$ git clone -n https://src.fedoraproject.org/rpms/rust-mdbook-driver.git /var/lib/mock/f45-build-43171-800/root/chroot_tmpdir/scmroot/rust-mdbook-driver
Cloning into '/var/lib/mock/f45-build-43171-800/root/chroot_tmpdir/scmroot/rust-mdbook-driver'...
$ git fetch origin 1ecbafa4a726bb4fa20cf469ec2c6254d8f7388d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mdbook-driver
 * [new ref]         1ecbafa4a726bb4fa20cf469ec2c6254d8f7388d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ecbafa Allow shlex version 2