Talk:Install/Chroot

Chrooting from working system?

From 'Chroot into Funtoo' funtoo suggest invoking:

• cd /mnt/funtoo
• mount -t proc none proc
• mount --rbind /sys sys
• mount --rbind /dev dev

Which if invoked from 4.18.18-gentoo-r1 results in:

dreamon / # emerge

Failed to validate a sane '/dev'.

bash process substitution doesn't work; this may be an indication of a broken '/dev/fd'.

and `mount`:

ON CHROOT 
mount: failed to read mtab: No such file or directory

ON SYSTEM
/dev/sda6 on / type btrfs (rw,relatime,ssd,noacl,space_cache,subvolid=5,subvol=/)
devtmpfs on /dev type devtmpfs (rw,nosuid,relatime,size=10240k,nr_inodes=2050263,mode=755)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
tmpfs on /run type tmpfs (rw,nodev,relatime,size=1640628k,mode=755)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
cgroup_root on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,relatime,size=10240k,mode=755)
openrc on /sys/fs/cgroup/openrc type cgroup 
(rw,nosuid,nodev,noexec,relatime,release_agent=/lib/rc/sh/cgroup-release-agent.sh,name=openrc)
none on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate)
cpuset on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cpu on /sys/fs/cgroup/cpu type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
cpuacct on /sys/fs/cgroup/cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct)
freezer on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,nosuid,nodev,noexec,relatime)
/dev/sdb1 on /home type xfs (rw,relatime,attr2,inode64,noquota)
/dev/sda2 on /boot type ext2 (rw,relatime,errors=continue,user_xattr)
none on /run/user/1000 type tmpfs (rw,relatime,mode=700,uid=1000)
sysfs on /mnt/funtoo/sys type sysfs (rw,nosuid,nodev,noexec,relatime)
debugfs on /mnt/funtoo/sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
selinuxfs on /mnt/funtoo/sys/fs/selinux type selinuxfs (rw,relatime)
cgroup_root on /mnt/funtoo/sys/fs/cgroup type tmpfs 
(rw,nosuid,nodev,noexec,relatime,size=10240k,mode=755)
openrc on /mnt/funtoo/sys/fs/cgroup/openrc type cgroup 
(rw,nosuid,nodev,noexec,relatime,release_agent=/lib/rc/sh/cgroup-release-agent.sh,name=openrc)
none on /mnt/funtoo/sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate)
cpuset on /mnt/funtoo/sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cpu on /mnt/funtoo/sys/fs/cgroup/cpu type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
cpuacct on /mnt/funtoo/sys/fs/cgroup/cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct)
freezer on /mnt/funtoo/sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
/dev/sdb1 on /mnt/funtoo/home type xfs (rw,relatime,attr2,inode64,noquota)
devtmpfs on /mnt/funtoo/dev type devtmpfs (rw,nosuid,relatime,size=10240k,nr_inodes=2050263,mode=755)
mqueue on /mnt/funtoo/dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
devpts on /mnt/funtoo/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
shm on /mnt/funtoo/dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime)

both (mount+emerge err) was fixed by invoking chroot based on https://wiki.gentoo.org/wiki/Chroot#Configuration

Probably should be included in the funtoo handbook?

EDIT: Command used for chroot was "sudo chroot /mnt/funtoo /bin/bash"

-Kreyren (talk) 07:45, January 28, 2019 (UTC)

Same issue, and can be resolved via changing 'mount --rbind /sys sys' to 'mount --rbind /sys /mnt/funtoo/sys' -Jeon (talk) April 15, 2021 (UTC)