bpftools: build bpf_asm, bpf_dbg

I needed some other bpf-related tools located in the kernel source tree,
so I hijacked the bpftool package, renamed it to bpftools and added
those programs.

pkgs/os-specific/linux/bpftool/default.nix

@@ -1,30 +0,0 @@
-{ lib, stdenv
-, libopcodes, libbfd, libelf
-, linuxPackages_latest, zlib
-, python3
-}:
-
-stdenv.mkDerivation {
-  pname = "bpftool";
-  inherit (linuxPackages_latest.kernel) version src;
-
-  nativeBuildInputs = [ python3 ];
-  buildInputs = [ libopcodes libbfd libelf zlib ];
-
-  preConfigure = ''
-    patchShebangs scripts/bpf_helpers_doc.py
-
-    cd tools/bpf/bpftool
-    substituteInPlace ./Makefile \
-      --replace '/usr/local' "$out" \
-      --replace '/usr'       "$out" \
-      --replace '/sbin'      '/bin'
-  '';
-
-  meta = with lib; {
-    description = "Debugging/program analysis tool for the eBPF subsystem";
-    license     = [ licenses.gpl2 licenses.bsd2 ];
-    platforms   = platforms.linux;
-    maintainers = with maintainers; [ thoughtpolice ];
-  };
-}

pkgs/os-specific/linux/bpftools/default.nix

@@ -0,0 +1,38 @@
+{ lib, stdenv
+, libopcodes, libbfd, libelf, readline
+, linuxPackages_latest, zlib
+, python3, bison, flex
+}:
+
+stdenv.mkDerivation {
+  pname = "bpftools";
+  inherit (linuxPackages_latest.kernel) version src;
+
+  nativeBuildInputs = [ python3 bison flex ];
+  buildInputs = [ libopcodes libbfd libelf zlib readline ];
+
+  preConfigure = ''
+    patchShebangs scripts/bpf_helpers_doc.py
+
+    cd tools/bpf
+    substituteInPlace ./bpftool/Makefile \
+      --replace '/usr/local' "$out" \
+      --replace '/usr'       "$out" \
+      --replace '/sbin'      '/bin'
+  '';
+
+  buildFlags = [ "bpftool" "bpf_asm" "bpf_dbg" ];
+
+  installPhase = ''
+    make -C bpftool install
+    install -Dm755 -t $out/bin bpf_asm
+    install -Dm755 -t $out/bin bpf_dbg
+  '';
+
+  meta = with lib; {
+    description = "Debugging/program analysis tools for the eBPF subsystem";
+    license     = [ licenses.gpl2 licenses.bsd2 ];
+    platforms   = platforms.linux;
+    maintainers = with maintainers; [ thoughtpolice ];
+  };
+}

pkgs/top-level/aliases.nix

@@ -70,6 +70,7 @@ mapAliases ({
   bazaarTools = throw "bazaar has been deprecated by breezy."; # added 2020-04-19
   beegfs = throw "beegfs has been removed."; # added 2019-11-24
   bluezFull = bluez; # Added 2019-12-03
+  bpftool = bpftools; # Added 2021-05-03
   brackets = throw "brackets has been removed, it was unmaintained and had open vulnerabilities"; # added 2021-01-24
   bridge_utils = bridge-utils;  # added 2015-02-20
   bro = zeek; # added 2019-09-29

pkgs/top-level/all-packages.nix

@@ -12536,7 +12536,7 @@ in
 
   libbpf = callPackage ../os-specific/linux/libbpf { };
 
-  bpftool = callPackage ../os-specific/linux/bpftool { };
+  bpftools = callPackage ../os-specific/linux/bpftools { };
 
   bpm-tools = callPackage ../tools/audio/bpm-tools { };