$ git clone -n https://src.fedoraproject.org/rpms/rust-memmem.git /var/lib/mock/f39-build-1561173-37356/root/chroot_tmpdir/scmroot/rust-memmem
Cloning into '/var/lib/mock/f39-build-1561173-37356/root/chroot_tmpdir/scmroot/rust-memmem'...
$ git fetch origin 44723b8ce45f6ae99569970da3a6c6a25baeecfb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-memmem
 * [new ref]         44723b8ce45f6ae99569970da3a6c6a25baeecfb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 44723b8 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild