![]() ![]() You can either bind-mount the binary into the chroot, or just copy it. If you are using stretch or earlier, make the emulator available for the target architecture inside the chroot at the path registered by binfmt-support. This means that you can use the dynamically linked qemu on buster or later but not stretch or earlier because the host libraries will not be accessible from inside the chroot. From Debian buster and later, this isn't necessary because Linux will use the qemu binary from the host system instead of from the chroot. If you are using stretch or earlier, it also needs to be accessible from inside the chroot jail. ![]() You need first to install the qemu-user-static package: To be able to chroot into a target file system, the qemu emulator for the target CPU needs to be available. That's it! You can now run non-native executables transparently, as long as QEMU supports the system calls used by it.Īppendix: chrooting into target file systems $ dpkg -x hello_version_b /tmp/hello_armelįinally, run the hello executable with: $ /tmp/hello_armel/usr/bin/hello We will use the "hello" ARM Debian package to test the new environment. If using dpkg-cross it's installed in a non-standard path so you need to tell QEMU about that.įor example, for the armel architecture: add the lineįor armhf add: EXTRA_OPTS="-L /usr/arm-linux-gnueabihf" ![]() Under multiarch the target arch loader is in the usual place (/lib/) so nothing special is needed. Now download the target libc6 package from one of the Debian mirrors and install it using dpkg-cross:.If the target Debian package cannot be installed directly on the host, we need to use dpkg-cross to "cross-install" the package.įor example purposes, let's assume the target system is "armel". Installing the target C libraries with dpkg-cross Installing the target C libraries with multiarchįor example purposes, let's assume the target system is "armhf". Installing this can be done with multiarch from wheezy onwards, or with dpkg-cross on earlier (pre-multiarch) releases. The libc6 package for the target architecture contains the target's ELF interpreter used by QEMU. To be able to run dynamically linked binaries, QEMU needs to have access to the target ELF interpreter. With the instructions above, you should be able to run statically linked target executables. This command should print entries for each supported target user emulator, except for the host system.ĭepending on the your kernel settings, you may need to set 'vm.mmap_min_addr=0' sysctl option to allow a program being run under a regular user, not root.Check whether the binfmt entries were successfully registered:.# apt install binfmt-support qemu-user-static Install qemu, binfmt-support, and qemu-user-static:.The binfmt-support package contains a helper script to easily register/unregister binary formats with the kernel using the binfmt_misc module. Note this setup is incompatible with Scratchbox (both use the binfmt_misc module to register the same formats), so it's recommended to remove it (or stop its init script) before continuing. In this text, "target" means the system being emulated, and "host" means the system where QEMU is running. This page describes how to setup and use QEMU user emulation in a "transparent" fashion, allowing execution of non-native target executables just like native ones (i.e./program). ![]()
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