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Avoid rbind /sys for chroot snap pre-seeding (cgroups fail to unmount)

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Builds in LP with the Xenial kernel were happy with the recursive mount of
/sys inside the chroot while performing snap-preseeding but autopkgtests
with the groovy kernel failed.  With the groovy kernel the build was
unable to unmount sys/kernel/slab/*/cgroup/* (Operation not permitted).

This patch mounts /sys and /sys/kernel/security in the chroot in the
same way we've added for binary hooks.  This provides the paths under
/sys needed for snap-preseed while avoiding issues unmounting other
paths.

(cherry picked from commit 84397b50989670c2cfff01de23a5a73e67cd4088)
This commit is contained in:
Robert C Jennings 2020-07-18 16:52:18 -05:00 committed by Dimitri John Ledkov
parent 260c051032
commit e2ae9c245d
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1 changed files with 2 additions and 1 deletions
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live-build/auto/build
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@ -119,7 +119,8 @@ preinstall_snaps() {
fi
mount --rbind /dev chroot/dev
mount --rbind /sys chroot/sys
mount --bind /sys chroot/sys
mount --bind /sys/kernel/security chroot/sys/kernel/security
mount --bind /proc chroot/proc
# Provide more up to date apparmor features, matching target kernel
mount -o bind /usr/share/livecd-rootfs/live-build/apparmor/generic chroot/sys/kernel/security/apparmor/features