Hello Guix! I’ve just pushed a simple log rotation service for Shepherd:
https://git.savannah.gnu.org/cgit/shepherd.git/commit/?h=devel&id=0484726801c2b5c1b7deecb9a96054c2c510ac71 It rotates log files roughly the same way we’ve been doing since the 70’s, but there’s a couple of advantages compared to what we’re currently doing in Guix System: • No need to repeat the name of log files since shepherd already knows them via #:log-file (that’s another reason to avoid non-shepherd-managed log files). • Rotation is race-free: it’s impossible to lose a line of log while the file is being rotated. This is guaranteed by the “logger”, which offers a method to atomically close its log file, rename it, and open a new empty log file. • The log rotation service is a timer so one can inspect it with ‘herd status log-rotation’, trigger it with ‘herd trigger log-rotation’, and so on. At this point the log file of shepherd itself, for instance /var/log/messages, is not handled; this will have to be fixed. There aren’t many options to specify how to rotate logs (very few compared to rottlog!), but I figured we’d rather have something simple that works well and without surprises; we can always add knobs later if necessary. Feedback welcome! Ludo’.
