Using Extensions That Assume Write Access
Learn how to create symbolic links from the code directory to a file.
Some modules and plugins create files within hard-coded paths outside of the standard path for the given framework, which can be problematic on Pantheon. WordPress stores files within
wp-content/uploads and Drupal uses
/sites/default/files. These directories are symbolically linked to Pantheon's cloud-based filesystem, Valhalla, which is writeable on all environments. Extensions that create files within the codebase (e.g.
/sites/all/modules/module-name/some-other-directory) incorrectly assume write access that is not granted on the Live and Test environments.
The best solution is to communicate with the maintainer of the module or plugin and request that hard-coded, nonstandard paths be fixed. Alternatively, you can create a symbolic link as a workaround to avoid failures on Test and Live.
Create a Symbolic Link
We do not recommend creating symlinks over SFTP due to inconsistencies amongst clients.
The following is for Mac and Linux only. Windows users may refer to Microsoft documentation for opening Command Prompt as an Administrator and creating symlinks using mklink or create symlinks within a virtual machine.
From your terminal,
cdto the site code repository:
cd ~/sites/myawesomesite/ #Change this to your project directory.
Move the directory you want to replace with a symlink. This serves two purposes; backing up any data that may otherwise be lost, and preventing the symlink from being nested inside the existing directory:
mv ./wp-content/path/plugin-expects-write-to ~/backups/
The command above moves the directory to a folder named backups in your home directory.
~/. Replace this with an existing backup location.
Create a symlink for the standard files path:
# The first path will be used as the new file destination instead of whatever path the plugin assumed write access to ln -s ./wp-content/uploads/new-directory ./wp-content/path/plugin-expects-to-write-to
lncommand is sensitive to the working directory, the folder your prompt is currently sitting in. The example above assumes you're in the main directory of your local git repository.
Stage your changes
git add .
git statusto review your current index, then commit your changes:
git commit -m "symlink non-standard files path to wp-content/uploads"
Push the changes to Pantheon:
git push origin master
Your commit can be seen in the Dev environments commit history. The plugin will now successfully write files within any environment, even when the Dev environment's connection mode is set to Git. In your previous configuration, the plugin would fail while in Git mode. You should not see the newly created files in the Dashboard as "ready to commit", as files are not version controlled.
In our example, we created the target directory of the symlink as ./wp-content/uploads/new-directory. Make sure this directory is created via SFTP if it does not exist yet.
Deploy to Test and confirm results.
- Deploy to Live and perform the plugin operation that creates the desired files, then confirm results.
Modules That Verify Directories
Some modules and plugins verify that the target directory exists using
is_dir() which returns bool(false) if the directory is a symlink. It may help to patch the module/plugin to use
is_link() instead of
Incorrect Symlink Paths
If a symlinked folder doesn't show the proper contents, doublecheck that the path is correct. In Bash,
ls -l will show symlinks paths:
$ ls -l lrwxr-xr-x 1 user group 39 Sep 13 14:29 images -> ../plugins/some-plugin/images/
Try changing the working directory in which you create the symlink, using
../ to refer to directories above the working directory, and
./ to refer to the currect directory.
For more details on creating symbolic links on Mac/Linux, see this thread.