$ git clone -n https://src.fedoraproject.org/rpms/ffmpegthumbs.git /var/lib/mock/f40-build-2534271-61849/root/chroot_tmpdir/scmroot/ffmpegthumbs
Cloning into '/var/lib/mock/f40-build-2534271-61849/root/chroot_tmpdir/scmroot/ffmpegthumbs'...
$ git fetch origin 18a9ae1e972254b14ade6e7ebb2a3e4016ebe1cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffmpegthumbs
 * [new ref]         18a9ae1e972254b14ade6e7ebb2a3e4016ebe1cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18a9ae1 24.02.0