add a script to generate the sysroot
Example usage:
$ ./src/third_party/portage-prefix/setup_board --board bruteus
$ ./build/bruteus/build/bin/emerge android-base/zlib
BUG=b:20895978
Change-Id: I9a0d270e164703d775c69c570ac92976dad4f881
diff --git a/setup_board b/setup_board
new file mode 100755
index 0000000..2d93c2e
--- /dev/null
+++ b/setup_board
@@ -0,0 +1,136 @@
+#!/usr/bin/python
+# Copyright 2015 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Create the initial board build directory and config files."""
+
+from __future__ import print_function
+
+import argparse
+import logging
+import multiprocessing
+import os
+import sys
+
+
+def GetParser():
+ parser = argparse.ArgumentParser(description=__doc__)
+ parser.add_argument('--board', type=str, required=True,
+ help='The board to use')
+ return parser
+
+
+def main(argv):
+ parser = GetParser()
+ opts = parser.parse_args(argv)
+
+ source_root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(
+ os.path.realpath(__file__)))))
+
+ overlay = os.path.join(source_root, 'src', 'overlays', 'overlay-%s' % opts.board)
+ if not os.path.exists(overlay):
+ print('overaly does not exist: %s' % overlay)
+
+ sysroot = os.path.join(source_root, 'build', opts.board)
+ print('Setting up %s' % sysroot)
+
+ # Create /etc/portage/.
+ etc_portage = os.path.join(sysroot, 'etc', 'portage')
+ if not os.path.isdir(etc_portage):
+ os.makedirs(etc_portage)
+
+ # Create /etc/portage/make.profile.
+ target = os.path.relpath(os.path.join(overlay, 'profiles', 'base'),
+ etc_portage)
+ profile = os.path.join(etc_portage, 'make.profile')
+ if not os.path.islink(profile):
+ os.symlink(target, profile)
+
+ # Stub a few packages out.
+ profile = os.path.join(etc_portage, 'profile')
+ if not os.path.isdir(profile):
+ os.makedirs(profile)
+ conf = os.path.join(profile, 'package.provided')
+ with open(conf, 'w') as f:
+ f.write("""# AUTO GENERATED.
+# We use the git eclass which wants git to build things, but we don't actually
+# need it in the sysroot as it's a host tool. Stub it out.
+dev-vcs/git-2
+""")
+
+ # Used by generation below.
+ settings = {
+ 'source_root': source_root,
+ 'sysroot': sysroot,
+ 'overlay': overlay,
+ 'gprefix': os.path.join(source_root, 'src', 'third_party',
+ 'portage-prefix'),
+ 'ncpus': multiprocessing.cpu_count(),
+ }
+
+ # Create /etc/portage/make.conf.
+ conf = os.path.join(etc_portage, 'make.conf')
+ with open(conf, 'w') as f:
+ f.write("""# AUTO GENERATED.
+EPREFIX='/'
+SOURCE_ROOT="%(source_root)s"
+CHROOT_SOURCE_ROOT="${SOURCE_ROOT}"
+ANDROID_SOURCE="${SOURCE_ROOT}/android"
+GENTOO_PREFIX="%(gprefix)s"
+COMMON_BUILD="${SOURCE_ROOT}/build/portage"
+DISTDIR="${COMMON_BUILD}/distdir"
+ROOT="%(sysroot)s"
+PORTAGE_TMPDIR="${ROOT}/tmp"
+PORT_LOGDIR="${PORTAGE_TMPDIR}/logs"
+SYSROOT="%(sysroot)s"
+ROOTPATH="/usr/bin:/bin:/usr/sbin:/sbin:${GENTOO_PREFIX}/usr/bin"
+ARCH="amd64"
+BOARD_OVERLAY="%(overlay)s"
+BOARD_USE="bruteus"
+CHOST="x86_64-cros-linux-gnu"
+MAKEOPTS="-j%(ncpus)i"
+PKG_CONFIG="${SYSROOT}/build/bin/pkg-config"
+PORTDIR_OVERLAY="${SOURCE_ROOT}/src/third_party/eclass-overlay
+${SOURCE_ROOT}/src/third_party/portage-stable
+${SOURCE_ROOT}/src/third_party/chromiumos-overlay
+%(overlay)s"
+source "${BOARD_OVERLAY}/make.conf"
+PORTAGE_BUNZIP2_COMMAND="bzip2"
+FEATURES="-sandbox -usersandbox"
+EMERGE_DEFAULT_OPTS="--root-deps --quiet-build y --jobs %(ncpus)i"
+
+TC_GCC_BASE="${ANDROID_SOURCE}/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.15-4.8/bin"
+TC_CLANG_BASE="${ANDROID_SOURCE}/prebuilts/clang/linux-x86/host/3.6/bin"
+CC="${TC_CLANG_BASE}/clang"
+CXX="${CXX}++"
+AR="${TC_GCC_BASE}/x86_64-linux-ar"
+RANLIB="${TC_GCC_BASE}/x86_64-linux-ranlib"
+STRIP="${TC_GCC_BASE}/x86_64-linux-strip"
+
+CBUILD="x86_64-pc-linux-gnu"
+CHOST="x86_64-android-linux-gnu"
+""" % settings)
+
+ # Now a few bin wrappers.
+ bindir = os.path.join(sysroot, 'build', 'bin')
+ if not os.path.isdir(bindir):
+ os.makedirs(bindir)
+
+ for wrapper in ('ebuild', 'emerge', 'portageq'):
+ target = os.path.join(bindir, wrapper)
+ settings['wrapper'] = wrapper
+ with open(target, 'w') as f:
+ f.write("""#!/bin/sh
+PORTAGE_CONFIGROOT="%(sysroot)s" \
+ROOT="%(sysroot)s" \
+exec "%(gprefix)s/usr/bin/%(wrapper)s" "$@"
+""" % settings)
+ os.chmod(target, 0o755)
+
+ # Done!
+ print('You may now use the programs in %s' % bindir)
+
+
+if __name__ == '__main__':
+ sys.exit(main(sys.argv[1:]))
