Hi Dimitri,
while debugging this I found the following in setup_unionfs() in
scripts/casper:
# move the first mount; no head in busybox-initramfs
for d in $(mount -t squashfs | cut -d\ -f 3); do
mkdir -p "${rootmnt}/rofs"
if [ "${UNIONFS}" = unionfs-fuse ]; then
mount -o bind "${d}" "${rootmnt}/rofs"
else
mount -o move "${d}" "${rootmnt}/rofs"
fi
break
done
and looking at the debug /run/initramfs/initramfs.debug log for the
above stanza I see:
+ cut '-d ' -f 3
+ mount -t squashfs
+ mkdir -p /root/rofs
+ '[' overlay '=' unionfs-fuse ]
+ mount -o move /filesystem.squashfs /root/rofs
+ break
however, when I cannot reproduce this mount -o move operation by hand as
I get the mount error:
mount: /root/rofs: /filesystem.squashfs is not a block device.
It appears to me that the scripts/casper mount seems to silently ignore
this failure. Should the mount be a bind mount instead?
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https://bugs.launchpad.net/bugs/1824407
Title:
remount of multilower moved pivoted-root overlayfs root, results in
I/O errors on some modified files
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