jcbrill
commented
3 years ago Code snippets for vswhere to json and processing json output in https://github.com/SCons/scons/issues/3988#issuecomment-961439844.
Sample vswhere to json functions:
# logical placement is in vc.py after msvc_find_vswhere
def vswhere_query_json(vswhere_args, env=None):
""" Find MSVC instances using the vswhere program.
Args:
vswhere_args: query arguments passed to vswhere
env: optional to look up VSWHERE variable
Returns:
json output or None
"""
if env is None or not env.get('VSWHERE'):
vswhere_path = msvc_find_vswhere()
else:
vswhere_path = env.subst('$VSWHERE')
if vswhere_path is None:
debug("vswhere path not found")
return None
debug('VSWHERE = %s' % vswhere_path)
vswhere_cmd = [vswhere_path] + vswhere_args + ['-format', 'json']
debug("running: %s" % vswhere_cmd)
#cp = subprocess.run(vswhere_cmd, capture_output=True) # 3.7+ only
cp = subprocess.run(vswhere_cmd, stdout=PIPE, stderr=PIPE)
if not cp.stdout:
debug("no vswhere information returned")
return None
vswhere_output = cp.stdout.decode("mbcs")
if not vswhere_output:
debug("no vswhere information output")
return None
try:
vswhere_json = json.loads(vswhere_output)
except json.decoder.JSONDecodeError:
debug("json decode exception loading vswhere output")
vswhere_json = None
return vswhere_json
# alternate version from WIP stand-alone script that used utf-8 encoding
# that takes as input a list of queries and returns a list of json output
@classmethod
def vswhere_query_json(cls, vswhere_queries):
vswhere_exe = cls._vswhere_executable()
if not vswhere_exe:
debug("vswhere path not found")
return None
vswhere_output = []
for vswhere_args in vswhere_queries:
vswhere_cmd = [vswhere_exe] + vswhere_args + ['-format', 'json', '-utf8']
vswhere_out = _VSDetectEnvironment.subprocess_run(vswhere_cmd, encoding='utf8', errors='strict')
if not vswhere_out:
debug("no vswhere information output")
continue
try:
vswhere_json = json.loads(vswhere_out)
except json.decoder.JSONDecodeError:
# JCB internal error?
debug("json decode exception loading vswhere output")
continue
vswhere_output.extend(vswhere_json)
return vswhere_outputfragment: vswhere_json.txt
mwichmann
bdbaddog
LeonarddeR
Describe the Feature This is a continuation of discussion in issue #3988
Currently SCons MSVC logic will not detect installed prerelease versions. To see these versions it needs to pass
-prereleaseflag to it's invocation ofvswhereAdditionally it may be possible to vastly speed up MSVC detect if we do the following
vswhere -all -prerelease -json(fix if incorrect invocation) and process the generated JSON file.