MessageNotUnderstood: UndefinedObject>>key from GitRefCache>>#allWithPrefix:ifAbsentPutAll:

[LinqLover]

This debugger appeared in my image while I switched on the command line to another branch:

Bug report

26 December 2023 10:13:51.545344 pm
VM: Win32 - Smalltalk

Image: Squeak6.1alpha [latest update: #22911]
SecurityManager state:

Restricted: false

FileAccess: true

SocketAccess: true

Working Dir C:\Users\Christoph\OneDrive\Dokumente\Squeak

Trusted Dir C:\Users\Christoph\OneDrive\Dokumente\Squeak\Christoph

Untrusted Dir C:\Users\Christoph\OneDrive\Dokumente\My Squeak
UndefinedObject(Object)>>doesNotUnderstand: #key

Receiver: nil

Arguments and temporary variables:

aMessage: 	key

exception: 	MessageNotUnderstood: UndefinedObject>>key

resumeValue: 	nil

Receiver's instance variables:

nil
Dictionary>>add:

Receiver: a Dictionary()

Arguments and temporary variables:

anAssociation: 	nil

index: 	nil

element: 	nil

Receiver's instance variables:

tally: 	0

array: 	#(nil nil nil nil nil)
[] in GitRefCache>>allWithPrefix:ifAbsentPutAll:

Receiver: a GitRefCache

Arguments and temporary variables:

aString: 	'refs/heads/'

aBlock: 	[closure] in GitUnitOfWork>>allReferencesPrefixedWith:do:

newRefs: 	an OrderedCollection(nil 'refs/heads/fix-baseline'->'f6104d3685d243f61...etc...

each: 	nil

Receiver's instance variables:

refs: 	a Dictionary()

symbolicRefs: 	nil

resolvedRefs: 	a Dictionary()

prefixesCompletelyEnumerated: 	an OrderedCollection()
OrderedCollection>>do:

Receiver: an OrderedCollection(nil 'refs/heads/fix-baseline'->'f6104d3685d243f6134583048a96edb8dc2d6...etc...

Arguments and temporary variables:

aBlock: 	[closure] in GitRefCache>>allWithPrefix:ifAbsentPutAll:

index: 	1

Receiver's instance variables:

array: 	{nil . 'refs/heads/fix-baseline'->'f6104d3685d243f6134583048a96edb8dc2d6...etc...

firstIndex: 	1

lastIndex: 	51
GitRefCache>>allWithPrefix:ifAbsentPutAll:

Receiver: a GitRefCache

Arguments and temporary variables:

aString: 	'refs/heads/'

aBlock: 	[closure] in GitUnitOfWork>>allReferencesPrefixedWith:do:

newRefs: 	an OrderedCollection(nil 'refs/heads/fix-baseline'->'f6104d3685d243f61...etc...

Receiver's instance variables:

refs: 	a Dictionary()

symbolicRefs: 	nil

resolvedRefs: 	a Dictionary()

prefixesCompletelyEnumerated: 	an OrderedCollection()
GitUnitOfWork>>allReferencesPrefixedWith:do:

Receiver: a GitUnitOfWork on a GitRepository C:\Users\Christoph\Documents\repos\squeak-tracedebugger...etc...

Arguments and temporary variables:

prefixString: 	'refs/heads/'

aBlock: 	[closure] in GitUnitOfWork>>allShortenedRefsIn:

Receiver's instance variables:

repository: 	a GitRepository C:\Users\Christoph\Documents\repos\squeak-tracedebu...etc...

objectStores: 	an OrderedCollection(a GitLooseObjectStore a GitPackedObjectStore...etc...

refStores: 	an OrderedCollection(a GitLooseRefStore a GitPackedRefStore)

refLogs: 	a Dictionary()

config: 	nil

refCache: 	a GitRefCache
GitUnitOfWork>>allShortenedRefsIn:

Receiver: a GitUnitOfWork on a GitRepository C:\Users\Christoph\Documents\repos\squeak-tracedebugger...etc...

Arguments and temporary variables:

aString: 	'refs/heads'

names: 	an OrderedCollection()

prefix: 	'refs/heads/'

prefixLength: 	11

Receiver's instance variables:

repository: 	a GitRepository C:\Users\Christoph\Documents\repos\squeak-tracedebu...etc...

objectStores: 	an OrderedCollection(a GitLooseObjectStore a GitPackedObjectStore...etc...

refStores: 	an OrderedCollection(a GitLooseRefStore a GitPackedRefStore)

refLogs: 	a Dictionary()

config: 	nil

refCache: 	a GitRefCache
GitUnitOfWork>>branchNames

Receiver: a GitUnitOfWork on a GitRepository C:\Users\Christoph\Documents\repos\squeak-tracedebugger...etc...

