From 346d6bb04c6dfcd6f5bc18e8c5e64fb29a3cb85e Mon Sep 17 00:00:00 2001
From: Andrew Lytvynov <awly@tailscale.com>
Date: Mon, 27 Apr 2026 09:13:30 -0700
Subject: [PATCH] util/sysresources: remove unused package (#19523)

Added a few years ago and appears to be unused.

Updates #cleanup

Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
---
 util/sysresources/memory.go             | 10 ----------
 util/sysresources/memory_bsd.go         | 16 ----------------
 util/sysresources/memory_darwin.go      | 16 ----------------
 util/sysresources/memory_linux.go       | 19 -------------------
 util/sysresources/memory_unsupported.go |  8 --------
 util/sysresources/sysresources.go       |  6 ------
 util/sysresources/sysresources_test.go  | 25 -------------------------
 7 files changed, 100 deletions(-)
 delete mode 100644 util/sysresources/memory.go
 delete mode 100644 util/sysresources/memory_bsd.go
 delete mode 100644 util/sysresources/memory_darwin.go
 delete mode 100644 util/sysresources/memory_linux.go
 delete mode 100644 util/sysresources/memory_unsupported.go
 delete mode 100644 util/sysresources/sysresources.go
 delete mode 100644 util/sysresources/sysresources_test.go

diff --git a/util/sysresources/memory.go b/util/sysresources/memory.go
deleted file mode 100644
index 3c6b9ae85..000000000
--- a/util/sysresources/memory.go
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright (c) Tailscale Inc & contributors
-// SPDX-License-Identifier: BSD-3-Clause
-
-package sysresources
-
-// TotalMemory returns the total accessible system memory, in bytes. If the
-// value cannot be determined, then 0 will be returned.
-func TotalMemory() uint64 {
-	return totalMemoryImpl()
-}
diff --git a/util/sysresources/memory_bsd.go b/util/sysresources/memory_bsd.go
deleted file mode 100644
index 945f86ea3..000000000
--- a/util/sysresources/memory_bsd.go
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) Tailscale Inc & contributors
-// SPDX-License-Identifier: BSD-3-Clause
-
-//go:build freebsd || openbsd || dragonfly || netbsd
-
-package sysresources
-
-import "golang.org/x/sys/unix"
-
-func totalMemoryImpl() uint64 {
-	val, err := unix.SysctlUint64("hw.physmem")
-	if err != nil {
-		return 0
-	}
-	return val
-}
diff --git a/util/sysresources/memory_darwin.go b/util/sysresources/memory_darwin.go
deleted file mode 100644
index 165f12eb3..000000000
--- a/util/sysresources/memory_darwin.go
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) Tailscale Inc & contributors
-// SPDX-License-Identifier: BSD-3-Clause
-
-//go:build darwin
-
-package sysresources
-
-import "golang.org/x/sys/unix"
-
-func totalMemoryImpl() uint64 {
-	val, err := unix.SysctlUint64("hw.memsize")
-	if err != nil {
-		return 0
-	}
-	return val
-}
diff --git a/util/sysresources/memory_linux.go b/util/sysresources/memory_linux.go
deleted file mode 100644
index 3885a8aa6..000000000
--- a/util/sysresources/memory_linux.go
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright (c) Tailscale Inc & contributors
-// SPDX-License-Identifier: BSD-3-Clause
-
-//go:build linux
-
-package sysresources
-
-import "golang.org/x/sys/unix"
-
-func totalMemoryImpl() uint64 {
-	var info unix.Sysinfo_t
-
-	if err := unix.Sysinfo(&info); err != nil {
-		return 0
-	}
-
-	// uint64 casts are required since these might be uint32s
-	return uint64(info.Totalram) * uint64(info.Unit)
-}
diff --git a/util/sysresources/memory_unsupported.go b/util/sysresources/memory_unsupported.go
deleted file mode 100644
index c88e9ed52..000000000
--- a/util/sysresources/memory_unsupported.go
+++ /dev/null
@@ -1,8 +0,0 @@
-// Copyright (c) Tailscale Inc & contributors
-// SPDX-License-Identifier: BSD-3-Clause
-
-//go:build !(linux || darwin || freebsd || openbsd || dragonfly || netbsd)
-
-package sysresources
-
-func totalMemoryImpl() uint64 { return 0 }
diff --git a/util/sysresources/sysresources.go b/util/sysresources/sysresources.go
deleted file mode 100644
index 33d0d5d96..000000000
--- a/util/sysresources/sysresources.go
+++ /dev/null
@@ -1,6 +0,0 @@
-// Copyright (c) Tailscale Inc & contributors
-// SPDX-License-Identifier: BSD-3-Clause
-
-// Package sysresources provides OS-independent methods of determining the
-// resources available to the current system.
-package sysresources
diff --git a/util/sysresources/sysresources_test.go b/util/sysresources/sysresources_test.go
deleted file mode 100644
index 7fea1bf0f..000000000
--- a/util/sysresources/sysresources_test.go
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright (c) Tailscale Inc & contributors
-// SPDX-License-Identifier: BSD-3-Clause
-
-package sysresources
-
-import (
-	"runtime"
-	"testing"
-)
-
-func TestTotalMemory(t *testing.T) {
-	switch runtime.GOOS {
-	case "linux":
-	case "freebsd", "openbsd", "dragonfly", "netbsd":
-	case "darwin":
-	default:
-		t.Skipf("not supported on runtime.GOOS=%q yet", runtime.GOOS)
-	}
-
-	mem := TotalMemory()
-	if mem == 0 {
-		t.Fatal("wanted TotalMemory > 0")
-	}
-	t.Logf("total memory: %v bytes", mem)
-}