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# Copyright (C) 2012 Linux Foundation
# Author: Richard Purdie
# Some code and influence taken from srctree.bbclass:
# Copyright (C) 2009 Chris Larson <clarson@kergoth.com>
# Released under the MIT license (see COPYING.MIT for the terms)
#
# externalsrc.bbclass enables use of an existing source tree, usually external to
# the build system to build a piece of software rather than the usual fetch/unpack/patch
# process.
#
# To use, add externalsrc to the global inherit and set EXTERNALSRC to point at the
# directory you want to use containing the sources e.g. from local.conf for a recipe
# called "myrecipe" you would do:
#
# INHERIT += "externalsrc"
# EXTERNALSRC_pn-myrecipe = "/path/to/my/source/tree"
#
# In order to make this class work for both target and native versions (or with
# multilibs/cross or other BBCLASSEXTEND variants), B is set to point to a separate
# directory under the work directory (split source and build directories). This is
# the default, but the build directory can be set to the source directory if
# circumstances dictate by setting EXTERNALSRC_BUILD to the same value, e.g.:
#
# EXTERNALSRC_BUILD_pn-myrecipe = "/path/to/my/source/tree"
#
SRCTREECOVEREDTASKS ?= "do_patch do_unpack do_fetch"
EXTERNALSRC_SYMLINKS ?= "oe-workdir:${WORKDIR} oe-logs:${T}"
python () {
externalsrc = d.getVar('EXTERNALSRC', True)
if externalsrc:
d.setVar('S', externalsrc)
externalsrcbuild = d.getVar('EXTERNALSRC_BUILD', True)
if externalsrcbuild:
d.setVar('B', externalsrcbuild)
else:
d.setVar('B', '${WORKDIR}/${BPN}-${PV}/')
local_srcuri = []
fetch = bb.fetch2.Fetch((d.getVar('SRC_URI', True) or '').split(), d)
for url in fetch.urls:
url_data = fetch.ud[url]
parm = url_data.parm
if (url_data.type == 'file' or
'type' in parm and parm['type'] == 'kmeta'):
local_srcuri.append(url)
d.setVar('SRC_URI', ' '.join(local_srcuri))
if '{SRCPV}' in d.getVar('PV', False):
# Dummy value because the default function can't be called with blank SRC_URI
d.setVar('SRCPV', '999')
tasks = filter(lambda k: d.getVarFlag(k, "task", True), d.keys())
for task in tasks:
if task.endswith("_setscene"):
# sstate is never going to work for external source trees, disable it
bb.build.deltask(task, d)
else:
# Since configure will likely touch ${S}, ensure only we lock so one task has access at a time
d.appendVarFlag(task, "lockfiles", " ${S}/singletask.lock")
# We do not want our source to be wiped out, ever (kernel.bbclass does this for do_clean)
cleandirs = (d.getVarFlag(task, 'cleandirs', False) or '').split()
setvalue = False
for cleandir in cleandirs[:]:
if d.expand(cleandir) == externalsrc:
cleandirs.remove(cleandir)
setvalue = True
if setvalue:
d.setVarFlag(task, 'cleandirs', ' '.join(cleandirs))
fetch_tasks = ['do_fetch', 'do_unpack']
# If we deltask do_patch, there's no dependency to ensure do_unpack gets run, so add one
# Note that we cannot use d.appendVarFlag() here because deps is expected to be a list object, not a string
d.setVarFlag('do_configure', 'deps', (d.getVarFlag('do_configure', 'deps', False) or []) + ['do_unpack'])
for task in d.getVar("SRCTREECOVEREDTASKS", True).split():
if local_srcuri and task in fetch_tasks:
continue
bb.build.deltask(task, d)
d.prependVarFlag('do_compile', 'prefuncs', "externalsrc_compile_prefunc ")
d.prependVarFlag('do_configure', 'prefuncs', "externalsrc_configure_prefunc ")
# Force the recipe to be always re-parsed so that the file_checksums
# function is run every time
d.setVar('BB_DONT_CACHE', '1')
d.setVarFlag('do_compile', 'file-checksums', '${@srctree_hash_files(d)}')
# We don't want the workdir to go away
d.appendVar('RM_WORK_EXCLUDE', ' ' + d.getVar('PN', True))
# If B=S the same builddir is used even for different architectures.
# Thus, use a shared CONFIGURESTAMPFILE and STAMP directory so that
# change of do_configure task hash is correctly detected and stamps are
# invalidated if e.g. MACHINE changes.
if d.getVar('S', True) == d.getVar('B', True):
configstamp = '${TMPDIR}/work-shared/${PN}/${EXTENDPE}${PV}-${PR}/configure.sstate'
d.setVar('CONFIGURESTAMPFILE', configstamp)
d.setVar('STAMP', '${STAMPS_DIR}/work-shared/${PN}/${EXTENDPE}${PV}-${PR}')
}
python externalsrc_configure_prefunc() {
# Create desired symlinks
symlinks = (d.getVar('EXTERNALSRC_SYMLINKS', True) or '').split()
for symlink in symlinks:
symsplit = symlink.split(':', 1)
lnkfile = os.path.join(d.getVar('S', True), symsplit[0])
target = d.expand(symsplit[1])
if len(symsplit) > 1:
if os.path.islink(lnkfile):
# Link already exists, leave it if it points to the right location already
if os.readlink(lnkfile) == target:
continue
os.unlink(lnkfile)
elif os.path.exists(lnkfile):
# File/dir exists with same name as link, just leave it alone
continue
os.symlink(target, lnkfile)
}
python externalsrc_compile_prefunc() {
# Make it obvious that this is happening, since forgetting about it could lead to much confusion
bb.plain('NOTE: %s: compiling from external source tree %s' % (d.getVar('PN', True), d.getVar('EXTERNALSRC', True)))
}
def srctree_hash_files(d):
import shutil
import subprocess
import tempfile
s_dir = d.getVar('EXTERNALSRC', True)
git_dir = os.path.join(s_dir, '.git')
oe_hash_file = os.path.join(git_dir, 'oe-devtool-tree-sha1')
ret = " "
if os.path.exists(git_dir):
with tempfile.NamedTemporaryFile(dir=git_dir, prefix='oe-devtool-index') as tmp_index:
# Clone index
shutil.copy2(os.path.join(git_dir, 'index'), tmp_index.name)
# Update our custom index
env = os.environ.copy()
env['GIT_INDEX_FILE'] = tmp_index.name
subprocess.check_output(['git', 'add', '.'], cwd=s_dir, env=env)
sha1 = subprocess.check_output(['git', 'write-tree'], cwd=s_dir, env=env)
with open(oe_hash_file, 'w') as fobj:
fobj.write(sha1)
ret = oe_hash_file + ':True'
else:
ret = d.getVar('EXTERNALSRC', True) + '/*:True'
return ret
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