Arguments and temporary variables:
Receiver's instance variables: 
	repository: 	a GitRepository C:\Users\Christoph\Documents\repos\squeak-tracedebu...etc...
	objectStores: 	an OrderedCollection(a GitLooseObjectStore a GitPackedObjectStore...etc...
	refStores: 	an OrderedCollection(a GitLooseRefStore a GitPackedRefStore)
	refLogs: 	a Dictionary()
	config: 	nil
	refCache: 	a GitRefCache

FileSystemGitRepository>>branchNames

Receiver: a FileSystemGitRepository

Arguments and temporary variables:
Receiver's instance variables: 
	repository: 	a GitRepository C:\Users\Christoph\Documents\repos\squeak-tracedebu...etc...

SquitRepository>>historians

Receiver: a SquitRepository

Arguments and temporary variables:
Receiver's instance variables: 
	gitRepository: 	a FileSystemGitRepository
	versionsCache: 	a WeakValueDictionary(size 603)
	filesystemsCache: 	a Dictionary()
	leastRecentlyRequestedFilesystems: 	an OrderedCollection()
	credentials: 	a Dictionary('https://github.com/hpi-swa-lab/squeak-tracedebugger'...etc...
	cachedSnapshots: 	{commit 7c7d4d4 "update expectedFailures and timeouts for test...etc...

SquitBrowser>>loadBranchList

Receiver: a SquitBrowser

Arguments and temporary variables:

list: 	nil

project: 	TraceDebugger

historians: 	nil

localHistorians: 	nil

remoteHistorians: 	nil

Receiver's instance variables:

dependents: 	a DependentsArray(a PluggableSystemWindow<Git Browser: TraceDebugge...etc...

projectIndex: 	7

commitSelection: 	commit 45ec457 "Merge remote-tracking branch 'origin/main'"

objectIndex: 	nil

objectCache: 	{Unrecorded files . packages/BaselineOfTraceDebugger.package . pac...etc...

commitForCache: 	commit 45ec457 "Merge remote-tracking branch 'origin/main'"

timeOfLastListUpdate: 	3881077669035

searchTerm: 	''

offeredToAddFirstProject: 	true

repositoryExists: 	true

cachedCommitList: 	an OrderedCollection(commit 7c7d4d4 "update expectedFailures ...etc...

commitListBuildProcess: 	a Process(SquitBrowser commit list loader) in [] in FullBlockClosure...etc...

selectedHistorian: 	a SquitHistorian('refs/heads/main')

indexOfActiveHistorianInBranchList: 	33

branchList: 	an OrderedCollection('''range-retracing-improvements-2''' 'benchmar...etc...

commitToDiffAgainst: 	nil

indexOfFirstRemoteTrackingBranch: 	51

historiansForDecoration: 	a Dictionary(commit 01fcccf "Add msising method"->an OrderedCollection...etc...
[] in [] in SquitBrowser>>refresh

Receiver: a SquitBrowser

Arguments and temporary variables:
Receiver's instance variables: 
	dependents: 	a DependentsArray(a PluggableSystemWindow<Git Browser: TraceDebugge...etc...
	projectIndex: 	7
	commitSelection: 	commit 45ec457 "Merge remote-tracking branch 'origin/main'"
	objectIndex: 	nil
	objectCache: 	{Unrecorded files . packages/BaselineOfTraceDebugger.package . pac...etc...
	commitForCache: 	commit 45ec457 "Merge remote-tracking branch 'origin/main'"
	timeOfLastListUpdate: 	3881077669035
	searchTerm: 	''
	offeredToAddFirstProject: 	true
	repositoryExists: 	true
	cachedCommitList: 	an OrderedCollection(commit 7c7d4d4 "update expectedFailures ...etc...
	commitListBuildProcess: 	a Process(SquitBrowser commit list loader) in [] in FullBlockClosure...etc...
	selectedHistorian: 	a SquitHistorian('refs/heads/main')
	indexOfActiveHistorianInBranchList: 	33
	branchList: 	an OrderedCollection('''range-retracing-improvements-2''' 'benchmar...etc...
	commitToDiffAgainst: 	nil
	indexOfFirstRemoteTrackingBranch: 	51
	historiansForDecoration: 	a Dictionary(commit 01fcccf "Add msising method"->an OrderedCollection...etc...

