$ git clone -n https://src.fedoraproject.org/rpms/perl-DBM-Deep.git /var/lib/mock/f40-build-2239099-53595/root/chroot_tmpdir/scmroot/perl-DBM-Deep
Cloning into '/var/lib/mock/f40-build-2239099-53595/root/chroot_tmpdir/scmroot/perl-DBM-Deep'...
$ git fetch origin 5b9de320796e43932d7ec145fb048b5cdad28b06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DBM-Deep
 * [new ref]         5b9de320796e43932d7ec145fb048b5cdad28b06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b9de32 Update to 2.0019 (rhbz#2249377)