Fix raw HTML directory listing output when using --query flag

[Copilot]

When --query is used, the kubelet can return an HTML directory listing instead of log content. Two bugs caused this to render as raw HTML rather than a clean file list.

Bugs fixed

• Raw mode bypassed HTML parsing: --query sets raw=true, routing responses through optionallyDecompress → io.Copy, which blindly copies any HTML directory listing to stdout. Fixed by peeking at the response in the raw path — if it starts with <pre>, route to outputDirectoryEntriesOrContent instead.

• Regex didn't match new kubelet format: The original regex href="([^"]+)" only matched the old <a href="name/">name/</a> link style. Kubernetes 1.28+ kubelet returns <a>name/</a> (no href), so no entries were ever extracted. Changed to <a[^>]*>([^<]+)</a> to capture tag text content regardless of attributes.

Before (--query=messages on a node where the kubelet returns a directory listing):

<pre>
<a>amazon/</a>
<a>audit/</a>
<a>messages</a>
</pre>

After:

amazon/
audit/
messages

Refactor

Extracted writeToReader(out io.Writer, in io.Reader) from writeTo to make the core dispatch logic unit-testable without a live API server. Added tests covering old-href HTML, no-href HTML, prefix handling, plain-text passthrough, and raw-mode HTML detection.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Weird output of the plugin?</issue_title>
<issue_description>Hello,

This is what I get:

k node-logs ip-10-120-149-23.ec2.internal --query=messages
<pre>
<a href="amazon/">amazon/</a>
<a href="audit/">audit/</a>
<a href="aws-routed-eni/">aws-routed-eni/</a>
<a href="boot.log">boot.log</a>
<a href="btmp">btmp</a>
<a href="btmp-20240401.gz">btmp-20240401.gz</a>
<a href="chrony/">chrony/</a>
<a href="cloud-init-output.log">cloud-init-output.log</a>
<a href="cloud-init.log">cloud-init.log</a>
<a href="containers/">containers/</a>
<a href="cron">cron</a>
<a href="dmesg">dmesg</a>
<a href="dmesg.old">dmesg.old</a>
<a href="grubby">grubby</a>
<a href="grubby_prune_debug">grubby_prune_debug</a>
<a href="journal/">journal/</a>
<a href="lastlog">lastlog</a>
<a href="maillog">maillog</a>
<a href="messages">messages</a>
<a href="pods/">pods/</a>
<a href="secure">secure</a>
<a href="spooler">spooler</a>
<a href="tallylog">tallylog</a>
<a href="wtmp">wtmp</a>
<a href="yum.log">yum.log</a>
</pre>

• aws eks 1.28
• kubectl 1.28
• latest node-logs plugin</issue_description>

Comments on the Issue (you are @copilot in this section)

@aravindhp Thanks for opening the issue. It is a bug with listing the directories. I will take a look when I have some cycles.

BTW, viewing a file like yum.log should work.</comment_new>

• Fixes Weird output of the plugin? #1

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[aravindhp]

@jrvaldes please review and test this against an OpenShift cluster when you have the chance.