Chroot

[cab-1729]

Any idea how to chroot into this from an existing arch setup? Simple arch-chroot doesn't work.

[laurent85v]

Please post more details about what you are trying to do exactly, the commands used and the error messages received.

[cab-1729]

Suppose I create an encrypted, persistent device using this script. With the device attached to my current device, which is running arch, how do I chroot into the portable device. I know the encryption can be managed with:

cryptsetup luksOpen device name
mount /dev/mapper/name /mnt/mountpoint

After that how do I chroot into the device? Normal arch-chroot doesn't work.

[laurent85v]

It's an orverlay filesystem.
https://wiki.archlinux.org/title/Overlay_filesystem

I will post an example with the commands needed to successfully chroot

[cab-1729]

The mount command given in the archwiki doesn't work for some reason:

[cab1729@arch ~]$ doas mount -t overlay overlay -o upperdir=/mnt/ssd/persistent_AUICO_m6x/x86_64/upperdir,workdir=/mnt/ssd/persistent_AUICO_m6x/x86_64/workdir /mnt/merged/
mount: /mnt/merged: wrong fs type, bad option, bad superblock on overlay, missing codepage or helper program, or other error.
       dmesg(1) may have more information after failed mount system call.

[laurent85v]

The lowerdir is missing. Mount the squashfs image airootfs.sfs located in the first partition. Example, assuming usb device /dev/sdb:

$ sudo mkdir /mnt/p1 /mnt/squashfs
$ sudo mount -o ro /dev/sdb1 /mnt/p1
$ sudo mount -o ro,loop /mnt/p1/arch/x86_64/airootfs.sfs /mnt/squashfs

Mount the overlay filesystem :

$ sudo mount -t overlay overlay -o lowerdir=/mnt/squashfs,upperdir=/mnt/ssd/persistent_AUICO_m6x/x86_64/upperdir,workdir=/mnt/ssd/persistent_AUICO_m6x/x86_64/workdir /mnt/merged

Mount the boot partition:

sudo mount /dev/sdb2 /mnt/merged/boot

Chroot:

$ sudo arch-chroot /mnt/merged

[cab-1729]

Niiiiiiice. Thanks.