$ git clone -n https://src.fedoraproject.org/rpms/rust-async-executor.git /var/lib/mock/f39-build-1893393-42802/root/chroot_tmpdir/scmroot/rust-async-executor
Cloning into '/var/lib/mock/f39-build-1893393-42802/root/chroot_tmpdir/scmroot/rust-async-executor'...
$ git fetch origin 499ea30603b84a73d29e9b94097e73b0fb2bfdf5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-executor
 * [new ref]         499ea30603b84a73d29e9b94097e73b0fb2bfdf5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 499ea30 Update to version 1.6.0; Fixes RHBZ#2244573