pre-commit SVN hook to prevent a commit if Jenkins is building or build is broken

gistfile1.sh

#!/bin/sh

# PRE-COMMIT HOOK
#
# The pre-commit hook is invoked before a Subversion txn is
# committed.  Subversion runs this hook by invoking a program
# (script, executable, binary, etc.) named 'pre-commit' (for which
# this file is a template), with the following ordered arguments:
#
#   [1] REPOS-PATH   (the path to this repository)
#   [2] TXN-NAME     (the name of the txn about to be committed)
#
#   [STDIN] LOCK-TOKENS ** the lock tokens are passed via STDIN.
#
#   If STDIN contains the line "LOCK-TOKENS:\n" (the "\n" denotes a
#   single newline), the lines following it are the lock tokens for
#   this commit.  The end of the list is marked by a line containing
#   only a newline character.
#
#   Each lock token line consists of a URI-escaped path, followed
#   by the separator character '|', followed by the lock token string,
#   followed by a newline.
#
# 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 txn is committed; but
# if it exits with failure (non-zero), the txn is aborted, no commit
# takes place, and STDERR is returned to the client.   The hook
# program can use the 'svnlook' utility to help it examine the txn.
#
# On a Unix system, the normal procedure is to have 'pre-commit'
# invoke other programs to do the real work, though it may do the
# work itself too.
#
#   ***  NOTE: THE HOOK PROGRAM MUST NOT MODIFY THE TXN, EXCEPT  ***
#   ***  FOR REVISION PROPERTIES (like svn:log or svn:author).   ***
#
#   This is why we recommend using the read-only 'svnlook' utility.
#   In the future, Subversion may enforce the rule that pre-commit
#   hooks should not modify the versioned data in txns, or else come
#   up with a mechanism to make it safe to do so (by informing the
#   committing client of the changes).  However, right now neither
#   mechanism is implemented, so hook writers just have to be careful.
#
# Note that 'pre-commit' 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-commit.bat' or 'pre-commit.exe',
# but the basic idea is the same.
#
# The hook program typically does not inherit the environment of
# its parent process.  For example, a common problem is for the
# PATH environment variable to not be set to its usual value, so
# that subprograms fail to launch unless invoked via absolute path.
# If you're having unexpected problems with a hook program, the
# culprit may be unusual (or missing) environment variables.
# 
# Here is an example hook script, for a Unix /bin/sh interpreter.
# For more examples and pre-written hooks, see those in
# /usr/share/subversion/hook-scripts, and in the repository at
# http://svn.apache.org/repos/asf/subversion/trunk/tools/hook-scripts/ and
# http://svn.apache.org/repos/asf/subversion/trunk/contrib/hook-scripts/

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

# Make sure that the log message contains some text.
SVNLOOK=/usr/bin/svnlook
$SVNLOOK log -t "$TXN" "$REPOS" | \
   grep "[a-zA-Z0-9]" > /dev/null || exit 1

# Get the author of the commit
AUTHOR="$($SVNLOOK author -t $TXN $REPOS)"

# Get result of last build
JSON=$(wget -qO- http://127.0.0.1:8080/job/$YOUR_JOB/lastBuild/api/json)
RESULT=$(echo $JSON | grep -oe '"result":"\w\+"' | cut -d \" -f4 | tr -d '\n')

if [ -z $RESULT ]; then
    echo "Commit not allowed at the moment, a build is running" > /dev/stderr
    exit 1
elif [ $RESULT != "SUCCESS" ]; then
    # TODO Make a better regular expression in case Jenkins API changes
    # Capturing the culprit, last SVN user who committed
    CULPRIT=$(echo $JSON | grep -oe '/user/\w\+' | cut -d \/ -f3 | tail -1)
    # Capturing their full name too
    FULLNAME=$(echo $JSON | grep -oe '"fullName":".*"' | cut -d \" -f4)

    # Only the person who broke the build is allowed to fix it
    if [ $AUTHOR != $CULPRIT ]; then
        echo "Commit not allowed, the build is broken" > /dev/stderr
        echo "Contact SVN user $FULLNAME who broke the build" > /dev/stderr
        exit 1
    fi
fi

# Exit on all errors.
set -e

# Check that the author of this commit has the rights to perform
# the commit on the files and directories being modified.
#"$REPOS"/hooks/commit-access-control.pl "$REPOS" $TXN \
#  "$REPOS"/hooks/commit-access-control.cfg

# All checks passed, so allow the commit.

exit 0