$ git clone -n https://src.fedoraproject.org/rpms/rust-atk-sys0.15.git /var/lib/mock/f41-build-side-1-2803291-32817/root/chroot_tmpdir/scmroot/rust-atk-sys0.15
Cloning into '/var/lib/mock/f41-build-side-1-2803291-32817/root/chroot_tmpdir/scmroot/rust-atk-sys0.15'...
$ git fetch origin 39ba27e3dfd2c7ccd55d2ce82442ad71045ca23d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-atk-sys0.15
 * [new ref]         39ba27e3dfd2c7ccd55d2ce82442ad71045ca23d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39ba27e compat package no longer needed