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| author | Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar> | 2012-10-13 14:40:41 -0300 |
|---|---|---|
| committer | Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar> | 2012-10-13 14:40:41 -0300 |
| commit | 1746e31049c50fb413cceeefcf21b2bda4e2de48 (patch) | |
| tree | 9602524f975f2a384b7c578211c29c103c1f8e5a /archiso | |
| parent | 2e94974e2b37b540d52799362f05e16315cb0b00 (diff) | |
| download | archiso32-1746e31049c50fb413cceeefcf21b2bda4e2de48.tar.xz | |
[archiso] Introduce cowfile_size= bootparam
If not set, nothing is changed in current behaviour.
Since dm-snapshot allows to use as "COW" a file with any size,
without caring about the the size of "origin", we can avoid creating a
"COW" file of the same size as the "origin". This is really useful,
when using as cow_device= a filesystem that is VFAT where sparse files
are not supported, so if root-image.fs is 1000M, passing cowfile_size=25%
will create a root-image.cow of 250M instead of 1000M.
Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>
Diffstat (limited to 'archiso')
| -rw-r--r-- | archiso/initcpio/hooks/archiso | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/archiso/initcpio/hooks/archiso b/archiso/initcpio/hooks/archiso index 5b94743..491ed2f 100644 --- a/archiso/initcpio/hooks/archiso +++ b/archiso/initcpio/hooks/archiso @@ -11,13 +11,14 @@ _mnt_fs() { ro_dev=$(losetup --find --show --read-only "${img}") echo ${ro_dev} >> /run/archiso/used_block_devices ro_dev_size=$(blockdev --getsz ${ro_dev}) + rw_dev_size=$((ro_dev_size*cowfile_size/100)) if [[ "${cow_persistent}" == "P" ]]; then if [[ -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow" ]]; then msg ":: Found '/run/archiso/cowspace/${cow_directory}/${img_name}.cow', using as persistent." else msg ":: Creating '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' as persistent." - dd of="/run/archiso/cowspace/${cow_directory}/${img_name}.cow" count=0 seek=${ro_dev_size} &> /dev/null + dd of="/run/archiso/cowspace/${cow_directory}/${img_name}.cow" count=0 seek=${rw_dev_size} &> /dev/null fi else if [[ -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow" ]]; then @@ -25,7 +26,7 @@ _mnt_fs() { rm -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow" fi msg ":: Creating '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' as non-persistent." - dd of="/run/archiso/cowspace/${cow_directory}/${img_name}.cow" count=0 seek=${ro_dev_size} &> /dev/null + dd of="/run/archiso/cowspace/${cow_directory}/${img_name}.cow" count=0 seek=${rw_dev_size} &> /dev/null fi rw_dev=$(losetup --find --show "/run/archiso/cowspace/${cow_directory}/${img_name}.cow") @@ -101,6 +102,11 @@ run_hook() { [[ -z "${archisobasedir}" ]] && archisobasedir="arch" [[ -z "${dm_snap_prefix}" ]] && dm_snap_prefix="arch" [[ -z "${archisodevice}" ]] && archisodevice="/dev/disk/by-label/${archisolabel}" + if [[ -z "${cowfile_size}" ]]; then + cowfile_size="100" + else + cowfile_size=${cowfile_size/%} + fi if [[ -z "${aitab}" ]]; then aitab="/run/archiso/bootmnt/${archisobasedir}/aitab" |