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2022-10-26utils/ply: Update md5 to better report errors with hashlibMark Hatle
In the case where hashlib is not available, the try would fail and fall through resulting in a backtrace on the usage of the 'sig'. The backtrace itself was confusing and made it difficult to determine what went wrong. Update the import to be in it's own try block with an appropriate message to indicate what went wrong. Note, the current version of ply all of this code has been restructured so this is not applicable upstream. Additionally, some versions of hashlib don't appear to implement the second FIPS related argument. Detect this and support both versions. Signed-off-by: Mark Hatle <mark.hatle@amd.com> Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org> Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
2022-09-29utils: Add enable_loopback_networking()Mattias Jernberg
It can be used to enable the loopback interface, typically after calling disable_network(). Also correct a typo in a debug message. Signed-off-by: Mattias Jernberg <mattias.jernberg@axis.com> Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-08-31utils: Pass lock argument in fileslockedJoshua Watt
Pass additional arguments in the fileslocked() context manager to the underlying lockfile() function. This allows the context manager to be used for any types of locks (non-blocking, shared, etc.) that the lockfile() function supports. Signed-off-by: Joshua Watt <JPEWhacker@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-08-09siggen: Fix insufficent entropy in sigtask file namesJoshua Watt
Signature generation uses mkstemp() to get a file descriptor to a unique file and then write the signature into it. However, the unique file name generation in glibc is based on the system timestamp, which means that with highly parallel builds it is more likely than one might expect expected that a conflict will occur between two different builder nodes. When operating over NFS (such as a shared sstate cache), this can cause race conditions and rare failures (particularly with NFS servers that may not correctly implement O_EXCL). The signature generation code is particularly susceptible to races since a single "sigtask." prefix used for all signatures from all tasks, which makes collision even more likely. To work around this, add an internal implementation of mkstemp() that adds additional truly random entropy to the file name to eliminate conflicts. Signed-off-by: Joshua Watt <JPEWhacker@gmail.com> Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
2022-07-28bb/utils: movefile: use the logger for printingJose Quaresma
Signed-off-by: Jose Quaresma <jose.quaresma@foundries.io> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2022-07-28bb/utils: remove: check the path again the expand python globJose Quaresma
When we call the remove with recurse=True we first check if the remove operation is safe in _check_unsafe_delete_path. But the check is been done on the path instaed of the expanded python glog. Signed-off-by: Jose Quaresma <jose.quaresma@foundries.io> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2022-03-24utils: Fix lockfile path length issuesRichard Purdie
If the path to bitbake.lock is in a deep directory, bitbake will hang. The reason was that the max file length limiting code (to 255 chars) was including the directory name and it should only act on the filename within the directory. Fix it to just use the base filename. [YOCTO #14766] Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-03-02utils/ply: Change md5 usages to work on FIPS enabled hostsMark Hatle
hashlib.md5() is not permitted on a FIPS enabled host system. This is due to md5 not being an approved hash algorithm. Instead use: hashlib.new('MD5', usedforsecurity=False) This is allowed, as it's clear the hash is used for a non-security purpose. Note: utils.py version should never be used to verify file integrity, but instead be used to identify if the file may have changed. sha256 should be used for integrity purposes. Signed-off-by: Mark Hatle <mark.hatle@xilinx.com> Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-02-21bitbake: Rename environment filtering variablesScott Murray
In line with the inclusive language migration defined at: https://wiki.yoctoproject.org/wiki/Inclusive_language rename: BB_ENV_WHITELIST -> BB_ENV_PASSTHROUGH BB_ENV_EXTRAWHITE -> BB_ENV_PASSTHROUGH_ADDITIONS (Bitbake rev: fe60627839d4280cf0117ed1afbfccdff1181b6a) Signed-off-by: Scott Murray <scott.murray@konsulko.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-02-21utils: Ensure shell function failure in python logging is correctRichard Purdie
