$ git clone -n https://src.fedoraproject.org/rpms/rust-peg.git /var/lib/mock/f45-build-43769-805/root/chroot_tmpdir/scmroot/rust-peg
Cloning into '/var/lib/mock/f45-build-43769-805/root/chroot_tmpdir/scmroot/rust-peg'...
$ git fetch origin ab444a87c3306bc79d5047b642d3e7483d04059e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-peg
 * [new ref]         ab444a87c3306bc79d5047b642d3e7483d04059e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab444a8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild