$ git clone -n https://src.fedoraproject.org/rpms/gvisor-tap-vsock.git /var/lib/mock/f45-build-13274-448/root/chroot_tmpdir/scmroot/gvisor-tap-vsock
Cloning into '/var/lib/mock/f45-build-13274-448/root/chroot_tmpdir/scmroot/gvisor-tap-vsock'...
$ git fetch origin 66623d574ab7f26db5cc65bdb101058860b387da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gvisor-tap-vsock
 * [new ref]         66623d574ab7f26db5cc65bdb101058860b387da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66623d5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild