ecfw: move flashing scripts to separate derivation

src/platform/kevin/default.nix

@@ -99,9 +99,10 @@ in {
 
       # built fromm source
       arm-none-eabi-gcc = final.nixpkgsOnBuildForBuild.pkgsCross.arm-embedded.buildPackages.gcc6;
+    };
 
-      inherit (final) ectool;
-
+    ecfw-scripts = final.nixpkgsOnBuildForHost.callPackage (import ./ecfw/scripts.nix) {
+      inherit (final) ectool ecfw;
       flashrom-chromebook = final.nixpkgsOnBuildForHost.callPackage ../../util/flashrom { forChromebook = true; };
     };
 

src/platform/kevin/ecfw/default.nix

@@ -11,8 +11,6 @@
 , ncurses
 , fetchgit
 , buildPackages
-, ectool
-, flashrom-chromebook
 }:
 
 let makeTarget = "build/${boardName}/ec.bin";
@@ -75,72 +73,11 @@ in stdenv.mkDerivation (finalAttrs: {
     makeTarget
   ];
 
-  flashEcRw = ''
-    #!/usr/bin/env bash
-    set -euo pipefail
-
-    echo
-    echo "rebooting EC into the RO image..."
-    ${ectool}/bin/ectool reboot_ec RO
-    ${ectool}/bin/ectool version | grep 'Firmware copy: RO'
-
-    echo
-    echo "enabling RO image write protect..."
-    ${ectool}/bin/ectool flashprotect enable | head -n1 | grep ro_now
-    ${flashrom-chromebook}/bin/flashrom-chromebook -p ec --wp-status | grep "write protect is enabled"
-
-    echo
-    echo "writing the RW image..."
-    ${flashrom-chromebook}/bin/flashrom-chromebook -p ec -i EC_RW -w ${placeholder "out"}/ecfw.bin
-    ${ectool}/bin/ectool version
-
-    echo
-    echo "rebooting into the new RW image..."
-    ${ectool}/bin/ectool reboot_ec RW
-    sleep 2
-    ${ectool}/bin/ectool version
-    ${ectool}/bin/ectool version | grep 'Firmware copy: RW'
-  '';
-
-  flashEcRo = ''
-    #!/usr/bin/env bash
-    set -euo pipefail
-
-    echo
-    echo "making sure you are in the RW image before flashing the RO..."
-    ${ectool}/bin/ectool version | grep 'Firmware copy: RW'
-
-    echo
-    echo "disabling RO image write protect..."
-    ${ectool}/bin/ectool flashprotect disable
-    ${flashrom-chromebook}/bin/flashrom-chromebook -p ec --wp-status | grep "write protect is disabled"
-
-    echo
-    echo "writing the RO image..."
-    ${flashrom-chromebook}/bin/flashrom-chromebook -p ec -i EC_RO -w ${placeholder "out"}/ecfw.bin
-    ${ectool}/bin/ectool version
-
-    echo
-    echo "rebooting into the new RO image..."
-    ${ectool}/bin/ectool reboot_ec RO
-    sleep 2
-    ${ectool}/bin/ectool version
-    ${ectool}/bin/ectool version | grep 'Firmware copy: RO'
-
-    echo
-    echo "re-enabling RO image write protect..."
-    ${ectool}/bin/ectool flashprotect enable
-    ${flashrom-chromebook}/bin/flashrom-chromebook -p ec --wp-status | grep "write protect is enabled"
-  '';
-
-  passAsFile = [ "getVersion" "flashEcRo" "flashEcRw" ];
+  passAsFile = [ "getVersion" ];
 
   installPhase = ''
     mkdir -p $out/bin
     mv ${makeTarget} $out/ecfw.bin
-    cp $flashEcRoPath $out/bin/flash-ec-ro.sh
-    cp $flashEcRwPath $out/bin/flash-ec-rw.sh
-    chmod +x $out/bin/flash-ec-ro.sh $out/bin/flash-ec-rw.sh
   '';
 
   meta = with lib; {

src/platform/kevin/ecfw/scripts.nix

@@ -0,0 +1,81 @@
+{ stdenv
+, lib
+, runtimeShell
+, ecfw
+, ectool
+, flashrom-chromebook
+}:
+
+stdenv.mkDerivation {
+  pname = "ecfw-scripts";
+  inherit (ecfw) version;
+
+  flashEcRw = ''
+    #!${runtimeShell}
+    set -euo pipefail
+
+    echo
+    echo "rebooting EC into the RO image..."
+    ${ectool}/bin/ectool reboot_ec RO
+    sleep 2
+    ${ectool}/bin/ectool version | grep 'Firmware copy: RO'
+
+    echo
+    echo "enabling RO image write protect..."
+    ${ectool}/bin/ectool flashprotect enable | head -n1 | grep ro_now
+    ${flashrom-chromebook}/bin/flashrom-chromebook -p ec --wp-status | grep "write protect is enabled"
+
+    echo
+    echo "writing the RW image..."
+    ${flashrom-chromebook}/bin/flashrom-chromebook -p ec -i EC_RW -w ${ecfw}/ecfw.bin
+    ${ectool}/bin/ectool version
+
+    echo
+    echo "rebooting into the new RW image..."
+    ${ectool}/bin/ectool reboot_ec RW
+    sleep 2
+    ${ectool}/bin/ectool version
+    ${ectool}/bin/ectool version | grep 'Firmware copy: RW'
+  '';
+
+  flashEcRo = ''
+    #!${runtimeShell}
+    set -euo pipefail
+
+    echo
+    echo "making sure you are in the RW image before flashing the RO..."
+    ${ectool}/bin/ectool version | grep 'Firmware copy: RW'
+
+    echo
+    echo "disabling RO image write protect..."
+    ${ectool}/bin/ectool flashprotect disable
+    ${flashrom-chromebook}/bin/flashrom-chromebook -p ec --wp-status | grep "write protect is disabled"
+
+    echo
+    echo "writing the RO image..."
+    ${flashrom-chromebook}/bin/flashrom-chromebook -p ec -i EC_RO -w ${ecfw}/ecfw.bin
+    ${ectool}/bin/ectool version
+
+    echo
+    echo "rebooting into the new RO image..."
+    ${ectool}/bin/ectool reboot_ec RO
+    sleep 2
+    ${ectool}/bin/ectool version
+    ${ectool}/bin/ectool version | grep 'Firmware copy: RO'
+
+    echo
+    echo "re-enabling RO image write protect..."
+    ${ectool}/bin/ectool flashprotect enable
+    ${flashrom-chromebook}/bin/flashrom-chromebook -p ec --wp-status | grep "write protect is enabled"
+  '';
+
+  dontUnpack = true;
+  dontBuild = true;
+  passAsFile = [ "flashEcRo" "flashEcRw" ];
+  installPhase = ''
+    mkdir -p $out/bin
+    cp $flashEcRoPath $out/bin/flash-ec-ro.sh
+    cp $flashEcRwPath $out/bin/flash-ec-rw.sh
+    chmod +x $out/bin/flash-ec-ro.sh $out/bin/flash-ec-rw.sh
+  '';
+}