$ git clone -n https://src.fedoraproject.org/rpms/libunwind.git /var/lib/mock/f42-build-867661-175703/root/chroot_tmpdir/scmroot/libunwind
Cloning into '/var/lib/mock/f42-build-867661-175703/root/chroot_tmpdir/scmroot/libunwind'...
$ git fetch origin 5723d0220b7460e09dadd9e71e590feb76897c57:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libunwind
 * [new ref]         5723d0220b7460e09dadd9e71e590feb76897c57 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5723d02 Fix test failure in riscv64