$ git clone -n https://src.fedoraproject.org/rpms/rust-arrayvec.git /var/lib/mock/f39-build-1516546-35655/root/chroot_tmpdir/scmroot/rust-arrayvec
Cloning into '/var/lib/mock/f39-build-1516546-35655/root/chroot_tmpdir/scmroot/rust-arrayvec'...
$ git fetch origin 6440d0853311b7576464c5876407cc08f707a98a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-arrayvec
 * [new ref]         6440d0853311b7576464c5876407cc08f707a98a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6440d08 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild