$ git clone -n https://src.fedoraproject.org/rpms/rust-futures-channel.git /var/lib/mock/f39-build-2165941-50987/root/chroot_tmpdir/scmroot/rust-futures-channel
Cloning into '/var/lib/mock/f39-build-2165941-50987/root/chroot_tmpdir/scmroot/rust-futures-channel'...
$ git fetch origin b51acd1b72556f0bddad0a710f794325e271df6d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-futures-channel
 * [new ref]         b51acd1b72556f0bddad0a710f794325e271df6d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b51acd1 Update to version 0.3.30; Fixes RHBZ#2246396