Adds a new templating function called `readDir`. With `readDir` users can read the contents of a specified directory and get a list of all contained files. This is useful when reading a bunch of files from a directory. The following example shows a snippet of a values file for configuring a Logstash deployment. Using only `readFile`, a user must specify each file by hand and adjust this list as the number of files to be read grows.
```yaml
logstash:
configs:
logstash.yml: |
{{- tpl (readFile "config/logstash.yml.gotmpl") . | nindent 6 }}
jvm.options: |
{{- readFile "config/jvm.options" | nindent 6 }}
pipelines.yml: |
{{- readFile "config/pipelines.yml" | nindent 6 }}
pipelines:
beats-log4j.conf: |
{{- readFile "config/pipelines/beats-log4j.conf" | nindent 6 }}
nginx-access.conf: |
{{- readFile "config/pipelines/nginx-access.conf" | nindent 6 }}
nginx-error.conf: |
{{- readFile "config/pipelines/nginx-error.conf" | nindent 6 }}
syslog-logs.conf: |
{{- readFile "config/pipelines/syslog-logs.conf" | nindent 6 }}
tcp-logs.conf: |
{{- readFile "config/pipelines/tcp-logs.conf" | nindent 6 }}
udp-debug.conf: |
{{- readFile "config/pipelines/udp-debug.conf" | nindent 6 }}
udp-logs.conf: |
{{- readFile "config/pipelines/udp-logs.conf" | nindent 6 }}
certificates:
ca.crt: |
{{- readFile "config/certificates/ca.crt" | nindent 6 }}
logstash.crt: |
{{- readFile "config/certificates/logstash.crt" | nindent 6 }}
logstash.key: |
{{- readFile "config/certificates/logstash.key" | nindent 6 }}
```
With `readDir` the above snippet can be rewritten as follows:
```yaml
logstash:
configs:
{{- range readDir "config" }}
{{ base . }}: |
{{- if hasSuffix "gotmpl" . }}
{{- tpl (readFile .) $ | nindent 6 }}
{{- else }}
{{- readFile . | nindent 6 }}
{{- end }}
{{- end }}
pipelines:
{{- range readDir "config/pipelines" }}
{{ base . }}: |
{{- readFile . | nindent 6 }}
{{- end }}
certificates:
{{- range readDir "config/certificates" }}
{{ base . }}: |
{{- readFile . | nindent 6 }}
{{- end }}
```
* feat(tmpl): added fetchSecretValue template function
This adds a tmpl `fetchSecretValue` and `expandSecretRefs` function by:
- Adding:
- `expandSecretRefs` function in tmpl package that uses vals
package to fetch secrets
- `fetchSecretValue` function in tmpl package like below but for
single string value
- gomock for tests purpose
- Changing:
- move init of vals package to function (so the same instance can be used for template values and rendering the whole template)
* doc(secret): added doc how to use new tmpl methods
Added example usage of `fetchSecretValue` and `expandSecretRefs`
Enhances Helmfile to print more helpful message on error while calling `exec` template function.
Helmfile has been printing error messages like the below:
```
in ./helmfile.yaml: error during helmfile.yaml.part.0 parsing: template: stringTemplate:5:8: executing "stringTemplate" at <exec "./exectest.sha" (list)>: error calling exec: exit status 1
```
Adding captured stdout and stderr, with some indentation to make it readable, it now produces the following message on missing executable:
```
$ make build && ./helmfile build
go build
in ./helmfile.yaml: error during helmfile.yaml.part.0 parsing: template: stringTemplate:5:8: executing "stringTemplate" at <exec "./exectest.sha" (list)>: error calling exec: fork/exec ./exectest.sha: no such file or directory
COMMAND:
./exectest.sha
ERROR:
fork/exec ./exectest.sha: no such file or directory
```
On non-zero exit status without output:
```
$ make build && ./helmfile build
go build
in ./helmfile.yaml: error during helmfile.yaml.part.0 parsing: template: stringTemplate:5:8: executing "stringTemplate" at <exec "./exectest.sh" (list)>: error calling exec: exit status 1
COMMAND:
./exectest.sh
ERROR:
exit status 1
```
On non-zero exit status with output:
```
$ make build && ./helmfile build
go build
in ./helmfile.yaml: error during helmfile.yaml.part.0 parsing: template: stringTemplate:5:8: executing "stringTemplate" at <exec "./exectest.sh" (list)>: error calling exec: exit status 2
COMMAND:
./exectest.sh
ERROR:
exit status 2
COMBINED OUTPUT:
out1
err1
```
Resolves#1158
Quan TRAN
Anton Bretting
Yusuke Kuoka
Nils
Yoann Ciabaud
Marcin Kaciuba
RaymondKYLiu
a-hat