!/bin/bash

Modified to replace {{ randFoo x }} functions in Go templates with preseeded random data.

Because Flux doesn't play well with code that isn't deterministic. (Thanks Elastic!)

Also allowed values file to be relative paths

Copyright 2019 The Kubernetes Authors.

SPDX-License-Identifier: Apache-2.0

Helm chart inflator

#

Reads a file like this

#

apiVersion: kustomize.config.k8s.io/v1

kind: ChartInflator

metadata:

name: notImportantHere

chartName: nameOfStableChart

values: /abs/path/to/local/values/file

chartHome: /abs/path/local/chart/storage

chartRelease: (stable|incubator)

chartVersion: 9.0.1

helmHome: /abs/path/to/helm/config

helmBin: /abs/path/to/helmBin

releaseName: nameOfHelmRelease

releaseNamespace: namespaceWhereHelmWouldApply

#

fetches the given chart from stable/$chartName,

and inflates it to stdout, using the given values file.

#

chartDir default: $TMP_DIR/charts

#

Example execution:

./plugin/someteam.example.com/v1/ChartInflator configFile.yaml

set -e

Added

if [[ -z "$RANDOM_SEED" ]]; then RANDOM_SEED=42 fi

export TMP_EVAL_RND="$(mktemp)" export TMP_RND="$(mktemp)" printf $RANDOM_SEED > $TMP_RND

cat > $TMP_EVAL_RND <

!/bin/bash

export RANDOM=\$(cat $TMP_RND) chr(){ a=\$((\$RANDOM % 50)) if [[ \$a -lt 26 ]]; then a=\$((\$a + 65)) else a=\$((\$a + 72)) fi printf "\x\$(printf %x \$a)" } num(){ printf \$((\$RANDOM % 10)) } printf '"' for i in \$(seq 0 \$2); do case \$1 in randAlpha*) chr;; randNumeric*) num;; *) if [[ \$((\$RANDOM % 2)) == 0 ]]; then chr; else num; fi;; esac done printf '"' printf \$RANDOM > $TMP_RND EOF chmod +x $TMP_EVAL_RND

function removeRandFromFile(){ file="$1" size_before=0 while [[ $(stat -c %s $file) -ne $size_before ]]; do size_before=$(stat -c %s $file) cat "$file" | awk '{ m=match($0,/rand(AlphaNum|Alpha|Ascii|Numeric)\s+[0-9]+/) if (m){ printf substr($0,0,RSTART-1) system("$TMP_EVAL_RND " substr($0,RSTART,RLENGTH)) print substr($0,RSTART+RLENGTH) } else { print $0 } }' > "$file.tmp"

    mv "$file.tmp" "$file"
done

}

function removeRand() { grep -rPl 'rand(AlphaNum|Alpha|Ascii|Numeric)\s+[0-9]+' "$1" | while read file; do removeRandFromFile "$file" done }

#

Yaml parsing is a ridiculous thing to do in bash,

but let's try:

function parseYaml { local file=$1 while read -r line do local k=${line%%:} local v=${line#:}

[ "$k" == "chartName" ] && chartName=$v
[ "$k" == "chartRepo" ] && chartRepo=$v
[ "$k" == "chartHome" ] && chartHome=$v
[ "$k" == "chartRelease" ] && chartRelease=$v
[ "$k" == "chartVersion" ] && chartVersion=$v
[ "$k" == "values" ] && valuesFile=$v
[ "$k" == "helmHome" ] && helmHome=$v
[ "$k" == "helmBin" ] && helmBin=$v
[ "$k" == "releaseName" ] && releaseName=$v
[ "$k" == "releaseNamespace" ] && releaseNamespace=$v
[ "$k" == "setFile" ] && setFile=$v

done <"$file"

# Trim leading space chartName="${chartName#"${chartName%%[![:space:]]}"}" chartRepo="${chartRepo#"${chartRepo%%[![:space:]]}"}" chartHome="${chartHome#"${chartHome%%[![:space:]]}"}" chartRelease="${chartRelease#"${chartRelease%%[![:space:]]}"}" chartVersion="${chartVersion#"${chartVersion%%[![:space:]]}"}" valuesFile="${valuesFile#"${valuesFile%%[![:space:]]}"}" helmBin="${helmBin#"${helmBin%%[![:space:]]}"}" releaseName="${releaseName#"${releaseName%%[![:space:]]}"}" releaseNamespace="${releaseNamespace#"${releaseNamespace%%[![:space:]]}"}" setFile="${setFile#"${setFile%%[![:space:]]}"}" }

TMP_DIR=$(mktemp -d)

parseYaml $1

Where all the files generated by 'helm init' live.

if [ -z "$helmHome" ]; then helmHome=$TMP_DIR/dotHelm fi

Where helm charts are unpacked.

if [ -z "$chartHome" ]; then chartHome=$TMP_DIR/charts fi

Set default chartRelease to "stable"

if [ -z "$chartRelease" ]; then chartRelease="stable" fi

The repo to pull the chart from

if [ -n "$chartRepo" ]; then chartRepoArg="--repo=$chartRepo" chartNameArg="$chartName" else chartNameArg="$chartRelease/$chartName" fi

Set version only if specified

if [ ! -z "$chartVersion" ]; then chartVersionArg="--version=$chartVersion" fi

if [ -z "$helmBin" ]; then helmBin=helm fi

if [ -z "$valuesFile" ]; then valuesFile=$chartHome/$chartName/values.yaml else [[ "$valuesFile" =~ \"^/\" ]] || valuesFile="$KUSTOMIZE_PLUGIN_CONFIG_ROOT/$valuesFile" fi

if [ -z "$releaseName" ]; then releaseName=release-name fi

if [ -z "$releaseNamespace" ]; then releaseNamespace=default fi

if [[ -n "$setFile" ]]; then setFile="--set-file $setFile" fi

function v2RunHelm { $helmBin --home $helmHome "$@" }

function v3RunHelm { XDG_CONFIG_DIR=$helmHome $helmBin "$@" }

function v2InitHelm { # The init command is extremely chatty v2RunHelm init --client-only >& /dev/null }

function v3InitHelm { # Do nothing - there's no init command in helm v3 true }

function v2PullChart { if [ ! -d "$chartHome/$chartName" ]; then v2RunHelm fetch $chartVersionArg \ $chartRepoArg \ --untar \ --untardir $chartHome \ $chartNameArg fi }

function v3PullChart { if [ ! -d "$chartHome/$chartName" ]; then v3RunHelm pull $chartVersionArg \ $chartRepoArg \ --untar \ --untardir $chartHome \ $chartNameArg fi }

function v2InflateChart { v2RunHelm template \ --name $releaseName \ --namespace $releaseNamespace \ --values $valuesFile \ $setFile $chartHome/$chartName }

function v3InflateChart { v3RunHelm template \ --release-name $releaseName \ --namespace $releaseNamespace \ --values $valuesFile \ $setFile $chartHome/$chartName

}

HELM_VERSION=$($helmBin version -c --short)

case $HELM_VERSION in 'Client: v2') v2InitHelm v2PullChart removeRand $chartHome ##### Added v2InflateChart ;; v3) v3InitHelm v3PullChart removeRand $chartHome ##### Added v3InflateChart ;; *) echo "[!] Unsupported 'helm' version '${HELM_VERSION}'" 1>&2 && exit 1 ;; esac

/bin/rm -rf $TMP_DIR $TMP_EVAL_RND $TMP_RND

ChartInflator.sh

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