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Source Code Control Systems

Source Code Control Systems. Jaap Akkerhuis jaap@nlnetlabs.nl. SCCS. Why How RCS CVS More and more. Why Version Control. Software Engineering Auditing capabilaties Change tracking Undo mistakes. Method. Archive (per file) Deltas between versions

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Source Code Control Systems

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  1. Source Code Control Systems Jaap Akkerhuis jaap@nlnetlabs.nl

  2. SCCS • Why • How • RCS • CVS • More and more

  3. Why Version Control • Software Engineering • Auditing capabilaties • Change tracking • Undo mistakes

  4. Method • Archive (per file) • Deltas between versions • Delta's upon a complete version (SCCS) • Last version complete (RCS), delta's with previous • Branching, merging • for software Engineering

  5. RCS intro • Archive with extension ,v • In sub directory RCS (if exists) • Commands asks • descriptive text • comments for changes

  6. RCS: ci & co • CI: Checks a file in an archive • removes file • first time aks description • CO: Checks a file out an archive • file mode Read Only • CO -l • check out and locks file (RW) • CI -u • Updates archive • leaves file RO

  7. Combined actions • ci -l • ci -u; co -l • rcsdiff -v1.1 -v1.9 • compares version • co -v1.1 > 1; co -v1.9 > 9; diff 1 9; rm 1 9

  8. Auditing • Comments in Archive • rlog pokes in archive • RCS keywords in binary • $Log$ • TLD IN TXT "tld zone version $Log$ • Ident for binaries • Locks changes by other users

  9. CVS • Based on RCS • Shell scripts by Dick Grune • Optimistic concurrency model • users seldom hack the same concurrently • Remote access • Keeps removed files in attic • allows going back in time

  10. CVS repository • Central archive for project • Check out a whole project • cvs checkout • make changes • commit changes • merges files and changes • notifies for conflicting merges

  11. Further googling • www.cvshome.org • subversion • tons of commercial software

  12. Questions ???

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