building a binary debian kernel module package with dkms

DKMS packaging works great for building out of tree kernel modules. However, what do you do when you need to install to a machine without a compiler? You can accompish this by using DKMS's mkdriverdisk functionality.

First follow the steps in [0] for setting up a proper DKMS package.

After you've built the module successfully, you can use the following bash script to extract the .deb installer from the driverdisk. This way you can copy the deb file to the target machine and install. You must ensure that $(uname -rm) on the target machine matches the build machine.

The Script

NAME=hello
VERSION=0.1

# Build in a temp dir
TMPDIR=$(mktemp -d)
cd $TMPDIR
sudo dkms mkdriverdisk $NAME/$VERSION -d ubuntu --media tar | tee build.log
TARBALL_PATH=$(grep "Disk image location" build.log | cut -d':' -f2)
echo $TARBALL_PATH
tar -xf $TARBALL_PATH
cd -

# Extract the build
mv $TMPDIR/ubuntu-drivers/*/*.deb .

References

1. https://wiki.ubuntu.com/Kernel/Dev/DKMSPackaging