$ git clone -n https://src.fedoraproject.org/rpms/pgbouncer.git /var/lib/mock/f39-build-1559137-37317/root/chroot_tmpdir/scmroot/pgbouncer
Cloning into '/var/lib/mock/f39-build-1559137-37317/root/chroot_tmpdir/scmroot/pgbouncer'...
$ git fetch origin 36fd136527dce0b903c7f4874e747364ea3129dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pgbouncer
 * [new ref]         36fd136527dce0b903c7f4874e747364ea3129dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 36fd136 Update to 1.21.0, per changes described at https://www.pgbouncer.org/changelog.html#pgbouncer-121x