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#!/bin/sh
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# PRE-UNLOCK HOOK
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#
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# The pre-unlock hook is invoked before an exclusive lock is
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# destroyed.  Subversion runs this hook by invoking a program
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# (script, executable, binary, etc.) named 'pre-unlock' (for which
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# this file is a template), with the following ordered arguments:
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#
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#   [1] REPOS-PATH   (the path to this repository)
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#   [2] PATH         (the path in the repository about to be unlocked)
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#   [3] USER         (the user destroying the lock)
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#   [4] TOKEN        (the lock token to be destroyed)
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#   [5] BREAK-UNLOCK (1 if the user is breaking the lock, else 0)
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#
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# If the hook program exits with success, the lock is destroyed; but
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# if it exits with failure (non-zero), the unlock action is aborted
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# and STDERR is returned to the client.
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#
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# The default working directory for the invocation is undefined, so
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# the program should set one explicitly if it cares.
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#
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# On a Unix system, the normal procedure is to have 'pre-unlock'
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# invoke other programs to do the real work, though it may do the
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# work itself too.
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#
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# Note that 'pre-unlock' must be executable by the user(s) who will
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# invoke it (typically the user httpd runs as), and that user must
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# have filesystem-level permission to access the repository.
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#
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# On a Windows system, you should name the hook program
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# 'pre-unlock.bat' or 'pre-unlock.exe',
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# but the basic idea is the same.
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#
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# The hook program runs in an empty environment, unless the server is
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# explicitly configured otherwise.  For example, a common problem is for
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# the PATH environment variable to not be set to its usual value, so
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# that subprograms fail to launch unless invoked via absolute path.
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# If you're having unexpected problems with a hook program, the
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# culprit may be unusual (or missing) environment variables.
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#
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# CAUTION:
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# For security reasons, you MUST always properly quote arguments when
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# you use them, as those arguments could contain whitespace or other
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# problematic characters. Additionally, you should delimit the list
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# of options with "--" before passing the arguments, so malicious
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# clients cannot bootleg unexpected options to the commands your
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# script aims to execute.
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# For similar reasons, you should also add a trailing @ to URLs which
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# are passed to SVN commands accepting URLs with peg revisions.
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#
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# Here is an example hook script, for a Unix /bin/sh interpreter.
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# For more examples and pre-written hooks, see those in
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# the Subversion repository at
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# http://svn.apache.org/repos/asf/subversion/trunk/tools/hook-scripts/ and
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# http://svn.apache.org/repos/asf/subversion/trunk/contrib/hook-scripts/
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REPOS="$1"
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PATH="$2"
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USER="$3"
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TOKEN="$4"
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BREAK="$5"
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# If a lock is owned by a different person, don't allow it be broken.
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# (Maybe this script could send email to the lock owner?)
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SVNLOOK=/usr/local/bin/svnlook
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GREP=/bin/grep
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SED=/bin/sed
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LOCK_OWNER=`$SVNLOOK lock "$REPOS" "$PATH" | \
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            $GREP '^Owner: ' | $SED 's/Owner: //'`
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# If we get no result from svnlook, there's no lock, return success:
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if [ "$LOCK_OWNER" = "" ]; then
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  exit 0
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fi
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# If the person unlocking matches the lock's owner, return success:
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if [ "$LOCK_OWNER" = "$USER" ]; then
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  exit 0
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fi
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# Otherwise, we've got an owner mismatch, so return failure:
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echo "Error: $PATH locked by ${LOCK_OWNER}." 1>&2
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exit 1