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.


Some Trovi artifacts are supported by the Chameleon team and are denoted with a small Chameleon logo. You can contact the Help Desk if you are using these artifacts and encounter issues.

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. To delete single artifact versions, click the “trashcan” icon next to it in the edit view. To delete the entire artifact, click the red “Delete All” button.


Any artifacts published to Zenodo cannot be deleted.

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. Publish with DOI: this option allows you to publish a version of your artifact to Zenodo and receive a DOI, which you can use to cite your artifact in, e.g., an academic paper.
  2. Publish without DOI: this option allows any Chameleon user to find and launch your artifact. It can be useful if you want to distribute the artifact widely but do not necessarily with to publish it to Zenodo and get a DOI for citation.
  3. 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.
  4. Share with projects: this option allows you to share the experiment with members of a Chameleon Project. You can also share amongst multiple projects.

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.

If you wish to make your artifact public but don’t to publish it, use the “Publish without DOI” option. With this option it is possible to make the artifact private later on if you wish; this is not possible when publishing to Zenodo.

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

Using Day Passes

Normally, only Chameleon users with active allocations are able to launch and view Trovi artifacts. To allow anyone to launch an artifact, we also provide day passes. This allows for a non-Chameleon user to have access to Chameleon for a limited amount of time, using a small, separate allocation tied to your allocation. People interested in reproducing your project will send requests to the managers of a project. If approved, the requesting user will recieve an email invitation to join the reproducibility project. When they accept, they can use this project to run your artifact. After the specified time limit, they will be automatically removed from this project.

Allowing Reproducibility Requests

First, the owner of an artifact must permit reproducibility requests. This can be revoked at any time, preventing future requests. Additionally, you must also give your artifact a value for “Hours a user has to reproduce.” This value specifies how long a user will have access to Chameleon for. Consider how long it takes to run your experiment from start to finish as a lower bound for this value. The artifact owner must also assign their artifact to a project via the dropdown selector. As these requests are granting access to Chameleon resources, this is needed to tie granted requests to a PI.

These fields can be accessed by navigating to an artifact’s detail page, and then selecting “Share.” At the bottom of the share page, you will see the below forms, which are the project assignment, the enabling of reproducibility requests, and the hours to reproduce.

An image showing the sharing fields for reproducibility requests

After these items are saved, an allocation request is automatically made. Your artifact should now appear with a “Request Day Pass” button below the “Launch” button. The “Launch” button will not appear for users that are not a member in an active Chameleon project.

Requesting a Day Pass

When you select “Request Day Pass”, you will be taken a form where you are asked to submit your name, institution, and a reason why you want to reproduce the artifact. The goal of this form is to explain to the PI why you are interested in reproducing the artifact, as the PI is still responsible for overseeing the proper use of Chameleon resources, and the PI may be a stranger to you.

An image showing the "Request Day Pass" button

After submitting the form, the managers (and PI) of the project associated with the artifact will receive an email informing them of the request.

Reviewing a Day Pass Request

After recieving an email with the day pass request, PIs and project managers can navigate to the review page by clicking the link in the email. Here, they will see all of the details submitted with the request. A decision can be made by choosing “approved” or “rejected” in the selector, and then clicking submit.

An image showing the "Review Day Pass" screen

After this decision is made, an email is sent to the requestor with the result. If the request is approved, an invitation is sent to the user.

Using an Invitation

If your day pass request is approved, an email will be sent to you with an invite link. After clicking this link, you will be automatically added to the project. The email will also mention how long the invitation is for. When the invite is accepted, you will be taken to the project page for the reproducibility project. Please note the ID of the project (CHI-XXXXX), which may be needed to configure an artifact.

Next, you can navigate back to the original artifact URL you were given. The “Launch” button can be used now to start running the artifact.

After the duration for the invite has passed, you will be automatically removed from the project.