$ git clone -n https://src.fedoraproject.org/rpms/rust-navi.git /var/lib/mock/f38-build-side-43-rust-devel-1410403-31417/root/chroot_tmpdir/scmroot/rust-navi
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1410403-31417/root/chroot_tmpdir/scmroot/rust-navi'...
$ git fetch origin 3e8c795642cf397e03bd8a5b5f1f06cd90ca8280:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-navi
 * [new ref]         3e8c795642cf397e03bd8a5b5f1f06cd90ca8280 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e8c795 Rebuild for fixed frame pointer compiler flags in Rust RPM macros