Merge branch 'space-savings' into 'master'

save image space by using more intelligent compression

Closes #247

See merge request systemrescue/systemrescue-sources!164

airootfs/root/customize_airootfs.sh

@@ -64,6 +64,10 @@ rm -rf /usr/share/gir*
 rm -rf /usr/include
 rm -rf /usr/share/man/man3
 
+# save some more space by removing large & unnecessary files
+rm -f /lib/modules/*/vmlinuz
+rm -f /usr/share/grub/themes/starfield/starfield.png
+
 # Cleanup XFCE menu
 sed -i '2 i NoDisplay=true' /usr/share/applications/{xfce4-mail-reader,xfce4-web-browser}.desktop
 sed -i "s/^\(Categories=\).*\$/Categories=Utility;/" /usr/share/applications/{geany,*ristretto*,*GHex*}.desktop

build.sh

@@ -225,10 +225,9 @@ make_customize_airootfs() {
     find ${work_dir}/${arch}/airootfs/usr/lib -type f -name "lib*.so.*" -exec strip --strip-all {} \;
 
     # recompress kernel modules to save space (#247)
-    echo "Recompressing kernel modules ..."
+    echo "Uncompressing kernel modules ..."
     kernelver=$(basename ${work_dir}/${arch}/airootfs/usr/lib/modules/*)
     find ${work_dir}/${arch}/airootfs/usr/lib/modules/${kernelver} -type f -name "*.ko.zst" -exec zstd -q -d --rm {} \;
-    find ${work_dir}/${arch}/airootfs/usr/lib/modules/${kernelver} -type f -name "*.ko" -exec xz {} \;
     depmod --all --basedir=${work_dir}/${arch}/airootfs/usr ${kernelver}
 }
 

mkinitcpio.conf

@@ -2,3 +2,4 @@ MODULES=(fuse)
 BINARIES=(aq jq mount.ntfs)
 HOOKS=(base udev memdisk findroot archiso archiso_loop_mnt archiso_pxe_common archiso_pxe_nbd archiso_pxe_http archiso_pxe_nfs archiso_kms block mdadm_udev modconf encrypt lvm2 filesystems keyboard)
 COMPRESSION="xz"
+COMPRESSION_OPTIONS="--threads=0 --lzma2=preset=9e,dict=128MiB --verbose"