It’s very convenient to use helm template to generate kubernetes manifests of your helm chart, for debugging purpose. But sometimes you might want to split those manifests to separate files according to its own kind.
Split manifests
Here is a solution which don’t require to install jq, yq or other tools, just use sed and awk.
#!/bin/bash
set -ex
# store all resources in a single file
cat >all.yaml
# create a directory to store the split resources
mkdir -p manifests
# use \n---\n as the separator of awk
sed -i 's/^---$/\n---\n/g' all.yaml # replace all --- lines with \n---\n
sed -i '1s/^/\n---\n/' all.yaml # make sure the first line starts with \n---\n
sed -i '/^[[:space:]]*$/d' all.yaml # remove all empty lines
# split resources into files by k8s kind
awk '
BEGIN { RS = "\n---\n"; idx = 0 } # define record separator
$0 ~ /kind:/ { # only process lines with "kind:"
kind = ""
if (match($0, /kind:[[:space:]]*([^[:space:]]+)/, arr)) {
kind = tolower(arr[1])
filename = "manifests/" kind ".yaml"
if (system("test -f " filename) == 0) {
print "---" >> filename # add YAML separator
}
print $0 >> filename
close(filename)
}
}
' all.yaml
# Cleanup
rm -f all.yaml
Usage
Just redirect the output of helm template to the above script, all k8s resources will be generated into a directory named manifests.
helm template vault hashicorp/vault | sh split-helm-template.sh
The struct of the directory:
├── manifests
│ ├── clusterrolebinding.yaml
│ ├── clusterrole.yaml
│ ├── configmap.yaml
│ ├── deployment.yaml
│ ├── mutatingwebhookconfiguration.yaml
│ ├── pod.yaml
│ ├── serviceaccount.yaml
│ ├── service.yaml
│ └── statefulset.yaml
└── split-helm-template.sh