$ git clone -n https://src.fedoraproject.org/rpms/rust-gettid.git /var/lib/mock/f45-build-41868-786/root/chroot_tmpdir/scmroot/rust-gettid
Cloning into '/var/lib/mock/f45-build-41868-786/root/chroot_tmpdir/scmroot/rust-gettid'...
$ git fetch origin 42e7544a03506712845aead2a7d66b4a3c90ee6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gettid
 * [new ref]         42e7544a03506712845aead2a7d66b4a3c90ee6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42e7544 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild