$ git clone -n https://src.fedoraproject.org/rpms/ghc-warp.git /var/lib/mock/f39-build-1980481-43341/root/chroot_tmpdir/scmroot/ghc-warp
Cloning into '/var/lib/mock/f39-build-1980481-43341/root/chroot_tmpdir/scmroot/ghc-warp'...
$ git fetch origin eda280fad8d9d1bea6035ede076b5664f1145a20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-warp
 * [new ref]         eda280fad8d9d1bea6035ede076b5664f1145a20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eda280f update to 3.3.25