$ git clone -n https://src.fedoraproject.org/rpms/rust-coreos-installer.git /var/lib/mock/f40-build-2657498-66916/root/chroot_tmpdir/scmroot/rust-coreos-installer
Cloning into '/var/lib/mock/f40-build-2657498-66916/root/chroot_tmpdir/scmroot/rust-coreos-installer'...
$ git fetch origin a340d2fcd9be0a3a5a476bb2543993cfe49bf928:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-coreos-installer
 * [new ref]         a340d2fcd9be0a3a5a476bb2543993cfe49bf928 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a340d2f [packit] 0.21.0 upstream release