If a python function exec_func() calls a shell task, the logging wasn't working correctly in all cases since the exception was turned into a BBHandledException() and the logfile piece was lost which is handled at the top task level. The easiest way to avoid this is to allow the ExecutionError exceptions to be raised to a higher level, we don't need the traceback for them. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-02-20utils: Fix typo "dependency" and "spawning"Zygmunt Krynicki
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-02-20utils: Fix environment decorator logic errorRichard Purdie
File "/home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work/qemuarm-poky-linux-gnueabi/core-image-sato/1.0-r0/testsdkext/layers/build/bitbake/lib/bb/fetch2/wget.py", line 328, in checkstatus with bb.utils.environment(**newenv): File "/home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work/qemuarm-poky-linux-gnueabi/core-image-sato/1.0-r0/testsdkext/buildtools/sysroots/x86_64-pokysdk-linux/usr/lib/python3.10/contextlib.py", line 142, in __exit__ next(self.gen) File "/home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work/qemuarm-poky-linux-gnueabi/core-image-sato/1.0-r0/testsdkext/layers/build/bitbake/lib/bb/utils.py", line 1737, in environment del os.environ[var] File "/home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work/qemuarm-poky-linux-gnueabi/core-image-sato/1.0-r0/testsdkext/buildtools/sysroots/x86_64-pokysdk-linux/usr/lib/python3.10/os.py", line 695, in __delitem__ raise KeyError(key) from None It is possible the wrapped function might change the environment which can lead to KeyError issues like this. The key may no longer be in the original environment so handle that case correctly and avoid the tracebacks. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-02-01bitbake: bitbake-worker: Preserve network non-local uidRobert Yang
The NIS can't work when network is dissable, so preserve network for it, the error is like: do_ypcall: clnt_call: RPC: Unable to send; errno = Network is unreachable Note, enable nscd on the build machine might be a solution, but that isn't reliable since it depends on whether the network function has been cached or not. Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-01-12utils: Add disable_network functionRichard Purdie
Add a function which uses the unshare glibc call to disable networking in the current process. This doesn't work on older distros/kernels but will on more recent ones so for now we simply ignore the cases we can't execute on. uid/gid can be passed in externally so this can work with pseudo/fakeroot contexts. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-01-05utils: Update to use exec_module() instead of load_module()Richard Purdie
This is deprecated in python 3.12 and Fedora 35 is throwing warnings so move to the new functions. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2021-11-19utils: Handle lockfile filenames that are too long for filesystemsRichard Purdie
The fetcher mirror code can go crazy creating lock filenames which exceed the filesystem limits. When this happens, the code will loop/hang. Handle the filename too long exception correctly but also truncate lockfile lengths to under 256 since the worst case situation is lockfile overlap and lack of parallelism. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2021-08-12utils: add environment updating context managerRoss Burton
bb.utils.environment() is a context manager to alter os.environ inside a specific block, restoring it after the block is closed. Signed-off-by: Ross Burton <ross.burton@arm.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2021-08-06fetch/tests/toaster: Override conversion fixupsRichard Purdie
Fix some references that missed during the overrides syntax migration or were incorrect. Thanks to Quentin Schulz <foss@0leil.net> for the patch. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2021-05-06lib/bb: Add bb.utils.rename() helper function and use for renamingDevendra Tewari
os.rename can fail for example an incremental build in Docker fails with: OSError: [Errno 18] Invalid cross-device link when source and destination are on different overlay filesystems. Rather than trying to fix every call site, add a wrapper in bb.utils for renames. We can then handle cross device failures and fall back to shutil.move. The reason os.rename is still used is because shutil.move is too slow for speed sensitive sections of code. [YOCTO #14301] Signed-off-by: Devendra Tewari <devendra.tewari@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2021-02-10logging: Make bitbake logger compatible with python loggerJoshua Watt
The bitbake logger overrode the definition of the debug() logging call to include a debug level, but this causes problems with code that may be using standard python logging, since the extra argument is interpreted differently. Instead, change the bitbake loggers debug() call to match the python logger call and add a debug2() and debug3() API to replace calls that were logging to a different debug level. [RP: Small fix to ensure bb.debug calls bbdebug()] Signed-off-by: Joshua Watt <JPEWhacker@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2021-01-05utils: add docstrings to functionsMilan Shah
A list of functions that now has a docstring. * vercmp_string * explode_dep_versions * prunedir * prune_suffix * to_boolean * contains_any * export_proxies See [YOCTO #9725] for details. Signed-off-by: Milan Shah <mshah@mvista.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-09-28utils: add umask changing context managerRoss Burton
Add a umask context manager which can be used to temporarily change the umask in a 'with' block. Signed-off-by: Ross Burton <ross.burton@arm.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-09-09utils: fix UnboundLocalError when _print_exception raisesChris Laplante
PEP 3110 changed how exceptions work. 'e' is unbound after the 'except' clause. See: https://www.python.org/dev/peps/pep-3110/#semantic-changes Signed-off-by: Chris Laplante <chris.laplante@agilent.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-09-09utils.py: get_file_layer(): Improve performanceRobert Yang
The following code costs a lot of time when there are lot of layers and recipes: for collection in collections: collection_res[collection] = d.getVar('BBFILE_PATTERN_%s' % collection) or '' My build has more than 100 layers and 3000 recipes, which calls d.getVar() 300K (3000 * 100) times and makes 'bitbake-layers show-recipes' very slow, add a keyword argument to get_file_layer() can fix the problem, it can save about 90% time in my build (6min -> 40s). Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-09-09utils.py: get_file_layer(): Exit the loop when file is matchedRobert Yang
This can make "$ bitbake-layers show-recipes" save about 60% time (14min -> 6min) in my build (more than 3000 recipes) The command "bitbake-layers show-recipes" calls bb.utils.get_file_layer() with each recipe, and get_file_layer() compare the file with each item in BBFILES which makes it very time consuming when there are a lot of recipes and items in BBFILES. So use BBFILES_PRIORITIZED and exit when file is matched, it doesn't make sense to go on the loop when file is matched. And use fnmatchcase to replace of fnmatch since the comparison should be case-sensitive. Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-09-09utils: process_profilelog: use context managerChris Laplante
Signed-off-by: Chris Laplante <chris.laplante@agilent.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-08-26utils: Drop broken timeout functionRichard Purdie
I strongly suspect this function doesn't work with modern python so and its unused now, drop it. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-06-15lib/bb/utils.py: Do not preserve TERM in the environmentJacob Kroon
The value of TERM is leaking into OE-Core postinst-useradd-${PN} scripts, which in turn can optionally be monitored by buildhistory. Prune the value in order to make the OE-Core buildhistory output more deterministic. Signed-off-by: Jacob Kroon <jacob.kroon@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-02-22lib/bb/utils.py: Preserve ownership of symlinkDaisuke Yamane
Yocto Bug: https://bugzilla.yoctoproject.org/show_bug.cgi?id=13806 Uncomment lchown() to preserve ownership of symlink. Signed-off-by: Daisuke Yamane <daisuke.yamane@cybertrust.co.jp> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-01-27utils: add is_semver functionJean-Marie LEMETAYER
This function checks if a string is a semantic version: https://semver.org/spec/v2.0.0.html The npm fetcher needs this function to validate its version parameter. Signed-off-by: Jean-Marie LEMETAYER <jean-marie.lemetayer@savoirfairelinux.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-01-27utils: add sha384_file and sha512_file functionsJean-Marie LEMETAYER
The npm fetcher needs these functions to support the subresource integrity: https://www.w3.org/TR/SRI/ Signed-off-by: Jean-Marie LEMETAYER <jean-marie.lemetayer@savoirfairelinux.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-01-19bb.utils: add get_referenced_varsChris Laplante via bitbake-devel
Given a start expression, bb.utils.get_referenced_vars returns the referenced variable names in a quasi-BFS order (variables within the same level are ordered aribitrarily). For example, given an empty data store: bb.utils.get_referenced_vars("${A} ${B} ${d.getVar('C')}", d) returns either ["A", "B", "C"], ["A", "C", "B"], or another permutation. If we then set A = "${F} ${G}", then the same call will return a permutation of [A, B, C] concatenated with a permutation of [F, G]. This method is like a version of d.expandWithRefs().references that gives some insight into the depth of variable references. Signed-off-by: Chris Laplante <chris.laplante@agilent.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-01-19lib: remove unused importsFrazer Clews
removed unused imports which made the code harder to read, and slightly but less efficient Signed-off-by: Frazer Clews <frazer.clews@codethink.co.uk> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-12-13bb.utils.fileslocked: don't leak files if yield throwsChris Laplante via bitbake-devel
Discovered with a recipe under devtool. The ${S}/singletask.lock file (added by externalsrc.bbclass) was leaked, giving a warning like: WARNING: <PN>+git999-r0 do_populate_lic: /home/laplante/yocto/sources/poky/bitbake/lib/bb/build.py:582: ResourceWarning: unclosed file <_io.TextIOWrapper name='/home/laplante/yocto/build/workspace/sources/<PN>/singletask.lock' mode='a+' encoding='UTF-8'> exec_func(task, localdata) Signed-off-by: Chris Laplante <chris.laplante@agilent.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-11-14utils: also use mmap for SHA256 and SHA1, for performanceRoss Burton
md5_file() uses a mmap() window to improve performance when hashing files, so refactor the code and do the same for SHA1 and SHA256. Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-09-19utils: Add ionice option to prunedirRichard Purdie
Autobuilder type infrastructure can benefit from deletion of certain files as background IO due to the way Linux filesystem priority works. We have problems where build directories as part of oe-selftest being delete starves the running tasks of IO to the point builds take much longer to compelte. Having this option of running the deletion at "idle" helps a lot with that. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-09-03utils: Fix movefile() exception handling with python3Martin Jansa
* with python3 this fails with: File: 'bitbake/lib/bb/utils.py', lineno: 799, function: movefile 0795: try: 0796: os.rename(src, destpath) 0797: renamefailed = 0 0798: except Exception as e: *** 0799: if e[0] != errno.EXDEV: 0800: # Some random error. 0801: print("movefile: Failed to move", src, "to", dest, e) 0802: return None 0803: # Invalid cross-device-link 'bind' mounted or actually Cross-Device Exception: TypeError: 'OSError' object is not subscriptable Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-08-06build/utils: Drop bb.build.FuncFailedRichard Purdie
Its hard to see what this exception adds in the current codebase. The logfile attribute is effectively ignored, the exception doesn't serve a defined purpose and mostly seems to be worked around. Remove it entirely. If this does cause output problems, we'll figure out better ways to address those. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-05-04bitbake: Strip old editor directives from file headersRichard Purdie
There are much better ways to handle this and most editors shouldn't need this in modern times, drop the noise from the files. Its not consitently applied anyway. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-05-04bitbake: Drop duplicate license boilerplace textRichard Purdie
With the introduction of SPDX-License-Identifier headers, we don't need a ton of header boilerplate in every file. Simplify the files and rely on the top level for the full licence text. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-05-04bitbake: Add initial pass of SPDX license headers to source codeRichard Purdie
This adds the SPDX-License-Identifier license headers to the majority of our source files to make it clearer exactly which license files are under. The bulk of the files are under GPL v2.0 with one found to be under V2.0 or later, some under MIT and some have dual license. There are some files which are potentially harder to classify where we've imported upstream code and those can be handled specifically in later commits. The COPYING file is replaced with LICENSE.X files which contain the full license texts. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-04-11utils: Let mkdirhier fail if existing path is not a folderAndre Rosa
Let mkdirhier fail if existing path is not a folder instead of assuming a directory hierarchy already exists. Signed-off-by: Andre Rosa <andre.rosa@lge.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-04-07utils: Make prune_suffix prune a suffixAndre Rosa
Make prune_suffix prune a suffix instead of replacing a substring that could happen more than once and not only when it ends with it. Signed-off-by: Andre Rosa <andre.rosa@lge.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-02-25bitbake: fix version comparison when one of the versions ends in .Alexander Kanavin
Previously, this would happen: ====================================================================== ERROR: test_vercmpstring (bb.tests.utils.VerCmpString) ---------------------------------------------------------------------- Traceback (most recent call last): File "/home/alexander/development/poky/bitbake/lib/bb/tests/utils.py", line 45, in test_vercmpstring result = bb.utils.vercmp_string('1.', '1.1') File "/home/alexander/development/poky/bitbake/lib/bb/utils.py", line 143, in vercmp_string return vercmp(ta, tb) File "/home/alexander/development/poky/bitbake/lib/bb/utils.py", line 135, in vercmp r = vercmp_part(va, vb) File "/home/alexander/development/poky/bitbake/lib/bb/utils.py", line 124, in vercmp_part elif ca < cb: TypeError: '<' not supported between instances of 'NoneType' and 'int' ---------------------------------------------------------------------- Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2018-12-14utils: Add aarch64 support to ioprio_setRichard Purdie
With aarch64 hosts coming into use, set the syscall number to avoid ioprio warnings on that platform. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2018-12-07utils: Use utils.remove() within prunedir()Richard Purdie
We've already tweaked remove() for speed and not to error if it races for deletion. Therefore use this for prunedir() which was starting to show the same bug reports. [YOCTO #13003] Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2018-11-16utils: better_compile(): Fix line number when report errorsRobert Yang
Fixed: - Add an error line in base.bbclass, e.g.: 15 16 def oe_import(d): 17 import sys 18 Compile error 19 bbpath = d.getVar("BBPATH").split(":") [snip] Note the "Compile error" line, I added it for reporting errors. $ bitbake -p ERROR: Error in compiling python function in /buildarea1/lyang1/poky/meta/classes/base.bbclass, line 15: The code lines resulting in this error were: 0014: import oe.data 0015: for toimport in oe.data.typed_value("OE_IMPORTS", d): 0016: imported = __import__(toimport) 0017: inject(toimport.split(".", 1)[0], imported) *** 0018: 0019: return "" 0020: SyntaxError: invalid syntax (base.bbclass, line 18) There are 2 problems: - The "line 15" is incorrect, it is a blank line, not the error line. - The "*** 0018" points to incorrect position. These two problems would mislead people a lot sometimes. - Now fix it to: $ bitbake -p ERROR: Error in compiling python function in /buildarea1/lyang1/poky/meta/classes/base.bbclass, line 18: The code lines resulting in this error were: 0001:def oe_import(d): 0002: import sys *** 0003: Compile error 0004: bbpath = d.getVar("BBPATH").split(":") [snip] SyntaxError: invalid syntax (base.bbclass, line 18) Please see comments in the code for more details on how it is fixed. Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2018-11-13utils: Avoid regex value escape warningsRichard Purdie
Avoid warnings such as: bitbake/lib/bb/utils.py:72: DeprecationWarning: invalid escape sequence \d numeric_regexp = re.compile('^(\d+)(.*)$') bitbake/lib/bb/utils.py:1165: DeprecationWarning: invalid escape sequence \( var_res[var] = re.compile('^(%s%s)[ \\t]*\([ \\t]*\)[ \\t]*{' % (var[:-2].rstrip(), override_re)) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2018-11-13utils: Avoid warnings about deprecated imp moduleRichard Purdie
The imp module is deprecated, port the code over to use importlib. bitbake/lib/bb/utils.py:30: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses import imp Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2018-09-25utils: lockfile: Fix infinite loopIoan-Adrian Ratiu
A nasty corner case leads to a hang when utils.lockfile is called from oe-core's package-manager:deploy_dir_lock (in turn called from rootfs:_create further up the call stack) with "name" owned by root and the user running bitbake has no write access. Because this code runs under pseudo, the UID and EUID of the bitbake worker process are 0, so the os.access(dirname, os.W_OK) returns True i.e. it thinks the path is writable when in fact it's not writable. Only later when trying to open the file an Exception it thrown because the OS prohibits writing, but the Exception is ignored and the open is retried leading to an infinite loop. So this fix is to not ignore the "Permission Denied" exception. An alternative fix would be to replace the os.access() call with an try: open() except() at the beginning of the function. Signed-off-by: Ioan-Adrian Ratiu <adrian.ratiu@ni.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>