$ git clone -n https://src.fedoraproject.org/rpms/rust-libsystemd.git /var/lib/mock/f42-build-side-1-3539965-46572/root/chroot_tmpdir/scmroot/rust-libsystemd
Cloning into '/var/lib/mock/f42-build-side-1-3539965-46572/root/chroot_tmpdir/scmroot/rust-libsystemd'...
$ git fetch origin 296e6416ef33d20692483348683e2c5d95215f70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libsystemd
 * [new ref]         296e6416ef33d20692483348683e2c5d95215f70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 296e641 Update to version 0.7.1; Fixes RHBZ#2360942