$ git clone -n https://src.fedoraproject.org/rpms/rust-async-executor.git /var/lib/mock/f39-build-1499465-34744/root/chroot_tmpdir/scmroot/rust-async-executor
Cloning into '/var/lib/mock/f39-build-1499465-34744/root/chroot_tmpdir/scmroot/rust-async-executor'...
$ git fetch origin 9c099ee759bcc9d14f7d69acdff5257ffbc9621e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-executor
 * [new ref]         9c099ee759bcc9d14f7d69acdff5257ffbc9621e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9c099ee Update to version 1.5.4; Fixes RHBZ#2241095