make-initrd-ng: suppress spurious glibc dependency warnings (#508087)

pkgs/build-support/kernel/make-initrd-ng/src/main.rs

@@ -5,9 +5,7 @@ use std::fs;
 use std::hash::Hash;
 use std::iter::FromIterator;
 use std::os::unix;
-use std::os::unix::fs::PermissionsExt;
 use std::path::{Component, Path, PathBuf};
-use std::process::Command;
 
 use libc::umask;
 
@@ -159,13 +157,22 @@ fn add_dependencies<P: AsRef<Path> + AsRef<OsStr> + std::fmt::Debug>(
             }
         }
         if !found {
-            // glibc makes it tricky to make this an error because
-            // none of the files have a useful rpath.
-            println!(
-                "Warning: Couldn't satisfy dependency {} for {:?}",
-                line,
-                OsStr::new(&source)
-            );
+            // In Nix, glibc's own libraries lack rpath entries pointing to
+            // themselves, so the dynamic linker (ld-linux-*.so.*) and libc.so.*
+            // can never be resolved through rpath alone. They are always present
+            // in the initrd: the linker via elf.interpreter above, and libc via
+            // at least one binary's rpath. Suppress these known-benign cases.
+            // See also: the ld*.so.? skip in stage-1.nix findLibs.
+            let is_glibc_runtime = (line.starts_with("ld-") && line.contains(".so"))
+                || line.starts_with("libc.so");
+
+            if !is_glibc_runtime {
+                eprintln!(
+                    "Warning: Couldn't satisfy dependency {} for {:?}",
+                    line,
+                    OsStr::new(&source)
+                );
+            }
         }
     }