$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_truncate.git /var/lib/mock/f41-build-810925-146985/root/chroot_tmpdir/scmroot/rust-uu_truncate
Cloning into '/var/lib/mock/f41-build-810925-146985/root/chroot_tmpdir/scmroot/rust-uu_truncate'...
$ git fetch origin 36999f402b465df18a1c90e96f0cb015f64f3ad4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_truncate
 * [new ref]         36999f402b465df18a1c90e96f0cb015f64f3ad4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 36999f4 Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces