$ git clone -n https://src.fedoraproject.org/rpms/rust-glib-sys0.21.git /var/lib/mock/f45-build-42048-788/root/chroot_tmpdir/scmroot/rust-glib-sys0.21
Cloning into '/var/lib/mock/f45-build-42048-788/root/chroot_tmpdir/scmroot/rust-glib-sys0.21'...
$ git fetch origin 04c0e933a1ab88079f2d4d822a653181728fabb4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glib-sys0.21
 * [new ref]         04c0e933a1ab88079f2d4d822a653181728fabb4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04c0e93 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild