$ git clone -n https://src.fedoraproject.org/rpms/rust-alacritty_config_derive.git /var/lib/mock/f40-build-2639564-66370/root/chroot_tmpdir/scmroot/rust-alacritty_config_derive
Cloning into '/var/lib/mock/f40-build-2639564-66370/root/chroot_tmpdir/scmroot/rust-alacritty_config_derive'...
$ git fetch origin aed58f7781aa6ee2f21047ee26f95455e91a14b0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-alacritty_config_derive
 * [new ref]         aed58f7781aa6ee2f21047ee26f95455e91a14b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aed58f7 Update to 0.2.3 (rhbz#2271309)