#!/bin/bash
#
# Run Valgrind, condensing logged reports into an exit code.
#
# Copyright (C) 2014 Red Hat
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -o nounset -o pipefail -o errexit
shopt -s extglob

function usage()
{
    cat <<EOF
Usage: `basename "$0"` ERROR_EXITCODE [PATH_PATTERN...] [-- VALGRIND_ARG...]
Run Valgrind, condensing logged reports into an exit code.

Arguments:
    ERROR_EXITCODE  An exit code to return if at least one error is found in
                    Valgrind log files.
    PATH_PATTERN    An extended glob pattern matching the (original) path to
                    the program to execute under Valgrind. If the program path
                    doesn't match any patterns, the program is executed
                    directly, without Valgrind. Without patterns any program
                    path matches.
    VALGRIND_ARG    An argument to pass to Valgrind after the arguments
                    specified by `basename "$0"`.

The first non-option VALGRIND_ARG, or the first VALGRIND_ARG after a "--",
will be considered the path to the program to execute under Valgrind and will
be used in naming Valgrind log files as such:

    PROGRAM_NAME.PID.valgrind.log

where PROGRAM_NAME is the filename portion of the program path and PID is the
executed process ID. If the last directory of the program path is ".libs" and
the filename begins with "lt-", both are removed to match the name of libtool
frontend script. All files matching PROGRAM_NAME.*.valgrind.log are removed
before invoking Valgrind.

If an error is found in Valgrind log files, ERROR_EXITCODE is returned,
otherwise Valgrind exit code is returned.
EOF
}


if [[ $# == 0 ]]; then
    echo "Invalid number of arguments." >&2
    usage >&2
    exit 1
fi

declare error_exitcode="$1";    shift
declare -a path_pattern_list=()
declare arg
declare collecting_argv
declare -a program_argv=()
declare program_path
declare program_name
declare path_pattern
declare match
declare status=0

# Extract path patterns
while [[ $# != 0 ]]; do
    arg="$1"
    shift
    if [[ "$arg" == "--" ]]; then
        break
    else
        path_pattern_list+=("$arg")
    fi
done

# Find program argv list in Valgrind arguments
collecting_argv=false
for arg in "$@"; do
    if ! "$collecting_argv" && [[ "$arg" == "--" ]]; then
        collecting_argv=true
    elif "$collecting_argv" || [[ "$arg" != -* ]]; then
        collecting_argv=true
        program_argv+=("$arg")
    fi
done

if [[ ${#program_argv[@]} == 0 ]]; then
    echo "Program path not specified." >&2
    usage >&2
    exit 1
fi
program_path="${program_argv[0]}"

# Match against path patterns, if any
if [[ ${#path_pattern_list[@]} == 0 ]]; then
    match=true
else
    match=false
    for path_pattern in "${path_pattern_list[@]}"; do
        if [[ "$program_path" == $path_pattern ]]; then
            match=true
        fi
    done
fi

# Run the program
if $match; then
    # Generate original path from libtool path
    program_path=`sed -e 's/^\(.*\/\)\?\.libs\/lt-\([^\/]\+\)$/\1\2/' \
                        <<<"$program_path"`

    program_name=`basename -- "$program_path"`

    rm -f -- "$program_name".*.valgrind.log
    valgrind --log-file="$program_name.%p.valgrind.log" "$@" || status=$?

    if grep -q '^==[0-9]\+== *ERROR SUMMARY: *[1-9]' -- \
                "$program_name".*.valgrind.log; then
        exit "$error_exitcode"
    else
        exit "$status"
    fi
else
    "${program_argv[@]}"
fi