$ git clone -n https://src.fedoraproject.org/rpms/rust-ouroboros_macro.git /var/lib/mock/f40-build-2101305-50498/root/chroot_tmpdir/scmroot/rust-ouroboros_macro
Cloning into '/var/lib/mock/f40-build-2101305-50498/root/chroot_tmpdir/scmroot/rust-ouroboros_macro'...
$ git fetch origin c984c0c302fbfc37a48b3478476c0454d1d97938:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ouroboros_macro
 * [new ref]         c984c0c302fbfc37a48b3478476c0454d1d97938 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c984c0c Update to 0.17.2, resolves rhbz#2215172