From f2339566b4ba8870833e0f3229190624c9205fb8 Mon Sep 17 00:00:00 2001
From: Cyteen <cyteen@ring-zero.co.uk>
Date: Wed, 15 Nov 2017 18:28:16 +0000
Subject: [PATCH] A utility script to extract the root filesystem from an
 sdcard image for use in mobile phone chroots.

---
 extract_chroot_image.sh | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 extract_chroot_image.sh

diff --git a/extract_chroot_image.sh b/extract_chroot_image.sh
new file mode 100644
index 0000000..71e38f6
--- /dev/null
+++ b/extract_chroot_image.sh
@@ -0,0 +1,33 @@
+# Extract an image from devuan released images for use in mobile phone chroots.
+
+# Fetch the image, for Samsung S4 we need a armhf image.
+#https://files.devuan.org/devuan_jessie/embedded/devuan_jessie_1.0.0_armhf_sunxi.img.xz
+#https://files.devuan.org/devuan_jessie/embedded/devuan_jessie_1.0.0_armhf_raspi2.img.xz
+#https://files.devuan.org/devuan_jessie/embedded/devuan_jessie_1.0.0_armhf_odroidxu.img.xz
+#https://files.devuan.org/devuan_jessie/embedded/devuan_jessie_1.0.0_armhf_n900.img.xz
+#https://files.devuan.org/devuan_jessie/embedded/devuan_jessie_1.0.0_armhf_chromeveyron.img.xz
+#https://files.devuan.org/devuan_jessie/embedded/devuan_jessie_1.0.0_armhf_chromeacer.img.xz
+
+FILE_URL=https://files.devuan.org/devuan_jessie/embedded
+XZIMAGE=$1|devuan_jessie_1.0.0_armhf_sunxi.img.xz
+IMAGE=${XZIMAGE%\.*}
+
+wget -c ${FILE_URL}/${XZIMAGE}
+
+# uncompress
+unxz ${XZIMAGE}
+
+# Mount the partitions
+apt-get install -y kpartx
+
+ kpartx -a -v ${IMAGE}
+
+TMP_MNT=/tmp/kpartx-mnt
+mkdir -p ${TMP_MNT}
+
+mount /dev/mapper/loop0p2 ${TMP_MNT}
+
+tar czvf linux-rootfs.tar.gz -C ${TMP_MNT} .
+
+umount ${TMP_MNT}
+rm ${IMAGE}