$ git clone -n https://src.fedoraproject.org/rpms/haxe.git /var/lib/mock/f39-build-1936398-43126/root/chroot_tmpdir/scmroot/haxe
Cloning into '/var/lib/mock/f39-build-1936398-43126/root/chroot_tmpdir/scmroot/haxe'...
$ git fetch origin dfb562e16da3daa58c2f8f326b637cef610946c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/haxe
 * [new ref]         dfb562e16da3daa58c2f8f326b637cef610946c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfb562e commit sources