$ git clone -n https://src.fedoraproject.org/rpms/rust-elfcat.git /var/lib/mock/f38-build-side-43-rust-devel-1417283-31459/root/chroot_tmpdir/scmroot/rust-elfcat
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417283-31459/root/chroot_tmpdir/scmroot/rust-elfcat'...
$ git fetch origin ff7ae6ed1967428854e112fdf866ddb9c355672c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-elfcat
 * [new ref]         ff7ae6ed1967428854e112fdf866ddb9c355672c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff7ae6e Rebuild for fixed frame pointer compiler flags in Rust RPM macros