Concurrent installations can lose updates to easy-install.pth

Jan Mikkelsen avatarJan Mikkelsen created an issue

An entry for a package in easy-install.pth can be lost if there is a concurrent installation process installing a different package.

The installation reads easy-install.pth, closes the file handle, updates it in-core, then reopens the file and writes out the updated data. If two processes read the file concurrently, one of the updates will be lost.

An approach would be to open the file read/write, take a lock on the file using (say) lockf, read the file, perform in-core updates, truncate the file, write the new contents, close the file handle.

This is causing build failures in our system image build process where we build full system images with many packages from scratch for installation on to read-only filesystems.

Comments (1)

  1. Log in to comment
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.