$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-config.git /var/lib/mock/f40-build-2652855-66895/root/chroot_tmpdir/scmroot/rust-gix-config
Cloning into '/var/lib/mock/f40-build-2652855-66895/root/chroot_tmpdir/scmroot/rust-gix-config'...
$ git fetch origin cab3451394ce94f96db5e4a34cfb4d72f5a6e75d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-config
 * [new ref]         cab3451394ce94f96db5e4a34cfb4d72f5a6e75d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cab3451 Update to version 0.31.0