$ git clone -n https://src.fedoraproject.org/rpms/rust-glib-macros0.19.git /var/lib/mock/f42-build-side-1-3540384-46574/root/chroot_tmpdir/scmroot/rust-glib-macros0.19
Cloning into '/var/lib/mock/f42-build-side-1-3540384-46574/root/chroot_tmpdir/scmroot/rust-glib-macros0.19'...
$ git fetch origin b9bc400e9334a0c7b456f46dc23cf763e21db4b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glib-macros0.19
 * [new ref]         b9bc400e9334a0c7b456f46dc23cf763e21db4b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9bc400 compat package no longer needed