$ git clone -n https://src.fedoraproject.org/rpms/ffmpegthumbs.git /var/lib/mock/f42-build-863480-171710/root/chroot_tmpdir/scmroot/ffmpegthumbs
Cloning into '/var/lib/mock/f42-build-863480-171710/root/chroot_tmpdir/scmroot/ffmpegthumbs'...
$ git fetch origin 8e055aa0265da0714548d521040a580f521f6ee3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffmpegthumbs
 * [new ref]         8e055aa0265da0714548d521040a580f521f6ee3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e055aa 24.12.0