$ git clone -n https://src.fedoraproject.org/rpms/perl-ExtUtils-XSBuilder.git /var/lib/mock/f45-build-23442-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-XSBuilder
Cloning into '/var/lib/mock/f45-build-23442-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-XSBuilder'...
$ git fetch origin eb1dad145a4445c30798f9330ec8799f85c91739:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-ExtUtils-XSBuilder
 * [new ref]         eb1dad145a4445c30798f9330ec8799f85c91739 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb1dad1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild