Bug#731796: dmsetup udev rules: please enable watch option

[Michael Stapelberg]

Package: dmsetup
Version: 2:1.02.77-6+b1
Severity: normal
Tags: patch

Dear dmsetup maintainers,

when debugging #731208 and #712439 I noticed that dmsetup in Debian does
not ship an important bit of the upstream rules files (specifically
udev/13-dm-disk.rules.in): The OPTIONS+="watch" for device mapper
devices is not included.

Enabling the watch option (which will generate a udev event once the
device is closed after being open for writing) is crucial for an
event-based boot with encrypted swap. After setting up the encryption
with a random key, the init system (systemd in this case) calls mkswap
and waits for the event to arrive. Once it gets notified, it calls
swapon.

Therefore, I ask you to please apply this patch to your rules, or make
the change in any other way you see fit, as long as the watch option
gets enabled:

--- /lib/udev/rules.d/55-dm.rules 2013-08-07 09:45:01.000000000 -0400
+++ /root/55-dm.rules             2013-12-08 10:12:48.104015288 -0500
@@ -98,6 +98,8 @@
 # and 'DM subsystem' related rules enabled in this case.
 ENV{DM_SUSPENDED}=="1", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="1"

+OPTIONS+="watch"
+
 GOTO="dm_end"

 LABEL="dm_disable"

Thank you,
Best regards,
Michael

-- System Information:
Debian Release: 7.0
  APT prefers testing
  APT policy: (990, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: armel
i386

Kernel: Linux 3.12.3 (SMP w/8 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages dmsetup depends on:
ii  libc6               2.17-93
ii  libdevmapper1.02.1  2:1.02.74-6
ii  libudev0            175-7.1
ii  util-linux          2.20.1-5.3

dmsetup recommends no packages.

dmsetup suggests no packages.

-- no debconf information