$ git clone -n https://src.fedoraproject.org/rpms/rust-string_cache0.8.git /var/lib/mock/f45-build-45215-821/root/chroot_tmpdir/scmroot/rust-string_cache0.8
Cloning into '/var/lib/mock/f45-build-45215-821/root/chroot_tmpdir/scmroot/rust-string_cache0.8'...
$ git fetch origin 825574792c66f0f29c21e3645e64dc398631f2d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-string_cache0.8
 * [new ref]         825574792c66f0f29c21e3645e64dc398631f2d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8255747 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild