$ git clone -n https://src.fedoraproject.org/rpms/rust-rustc-demangle.git /var/lib/mock/f45-build-44576-815/root/chroot_tmpdir/scmroot/rust-rustc-demangle
Cloning into '/var/lib/mock/f45-build-44576-815/root/chroot_tmpdir/scmroot/rust-rustc-demangle'...
$ git fetch origin 08550269b3b81b868f41b58a9d95823ffd8647d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustc-demangle
 * [new ref]         08550269b3b81b868f41b58a9d95823ffd8647d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0855026 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild