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Add wrapper for buck so it can be executed easily

This downloads the same version of buck as "./go" does so
the two will play nicely together and share the same cache
(and only download buck once)

The buckw script takes the same arguments as buck itself.
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shs96c committed Jan 19, 2018
1 parent 1ca162c commit ecdad5f4209607c285edd497a556e5ebbc1ed599
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66 buckw
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#!/usr/bin/env python2
import hashlib
import os
import os.path
import requests
import shutil
import stat
import sys
from subprocess import call
buck_version = open(".buckversion").readline().rstrip()
buck_hash = open(".buckhash").readline().rstrip()
buck_pex = os.path.join("buck-out", "crazy-fun", buck_version, "buck.pex")
url = "https://github.com/SeleniumHQ/buck/releases/download/buck-release-%s/buck.pex" % buck_version
def download(url, out, hash):
base_name = os.path.dirname(out)
if not os.path.exists(base_name):
try:
os.makedirs(base_name)
except OSError as e:
if e.errno != errno.EEXIST:
raise
print "Downloading Buck. This may take some time"
response = requests.get(url, stream=True)
if response.status_code != 200:
raise IOError("Unable to download buck")
total_length = float(response.headers.get('content-length'))
count = 0
with open(out, "wb") as f:
md5 = hashlib.md5()
for chunk in response.iter_content(chunk_size=4096):
count += len(chunk)
done = int(50 * float(count) / total_length)
sys.stdout.write("\r[%s%s]" % ('=' * done, ' ' * (50-done)) )
sys.stdout.flush()
f.write(chunk)
md5.update(chunk)
if md5.hexdigest() != hash:
raise IOError("Downloaded buck version doesn't match expected hash")
if os.path.isfile(buck_pex):
md5 = hashlib.md5()
with open(buck_pex, "rb") as f:
for chunk in iter(lambda: f.read(4096), b""):
md5.update(chunk)
if md5.hexdigest() != buck_hash:
print "MD5 hashes don't match. Re-downloading"
download(url, buck_pex, buck_hash)
else:
download(url, buck_pex, buck_hash)
st = os.stat(buck_pex)
os.chmod(buck_pex, st.st_mode | stat.S_IEXEC)
sys.argv.pop(0)
args = ["python2", buck_pex]
args.extend(sys.argv)
call(args)

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