$ git clone -n https://src.fedoraproject.org/rpms/rust-cairo-sys-rs0.15.git /var/lib/mock/f41-build-side-1-2769182-32104/root/chroot_tmpdir/scmroot/rust-cairo-sys-rs0.15
Cloning into '/var/lib/mock/f41-build-side-1-2769182-32104/root/chroot_tmpdir/scmroot/rust-cairo-sys-rs0.15'...
$ git fetch origin 2273d1ea22c870df8d7b6c5ec37cf84f0c89d1fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cairo-sys-rs0.15
 * [new ref]         2273d1ea22c870df8d7b6c5ec37cf84f0c89d1fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2273d1e compat package no longer needed