         sudo sed -i.bak 's/updates/extra updates/' /etc/depmod.d/ubuntu.conf
         sudo depmod
         sudo modprobe zfs
+        # Workaround for cloud-init bug
+        # see https://github.com/openzfs/zfs/issues/12644
+        FILE=/lib/udev/rules.d/10-cloud-init-hook-hotplug.rules
+        if [ -r "${FILE}" ]; then
+          HASH=$(md5sum "${FILE}" | awk '{ print $1 }')
+          if cmp -s "${HASH}" "121ff0ef1936cd2ef65aec0458a35772" ; then
+            # Just shove a zd* exclusion right above the hotplug hook...
+            sed -i -e s/'LABEL="cloudinit_hook"'/'KERNEL=="zd*", GOTO="cloudinit_end"\n&'/ "${FILE}"
+          fi
+        fi
         # Workaround to provide additional free space for testing.
         #   https://github.com/actions/virtual-environments/issues/2840
         sudo rm -rf /usr/share/dotnet