.

Author: zaoqi

.gitignore

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+*~

README.md

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+# Install
+
+* [jailbreak](https://www.mobileread.com/forums/forumdisplay.php?f=150) and install [KUAL](https://www.mobileread.com/forums/showthread.php?t=203326)
+* copy this directory to `extensions`.

lib.sh

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+
+echo "
+    chroot for modern Kindle
+    Copyright (C) 2019  zaoqi
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"
+
+cd "$(dirname "$0")"
+
+fail(){
+    echo "Failed. $*"
+    echo "press enter to countinue."
+    read
+    exit 1
+}
+
+BIN="$(pwd)"
+ROOTFS_DIR="$(pwd)/rootfs"
+ROOTFS_IMG="$(pwd)/rootfs.img"
+ROOTFS_TYPE=ext3
+ROOTFS_LOCK="/tmp/kUaL_lInUx_mOuNtEd"
+INNER_TMP="/tmp/kUaL_lInUx"
+mkdir -p tmp.testext4
+cp rootfs.ext4.base tmp.testext4.img || fail
+if mount -o loop tmp.testext4.img tmp.testext4; then
+    echo This kernel support ext4.
+    ROOTFS_TYPE=ext4
+else
+    mkdir -p tmp.testext3
+    cp rootfs.ext3.base tmp.testext3.img || fail
+    mount -o loop tmp.testext3.img tmp.testext3 || fail "This kernel doesn't support ext4 and ext3."
+    echo This kernel support ext3.
+    ROOTFS_TYPE=ext3
+fi
+umount tmp.testext4
+umount tmp.testext3
+rm -fr tmp.*
+
+get_rootfs_tgz_filename(){
+    curl http://dl-cdn.alpinelinux.org/alpine/edge/releases/armhf/ |
+	grep '^<a.*"alpine-minirootfs-[0-9]*-armhf\.tar\.gz"' |
+	sed 's|^<a *href="\(.*\)">.*</a>.*$|\1|' |
+	sort |
+	tail -1
+}
+get_rootfs_tgz_url(){
+    echo "http://dl-cdn.alpinelinux.org/alpine/edge/releases/armhf/$(get_rootfs_filename)"
+}
+
+mount_rootfs_base(){
+    [ -f "$ROOTFS_LOCK" ] && fail "rootfs mounted."
+    touch "$ROOTFS_LOCK" || fail
+    mkdir -p "$ROOTFS_DIR" || fail
+    mount -o loop "$ROOTFS_IMG" "$ROOTFS_DIR" || fail "cannot mount rootfs."
+}
+
+umount_rootfs_all(){
+    [ -f "$ROOTFS_LOCK" ] || fail "rootfs is not mounted."
+    for d in /dev /dev/pts /proc /sys /tmp; do
+	umount "$ROOTFS_DIR/$d"
+    done
+    umount "$ROOTFS_DIR" || fail "cannot unmount rootfs."
+    rm "$ROOTFS_LOCK" || fail
+}
+
+install_rootfs(){
+    [ -f "$ROOTFS_LOCK" ] && fail "rootfs mounted."
+    rm -fr "$ROOTFS_IMG" || fail
+    mount_rootfs_base
+    curl "$(get_rootfs_tgz_url)" | tar -xvz -C "$ROOTFS_DIR" || fail "download and extract rootfs: failed."
+    umount_rootfs_all
+}
+
+mount_rootfs_all(){
+    mount_rootfs_base
+    mkdir -p "$INNER_TMP" || fail
+    mount -o bind "$INNER_TMP" "$ROOTFS_DIR/tmp" || fail "cannot bind /tmp."
+    for d in /dev /dev/pts /proc /sys; do
+	mount -o bind "/$d" "$ROOTFS_DIR/$d" || fail "cannot bind $d"
+    done
+}
+
+do_chroot(){
+    [ -f "$ROOTFS_LOCK" ] || fail "rootfs is not mounted."
+    HOME=/root chroot "$ROOTFS_DIR" "$@"
+}

rootfs.ext3.base

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+On normal GNU/Linux:
+
+```
+dd if=/dev/zero of=rootfs.ext3.base bs=10M count=1
+mkfs.ext3 rootfs.ext3.base
+resize2fs rootfs.ext3.base 1248
+tune2fs -i 0 -c 0 rootfs.ext3.base
+```
+
+```
+dd if=/dev/zero of=rootfs.ext4.base bs=10M count=1
+mkfs.ext4 rootfs.ext4.base
+resize2fs rootfs.ext4.base 1539
+tune2fs -i 0 -c 0 rootfs.ext4.base
+```