You can use the jalien cache manager for this which is the tool which downloads files to Hyperloop. To get this up on your local box, you need a few steps:

• Install xjalienfs with aliBuild:

aliBuild install xjalienfs

• Checkout the cache manager from git:

git clone ssh://git@gitlab.cern.ch:7999/jalien/jalien-cache-manager.git

• Add the target directory jalien-cache-manager to your path or give the absolute path below.
• Install python dependencies:

pip install click humanfriendly cachier

• Create a directory for the files:

export CACHE_DIR=$HOME/jalien-cache
mkdir $CACHE_DIR

• Enter the environment:

alienv enter xjalienfs/latest-release,ROOT/latest

The download itself happens with the following command:

jcachemgr --cache-dir $CACHE_DIR pull --out wn.xml --parallel=8 --limit=50 /alice/data/2021/OCT/505637/apass1/AOD AO2D.root

which would download at maximum 50 files of type AO2D.root from /alice/data/2021/OCT/505637/apass1/AOD

When the command terminates it creates a wn.xml which contains the list of files. This is the input to a Grid job. If you want to get a text file list from this to use as input for O2, the following line does it for you:

sed -rn 's/.*turl="([^"]*)".*/\1/p' wn.xml > input.txt

If you need a single input files from a conversion train, please take them from the train test, by:

• Going to the train Run3_Conversion
• Click on the train number of the train you are interested in then open the test results by clicking the + button

• Scroll to "full train" and click on "output"

• Download the AO2D.root

• You can also click on processing progress and then follow the output directories to download a larger AO2D.root (Note that those are in the folder AOD). All this is only suitable for manual downloading of a few files. For everything else see the previous item.