$ git clone -n https://src.fedoraproject.org/rpms/rust-addr2line.git /var/lib/mock/f40-build-2091403-50230/root/chroot_tmpdir/scmroot/rust-addr2line
Cloning into '/var/lib/mock/f40-build-2091403-50230/root/chroot_tmpdir/scmroot/rust-addr2line'...
$ git fetch origin a0ad54ab1d023a0fb583f040c6c2b9fb337c5a3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-addr2line
 * [new ref]         a0ad54ab1d023a0fb583f040c6c2b9fb337c5a3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0ad54a Update to version 0.21.0; Fixes RHBZ#2187037