Trovi sharing portal

Chameleon Trovi is a sharing portal that allows you to share digital research and education artifacts, such as packaged experiments, workshop tutorials, or class materials. Each research artifact is represented as a deposition (a remotely accessible folder) where a user can put Jupyter notebooks, links to images, orchestration templates, data, software, and other digital representations that together represent a focused contribution that can be run on Chameleon. Users can use these artifacts to recreate and rerun experiments or class exercises on a Jupyter Notebook within Chameleon. They can also create their own artifacts and publish them directly to Trovi from within Chameleon’s Jupyter server.

To get started, find the “Trovi” dropdown option under the “Experiment” section of Once you’re on the Trovi homepage, you’ll see a list of publicly available experiments and other digital artifacts. You can now browse those artifacts or upload your own.

Location of Trovi in the UI.

The “Trovi” option under the “Experiment” section takes you to Trovi.

Browsing artifacts

Trovi allows you to browse artifacts, presented in a scrolling list format. On the right hand side, there are multiple filtering options. By clicking on the project name, you can see all the artifacts that belong to that project. The “All” choice shows you all of the artifacts you have access to. You can also see how many times people have downloaded and launched your notebook with the icons in the bottom left corner of an artifact.

Launching an artifact

The most powerful feature available via Trovi is the ability to re-launch the available artifacts within Chameleon. Clicking “Launch with JupyterHub” will open a new Jupyter Notebook server with the artifacts downloaded (we support artifacts up to 500MB in total size, please contact the Help Desk if you need more space). The animation below shows how easy it is:

Animation of clicking launch button.

Clicking the “Launch with JupyterHub” button to import a Trovi artifact into your own Jupyter server.

Packaging shared artifacts

You can publish new artifacts to Trovi either from your primary Jupyter server or by editing a previously-shared artifact. In the latter case, you are effectively creating a new “forked” artifact owned by you.

When you’ve finished creating or making changes to an experiment, in the Jupyter interface, select the directory (not a single file) you wish to package. Then, click on the “Share” tab and select “Package as a new artifact”. Your artifact is now packaged and uploaded to Chameleon file storage, and you’ll be prompted to fill out descriptions about the artifact. Don’t worry if you want to change this later—you will be able to edit them on the Trovi portal or within Jupyter.

Congratulations! Your artifact is now uploaded to Trovi—but to make it accessible to others you need to adjust its sharing settings.

Animation of packaging a new artifact from Jupyter.

Saving new versions

If you make changes to your artifact, you can submit an updated version. Within Jupyter, you navigate to the “Sharing” tab, but this time you click “Create new artifact version”. The different versions are viewable on the Trovi portal after clicking on the artifact.

Animation of uploading a new artifact version from Jupyter.

Editing artifacts

You can edit an artifact’s metadata, including its title, description, and list of authors at any time via the Jupyter interface.

Animation of editing an artifact's metadata.

This edit view is also available from Trovi via the “Edit” button.

Adjusting sharing settings

When you first upload your packaged artifact to Trovi, its visibility is set as private, meaning only you can see or launch it. There are multiple options to change the visibility of the artifact, and you have the option to decide how visible you want it to be.

  1. Share via private link: this option allows you to share the experiment to select people, like individual colleagues, advisors, or students. Anybody in possession of the link can view and launch any version of the artifact.
  2. Share with projects: this option allows you to share the experiment with members of a Chameleon Project. You can also share amongst multiple projects.
  3. Publish with DOI: this option allows you to publish a version of your artifact to Zenodo.

To make your artifact shareable follow the actions shown in the animation below: first select how your want to share and then your sharing destination.

Publishing to Zenodo

Trovi is intended for sharing work in progress with a limited group of “friends and family”. However, once you complete your experiment package you may want to publish it so that you can reference it from your paper. To do that Chameleon supports integration with Zenodo, an open-access storage repository backed by CERN, for permanent artifact hosting. To share your artifact and store it on Zenodo, go to the “Share” page for the artifact. On the right-hand side you’ll see a list of all versions you’ve saved. Pick the version you want to publish to Zenodo and check “Request DOI”, then click “Save.”


Once published, Zenodo artifacts cannot be deleted and are additionally publicly available. Your artifact will appear in Trovi in the “Public” section, and any Chameleon user can access it, as can anybody on the Internet via Zenodo’s own listing.

This also creates a DOI, which you can easily include in your paper. The artifacts shared on Zenodo also appear on Trovi.