$ git clone -n https://src.fedoraproject.org/rpms/rust-clang-ast.git /var/lib/mock/f45-build-40798-776/root/chroot_tmpdir/scmroot/rust-clang-ast
Cloning into '/var/lib/mock/f45-build-40798-776/root/chroot_tmpdir/scmroot/rust-clang-ast'...
$ git fetch origin 51d4cf21fc74939ccdc72a0f016994883fef11df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-clang-ast
 * [new ref]         51d4cf21fc74939ccdc72a0f016994883fef11df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51d4cf2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild