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by jimmies 3063 days ago
Good observation :) it's the raspbian arm build -- you are chroot-ing into the exact SD card that you put into the Pi.

I don't know how exactly this sorcery works either. But I think chroot just "knows" that it needs to invoke qemu when it sees the binfmt of /bin/bash being arm.
1 comments
hibby 3063 days ago
If you read the script, it copies the relevant qemu binary on line 52 to the chroot's /usr/bin/.

What's happening here is binfmt-support on the host has a path registered for arm binaries as the file you just copied to /usr/bin - whenever the chroot tries to run anything, the host directs it to this bianry which is your arm emulator :).

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jimmies 3063 days ago
That's an awesome explanation - thanks! I just copied and pasted from other people's code and prettified it a bit so it's easier to use, but I didn't really understand why it worked. Now I do a bit better.
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