/usr/lib/fai/get-config-dir-svn is in fai-client 4.0.8~deb7u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69  | #!/bin/bash
# (c) 2002-2006 Henning Glawe <glaweh@debian.org>
### BEGIN SUBROUTINE INFO
# Provides-Var:
# Requires-Var:    $FAI_CONFIG_SRC $FAI $LOGDIR
# Suggests-Var:
# Short-Description: get $FAI from an svn repository.
### END SUBROUTINE INFO
# matched string: "svn://user@host/svnpath"
protocol=$(expr match "$FAI_CONFIG_SRC" '\([^:]*\)://')
# username may or may not be followed by a password
username=$(expr match "$FAI_CONFIG_SRC" '[^:]*://\([^@:]*\)[^@]*@')
if [ -n "$username" ] ; then
  svnpath=$(expr match "$FAI_CONFIG_SRC" '[^:]*://[^@]\+@\([^[:space:]]\+\)')
  # password definitely is preceded by a username
  password=$(expr match "$FAI_CONFIG_SRC" '[^:]*://[^@:]*:\([^@]*\)@')
  [ -n "$password" ] && pass="--password $password"
else
  svnpath=$(expr match "$FAI_CONFIG_SRC" '[^:]*://\([^[:space:]]\+\)')
fi
case $protocol in
        svn)
                svnurl="svn://$svnpath"
                ;;
        svn+file)
                svnurl="file://$svnpath"
                ;;
        svn+http)
                svnurl="http://$svnpath"
                ;;
        svn+https)
                svnurl="https://$svnpath"
                ;;
        svn+ssh)
    if [ -n "$username" ] ; then
                  svnurl="svn+ssh://$username@$svnpath"
    else
      svnurl=$FAI_CONFIG_SRC
    fi
                ;;
        *)
                echo "get-config-dir-svn: protocol $protocol not implemented"
                exit 1
                ;;
esac
user=
[ -n "$username" ] && user="--username $username"
if [ -d "$FAI/.svn" ] ; then
    if [ `svn info $FAI | grep '^URL:' | awk '{print $2}'` == "$svnurl" ]; then
        echo "Updating SVN in $FAI"
        cd $FAI
        svn up $user $pass | grep -v 'Updated to revision' > $LOGDIR/getconf.log
        task_error 881 ${PIPESTATUS[0]}
    else
        echo "$FAI already contains a svn repository, but it is not from $svnurl!" >&2
        echo "Please delete $FAI manually. Fatal error." >&2
        task_error 883
    fi
else
   echo "Checking out SVN"
   svn co $user $pass $svnurl $FAI | grep -v 'Checked out revision' > $LOGDIR/getconf.log
   task_error 882 ${PIPESTATUS[0]}
fi
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