Add nix derivation for static builds

Author: hswong3i

.gitignore

@@ -1,6 +1,7 @@
 *.1
 /layers-*
 /skopeo
+result
 
 # ignore JetBrains IDEs (GoLand) config folder
-.idea
+.idea

Makefile

@@ -62,6 +62,9 @@ CONTAINER_RUN := $(CONTAINER_CMD) "$(IMAGE)"
 
 GIT_COMMIT := $(shell git rev-parse HEAD 2> /dev/null || true)
 
+EXTRA_LDFLAGS ?=
+LDFLAGS := -ldflags '-X main.gitCommit=${GIT_COMMIT} $(EXTRA_LDFLAGS)'
+
 MANPAGES_MD = $(wildcard docs/*.md)
 MANPAGES ?= $(MANPAGES_MD:%.md=%)
 
@@ -85,7 +88,7 @@ help:
 	@echo
 	@echo " * 'install' - Install binaries and documents to system locations"
 	@echo " * 'binary' - Build skopeo with a container"
-	@echo " * 'binary-local' - Build skopeo locally"
+	@echo " * 'bin/skopeo' - Build skopeo locally"
 	@echo " * 'test-unit' - Execute unit tests"
 	@echo " * 'test-integration' - Execute integration tests"
 	@echo " * 'validate' - Verify whether there is no conflict and all Go source files have been formatted, linted and vetted"
@@ -98,19 +101,18 @@ help:
 binary: cmd/skopeo
 	${CONTAINER_RUNTIME} build ${BUILD_ARGS} -f Dockerfile.build -t skopeobuildimage .
 	${CONTAINER_RUNTIME} run --rm --security-opt label=disable -v $$(pwd):/src/github.com/containers/skopeo \
-		skopeobuildimage make binary-local $(if $(DEBUG),DEBUG=$(DEBUG)) BUILDTAGS='$(BUILDTAGS)'
+		skopeobuildimage make bin/skopeo $(if $(DEBUG),DEBUG=$(DEBUG)) BUILDTAGS='$(BUILDTAGS)'
 
-binary-static: cmd/skopeo
-	${CONTAINER_RUNTIME} build ${BUILD_ARGS} -f Dockerfile.build -t skopeobuildimage .
-	${CONTAINER_RUNTIME} run --rm --security-opt label=disable -v $$(pwd):/src/github.com/containers/skopeo \
-		skopeobuildimage make binary-local-static $(if $(DEBUG),DEBUG=$(DEBUG)) BUILDTAGS='$(BUILDTAGS)'
+# Update nix/nixpkgs.json its latest master commit
+.PHONY: nixpkgs
+nixpkgs:
+	@nix run -f channel:nixpkgs-unstable nix-prefetch-git -c nix-prefetch-git \
+		--no-deepClone https://github.com/nixos/nixpkgs > nix/nixpkgs.json
 
 # Build w/o using containers
-binary-local:
-	$(GPGME_ENV) $(GO) build $(MOD_VENDOR) ${GO_DYN_FLAGS} -ldflags "-X main.gitCommit=${GIT_COMMIT}" -gcflags "$(GOGCFLAGS)" -tags "$(BUILDTAGS)" -o skopeo ./cmd/skopeo
-
-binary-local-static:
-	$(GPGME_ENV) $(GO) build $(MOD_VENDOR) -ldflags "-extldflags \"-static\" -X main.gitCommit=${GIT_COMMIT}" -gcflags "$(GOGCFLAGS)" -tags "$(BUILDTAGS)" -o skopeo ./cmd/skopeo
+.PHONY: bin/skopeo
+bin/skopeo:
+	$(GPGME_ENV) $(GO) build $(MOD_VENDOR) ${GO_DYN_FLAGS} ${LDFLAGS} -gcflags "$(GOGCFLAGS)" -tags "$(BUILDTAGS)" -o $@ ./cmd/skopeo
 
 build-container:
 	${CONTAINER_RUNTIME} build ${BUILD_ARGS} -t "$(IMAGE)" .

nix/default.nix

@@ -0,0 +1,43 @@
+{ system ? builtins.currentSystem }:
+let
+  pkgs = (import ./nixpkgs.nix {
+    config = {
+      packageOverrides = pkg: {
+        gpgme = (static pkg.gpgme);
+        libassuan = (static pkg.libassuan);
+        libgpgerror = (static pkg.libgpgerror);
+      };
+    };
+  });
+
+  static = pkg: pkg.overrideAttrs(x: {
+    configureFlags = (x.configureFlags or []) ++
+      [ "--without-shared" "--disable-shared" ];
+    dontDisableStatic = true;
+    enableSharedExecutables = false;
+    enableStatic = true;
+  });
+
+  self = with pkgs; buildGoPackage rec {
+    name = "skopeo";
+    src = ./..;
+    goPackagePath = "github.com/containers/skopeo";
+    doCheck = false;
+    enableParallelBuilding = true;
+    nativeBuildInputs = [ git go-md2man installShellFiles makeWrapper pkg-config ];
+    buildInputs = [ glibc glibc.static gpgme libassuan libgpgerror ];
+    prePatch = ''
+      export LDFLAGS='-static-libgcc -static -s -w'
+      export EXTRA_LDFLAGS='-s -w -linkmode external -extldflags "-static -lm"'
+      export BUILDTAGS='static netgo exclude_graphdriver_btrfs exclude_graphdriver_devicemapper'
+    '';
+    buildPhase = ''
+      pushd go/src/${goPackagePath}
+      patchShebangs .
+      make bin/skopeo
+    '';
+    installPhase = ''
+      install -Dm755 bin/skopeo $out/bin/skopeo
+    '';
+  };
+in self

nix/nixpkgs.json

@@ -0,0 +1,10 @@
+{
+  "url": "https://github.com/nixos/nixpkgs",
+  "rev": "0f114432d4a9399e0b225d5be1599c7ebc5e2772",
+  "date": "2020-05-29T19:54:08-05:00",
+  "path": "/nix/store/ds31sjj3ppsk0xclkficx9p3w6qslmdc-nixpkgs",
+  "sha256": "1qd2dlc5dk98y0xdahv9k72ibv5dsy10jg25xqvj38sadxbs3g0j",
+  "fetchSubmodules": false,
+  "deepClone": false,
+  "leaveDotGit": false
+}

nix/nixpkgs.nix

@@ -0,0 +1,8 @@
+let
+  json = builtins.fromJSON (builtins.readFile ./nixpkgs.json);
+  nixpkgs = import (builtins.fetchTarball {
+    name = "nixos-unstable";
+    url = "${json.url}/archive/${json.rev}.tar.gz";
+    inherit (json) sha256;
+  });
+in nixpkgs