(Background information)
In our company we are checking the sops-encrypted Linkerd manifest into GitHub repository,
and I came across the following problem.
---
Three dashes mean the start of the YAML document (or the end of the
directive).
https://yaml.org/spec/1.2/spec.html#id2800132
If there are only comments between `---`, the document is empty.
Assume the file which include an empty document at the top of itself.
```yaml
---
# foo
---
apiVersion: v1
kind: Namespace
metadata:
name: foo
---
# bar
---
apiVersion: v1
kind: Namespace
metadata:
name: bar
```
When we encrypt and decrypt it with [sops](https://github.com/mozilla/sops), the empty document will be
converted to `{}`.
```yaml
{}
---
apiVersion: v1
kind: Namespace
metadata:
name: foo
---
apiVersion: v1
kind: Namespace
metadata:
name: bar
```
It is invalid as k8s manifest ([apiVersion not set, kind not set]).
```
error validating data: [apiVersion not set, kind not set]
```
---
I'm afraid that it's sops's problem (at least partly), but anyhow this modification is enough harmless I think.
Thank you.
Signed-off-by: Takumi Sue <u630868b@alumni.osaka-u.ac.jp>
77add64860