* [PATCH] data_smart: Make ExpansionErrors more readable
@ 2021-09-10 13:26 Richard Purdie
0 siblings, 0 replies; only message in thread
From: Richard Purdie @ 2021-09-10 13:26 UTC (permalink / raw)
To: bitbake-devel
This adds context to ExpansionError messages which show the variable chain for which
expansion is being attempted. This should allow users to debug the issues more easily
than the current message (the first line alone below). Example output from a
SRC_URI which references ${S}:
bb.data_smart.ExpansionError: Failure expanding variable PV, expression was 0.1+git${SRCPV} which triggered exception RecursionError: maximum recursion depth exceeded while calling a Python object
The variable dependency chain for the failure is: PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV -> PV -> WORKDIR -> S -> SRC_URI -> SRCPV
-> PV -> BP -> FILESPATH
which is more useful that no output. We could truncate at repetition but I suspect
this makes this clearer as it stands so there is little value in complicating the code.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
lib/bb/data_smart.py | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/lib/bb/data_smart.py b/lib/bb/data_smart.py
index 65528c6ae6..515d195fe8 100644
--- a/lib/bb/data_smart.py
+++ b/lib/bb/data_smart.py
@@ -151,6 +151,7 @@ class ExpansionError(Exception):
self.expression = expression
self.variablename = varname
self.exception = exception
+ self.varlist = [varname or expression]
if varname:
if expression:
self.msg = "Failure expanding variable %s, expression was %s which triggered exception %s: %s" % (varname, expression, type(exception).__name__, exception)
@@ -160,8 +161,13 @@ class ExpansionError(Exception):
self.msg = "Failure expanding expression %s which triggered exception %s: %s" % (expression, type(exception).__name__, exception)
Exception.__init__(self, self.msg)
self.args = (varname, expression, exception)
+
+ def addVar(self, varname):
+ self.varlist.append(varname)
+
def __str__(self):
- return self.msg
+ chain = "\nThe variable dependency chain for the failure is: " + " -> ".join(self.varlist)
+ return self.msg + chain
class IncludeHistory(object):
def __init__(self, parent = None, filename = '[TOP LEVEL]'):
@@ -407,7 +413,8 @@ class DataSmart(MutableMapping):
raise
if s == olds:
break
- except ExpansionError:
+ except ExpansionError as e:
+ e.addVar(varname)
raise
except bb.parse.SkipRecipe:
raise
--
2.32.0
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