On Thu, 21.04.16 16:06, Michael Biebl (mbi...@gmail.com) wrote: > Hi Lennart > > 2016-04-21 12:11 GMT+02:00 Lennart Poettering <lenn...@poettering.net>: > > On Thu, 21.04.16 02:50, Michael Biebl (mbi...@gmail.com) wrote: > > > >> 2016-04-21 0:56 GMT+02:00 Michael Biebl <mbi...@gmail.com>: > >> On second thought, maybe not such a good idea as this would break > >> hibernate on alternate initramfs generators, like initramfs-tools, > >> which don't require resume= to be set on the kernel command line. > > > > So, what does initramfs-tools do instead? Does it actively search for > > a hibernation partition? And how long does it look for one? Or does it > > write the resume partition into the initrd image? > > Our installer creates a file > /etc/initramfs-tools/conf.d/resume which contains the name of the swap > partition that was created during system installation. > This file is embedded in the initramfs and used to resume the system > from hibernate. > http://anonscm.debian.org/cgit/kernel/initramfs-tools.git/tree/hooks/resume#n19
Does Debian also embedd the root disk name in the initrd? Or does it do so only for the resume partition? > Such a file looks like > $ cat /etc/initramfs-tools/conf.d/resume > RESUME=UUID=c0d2bc19-898f-4306-a734-85e547e249f0 > > But it also does some autodetection, if RESUME is not set. > http://anonscm.debian.org/cgit/kernel/initramfs-tools.git/tree/hooks/resume#n42 But that's not boot-time autodetection but initrd-rebuild-time autodetection? In general I think for systemd we should really optimize things so that as little system-specific info needs to be carried in the initrd as possible. In fact I think, having exactly zero system-specific information in it is a good goal, so that initrds can be generated nicely at compile-time instead of on the system itself. And for that I think two strategies are nice: a) Require devices to be configured on the kernel cmdline, via root= and resume= and b) Autodetect devices at boot, automatically deriving them from the selected boot device, i.e. look for properly tagged partitions on the same harddisk as the ESP. Lennart -- Lennart Poettering, Red Hat _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
