$ git clone -n https://src.fedoraproject.org/rpms/perl-Type-Tiny-XS.git /var/lib/mock/f45-build-27284-622/root/chroot_tmpdir/scmroot/perl-Type-Tiny-XS
Cloning into '/var/lib/mock/f45-build-27284-622/root/chroot_tmpdir/scmroot/perl-Type-Tiny-XS'...
$ git fetch origin ac453f56690d30aa48be5de61a321ab812623ed3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Type-Tiny-XS
 * [new ref]         ac453f56690d30aa48be5de61a321ab812623ed3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac453f5 Perl 5.44 rebuild