$ git clone -n https://src.fedoraproject.org/rpms/rust-derive_builder_macro.git /var/lib/mock/f38-build-side-43-rust-devel-1417172-31459/root/chroot_tmpdir/scmroot/rust-derive_builder_macro
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417172-31459/root/chroot_tmpdir/scmroot/rust-derive_builder_macro'...
$ git fetch origin ebe1ada407af5cd20a0ca6b7e746493a51b91dbf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-derive_builder_macro
 * [new ref]         ebe1ada407af5cd20a0ca6b7e746493a51b91dbf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ebe1ada Update to version 0.12.0; Fixes RHBZ#2064472