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#!/usr/bin/env python3
import os
import sys
def bail(msg):
print(msg, file=sys.stderr)
sys.exit(1)
_MARKER = '@@'
def transform_line(line):
# Substitute any special markers of this form:
# @@ENV@@
# with the value of ENV, split into meson array syntax.
start = line.find(_MARKER)
if start == -1:
return line
end = line.rfind(_MARKER)
if end == start:
return line
# Lookup value of the env var.
var = line[start+len(_MARKER):end]
try:
val = os.environ[var]
except KeyError:
bail('cannot generate meson.cross; env var %s not set' % var)
# Transform into meson array.
val = ["'%s'" % x for x in val.split()]
val = ', '.join(val)
val = '[%s]' % val
before = line[:start]
after = line[end+len(_MARKER):]
return '%s%s%s' % (before, val, after)
# Make sure this is really an SDK extraction environment.
try:
sysroot = os.environ['OECORE_NATIVE_SYSROOT']
except KeyError:
bail('OECORE_NATIVE_SYSROOT env var must be set')
cross_file = os.path.join(sysroot, 'usr/share/meson/meson.cross')
tmp_cross_file = '%s.tmp' % cross_file
# Read through and transform the current meson.cross.
lines = []
with open(cross_file, 'r') as f:
for line in f:
lines.append(transform_line(line))
# Write the transformed result to a tmp file and atomically rename it. In case
# we crash during the file write, we don't want an invalid meson.cross file.
with open(tmp_cross_file, 'w') as f:
for line in lines:
f.write(line)
f.flush()
os.fdatasync(f.fileno())
os.rename(tmp_cross_file, cross_file)
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