$ git clone -n https://src.fedoraproject.org/rpms/rust-pixman-sys.git /var/lib/mock/f45-build-43877-807/root/chroot_tmpdir/scmroot/rust-pixman-sys
Cloning into '/var/lib/mock/f45-build-43877-807/root/chroot_tmpdir/scmroot/rust-pixman-sys'...
$ git fetch origin 955b5bc054edbb4cb1b8ab2f9aa8bb36cd5dc5a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pixman-sys
 * [new ref]         955b5bc054edbb4cb1b8ab2f9aa8bb36cd5dc5a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 955b5bc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild