$ git clone -n https://src.fedoraproject.org/rpms/rust-gio-sys0.15.git /var/lib/mock/f41-build-side-1-2758206-31504/root/chroot_tmpdir/scmroot/rust-gio-sys0.15
Cloning into '/var/lib/mock/f41-build-side-1-2758206-31504/root/chroot_tmpdir/scmroot/rust-gio-sys0.15'...
$ git fetch origin 7bd7cf1719b736ab482fa655bd7dadfdc84bab1a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gio-sys0.15
 * [new ref]         7bd7cf1719b736ab482fa655bd7dadfdc84bab1a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7bd7cf1 compat package no longer needed