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authorJeffrey C Honig <jeffrey.honig@windriver.com>2012-07-16 20:48:57 -0400
committerRichard Purdie <richard.purdie@linuxfoundation.org>2012-07-17 10:54:07 +0100
commit4b8f43aaa6e612d3233ed87ed82b3e1229a9c17d (patch)
treeae348899d7352ecd15598d849ea29627312534b5 /bitbake/lib/bb/siggen.py
parent05e5ec2be8c0cf291956b46885bd847bb1987a3b (diff)
downloadpoky-4b8f43aaa6e612d3233ed87ed82b3e1229a9c17d.tar.gz
bitbake: siggen.py: Insure .siginfo files writes into shared sstate cache are atomic
Use tempfile.mkstemp to create a temporary file in the sstate dir and move it into place after closing. The previous code would fail in the chmod() if two users were running jobs that touched the same signature file. (Bitbake rev: ff11e9ac5eba2d957917664a7b91b1277d8ad548) Signed-off-by: Jeffrey C Honig <jeffrey.honig@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'bitbake/lib/bb/siggen.py')
-rw-r--r--bitbake/lib/bb/siggen.py19
1 files changed, 15 insertions, 4 deletions
diff --git a/bitbake/lib/bb/siggen.py b/bitbake/lib/bb/siggen.py
index edd98fcfc0..02a426864f 100644
--- a/bitbake/lib/bb/siggen.py
+++ b/bitbake/lib/bb/siggen.py
@@ -2,6 +2,7 @@ import hashlib
2import logging 2import logging
3import os 3import os
4import re 4import re
5import tempfile
5import bb.data 6import bb.data
6 7
7logger = logging.getLogger('BitBake.SigGen') 8logger = logging.getLogger('BitBake.SigGen')
@@ -236,10 +237,20 @@ class SignatureGeneratorBasic(SignatureGenerator):
236 if taint: 237 if taint:
237 data['taint'] = taint 238 data['taint'] = taint
238 239
239 with open(sigfile, "wb") as f: 240 fd, tmpfile = tempfile.mkstemp(dir=os.path.dirname(sigfile), prefix="sigtask.")
240 p = pickle.Pickler(f, -1) 241 try:
241 p.dump(data) 242 with os.fdopen(fd, "wb") as stream:
242 os.chmod(sigfile, 0664) 243 p = pickle.dump(data, stream, -1)
244 stream.flush()
245 os.fsync(fd)
246 os.chmod(tmpfile, 0664)
247 os.rename(tmpfile, sigfile)
248 except (OSError, IOError), err:
249 try:
250 os.unlink(tmpfile)
251 except OSError:
252 pass
253 raise err
243 254
244 def dump_sigs(self, dataCache): 255 def dump_sigs(self, dataCache):
245 for fn in self.taskdeps: 256 for fn in self.taskdeps: