$ git clone -n https://src.fedoraproject.org/rpms/perl-BDB.git /var/lib/mock/f45-build-21848-588/root/chroot_tmpdir/scmroot/perl-BDB
Cloning into '/var/lib/mock/f45-build-21848-588/root/chroot_tmpdir/scmroot/perl-BDB'...
$ git fetch origin 1c8323583030c7fd95c950b8a3a66a09595158c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-BDB
 * [new ref]         1c8323583030c7fd95c950b8a3a66a09595158c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c83235 Perl 5.44 rebuild