add fakeudev

Signed-off-by: Zen <[email protected]>

Author: desultory

src/ugrd/fs/fakeudev.py

@@ -0,0 +1,22 @@
+"""
+UDEV is amazing and well desinged software.
+
+In order to make systemd not time out on boot, we need to fake it.
+To do this, we simply need to read /sys/block/dm-*/uevent,
+We can then write 'E:DM_UDEV_PRIMARY_SOURCE_FLAG=1\n' to each:
+    /run/udev/data/b<MAJOR>:<MINOR>.
+This will make systemd think that udev is working and not time out.
+"""
+
+
+def fake_dm_udev(self):
+    """
+    returns a bash script to fake udev for dm devices.
+    calls _make_fake_dm_udev_db for each dm device.
+    """
+    return ['for dm in /sys/block/dm-*; do',
+            '    source "${dm}/uevent"',
+            '    einfo "Faking udev for ${DEVNAME}"',
+            '    udev_db_file="/run/udev/data/b${MAJOR}:${MINOR}"',
+            "    echo -e 'E:DM_UDEV_PRIMARY_SOURCE_FLAG=1\n' > ${udev_db_file}",
+            'done']

src/ugrd/fs/fakeudev.toml

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+[imports.init_mount_late]
+'ugrd.fs.fakeudev' = ['fake_dm_udev']