# This file is part of osbuild
#
# A set of rules that implements an inhibition mechanism that allows
# osbuild to suppress the execution of certain udev rules for block
# devices that are known to cause problems for its use case.
#
# osbuild indicates that it wants to inhibit a device by creating a
# lock file in a special lock folder which is then in turn detected
# by this set of rules. As a result various environment variables
# are set that should inhibit the other udev rules.
#
# A udev property called 'OSBUILD_INHIBIT' will be set for devices
# that are inhibited via this set of rules.

SUBSYSTEM!="block", GOTO="osbuild_end"
ACTION=="remove", GOTO="osbuild_end"

# Support locking via device major and minor numbers
TEST=="/run/osbuild/locks/udev/device-$major:$minor", ENV{OSBUILD_INHIBIT}="1"

# Support locking via the "device mapper" device name
ENV{DM_NAME}=="?*", TEST=="/run/osbuild/locks/udev/dm-$env{DM_NAME}", ENV{OSBUILD_INHIBIT}="1"

# Setting `DM_UDEV_DISABLE_OTHER_RULES_FLAG` should prevent the processing
# of the device by device mapper related rules; specifically it should
# prevent lvm2 from scanning the device and activating its volume groups
# and logival volumes.
# On Fedora/RHEL these rules are in '69-dm-lvm-metad.rules'
ENV{OSBUILD_INHIBIT}=="1", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="1"

# Setting `UDEV_DISABLE_PERSISTENT_STORAGE_RULES_FLAG` should opt-out of
# the creation of various links in udev that are useful for host devices
# but are not needed by osbuild and might even conflict if multiple
# concurrent builds are ongoing which use the same device labels, like
# like "disk/by-label".
# On Fedora/RHEL these rules are in '60-persistent-storage.rules'
ENV{OSBUILD_INHIBIT}=="1", ENV{UDEV_DISABLE_PERSISTENT_STORAGE_RULES_FLAG}="1"

LABEL="osbuild_end"