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#!/bin/sh
# PRE-LOCK HOOK
#
# The pre-lock hook is invoked before an exclusive lock is
# created. Subversion runs this hook by invoking a program
# (script, executable, binary, etc.) named 'pre-lock' (for which
# this file is a template), with the following ordered arguments:
#
# [1] REPOS-PATH (the path to this repository)
# [2] PATH (the path in the repository about to be locked)
# [3] USER (the user creating the lock)
# [4] COMMENT (the comment of the lock)
# [5] STEAL-LOCK (1 if the user is trying to steal the lock, else 0)
#
# If the hook program outputs anything on stdout, the output string will
# be used as the lock token for this lock operation. If you choose to use
# this feature, you must guarantee the tokens generated are unique across
# the repository each time.
#
# The default working directory for the invocation is undefined, so
# the program should set one explicitly if it cares.
#
# If the hook program exits with success, the lock is created; but
# if it exits with failure (non-zero), the lock action is aborted
# and STDERR is returned to the client.
# On a Unix system, the normal procedure is to have 'pre-lock'
# invoke other programs to do the real work, though it may do the
# work itself too.
#
# Note that 'pre-lock' must be executable by the user(s) who will
# invoke it (typically the user httpd runs as), and that user must
# have filesystem-level permission to access the repository.
#
# On a Windows system, you should name the hook program
# 'pre-lock.bat' or 'pre-lock.exe',
# but the basic idea is the same.
#
# Here is an example hook script, for a Unix /bin/sh interpreter:
REPOS="$1"
PATH="$2"
USER="$3"
COMMENT="$4"
STEAL="$5"
# If a lock exists and is owned by a different person, don't allow it
# to be stolen (e.g., with 'svn lock --force ...').
# (Maybe this script could send email to the lock owner?)
SVNLOOK=/usr/local/bin/svnlook
GREP=/bin/grep
SED=/bin/sed
LOCK_OWNER=`$SVNLOOK lock "$REPOS" "$PATH" | \
$GREP '^Owner: ' | $SED 's/Owner: //'`
# If we get no result from svnlook, there's no lock, allow the lock to
# happen:
if [ "$LOCK_OWNER" = "" ]; then
exit 0
fi
# If the person locking matches the lock's owner, allow the lock to
# happen:
if [ "$LOCK_OWNER" = "$USER" ]; then
exit 0
fi
# Otherwise, we've got an owner mismatch, so return failure:
echo "Error: $PATH already locked by ${LOCK_OWNER}." 1>&2
exit 1
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