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+===== Debian in chroot on Android =====
+<note important>This works with Debian Jessie and does not work with Debian Stretch. APT HTTP method says that it cannot create socket, permission denied. Adding user to the inet/net_raw group does not help. It might be caused by the old 3.4 kernel.</note>
+Automated tool: [[https://guardianproject.info/code/lildebi/|Lil' Debi]].
+  * Uses fixed-size loopback device.
+  * Requires free loopback device - does not work on CyanogenMod 11 on Nexus 4.
+Manual installation:
+  * Install with --foreign on a non-ARM computer
+<code>debootstrap --arch=armhf --foreign jessie armroot/ http://ftp.de.debian.org/debian
+cp /usr/bin/qemu-arm-static armroot/usr/bin/
+chroot armroot/
+/debootstrap/debootstrap --second-stage</code>
+  * Transfer armroot/ to the device /data/armhf
+  * First-time usage after reboot:
+<code>su -c "mount -t tmpfs -o context=u:object_r:fuse:s0 none /storage/emulated/legacy/DCIM/OpenCamera/foo"
+su -c "mount -o bind /dev /data/armhf/dev; mkdir /data/armhf/system; mount -o bind /system /data/armhf/system; mkdir /data/armhf/aroot; mount -o bind / /data/armhf/aroot; export LD_PRELOAD=; export HOME=/root; export TERM=xterm; mount -o bind /mnt/shell/emulated/0/ /data/armhf/storage; chroot /data/armhf /bin/bash"
+</code>
+  * Unexporting LD_PRELOAD from the above example is needed on Android 5 and does not work on Android 6.
+  * Next shell:
+<code>su -c "export LD_PRELOAD=; export HOME=/root; export TERM=xterm; chroot /data/armhf /bin/bash"</code>
+  * Useful .bashrc:
+<code>export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/root/bin"
+cd /root
+/etc/init.d/ssh start >/dev/null  2>&1
+mount | grep -q proc || mount -t proc none /proc
+mount | grep -q devpts || (mount -t devpts none /dev/pts; mount -t sysfs none /sys)
+export LANG=cs_cz.UTF-8
+export LANGUAGE=cs_cz.UTF-8
+[ -e /root/vault/pin ] || encfs /root/.vault /root/vault
+</code>
+  * My favorite terminal emulator: https://f-droid.org/repository/browse/?fdid=jackpal.androidterm