$ git clone -n https://src.fedoraproject.org/rpms/perl-X10.git /var/lib/mock/f45-build-27425-624/root/chroot_tmpdir/scmroot/perl-X10
Cloning into '/var/lib/mock/f45-build-27425-624/root/chroot_tmpdir/scmroot/perl-X10'...
$ git fetch origin 9a1befa6bf06b6bc447e9ac97b7a3daea234c225:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-X10
 * [new ref]         9a1befa6bf06b6bc447e9ac97b7a3daea234c225 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a1befa Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild