blog.plee.me About software, technology and random things

23Jun/190

Missing Credentials in Dropdown for Jenkins Build Configuration

Hello!

Recently I updated my Jenkins installation including all of the plugins. One of them must have brought somewhat breaking changes because when I tried to create a new build configuration for a new old project of mine, I could not select the proper credentials in the dropdown. I only had the option to add new ones even though I had added the corresponding credentials in the global scope (as per usual), so they must have been visible across the entire Jenkins instance. None of them were showing up. And even when I tried adding new ones through the build configuration page, they ended up not being active / selected either.

When I went back to check with an existing build configuration I had configured over a year before, I could confirm the same behavior. For build parameters the credentials dropdowns were empty and for the VCS credentials it said

Cannot find any credentials with id <ID>

I spent a couple of hours looking for solutions and I did find some cases that popped up around 1 or 2 years ago, but nothing that fit this exact scenario. My suspicion was that this might be a bug, so I tried rolling back the SSH credentials and credentials plugins to the previous versions, but that did not fix anything.

I decided to wait for a week in the hopes of potential bug fix releases to come out for either some of the plugins or Jenkins itself, but a week later in spite of a couple of updates here and there, nothing about the problem had changed.

And then I found a comment in the discussion thread of a GitHub issue of the "GitHub Pull Request Builder Plugin" (which I am not even using). In it, the following solution was proposed:

  1. Navigate to "Jenkins" (main menu) => "Manage Jenkins" => "Configure Global Security"
  2. Go to the "Access Controls for Builds" section
  3. Under "Project default Build Authorization" check if the "Strategy" is set to "Run as anonymous" (which was the case for me)
  4. If yes, try changing it to "Run as User who Triggered Build" (it might also work with another setting if that suits you better)
  5. Save and reload the build configuration settings

That was it! The credentials showed up again and I could execute the build successfully.

I know this seems to be a niche problem and there might only be a handful of people that have encountered the same issue, but I hope it was helpful nonetheless.

Thank you for reading!

5Aug/095

AJAX with Chrome – empty responseText

Hi there!

When I implemented AJAX today in a new script of mine and persuaded 😛 a couple of friends of mine to visit the page, I found that the Chrome users received error messages when trying to use the AJAX functions. However, they actually worked. The server received the AJAX request and processed it correctly, leaving me scratching my head.

Turns out that Chrome only received an empty AJAX response in responseText which caused the JavaScript function to throw out an error message. But why was it empty?

A couple of web searches later I realized that apparently not too many people had come across that problem. Luckily enough I found a post in a forum that pushed me in the right direction.

Chrome seems to be a little sensitive concerning headers in the AJAX responses. Because I hadn't given my server-side AJAX processing script the appropriate "Content-Type: text/plain" header, it didn't "accept" the response as text.

Why it has to be so picky, however, I cannot understand 🙂

If you have encountered that problem before, I hope I managed to help you out.

Certainly made me go a little crazy for a while there 😛

   
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