$ git clone -n https://src.fedoraproject.org/rpms/rust-async-channel.git /var/lib/mock/f39-build-2272371-54915/root/chroot_tmpdir/scmroot/rust-async-channel
Cloning into '/var/lib/mock/f39-build-2272371-54915/root/chroot_tmpdir/scmroot/rust-async-channel'...
$ git fetch origin aaf9eb26ae7ab41b1fe5815be5ad81d40b2ed943:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-channel
 * [new ref]         aaf9eb26ae7ab41b1fe5815be5ad81d40b2ed943 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aaf9eb2 Update to version 2.1.1; Fixes RHBZ#2246036