$ git clone -n https://src.fedoraproject.org/rpms/rust-proc-macro2-diagnostics.git /var/lib/mock/f45-build-44034-809/root/chroot_tmpdir/scmroot/rust-proc-macro2-diagnostics
Cloning into '/var/lib/mock/f45-build-44034-809/root/chroot_tmpdir/scmroot/rust-proc-macro2-diagnostics'...
$ git fetch origin 4831c685b9510891147e8b2c69282cfdf514d460:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-proc-macro2-diagnostics
 * [new ref]         4831c685b9510891147e8b2c69282cfdf514d460 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4831c68 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild