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Konrad Scherer e1c173621a gen-lockedsig-cache: Replace glob lookup with hash to filename lookup

Using the glob function to map signatures to sstate files is very slow
when the sstate is large and accessed over nfs. The lookup now only
loads the necessary prefixes and doesn't use glob as all.

Unfortunately I don't have access to the systems where the performance
isse was noticed and on my test system the glob is fast enough that
the performance numbers aren't useful. I could verify that file list
returned by the new code is the same.

[YOCTO #13539]

(From OE-Core rev: ad36335b8592e0387dd36066920cd5ffefd375f8)

Signed-off-by: Konrad Scherer <Konrad.Scherer@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2019-10-02 20:22:25 +01:00

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#!/usr/bin/env python3

SPDX-License-Identifier: GPL-2.0-only

import os import sys import shutil import errno import time

def mkdir(d): try: os.makedirs(d) except OSError as e: if e.errno != errno.EEXIST: raise e

extract the hash from past the last colon to last underscore

def extract_sha(filename): return filename.split(':')[7].split('_')[0]

get all files in a directory, extract hash and make

a map from hash to list of file with that hash

def map_sha_to_files(dir_, prefix, sha_map): sstate_prefix_path = dir_ + '/' + prefix + '/' sstate_files = os.listdir(sstate_prefix_path) for f in sstate_files: try: sha = extract_sha(f) if sha not in sha_map: sha_map[sha] = [] sha_map[sha].append(sstate_prefix_path + f) except IndexError: continue

given a prefix build a map of hash to list of files

def build_sha_cache(prefix): sha_map = {}

sstate_dir = sys.argv[2]
map_sha_to_files(sstate_dir, prefix, sha_map)

native_sstate_dir = sys.argv[2] + '/' + sys.argv[4]
map_sha_to_files(native_sstate_dir, prefix, sha_map)

return sha_map

if len(sys.argv) < 5: print("Incorrect number of arguments specified") print("syntax: gen-lockedsig-cache <locked-sigs.inc> [filterfile]") sys.exit(1)

filterlist = [] if len(sys.argv) > 5: print('Reading filter file %s' % sys.argv[5]) with open(sys.argv[5]) as f: for l in f.readlines(): if ":" in l: filterlist.append(l.rstrip())

print('Reading %s' % sys.argv[1]) sigs = [] with open(sys.argv[1]) as f: for l in f.readlines(): if ":" in l: task, sig = l.split()[0].rsplit(':', 1) if filterlist and not task in filterlist: print('Filtering out %s' % task) else: sigs.append(sig)

print('Gathering file list') start_time = time.perf_counter() files = set() sstate_content_cache = {} for s in sigs: prefix = s[:2] if prefix not in sstate_content_cache: sstate_content_cache[prefix] = build_sha_cache(prefix)

for f in sstate_content_cache[prefix][s]:
    files.add(f)

elapsed = time.perf_counter() - start_time print("Gathering file list took %.1fs" % elapsed)

print('Processing files') for f in files: sys.stdout.write('Processing %s... ' % f) _, ext = os.path.splitext(f) if not ext in ['.tgz', '.siginfo', '.sig']: # Most likely a temp file, skip it print('skipping') continue dst = os.path.join(sys.argv[3], os.path.relpath(f, sys.argv[2])) destdir = os.path.dirname(dst) mkdir(destdir)

src = os.path.realpath(f)
if os.path.exists(dst):
    os.remove(dst)
if (os.stat(src).st_dev == os.stat(destdir).st_dev):
    print('linking')
    try:
        os.link(src, dst)
    except OSError as e:
        print('hard linking failed, copying')
        shutil.copyfile(src, dst)
else:
    print('copying')
    shutil.copyfile(src, dst)

print('Done!')

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