Cannot access repository page: "FrozenError"

[Simon Rettberg]

On Focal, I cannot access any project's repository page (git), which results in an internal server error.

The log says:

---
Started GET "/projects/myproject-1/repository" for <IPADDRESS> at 2020-06-02 11:50:42 +0200
Processing by RepositoriesController#show as HTML
  Parameters: {"id"=>"myproject-1"}
  Current user: username01 (id=60)
Completed 500 Internal Server Error in 161ms (ActiveRecord: 78.3ms)

FrozenError (can't modify frozen String: ""):

lib/redmine/scm/adapters/abstract_adapter.rb:279:in `force_encoding'
lib/redmine/scm/adapters/abstract_adapter.rb:279:in `scm_iconv'
lib/redmine/scm/adapters/git_adapter.rb:136:in `entries'
app/models/repository/git.rb:98:in `scm_entries'
app/models/repository.rb:204:in `entries'
app/controllers/repositories_controller.rb:86:in `show'
lib/redmine/sudo_mode.rb:63:in `sudo_mode'
---

I found this issue in the redmine issue tracker which suggests this is an incompatibility with ruby 2.7 which is too new, and that redmine 4.1.x resolved the issue:

https://www.redmine.org/issues/33021

I tried applying the commit referenced towards the end of that issue locally, and unsurprisingly there were a bunch of conflicts, but it appears that the few files that actually got patched cleanly were enough to make the repository view work again, so maybe backporting the patch is the way to go.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Veldkornet (veldkornet)]

Will we be getting a fix for this?

[Rumplestilzken (rumplestilzken)]

Instead of using the debian package to install redmine install from subversion

https://www.redmine.org/projects/redmine/wiki/Download use 4.2.3

Using instructions here:

https://www.redmine.org/projects/redmine/wiki/redmineinstall

4.2 has support fully for ruby 2.7