$ git clone -n https://src.fedoraproject.org/rpms/perl-ExtUtils-XSpp.git /var/lib/mock/f45-build-23448-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-XSpp
Cloning into '/var/lib/mock/f45-build-23448-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-XSpp'...
$ git fetch origin c40b70d46f6c8c8257be04537bf102e90fd46f14:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-ExtUtils-XSpp
 * [new ref]         c40b70d46f6c8c8257be04537bf102e90fd46f14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c40b70d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild