[PATCH proxmox-datacenter-manager v3] fix #7187: report: add ethtool output for physical interfaces

[Erik Fastermann <e.fastermann@proxmox.com>]

Adding ethtool output to the report provides visibility into actual and
supported NIC link speeds, making it much easier to diagnose network
performance issues, negotiation failures, and configuration mismatches.
It also reduces support back-and-forth.

The implementation mirrors the change in proxmox-backup, as the report
functionality in pdm is adapted from there.

Signed-off-by: Erik Fastermann <e.fastermann@proxmox.com>
---

 NOTE: A similar patch was submitted for all products:
 pmg, pve, pbs, pdm.

 changes since v2:
 * added new function dynamic_commands
 * updated generate_report to include the dynamic_commands
   NOTE: I did not change the signature of get_command_output, as the suggested
   fix does not work in this case, because we later join the args for the
   output. This is why solutions like &[impl AsRef<OsStr>] also don't work.
   Mapping the Vec<String> to Vec<&str> seamed like the simplest change, but I'm
   open to other suggestions.

 server/src/report.rs | 35 ++++++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)

diff --git a/server/src/report.rs b/server/src/report.rs
index 371d8cf..3c87b99 100644
--- a/server/src/report.rs
+++ b/server/src/report.rs
@@ -2,6 +2,8 @@ use std::fmt::Write;
 use std::path::Path;
 use std::process::Command;
 
+use proxmox_network_api::NetworkInterfaceType;
+
 // TODO: This was copied from PBS. Might make sense to refactor these a little
 // bit and move them a `proxmox-system-report` crate or something.
 
@@ -84,6 +86,25 @@ fn commands() -> Vec<(&'static str, Vec<&'static str>)> {
     ]
 }
 
+fn dynamic_commands() -> Vec<(&'static str, Vec<String>)> {
+    let mut commands = Vec::new();
+
+    match proxmox_network_api::config() {
+        Ok((config, _)) => {
+            for (name, iface) in config.interfaces {
+                if iface.interface_type == NetworkInterfaceType::Eth {
+                    commands.push(("ethtool", vec![name]));
+                }
+            }
+        }
+        Err(err) => {
+            eprintln!("failed to query network interfaces: {err}");
+        }
+    }
+
+    commands
+}
+
 // (description, function())
 type FunctionMapping = (&'static str, fn() -> String);
 
@@ -183,9 +204,17 @@ pub fn generate_report() -> String {
         .collect::<Vec<String>>()
         .join("\n\n");
 
-    let command_outputs = commands()
-        .iter()
-        .map(|(command, args)| get_command_output(command, args))
+    let static_command_outputs = commands()
+        .into_iter()
+        .map(|(command, args)| get_command_output(command, &args));
+
+    let dynamic_command_outputs = dynamic_commands().into_iter().map(|(command, args)| {
+        let args = args.iter().map(String::as_str).collect();
+        get_command_output(command, &args)
+    });
+
+    let command_outputs = static_command_outputs
+        .chain(dynamic_command_outputs)
         .collect::<Vec<String>>()
         .join("\n\n");
 
-- 
2.47.3