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2 nd SUMOVER Workshop: Code Management Systems

Surveyed various systems including source code versioning tools (CVS, Git), bug tracking systems (Bugzilla, Trac), and more. Currently utilizing Trac with Subversion, offering advantages over CVS like atomic commits and directory versioning. The workshop also focuses on Apache, load tuning, and anti-spam measures for efficient code management.

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2 nd SUMOVER Workshop: Code Management Systems

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  1. 2nd SUMOVER Workshop:Code Management Systems

  2. WP2: Software management systems • Surveyed a number of systems • Source code versioning systems • CVS, RCS, Git, Bitkeeper, Arch, Subversion • Bug tracking systems • Bugzilla, Mantis, Trac • Static analysis tools, Testing suites, Doc systems • Now running selected system • Trac with Subversion • Imported all existing code and history • Local and external users active • Active use by other UCL 2nd SUMOVER Workshop - Code Management

  3. Subversion • Advantages over CVS • Atomic commits • Directory versioning • File renaming/deletion handled nicely • HTTP based access • WebDAV use for storage and retrieval • Apache/LDAP user authentication • File based Authorisation 2nd SUMOVER Workshop - Code Management

  4. Trac • Written in Python • Uses apache python • Subversion code access • Revisions, diffs, syntax colouring, line numbered • Wikis • Generally editable (despite Spam probs) • News, Tool info pages, Dev info, Docs… • Tickets • Bugs reports, Feature requests, milestone tracking 2nd SUMOVER Workshop - Code Management

  5. Apache • Running apache-2.0.54 • Prefork mode (each HTTP request handled in a separate process) • Two virtual hosts • Mediatools.cs.ucl.ac.uk (User friendly name) • Apache rewrite used simply access and switch to SSL • Non-SSL access • Frostie.cs.ucl.ac.uk (Actual machine name) • Used by other projects • SSL capable • Utilises modules • WebDAV, Python, LDAP, SSL • LDAP • Simplifies/Converges user management • Provides authentication for Trac and Subversion users • Authorisation info for some Trac users 2nd SUMOVER Workshop - Code Management

  6. Load tuning • Robots.txt • Limited access to just main Source Code • Tuned apache • Match “MaxClients” to machine memory • Reduce KeepaliveTimeout to 5 secs • Removed non-essential modules 2nd SUMOVER Workshop - Code Management

  7. Anti-Spam measures • Implemented • Only certain ‘leaf’ pages are editable • SSL enabled: • Logged in users • Trac tickets and Comments • Added ticket modification Trac module • Investigating • Apache modsecurity.org • Rule based application level firewall • Protection against a range of HTTP based attacks • Trac anti-spam module • Uses pattern matching to trip up spammers • CAPTCHA’s • "Completely Automated Public Turing test to tell Computers and Humans Apart" 2nd SUMOVER Workshop - Code Management

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