$ git clone -n https://src.fedoraproject.org/rpms/cockpit.git /var/lib/mock/f39-build-1540591-36476/root/chroot_tmpdir/scmroot/cockpit
Cloning into '/var/lib/mock/f39-build-1540591-36476/root/chroot_tmpdir/scmroot/cockpit'...
$ git fetch origin 9878204c24f00f5ddf62f556fea5d253de6e0b4d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit
 * [new ref]         9878204c24f00f5ddf62f556fea5d253de6e0b4d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9878204 [packit] 304 upstream release