$ git clone -n https://src.fedoraproject.org/rpms/rust-jpeg-decoder.git /var/lib/mock/f40-build-2657043-66915/root/chroot_tmpdir/scmroot/rust-jpeg-decoder
Cloning into '/var/lib/mock/f40-build-2657043-66915/root/chroot_tmpdir/scmroot/rust-jpeg-decoder'...
$ git fetch origin 6b22f71882058f1657f710bd5b0e9072f8ae5b06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-jpeg-decoder
 * [new ref]         6b22f71882058f1657f710bd5b0e9072f8ae5b06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b22f71 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild