$ git clone -n https://src.fedoraproject.org/rpms/perl-URI-cpan.git /var/lib/mock/f45-build-27329-622/root/chroot_tmpdir/scmroot/perl-URI-cpan
Cloning into '/var/lib/mock/f45-build-27329-622/root/chroot_tmpdir/scmroot/perl-URI-cpan'...
$ git fetch origin f53191c5c3de0dde654400f24b24f81a90a16acf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-URI-cpan
 * [new ref]         f53191c5c3de0dde654400f24b24f81a90a16acf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f53191c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild