$ git clone -n https://src.fedoraproject.org/rpms/rust-idea.git /var/lib/mock/f45-build-42503-794/root/chroot_tmpdir/scmroot/rust-idea
Cloning into '/var/lib/mock/f45-build-42503-794/root/chroot_tmpdir/scmroot/rust-idea'...
$ git fetch origin 31e5965d4637a3199e27483dea135a12d37bc0a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-idea
 * [new ref]         31e5965d4637a3199e27483dea135a12d37bc0a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31e5965 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild