$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_expr.git /var/lib/mock/f41-build-810800-146951/root/chroot_tmpdir/scmroot/rust-uu_expr
Cloning into '/var/lib/mock/f41-build-810800-146951/root/chroot_tmpdir/scmroot/rust-uu_expr'...
$ git fetch origin a5b0164a3695cc1d49f66959a16626985df0e4eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_expr
 * [new ref]         a5b0164a3695cc1d49f66959a16626985df0e4eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5b0164 Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces