Subversion

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Really, subversion is no longer where it's at (although it's an excellent replacement for cvs, should any unfortunate souls still be using that in this day and age). Try distributed source code control systems like git.

Using subversion with build processes

  • Realize that most subversion software, including svnversion and svn-clean, rely on the .svn metadata embedded in checkouts to operate properly. Bundling up this metadata will, generally, roughly double the size of distributed tarballs (especially for repositories with much binary data).

Keeping $HOME in subversion

  • Don't keep transient files under control, particularly things like browser cache or bash history.
  • Don't keep things like ssh and GnuPG keys in there; use symbolic links and a second repository

XML svn logs

As noted on the xmlstarlet page, svn can generate well-formed XML output for its log command. This can be very handy for writing robust scripts. Use --xml to generate XML, and -v to provide additional data (files edited, etc).

Recipes

  • All commits from a given authorname USER, with details
    • svn log -d --xml | xml sel -t -c "//logentry[author='USER']"
  • All commits to a given repopath PATH, with details
    • svn log -d --xml | xml sel -t -c "//logentry[paths/path='PATH']"

Hook Examples

Pre-commit

#!/bin/sh

umask 0002 || exit 1

REPOS="$1"
TXN="$2"

# must use log messages you aloof little bitches
svnlook log -t "$TXN" "$REPOS" | grep "[a-zA-Z0-9]" || { echo "Empty logfiles are disallowed." >&2 ; exit 1 ; }

Post-commit

#!/bin/bash

set -e
set -o nounset
set -o pipefail

umask 0002

export REPOS="$1"
export REV="$2"

LASTREV="$(($REV - 1))"
REPONAME="`basename $REPOS`"
MSG="`svn log --xml -r$REV file://$REPOS | xmlstarlet sel -t -v //msg`"

TITLE="`echo $MSG | cut -b-56`"

AUTHOR="`svn log --xml -r$REV file://$REPOS | xmlstarlet sel -t -v //author`"
AUTHORMAIL="`finger -m -p $AUTHOR | head -n1 | cut -d: -f3- | cut -b2-` <$AUTHOR@providence.research.sys>"

( echo -e "From: $AUTHORMAIL" && \
echo "Subject: [$REPONAME-$REV] $TITLE" && \
echo -e "\n" && echo "`echo $MSG | fmt -w72 - `" && echo && \
svn diff file://$REPOS@$LASTREV file://$REPOS@$REV && \
echo -e "\n-- \ngenerated by $0 on $HOSTNAME\nreport bugs to nblack@securecomputing.com" \
) | snmail -s -c "$REPONAME" sys.research.subversion.