usystem: Add copy-system

Add copy-system, a simple script that copies whatever is system-y in the
current sysroot and sets up a valid sysroot on the destination. Meant to
be used as a quick way to install an Onyx system.

Signed-off-by: Pedro Falcato <[email protected]>

usystem/core/BUILD.gn

@@ -1,12 +1,13 @@
 group("core") {
-    deps = [
-        "devmgr",
-        "init",
-        "toybox",
-        "utils",
-        "coredumpd",
-        "bootstrap-init",
-        "flamegraph",
-        "trace"
-    ]
+  deps = [
+    "bootstrap-init",
+    "copy-system",
+    "coredumpd",
+    "devmgr",
+    "flamegraph",
+    "init",
+    "toybox",
+    "trace",
+    "utils",
+  ]
 }

usystem/core/copy-system/BUILD.gn

@@ -0,0 +1,10 @@
+import("//build/package.gni")
+
+resource("copysys-script") {
+  sources = [ "copy-system" ]
+  outputs = [ "sbin/{{source_file_part}}" ]
+}
+
+package("copy-system") {
+  deps = [ ":copysys-script" ]
+}

usystem/core/copy-system/copy-system

@@ -0,0 +1,23 @@
+#!/bin/sh
+set -e
+dest=$1
+if [ -z $dest ]; then
+    echo "Please specify the destination."
+    exit 1
+fi
+
+cp -r /usr $dest
+cp -r /sbin $dest
+cp -r /boot $dest
+cp -r /etc $dest
+mkdir $dest/root
+mkdir $dest/home
+mkdir $dest/dev
+mkdir $dest/proc
+mkdir $dest/var
+mkdir $dest/mnt
+mkdir $dest/sys
+mkdir $dest/tmp
+ln -sf usr/lib $dest/lib
+ln -sf usr/bin $dest/bin
+mount -t devfs none $dest/dev