$ git clone -n https://src.fedoraproject.org/rpms/rust-cpc.git /var/lib/mock/f40-build-2054037-49096/root/chroot_tmpdir/scmroot/rust-cpc
Cloning into '/var/lib/mock/f40-build-2054037-49096/root/chroot_tmpdir/scmroot/rust-cpc'...
$ git fetch origin ae0940be41025f8060cbab25dd06e11113a9777a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cpc
 * [new ref]         ae0940be41025f8060cbab25dd06e11113a9777a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae0940b Update to version 1.9.3; Fixes RHBZ#2239765