$ git clone -n https://src.fedoraproject.org/rpms/perl-Fsdb.git /var/lib/mock/f45-build-23661-598/root/chroot_tmpdir/scmroot/perl-Fsdb
Cloning into '/var/lib/mock/f45-build-23661-598/root/chroot_tmpdir/scmroot/perl-Fsdb'...
$ git fetch origin 5a6c1833ab09180b9b9f4768a776cfa7acce994d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Fsdb
 * [new ref]         5a6c1833ab09180b9b9f4768a776cfa7acce994d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a6c183 new release