kargs: Add more logging + debugging

I thought there was a bug in this code; there wasn't, but
this helped me verify that.

Signed-off-by: Colin Walters <walters@verbum.org>

lib/src/kargs.rs

@@ -9,6 +9,7 @@ use ostree_ext::prelude::FileExt;
 use serde::Deserialize;
 
 use crate::deploy::ImageState;
+use crate::journal;
 
 #[derive(Deserialize)]
 #[serde(rename_all = "kebab-case", deny_unknown_fields)]
@@ -36,16 +37,26 @@ pub(crate) fn get_kargs(
             let mut options: Vec<String> = options.into_iter().map(|s| s.to_string()).collect();
             kargs.append(&mut options);
         }
+        tracing::debug!("Current base kargs: {kargs:?}");
     };
 
     // Get the kargs in kargs.d of the booted system
+    let mut source_kargs_files = Vec::new();
     let mut existing_kargs: Vec<String> = vec![];
     let fragments = liboverdrop::scan(&["/usr/lib"], "bootc/kargs.d", &["toml"], true);
-    for (_name, path) in fragments {
+    for (name, path) in fragments {
+        let name = name
+            .to_str()
+            .ok_or_else(|| anyhow::anyhow!("Invalid utf8: {name:?}"))?;
+        source_kargs_files.push(name.to_owned());
         let s = std::fs::read_to_string(&path)?;
         let mut parsed_kargs = parse_file(s.clone(), sys_arch.clone())?;
         existing_kargs.append(&mut parsed_kargs);
     }
+    journal::journal_print(
+        libsystemd::logging::Priority::Info,
+        &format!("Source kargs from: {source_kargs_files:?}"),
+    );
 
     // Get the kargs in kargs.d of the pending image
     let mut remote_kargs: Vec<String> = vec![];
@@ -57,11 +68,13 @@ pub(crate) fn get_kargs(
     if !fetched_tree.query_exists(cancellable) {
         // if the kargs.d directory does not exist in the fetched image, return the existing kargs
         kargs.append(&mut existing_kargs);
+        tracing::debug!("No kargs.d in staged image");
         return Ok(kargs);
     }
     let queryattrs = "standard::name,standard::type";
     let queryflags = gio::FileQueryInfoFlags::NOFOLLOW_SYMLINKS;
     let fetched_iter = fetched_tree.enumerate_children(queryattrs, queryflags, cancellable)?;
+    let mut applied_kargs_files = Vec::new();
     while let Some(fetched_info) = fetched_iter.next_file(cancellable)? {
         // only read and parse the file if it is a toml file
         let name = fetched_info.name();
@@ -81,6 +94,7 @@ pub(crate) fn get_kargs(
                 let s = std::io::read_to_string(&mut reader)?;
                 let mut parsed_kargs = parse_file(s.clone(), sys_arch.clone())?;
                 remote_kargs.append(&mut parsed_kargs);
+                applied_kargs_files.push(name.to_owned());
             }
         }
     }
@@ -97,6 +111,10 @@ pub(crate) fn get_kargs(
         .filter(|item| !remote_kargs.contains(item))
         .collect();
 
+    journal::journal_print(
+        libsystemd::logging::Priority::Info,
+        &format!("Applied kargs from: {applied_kargs_files:?}"),
+    );
     tracing::debug!(
         "kargs: added={:?} removed={:?}",
         &added_kargs,