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Brydon Gibson
Asked: 2018-02-17 08:32:47 +0800 CST

Chroot onto ARM based image

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I'm trying to do some work on an image for a raspberry pi, but I don't have access to the pi itself, just the SD card that runs the OS.

I'd like to chroot onto the pi's SD card (mainly to run some pip commands), but I'm getting errors with bash :

chroot: failed to run command ‘/bin/bash’: Exec format error

I assume this is because the programs are compiled for the pi's processor and not mine.

The only thought I have is changing the $PATH to point to my /bin, but I can't imagine that being good practice or safe in any way

Is there a way to make this work?

chroot sd-card

1 Answers

  1. It is possible.

    You need to install qemu-user-static on your x86/x86_64 computer:

    sudo apt-get install qemu-user-static

    Let's assume that your rootfs is mounted to /mnt.

    Then try:

    sudo cp /usr/bin/qemu-arm-static /mnt/usr/bin/
sudo cp /etc/resolv.conf /mnt/etc/resolv.conf

cd /mnt
sudo mount --bind /dev dev/
sudo mount --bind /sys sys/
sudo mount --bind /proc proc/
sudo mount --bind /dev/pts dev/pts

sed -i 's/^/#/g' /mnt/raspbian/etc/ld.so.preload
sudo chroot .
sed -i 's/^#//g' /mnt/raspbian/etc/ld.so.preload
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