This has been implemented in https://github.com/mwoehlke-kitware/Slicer/tree/2912-install-extension-dependencies.

After uploading to extensions, Test-2912-A and Test-2912-B:

• both containing two CLIs
• Test-2912-B depending on Test-2912-A

... I got the following assert after trying to install "Test-2912-B"

8<----8<----8<----8<----8<----8<----8<----8<----8<----8<----
"Retrieving extension metadata [ extensionId: 45327]"
ASSERT: "queryResult.Result.count()" in file /home/jchris/Projects/Slicer-1-SuperBuild-Qt485/qRestAPI/qMidasAPI.cpp, line 116
error: [/home/jchris/Projects/Slicer-1-SuperBuild-Qt485/Slicer-build/bin/./SlicerApp-real] exit abnormally - Report the problem.
8<----8<----8<----8<----8<----8<----8<----8<----8<----8<----

I am looking to the problem. And will provide more details shortly.

Let me know if there are update that need to be pushed server side ?

I just tested the new topic. Works great. Please integrate.

"Fixed" in r23212.

Right now this relies on the .s4ext packaged with the extension for the dependency list, so e.g. it is not possible to know dependencies before the extension is downloaded. Eventually we would like the server to report dependencies also, but that will be addressed at a later time.

It works great, except that if one extension is specified as dependent and does not exist (ie: if there is a problem during its compilation), Slicer crashes at the end of the download of the first extension (when it verifies the dependencies?).

@fbudin, did it crash, or are you hitting the assert in qMidasAPI.cpp that jcfr mentioned above? That assert happens when we ask about an extension that doesn't exist, which is a legitimate response from the server... ergo the assert is probably a bug.

I get the following message in the terminal:
"Retrieving extension metadata [ extensionId: 45473]"
"Downloading extension [ itemId: 137994]"
ASSERT: "queryResult.Result.count()" in file /devel/linux/Slicer4_linux64/Slicer4-trunk-build-VTK5/qRestAPI/qMidasAPI.cpp, line 116
error: [/devel/linux/Slicer4_linux64/Slicer4-trunk-build-VTK5/Slicer-build/bin/./SlicerApp-real] exit abnormally - Report the problem.

And Slicer closes.

Additional feedback: If the dependent extension is already install, Slicer still ask about installing it. It is not a big issue, but it would look more polish if Slicer was asking about installing the additional extension only if necessary.

Attached patch should fix the issue mentioned in #0011951.

@Matt: Patch looks good. Please integrate.

Issue mentioned in #0011951 fixed in r23253.

Just FYI, I still had the same problem as in #0011933 with r23261

"Retrieving extension metadata [ extensionId: 46533]"
"Downloading extension [ itemId: 139110]"
ASSERT: "queryResult.Result.count()" in file /devel/linux/Slicer4_linux64/Slicer4-trunk-build-VTK6/qRestAPI/qMidasAPI.cpp, line 116
error: [/opt/Francois/bin/Slicer-4.3.1-2014-05-29-linux-amd64-VKT6/./bin/SlicerApp-real] exit abnormally - Report the problem.

Closing resolved issues that have not been updated in more than 3 months.