$ git clone -n https://src.fedoraproject.org/rpms/perl-DB_File.git /var/lib/mock/f45-build-22814-594/root/chroot_tmpdir/scmroot/perl-DB_File
Cloning into '/var/lib/mock/f45-build-22814-594/root/chroot_tmpdir/scmroot/perl-DB_File'...
$ git fetch origin 5195f0dc95d52eb26264e5ec6a71b9b567d6f114:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DB_File
 * [new ref]         5195f0dc95d52eb26264e5ec6a71b9b567d6f114 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5195f0d Perl 5.44 re-rebuild of bootstrapped packages