$ git clone -n https://src.fedoraproject.org/rpms/rust-peg-runtime.git /var/lib/mock/f45-build-43768-805/root/chroot_tmpdir/scmroot/rust-peg-runtime
Cloning into '/var/lib/mock/f45-build-43768-805/root/chroot_tmpdir/scmroot/rust-peg-runtime'...
$ git fetch origin 63bdbc2de82f5f6b7c039e430d4afaa43034e0f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-peg-runtime
 * [new ref]         63bdbc2de82f5f6b7c039e430d4afaa43034e0f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63bdbc2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild