$ git clone -n https://src.fedoraproject.org/rpms/rust-generic-array0.12.git /var/lib/mock/f39-build-1521677-35855/root/chroot_tmpdir/scmroot/rust-generic-array0.12
Cloning into '/var/lib/mock/f39-build-1521677-35855/root/chroot_tmpdir/scmroot/rust-generic-array0.12'...
$ git fetch origin 5554cf6e5b86957e4b65997d91cc21b2177bcc43:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-generic-array0.12
 * [new ref]         5554cf6e5b86957e4b65997d91cc21b2177bcc43 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5554cf6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild