[arch-releng] [RFC] [PATCH] [archiso2dual] Add support for squashfs compression types

[Gerardo Exequiel Pozzi]

Add -c option with defaults to 'auto' thats autodetect current compression type
of squashfs images to be processed.

Add a note about supported status in Linux versions.
Needs squashfs-tools-4.1 (now on extra).

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386 at yahoo.com.ar>
---
 archiso2dual/archiso2dual |   19 ++++++++++++++++---
 1 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/archiso2dual/archiso2dual b/archiso2dual/archiso2dual
index 5b17b4a..f34f078 100755
--- a/archiso2dual/archiso2dual
+++ b/archiso2dual/archiso2dual
@@ -19,6 +19,7 @@ work_dir="/tmp/archiso2dual"
 isomounts_file="/usr/share/archiso2dual/isomounts"
 syslinuxcfg_file="/usr/share/archiso2dual/syslinux.cfg"
 removefiles_file="/usr/share/archiso2dual/removefiles.lst"
+compression="auto"
 appname=${0##*/}
 _error="0"
 _confirm="n"
@@ -111,11 +112,16 @@ mksquashfs_image() {
     echo "Executing: ${FUNCNAME}"
     img=${1}
     arch=${2}
+    if [ "${compression}" = "auto" ]; then
+        _compression=$(unsquashfs -s ${work_dir}/iso/${arch}/${img}.sqfs | awk '/^Compression/ { print $2 }')
+    else
+        _compression=${compression}
+    fi
     rm -f ${work_dir}/iso/${arch}/${img}.sqfs
     if [ "${quiet}" = "y" ]; then
-        mksquashfs ${work_dir}/tmp/${arch}/${img} ${work_dir}/iso/${arch}/${img}.sqfs > /dev/null
+        mksquashfs ${work_dir}/tmp/${arch}/${img} ${work_dir}/iso/${arch}/${img}.sqfs -comp ${_compression} > /dev/null
     else
-        mksquashfs ${work_dir}/tmp/${arch}/${img} ${work_dir}/iso/${arch}/${img}.sqfs
+        mksquashfs ${work_dir}/tmp/${arch}/${img} ${work_dir}/iso/${arch}/${img}.sqfs -comp ${_compression}
     fi
 }
 
@@ -239,6 +245,12 @@ show_help()
                      (default to '${publisher}')"
     echo "    -A <application> Set an application name for the disk
                      (default to '${application}')"
+    echo "    -c <compressor>  Set SquashFS compression type: auto, gzip, lzma or lzo
+                     (default to '${compression}')"
+    echo "                     NOTES:"
+    echo "                            lzma: not officially supported yet by Linux (2.6.36)"
+    echo "                            lzo:  needs Linux >= 2.6.36"
+
     echo "    -y               Confirm execution (otherwise only show configuration)"
     echo "    -v               Enable verbose output"
     echo "    -h               This message"
@@ -334,7 +346,7 @@ if [ "$EUID" != "0" ]; then
     exit 1
 fi
 
-while getopts '3:6:o:T:M:S:R:L:P:A:yvh' arg; do
+while getopts '3:6:o:T:M:S:R:L:P:A:c:yvh' arg; do
     case "${arg}" in
         3) isofile_i686="${OPTARG}" ;;
         6) isofile_x86_64="${OPTARG}" ;;
@@ -350,6 +362,7 @@ while getopts '3:6:o:T:M:S:R:L:P:A:yvh' arg; do
         L) label="${OPTARG}" ;;
         P) publisher="${OPTARG}" ;;
         A) application="${OPTARG}" ;;
+        c) compression="${OPTARG}" ;;
         w) work_dir="${OPTARG}" ;;
         y) _confirm="y" ;;
         v) quiet="n"; _v="-v" ;;
-- 
1.7.3.1