$ git clone -n https://src.fedoraproject.org/rpms/rust-thiserror-impl1.git /var/lib/mock/f45-build-45452-823/root/chroot_tmpdir/scmroot/rust-thiserror-impl1
Cloning into '/var/lib/mock/f45-build-45452-823/root/chroot_tmpdir/scmroot/rust-thiserror-impl1'...
$ git fetch origin ad7d4fc1d588699cd80ee47dc6a1fb70d98c7e1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-thiserror-impl1
 * [new ref]         ad7d4fc1d588699cd80ee47dc6a1fb70d98c7e1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad7d4fc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild