$ git clone -n https://src.fedoraproject.org/rpms/xmlsec1.git /var/lib/mock/f45-build-38963-730/root/chroot_tmpdir/scmroot/xmlsec1
Cloning into '/var/lib/mock/f45-build-38963-730/root/chroot_tmpdir/scmroot/xmlsec1'...
$ git fetch origin 1f72e780ec85a585de8f6e1996cd007bea130582:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmlsec1
 * [new ref]         1f72e780ec85a585de8f6e1996cd007bea130582 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f72e78 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild