What's the way to install Debian Live on an LVM logical volume?
I know that neither kernel nor initramfs image can reside on an
LVM volume since the bootloaders don't support these, thus a
separate partition would be necessary for them (not to mention
the bootloader's files.) However, having Debian Live installed
on an Ext3 filesystem on top of an LVM volume seems to have at
least the following benefits:
* the filesystem could be expanded or reduced dynamically (with
lvreduce(8), lvextend(8) and ext2online(8); it's important for
space-scarce media, such as USB Flash drives;
* the filesystem could be updated by Rsync, overwriting only the
files that were actually changed, thus saving the write cycles
resource; it's again important for space-scarce media;
* arbitrary number of Live images could be installed on the same
media.
On the other hand, Ext3 would probably be much less
space-efficient than Squashfs.
Anyway, IIUC, the only steps to do to make it happen (as of
initramfs-tools 0.92j) are:
* enable LVM on the `live-premount' stage, or earlier, as by
duplicating scripts/local-top/lvm2 also in live-premount/ (but
it should be ensured that it's run only after all the media
are detected by the kernel);
* make a new meaning for the `root=' option when given without
`plainroot', roughly:
--- scripts/live.~1~
+++ scripts/live
@@ -1408,6 +1408,15 @@
then
# Do a local boot from hd
livefs_root=${ROOT}
+ elif [ -n "${ROOT}" ]
+ then
+ ## do a local mount
+ log_begin_msg "Mounting live ${ROOT} to ${mountpoint}"
+ if mount -t ext3 -o ro,noatime "${ROOT}"
"${mountpoint}" ; then
+ livefs_root=${mountpoint}
+ else
+ panic "Unable to mount ${ROOT}"
+ fi
else
# Scan local devices for the image
for i in 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
19
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