$ git clone -n https://src.fedoraproject.org/rpms/rust-copydeps.git /var/lib/mock/f38-build-side-43-rust-devel-1410045-31411/root/chroot_tmpdir/scmroot/rust-copydeps
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1410045-31411/root/chroot_tmpdir/scmroot/rust-copydeps'...
$ git fetch origin 407edb742e942a972cce71c3bcf15cca59dff711:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-copydeps
 * [new ref]         407edb742e942a972cce71c3bcf15cca59dff711 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 407edb7 Rebuild for fixed frame pointer compiler flags in Rust RPM macros