#!/bin/bash
# Inspired by Debian and RedHat run-parts but portable and specific to di-b.
#
# Copyright 2012 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

allowed_regex=${RUN_PARTS_REGEX:-"^[0-9A-Za-z_-]+$"}
show_list=

set -ue
set -o pipefail

name=$(basename $0)

function usage {
    echo "Usage: $name [OPTION] scripts_directory"
    echo "Option:"
    echo "      --list  print names of all valid files"
    echo
    echo "Examples:"
    echo "      dib-run-parts --list /opt/stack/os-config-refresh/configure.d/"
    echo "      dib-run-parts /opt/stack/os-config-refresh/configure.d/"
    exit 1
} >&2


function output_prefix {
    printf "%s " "${name}" >&2
}

function output {
    output_prefix
    echo $* >&2
}

function output_printf {
    local FORMAT="$1"
    shift
    output_prefix
    printf "${FORMAT}" $@ >&2
}

function cleanup {
    rm -rf ${PROFILE_DIR}
}

# source the environment files from environment.d
#  arg : target_dir
function source_environment {

    local dir=$target_dir/../environment.d
    local env_files
    local xtrace

    if [ -d ${dir} ] ; then
        env_files=$(find ${dir} -maxdepth 1 -xtype f | \
                           grep -E "/[0-9A-Za-z_\.-]+$" | \
                           LANG=C sort -n)
        for env_file in $env_files ; do
            output "Sourcing environment file ${env_file}"
            # Set tracing as we import these environment files; it's
            # nice to see the definitions in the logs
            xtrace=$(set +o | grep xtrace)
            set -o xtrace
            source $env_file
            $xtrace
        done
    fi
}

if [ $# -lt 1 ] ; then
    usage
fi

if [ "$1" == "--list" ] ; then
    show_list="1"
    shift
fi

target_dir="${1:-}"

if ! [ -d "$target_dir" ] ; then
    output "Scripts directory [$target_dir] must exist and be a directory"
    usage
fi

# We specifically only want to sort *by the numbers*.
# Lexical sorting is not guaranteed, and identical numbers may be
# parallelized later
# Note: -maxdepth 1 ensures only files in the target directory (but not
# subdirectories) are run, which is the way run-parts behaves.
targets=$(find $target_dir -maxdepth 1 -xtype f -executable -printf '%f\n' | grep -E "$allowed_regex" | LANG=C sort -n || echo "")

if [ "$show_list" == "1" ] ; then
    for target in $targets ; do
        echo "${target_dir}/${target}"
    done
    exit 0
fi

DIB_DEBUG_TRACE=${DIB_DEBUG_TRACE:-0}
if [ ${DIB_DEBUG_TRACE} -gt 0 ]; then
    non_exec=$(find $target_dir -maxdepth 1 -xtype f \! -executable -printf '%f\n')
    if [ ! -z "$non_exec" ]; then
        output "Ignoring non-executable files: $non_exec"
    fi
    bad_filename=$(find $target_dir -maxdepth 1 -xtype f -executable -printf '%f\n' | grep -v -E "$allowed_regex" || echo "")
    if [ ! -z "$bad_filename" ]; then
        output "Ignoring non-conforming filenames: $bad_filename"
    fi
fi

PROFILE_DIR=$(mktemp -d --tmpdir profiledir.XXXXXX)
trap cleanup EXIT

# note, run this in a sub-shell so we don't pollute our
# own environment with source_environment
(
    source_environment

    for target in $targets ; do
        output "Running $target_dir/$target"
        target_tag=${target//\//_}
        date +%s.%N > $PROFILE_DIR/start_$target_tag
        $target_dir/$target
        target_tag=${target//\//_}
        date +%s.%N > $PROFILE_DIR/stop_$target_tag
        output "$target completed"
    done
)

output "----------------------- PROFILING -----------------------"
output ""
output "Target: $(basename $target_dir)"
output ""
output_printf "%-40s %9s\n" Script Seconds
output_printf "%-40s %9s\n" --------------------------------------- ----------
output ""
pushd $PROFILE_DIR > /dev/null
for target in $(find . -name 'start_*' -printf '%f\n' | env LC_ALL=C sort -n) ; do
    stop_file=stop_${target##start_}
    start_seconds=$(cat $target)
    stop_seconds=$(cat $stop_file)
    duration=$(echo - | awk "{ print $stop_seconds - $start_seconds }")
    LC_NUMERIC=C LC_ALL=C output_printf "%-40s %10.3f\n" ${target##start_} $duration
done
popd > /dev/null
rm -rf $PROFILE_DIR
output ""
output "--------------------- END PROFILING ---------------------"