在 2014年7月7日 星期一 11:14:40，Samuli Suominen 写道： > On 07/07/14 07:29, microcai wrote: > > a long ago, /dev/root is an symblic to real root device. no matter it is > > on > > > > NFS or HDD, we can use > > > > /dev/root / auto defaults 0 0 > > > > in fstab to mount / as readwrite. > > > > recently, I recall this old feature, and tryed to use it, but the system > > failed to boot, waiting for /dev/root that never come up. > > > > how to bring back the good old feature that re-use the root device > > assigned on kernel command line ? > > (This is ugly, I know.) > > We restore the /dev/root symlink in Gentoo same way Debian is restoring > it on non-systemd > systems that still use sysvinit using a "workaround" like, > > #!/bin/sh -e > # > # dev-root-link.sh: create /dev/root symlink > # > # Distributed under the terms of the GNU General Public License v2 > # > # This is here because some software expects /dev/root to exist. > # For more information, see this bug: > # https://bugs.gentoo.org/show_bug.cgi?id=438380 > > RULESDIR=/run/udev/rules.d > > [ -d $RULESDIR ] || mkdir -p $RULESDIR > > eval $(udevadm info --export --export-prefix=ROOT_ --device-id-of-file=/ > > || true) > > [ "$ROOT_MAJOR" -a "$ROOT_MINOR" ] || exit 0 > > # btrfs filesystems have bogus major/minor numbers > [ "$ROOT_MAJOR" != 0 ] || exit 0 > > echo 'ACTION=="add|change", SUBSYSTEM=="block", > ENV{MAJOR}=="'$ROOT_MAJOR'", ENV{MINOR}=="'$ROOT_MINOR'", > SYMLINK+="root"' > $RULESDIR/61-dev-root-link.rules >
that hack is bloody urgly, I hate to use that stupid hack. I am not talk about bring back /dev/root, but just a way of refereing "whatever root device specified on kernel commandline" in fstab or in -.mount unit. deserize root filesystem and configure the bootloader, and installation complete. Hate to change target fstab again. also, I think it's rather stupid to specify root device twice, once in boot loader, once in fstab. keeping them sync is a burden. _______________________________________________ systemd-devel mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/systemd-devel