[] in GitCurrentUnitOfWork class(DynamicVariable class)>>value:during:

Receiver: GitCurrentUnitOfWork

Arguments and temporary variables:

anObject: 	a Dictionary(a GitRepository C:\Users\Christoph\Documents\repos\squea...etc...

aBlock: 	[closure] in [] in SquitBrowser>>refresh

p: 	a Process(44380) in MorphicProject>>suspendProcessSafely:

oldValue: 	nil

outerScopeWasDynamic: 	false

Receiver's instance variables:

superclass: 	DynamicVariable

methodDict: 	a MethodDictionary()

format: 	0

instanceVariables: 	nil

organization: 	('as yet unclassified')
	subclasses: 	nil
	name: 	#GitCurrentUnitOfWork
	classPool: 	nil
	sharedPools: 	nil
	environment: 	Smalltalk
	category: 	#'FileSystem-Git-Plumbing-Core'
	hash: 	99344143

FullBlockClosure(BlockClosure)>>ensure:

Receiver: [closure] in GitCurrentUnitOfWork class(DynamicVariable class)>>value:during:

Arguments and temporary variables:

aBlock: 	[closure] in GitCurrentUnitOfWork class(DynamicVariable class)>>value:during:...etc...

complete: 	nil

returnValue: 	nil

Receiver's instance variables:

outerContext: 	GitCurrentUnitOfWork class(DynamicVariable class)>>value:during:

startpcOrMethod: 	([] in DynamicVariable class>>#value:during: "a CompiledBlock(...etc...

numArgs: 	0

receiver: 	GitCurrentUnitOfWork
GitCurrentUnitOfWork class(DynamicVariable class)>>value:during:

Receiver: GitCurrentUnitOfWork

Arguments and temporary variables:

anObject: 	a Dictionary(a GitRepository C:\Users\Christoph\Documents\repos\squea...etc...

aBlock: 	[closure] in [] in SquitBrowser>>refresh

p: 	a Process(44380) in MorphicProject>>suspendProcessSafely:

oldValue: 	nil

outerScopeWasDynamic: 	false

Receiver's instance variables:

superclass: 	DynamicVariable

methodDict: 	a MethodDictionary()

format: 	0

instanceVariables: 	nil

organization: 	('as yet unclassified')
	subclasses: 	nil
	name: 	#GitCurrentUnitOfWork
	classPool: 	nil
	sharedPools: 	nil
	environment: 	Smalltalk
	category: 	#'FileSystem-Git-Plumbing-Core'
	hash: 	99344143

GitCurrentUnitOfWork class>>value:for:during:

Receiver: GitCurrentUnitOfWork

Arguments and temporary variables:

aGitUnitOfWork: 	a GitUnitOfWork on a GitRepository C:\Users\Christoph\Documents...etc...

anObject: 	a GitRepository C:\Users\Christoph\Documents\repos\squeak-tracedebugg...etc...

aBlock: 	[closure] in [] in SquitBrowser>>refresh

Receiver's instance variables:

superclass: 	DynamicVariable

methodDict: 	a MethodDictionary()

format: 	0

instanceVariables: 	nil

organization: 	('as yet unclassified')
	subclasses: 	nil
	name: 	#GitCurrentUnitOfWork
	classPool: 	nil
	sharedPools: 	nil
	environment: 	Smalltalk
	category: 	#'FileSystem-Git-Plumbing-Core'
	hash: 	99344143

GitUnitOfWork>>activateDuring:

Receiver: a GitUnitOfWork on a GitRepository C:\Users\Christoph\Documents\repos\squeak-tracedebugger...etc...

Arguments and temporary variables:

aBlock: 	[closure] in [] in SquitBrowser>>refresh

Receiver's instance variables:

repository: 	a GitRepository C:\Users\Christoph\Documents\repos\squeak-tracedebu...etc...

objectStores: 	an OrderedCollection(a GitLooseObjectStore a GitPackedObjectStore...etc...

refStores: 	an OrderedCollection(a GitLooseRefStore a GitPackedRefStore)

refLogs: 	a Dictionary()

config: 	nil

refCache: 	a GitRefCache
SquitUnitOfWork>>activateDuring:

Receiver: a SquitUnitOfWork

Arguments and temporary variables:

aBlock: 	[closure] in [] in SquitBrowser>>refresh

Receiver's instance variables:

repository: 	a SquitRepository

numberOfClients: 	1

gitUnitOfWork: 	a GitUnitOfWork on a GitRepository C:\Users\Christoph\Documents...etc...
[] in SquitBrowser>>withUnitOfWork:

Receiver: a SquitBrowser

Arguments and temporary variables:

aBlock: 	[closure] in [] in SquitBrowser>>refresh

unitOfWork: 	a SquitUnitOfWork

Receiver's instance variables:

dependents: 	a DependentsArray(a PluggableSystemWindow<Git Browser: TraceDebugge...etc...

