While modern Linux kernels still support it, the userspace tools
haven't been updated in over a decade. Also, squashfs provides
both better performance, and better compression ratio:

https://elinux.org/Squash_Fs_Comparisons

Signed-off-by: Alexander Kanavin <alexander.kana...@linux.intel.com>
---
 meta/classes/image-live.bbclass                      | 17 ++---------------
 meta/conf/distro/include/maintainers.inc             |  1 -
 .../zisofs-tools/zisofs-tools-native_1.0.8.bb        | 20 --------------------
 3 files changed, 2 insertions(+), 36 deletions(-)
 delete mode 100644 
meta/recipes-devtools/zisofs-tools/zisofs-tools-native_1.0.8.bb

diff --git a/meta/classes/image-live.bbclass b/meta/classes/image-live.bbclass
index 1623c15988b..966277c6785 100644
--- a/meta/classes/image-live.bbclass
+++ b/meta/classes/image-live.bbclass
@@ -19,7 +19,6 @@
 
 # External variables (also used by syslinux.bbclass)
 # ${INITRD} - indicates a list of filesystem images to concatenate and use as 
an initrd (optional)
-# ${COMPRESSISO} - Transparent compress ISO, reduce size ~40% if set to 1
 # ${NOISO}  - skip building the ISO image if set to 1
 # ${NOHDD}  - skip building the HDD image if set to 1
 # ${HDDIMG_ID} - FAT image volume-id
@@ -33,7 +32,6 @@ do_bootimg[depends] += "dosfstools-native:do_populate_sysroot 
\
                         virtual/kernel:do_deploy \
                         ${MLPREFIX}syslinux:do_populate_sysroot \
                         syslinux-native:do_populate_sysroot \
-                        ${@oe.utils.ifelse(d.getVar('COMPRESSISO', 
False),'zisofs-tools-native:do_populate_sysroot','')} \
                         
${PN}:do_image_${@d.getVar('LIVE_ROOTFS_TYPE').replace('-', '_')} \
                         "
 
@@ -65,7 +63,6 @@ HDDDIR = "${S}/hddimg"
 ISODIR = "${S}/iso"
 EFIIMGDIR = "${S}/efi_img"
 COMPACT_ISODIR = "${S}/iso.z"
-COMPRESSISO ?= "0"
 
 ISOLINUXDIR ?= "/isolinux"
 ISO_BOOTIMG = "isolinux/isolinux.bin"
@@ -115,18 +112,8 @@ build_iso() {
                install -m 0644 ${STAGING_DATADIR}/syslinux/isolinux.bin 
${ISODIR}${ISOLINUXDIR}
        fi
 
-       if [ "${COMPRESSISO}" = "1" ] ; then
-               # create compact directory, compress iso
-               mkdir -p ${COMPACT_ISODIR}
-               mkzftree -z 9 -p 4 -F ${ISODIR}/rootfs.img 
${COMPACT_ISODIR}/rootfs.img
-
-               # move compact iso to iso, then remove compact directory
-               mv ${COMPACT_ISODIR}/rootfs.img ${ISODIR}/rootfs.img
-               rm -Rf ${COMPACT_ISODIR}
-               mkisofs_compress_opts="-R -z -D -l"
-       else
-               mkisofs_compress_opts="-r"
-       fi
+       # We used to have support for zisofs; this is a relic of that
+       mkisofs_compress_opts="-r"
 
        # Check the size of ${ISODIR}/rootfs.img, use mkisofs -iso-level 3
        # when it exceeds 3.8GB, the specification is 4G - 1 bytes, we need
diff --git a/meta/conf/distro/include/maintainers.inc 
b/meta/conf/distro/include/maintainers.inc
index 16a15a3865e..24bf6b96a7e 100644
--- a/meta/conf/distro/include/maintainers.inc
+++ b/meta/conf/distro/include/maintainers.inc
@@ -803,5 +803,4 @@ RECIPE_MAINTAINER_pn-xwininfo = "Armin Kuster 
<akus...@mvista.com>"
 RECIPE_MAINTAINER_pn-xz = "Denys Dmytriyenko <de...@ti.com>"
 RECIPE_MAINTAINER_pn-yasm = "Yi Zhao <yi.z...@windriver.com>"
 RECIPE_MAINTAINER_pn-zip = "Denys Dmytriyenko <de...@ti.com>"
-RECIPE_MAINTAINER_pn-zisofs-tools-native = "Alexander Kanavin 
<alexander.kana...@intel.com>"
 RECIPE_MAINTAINER_pn-zlib = "Denys Dmytriyenko <de...@ti.com>"
diff --git a/meta/recipes-devtools/zisofs-tools/zisofs-tools-native_1.0.8.bb 
b/meta/recipes-devtools/zisofs-tools/zisofs-tools-native_1.0.8.bb
deleted file mode 100644
index 021c05839c0..00000000000
--- a/meta/recipes-devtools/zisofs-tools/zisofs-tools-native_1.0.8.bb
+++ /dev/null
@@ -1,20 +0,0 @@
-# zisofs-tools-native OE build file
-# Copyright (C) 1989, 1991 Free Software Foundation, Inc.
-SUMMARY = "Utilities for creating compressed CD-ROM filesystems"
-HOMEPAGE = "http://freecode.com/projects/zisofs-tools";
-SECTION = "console/utils"
-LICENSE = "GPLv2"
-LIC_FILES_CHKSUM = "file://COPYING;md5=94d55d512a9ba36caa9b7df079bae19f"
-
-DEPENDS = "zlib-native"
-
-SRC_URI = 
"http://pkgs.fedoraproject.org/repo/pkgs/zisofs-tools/zisofs-tools-${PV}.tar.bz2/2d0ed8c9a1f60b45f949b136f9be1f6c/zisofs-tools-${PV}.tar.bz2";
-
-SRC_URI[md5sum] = "2d0ed8c9a1f60b45f949b136f9be1f6c"
-SRC_URI[sha256sum] = 
"ae4e53e4914934d41660248fb59d3c8761f1f1fd180d5ec993c17ddb3afd04f3"
-
-inherit native
-
-do_install() {
-       oe_runmake install INSTALLROOT=${D} bindir=${bindir}
-}
-- 
2.15.1

-- 
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