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authorGerardo Exequiel Pozzi <vmlinuz386@gmail.com>2015-01-27 14:37:05 -0300
committerGerardo Exequiel Pozzi <vmlinuz386@gmail.com>2015-01-27 14:37:05 -0300
commita637bdb8574168ab4cddef13d5de7f458650bda5 (patch)
treeec3b5bb312b9c1f987d6a14a3e996a1dad4eef3d /archiso/mkarchiso
parentfe29d5f334608f5ae93a40d4947aab1cb8517340 (diff)
[archiso] Add optional OverlayFS support
This is the first attemp to test overlayfs in archiso. The current dm-snapshot mode is keep and is enabled by default, while the new mode is enabled via "-s sfs" to mkarchiso. No new boot parameters are added, since archiso hooks detects if the .sfs file is for dm-snapshot (airootfs.img inside) or for overlayfs. Persistence is supported in overlayfs mode using the same options (cowlabel or cowdevice), but warning while in dm-snapshot mode, only one file is used (airootfs.cow), in overlayfs mode internal files for workdir/ and upperdir/ are allocated, so you can not use VFAT or NTFS. To test this, you need to enable [testing] in pacman.conf from releng profile and edit build.sh then add "-s sfs" in make_prepare() Look at: setarch ${arch} mkarchiso ${verbose} -w "${work_dir}" -D "${install_dir}" prepare Replace with: setarch ${arch} mkarchiso ${verbose} -w "${work_dir}" -s sfs -D "${install_dir}" prepare The build requires just half of space that the build for dm-snapshot, since there is no ext4 img ;) Just to remember: there is no space gain in .sfs (just about 2M) There is at least one thing during boot with machine-id service: Dec 24 03:31:39 archiso systemd-machine-id-commit[183]: Failed to unmount transient /etc/machine-id file in our private namespace: Invalid argument Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>
Diffstat (limited to 'archiso/mkarchiso')
-rwxr-xr-xarchiso/mkarchiso34
1 files changed, 30 insertions, 4 deletions
diff --git a/archiso/mkarchiso b/archiso/mkarchiso
index 5643525..0da02b0 100755
--- a/archiso/mkarchiso
+++ b/archiso/mkarchiso
@@ -16,6 +16,7 @@ iso_application="Arch Linux Live/Rescue CD"
install_dir="arch"
work_dir="work"
out_dir="out"
+sfs_mode="img"
sfs_comp="xz"
# Show an INFO message
@@ -87,6 +88,10 @@ _usage ()
echo " Default: '${work_dir}'"
echo " -o <out_dir> Set the output directory"
echo " Default: '${out_dir}'"
+ echo " -s <sfs_mode> Set SquashFS image mode (img or sfs)"
+ echo " img: prepare airootfs.sfs for dm-snapshot usage"
+ echo " sfs: prepare airootfs.sfs for overlayfs usage"
+ echo " Default: ${sfs_mode}"
echo " -c <comp_type> Set SquashFS compression type (gzip, lzma, lzo, xz)"
echo " Default: '${sfs_comp}'"
echo " -v Enable verbose output"
@@ -193,8 +198,8 @@ _cleanup () {
_msg_info "Done!"
}
-# Makes a filesystem from a source directory.
-_mkairootfs () {
+# Makes a ext4 filesystem inside a SquashFS from a source directory.
+_mkairootfs_img () {
if [[ ! -e "${work_dir}/airootfs" ]]; then
_msg_error "The path '${work_dir}/airootfs' does not exist" 1
fi
@@ -224,6 +229,22 @@ _mkairootfs () {
rm ${work_dir}/airootfs.img
}
+# Makes a SquashFS filesystem from a source directory.
+_mkairootfs_sfs () {
+ if [[ ! -e "${work_dir}/airootfs" ]]; then
+ _msg_error "The path '${work_dir}/airootfs' does not exist" 1
+ fi
+
+ mkdir -p "${work_dir}/iso/${install_dir}/${arch}"
+ _msg_info "Creating SquashFS image, this may take some time..."
+ if [[ "${quiet}" = "y" ]]; then
+ mksquashfs "${work_dir}/airootfs" "${work_dir}/iso/${install_dir}/${arch}/airootfs.sfs" -noappend -comp "${sfs_comp}" -no-progress &> /dev/null
+ else
+ mksquashfs "${work_dir}/airootfs" "${work_dir}/iso/${install_dir}/${arch}/airootfs.sfs" -noappend -comp "${sfs_comp}" -no-progress
+ fi
+ _msg_info "Done!"
+}
+
_mkchecksum () {
_msg_info "Creating checksum file for self-test..."
cd "${work_dir}/iso/${install_dir}/${arch}"
@@ -292,7 +313,11 @@ command_prepare () {
_show_config prepare
_cleanup
- _mkairootfs
+ if [[ ${sfs_mode} == "sfs" ]]; then
+ _mkairootfs_sfs
+ else
+ _mkairootfs_img
+ fi
_mkchecksum
}
@@ -330,7 +355,7 @@ if [[ ${EUID} -ne 0 ]]; then
_msg_error "This script must be run as root." 1
fi
-while getopts 'p:r:C:L:P:A:D:w:o:c:vh' arg; do
+while getopts 'p:r:C:L:P:A:D:w:o:s:c:vh' arg; do
case "${arg}" in
p) pkg_list="${pkg_list} ${OPTARG}" ;;
r) run_cmd="${OPTARG}" ;;
@@ -341,6 +366,7 @@ while getopts 'p:r:C:L:P:A:D:w:o:c:vh' arg; do
D) install_dir="${OPTARG}" ;;
w) work_dir="${OPTARG}" ;;
o) out_dir="${OPTARG}" ;;
+ s) sfs_mode="${OPTARG}" ;;
c) sfs_comp="${OPTARG}" ;;
v) quiet="n" ;;
h|?) _usage 0 ;;