projectIndex: 	7

commitSelection: 	commit 45ec457 "Merge remote-tracking branch 'origin/main'"

objectIndex: 	nil

objectCache: 	{Unrecorded files . packages/BaselineOfTraceDebugger.package . pac...etc...

commitForCache: 	commit 45ec457 "Merge remote-tracking branch 'origin/main'"

timeOfLastListUpdate: 	3881077669035

searchTerm: 	''

offeredToAddFirstProject: 	true

repositoryExists: 	true

cachedCommitList: 	an OrderedCollection(commit 7c7d4d4 "update expectedFailures ...etc...

commitListBuildProcess: 	a Process(SquitBrowser commit list loader) in [] in FullBlockClosure...etc...

selectedHistorian: 	a SquitHistorian('refs/heads/main')

indexOfActiveHistorianInBranchList: 	33

branchList: 	an OrderedCollection('''range-retracing-improvements-2''' 'benchmar...etc...

commitToDiffAgainst: 	nil

indexOfFirstRemoteTrackingBranch: 	51

historiansForDecoration: 	a Dictionary(commit 01fcccf "Add msising method"->an OrderedCollection...etc...
--- The full stack ---

UndefinedObject(Object)>>doesNotUnderstand: #key

Dictionary>>add:

[] in GitRefCache>>allWithPrefix:ifAbsentPutAll:

OrderedCollection>>do:

GitRefCache>>allWithPrefix:ifAbsentPutAll:

GitUnitOfWork>>allReferencesPrefixedWith:do:

GitUnitOfWork>>allShortenedRefsIn:

GitUnitOfWork>>branchNames

FileSystemGitRepository>>branchNames

SquitRepository>>historians

SquitBrowser>>loadBranchList

[] in [] in SquitBrowser>>refresh

[] in GitCurrentUnitOfWork class(DynamicVariable class)>>value:during:

FullBlockClosure(BlockClosure)>>ensure:

GitCurrentUnitOfWork class(DynamicVariable class)>>value:during:

GitCurrentUnitOfWork class>>value:for:during:

GitUnitOfWork>>activateDuring:

SquitUnitOfWork>>activateDuring:

[] in SquitBrowser>>withUnitOfWork:

FullBlockClosure(BlockClosure)>>ensure:

SquitBrowser>>withUnitOfWork:

[] in SquitBrowser>>refresh

FullBlockClosure(BlockClosure)>>ensure:

CursorWithMask(Cursor)>>showWhile:

SquitBrowser>>refresh

SquitBrowser>>stepAt:in:

PluggableSystemWindow(SystemWindow)>>stepAt:

StepMessage(MorphicAlarm)>>value:

[] in WorldState>>runLocalStepMethodsIn:

[] in ActiveWorldVariable class(DynamicVariable class)>>value:during:

FullBlockClosure(BlockClosure)>>ensure:

ActiveWorldVariable class(DynamicVariable class)>>value:during:

[] in ActiveWorldVariable class>>value:during:

FullBlockClosure(BlockClosure)>>ensure:

ActiveWorldVariable class>>value:during:

PasteUpMorph>>becomeActiveDuring:

WorldState>>runLocalStepMethodsIn:

WorldState>>runStepMethodsIn:

PasteUpMorph>>runStepMethods

[] in WorldState>>doOneCycleNowFor:

[] in ActiveWorldVariable class(DynamicVariable class)>>value:during:

FullBlockClosure(BlockClosure)>>ensure:

ActiveWorldVariable class(DynamicVariable class)>>value:during:

[] in ActiveWorldVariable class>>value:during:

FullBlockClosure(BlockClosure)>>ensure:

ActiveWorldVariable class>>value:during:

PasteUpMorph>>becomeActiveDuring:

WorldState>>doOneCycleNowFor:

WorldState>>doOneCycleFor:

PasteUpMorph>>doOneCycle

[] in MorphicProject>>spawnNewProcess

[] in FullBlockClosure(BlockClosure)>>newProcess

Looks like ref: may answer nil in some situations but GitUnitOfWork>>#allReferencesPrefixedWith:do:/GitRefCache>>#allWithPrefix:ifAbsentPutAll: is not prepared for that?

[j4yk]

Exactly what you concluded.

Now actually I would like to better understand why ref: returned nil here, and avoid that from entering the collection in the first place. Refs shouldn't disappear while enumerating them. Also why would one ref disappear when you switched branches?

[LinqLover]

Also why would one ref disappear when you switched branches?

Very good question! I can imagine that the external git client I used (VS Code VCS) has created some temporary refs or performed a GC ...

(By the way, does Squot honor the lock files of git?)

[j4yk]

(By the way, does Squot honor the lock files of git?)

I don't know. Probably not. If it does, then I didn't implement it.