build: provide bpftool

Signed-off-by: Leonardo Di Donato <[email protected]>

tools/xmake.lua

@@ -0,0 +1,43 @@
+set_xmakever("2.6.1") -- Minimum version to compile BPF source correctly
+
+-- options
+option("require-bpftool", {showmenu = true, default = false, description = "require bpftool package"})
+
+--- run `xmake f --require-bpftool=y` to pull bpftool from xmake-repo repo rather than using the system one
+if has_config("require-bpftool") then
+    add_requires("linux-tools", {configs = {bpftool = true}})
+    add_packages("linux-tools")
+end
+
+-- bpftool
+local bpftool = path.join("tools", "bpftool")
+target("bpftool")
+    set_kind("phony")
+    on_config(function (target)
+        if os.tryrm(bpftool) then
+            if has_config("require-bpftool") then
+                local target = path.join(target:pkg("linux-tools"):installdir(), "sbin", "bpftool")
+                os.ln(target, bpftool)
+            else
+                import("lib.detect.find_program")
+                local sys_bpftool = find_program("bpftool")
+                if sys_bpftool == nil then
+                    os.raise("cannot find bpftool in system")
+                end
+                os.ln(sys_bpftool, bpftool)
+            end
+            import("core.base.option")
+            if option.get("verbose") then
+                import("core.base.json")
+                local vers = os.iorunv(bpftool, {"version", "-j"})
+                print(json.decode(vers))
+            end
+        end
+    end)
+    before_build(function(target)
+        import("utils.progress")
+        progress.show(10, "${color.build.object}providing.bpftool %s", bpftool)
+    end)
+    on_clean(function (target)
+        os.tryrm(bpftool)
+    end)