$ git clone -n https://src.fedoraproject.org/rpms/celestia.git /var/lib/mock/f39-build-1961433-43268/root/chroot_tmpdir/scmroot/celestia
Cloning into '/var/lib/mock/f39-build-1961433-43268/root/chroot_tmpdir/scmroot/celestia'...
$ git fetch origin a3b4b63c9df22008e0b6f0884692ecea4d7a882e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/celestia
 * [new ref]         a3b4b63c9df22008e0b6f0884692ecea4d7a882e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3b4b63 Merge branch 'rawhide' into f39