Add nix2appimage.sh script.

appdir.nix

@@ -0,0 +1,55 @@
+{ stdenv, fetchurl, perl, pathsFromGraph }:
+
+let
+  AppRun = fetchurl {
+    url = "https://github.com/probonopd/AppImageKit/releases/download/6/AppRun_6-x86_64";
+    sha256 = "1i0hr4ag6jz3h27c80ir2rswq91khw0cq9fqylg23l6pmjgwbf98";
+  };
+
+in
+
+  { target, name }: stdenv.mkDerivation {
+    name = "${name}.AppDir";
+    exportReferencesGraph = map (x: [("closure-" + baseNameOf x) x]) [ target ];
+    nativeBuildInputs = [ perl ];
+    buildCommand = ''
+      # TODO use symlinks to shrink output size
+
+      if [ ! -d ${target}/share/applications ]; then
+        echo "--------------------------------------------------"
+        echo "| /share/applications does not exist.            |"
+        echo "| AppImage only works with 'applications'.       |"
+        echo "| Try using nix-bundle.sh for command-line apps. |"
+        echo "--------------------------------------------------"
+        exit 1
+      fi
+
+      storePaths=$(${perl}/bin/perl ${pathsFromGraph} ./closure-*)
+      mkdir -p $out/nix/store
+      cp -r $storePaths $out/nix/store
+
+      cd $out
+
+      ln -s .${target} $out/usr
+
+      # .desktop
+      if [ -d ${target}/share/applications ]; then
+        desktop=$(find ${target}/share/applications -name "*.desktop" | head -n1)
+        if ! [ -z "$desktop" ]; then
+          ln -s .$desktop $out
+        fi
+      fi
+
+      # icons
+      if [ -d ${target}/share/icons ]; then
+        icon=$(find ${target}/share/icons -name "${name}.png" | head -n1)
+        if ! [ -z "$icon" ]; then
+          ln -s .$icon $out
+          ln -s .$icon .DirIcon
+        fi
+      fi
+
+      cp ${AppRun} AppRun
+      chmod a+x AppRun
+    '';
+  }

appimage.nix

@@ -0,0 +1,10 @@
+{ stdenv, appimagetool }:
+dir:
+
+stdenv.mkDerivation {
+  name = "appimage.AppImage";
+  buildInputs = [ appimagetool ];
+  buildCommand = ''
+    appimagetool ${dir} $out
+  '';
+}

appimagetool.nix

@@ -0,0 +1,29 @@
+{ stdenv, fetchurl }:
+
+# This is from some binaries.
+
+# Ideally, this should be source based,
+# but I can't get it to build from GitHub
+
+stdenv.mkDerivation rec {
+  name = "appimagekit";
+
+  src = fetchurl {
+    url = "https://github.com/probonopd/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage";
+    sha256 = "0l3hxp169dpyj3h38q9nsnh1cynam1j5zx8q362p93448rhm7d0y";
+  };
+
+  sourceRoot = "squashfs-root";
+
+  unpackPhase = ''
+    chmod a+x $src
+    $src --appimage-extract
+  '';
+
+  installPhase = ''
+    mkdir -p $out
+    cp -r usr/* $out
+  '';
+
+  dontPatchELF = true;
+}

default.nix

@@ -22,4 +22,11 @@ rec {
     inherit nix-user-chroot makebootstrap;
   };
 
+  appimagetool = callPackage ./appimagetool.nix {};
+
+  appimage = callPackage ./appimage.nix {
+    inherit appimagetool;
+  };
+
+  appdir = callPackage ./appdir.nix {};
 }

nix2appimage.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env sh
+
+if [ "$#" -lt 1 ]; then
+    cat <<EOF
+
+Usage: $0 TARGET
+
+Create a single-file bundle from the nixpkgs attribute "TARGET".
+
+For example:
+
+$ $0 emacs
+$ ./emacs
+
+EOF
+
+    exit 1
+fi
+
+target="$1"
+
+expr="with import <nixpkgs> {}; with import ./. {}; appimage (appdir { name = \"$target\"; target = $target; })"
+
+out=$(nix-store --no-gc-warning -r $(nix-instantiate --no-gc-warning -E "$expr"))
+
+cp -f $out $target