As I understood Chris, he tries to solve the following uniqueness problem:
you can generate distinct MCVersions that have the same name (by saving to
a local repository on different machines, for example). This produces
problems when you want to "push" both of these versions to a central
repository because of the way HTTP repositories (and others) depend on the
uniqueness of version names. Moreover it is confusing for the repository
maintainers because the ancestry of one version might refer to a version
that is not present in the repository, but a different version with the
same name *is* present in the repository, leading you to mistake one for
the other.

The two-laptops-with-a-local-repository use case is not the regular
Monticello workflow. That's why Levente says it happens way too
infrequently. But it is a realization of a truly distributed workflow that
Monticello should support.

In Git they say: everybody is on their own branch [even though everybody
may have checkout out "master"]. Actually, every cloned repository is on
its own branch... and the same applies to Monticello. Git does not suffer
from the same problem because it does not use consecutive version numbers.

Am Mo., 18. Feb. 2019 um 13:41 Uhr schrieb marcel.taeumel <
Marcel.Taeumel at hpi.de>:

> Hi, there.
>
> Can somebody please summarize the problem we want to solve (or address)
> here? I still don't understand it... :-( If "uniqueness" is the problem,
> just add this new number:
>
> Monticello-cmm.66240.685
>
> Best,
> Marcel
>
>
> commits-2 wrote
> > Chris Muller uploaded a new version of Monticello to project The Inbox:
> > http://source.squeak.org/inbox/Monticello-cmm.66240.mcz
> >
> > ==================== Summary ====================
> >
> > Name: Monticello-cmm.66240
> > Author: cmm
> > Time: 16 February 2019, 4:49:51.685281 pm
> > UUID: 435c7c35-3b22-4f66-b733-070ccd48a980
> > Ancestors: Monticello-eem.684
> >
> > Monticello only requires monotonicity and uniqueness for its version
> > numbers, not consecutiveness.  When saving a new package, generate a
> > unique, 6-digit versionNumber.  Beginning approximately
> > 2020-11-25T10:40:00+00:00, a 7th digit will appear -- no more than a
> local
> > phone number -- which will be good until year 2038.
> >
> > =============== Diff against Monticello-eem.684 ===============
> >
> > Item was added:
> > + ----- Method: MCAncestry>>hasAncestorNamed: (in category 'ancestry')
> > -----
> > + hasAncestorNamed: aString
> > +     self allAncestorsDo:
> > +             [ : each | aString asMCVersionName = each name ifTrue: [ ^
> true ] ].
> > +     ^ false!
> >
> > Item was added:
> > + ----- Method: MCVersionName class>>newVersionNameFor: (in category
> > 'utilities') -----
> > + newVersionNameFor: branchName
> > +     ^ branchName, '-' , Utilities authorInitials , '.' , self
> > newVersionNumberString!
> >
> > Item was added:
> > + ----- Method: MCVersionName class>>newVersionNumberString (in category
> > 'utilities') -----
> > + newVersionNumberString
> > +     "Answer a unique version number for use in generating the
> versionNumber
> > portion of my name."
> > +     ^ self versionNumberFor: DateAndTime now!
> >
> > Item was added:
> > + ----- Method: MCVersionName class>>versionNumberFor: (in category
> > 'private') -----
> > + versionNumberFor: aDateAndTime
> > +     "Answer a unique version number for use in generating the
> versionNumber
> > portion of my name."
> > +     | epoch |
> > +     epoch := '2019-01-01T00:00:00+00:00' asDateAndTime.
> > +     ^ (aDateAndTime - epoch) days * 24 * 60!
> >
> > Item was changed:
> >   MCPackageManager subclass: #MCWorkingCopy
> > +     instanceVariableNames: 'versionInfo ancestry repositoryGroup
> > requiredPackages environment'
> > -     instanceVariableNames: 'versionInfo ancestry counter
> repositoryGroup
> > requiredPackages environment'
> >       classVariableNames: ''
> >       poolDictionaries: ''
> >       category: 'Monticello-Versioning'!
> >
> > Item was changed:
> >   ----- Method: MCWorkingCopy>>nextVersionName (in category 'private')
> > -----
> >   nextVersionName
> >       | branch oldName |
> >       ancestry ancestors isEmpty
> >               ifTrue:
> > +                     [ branch := package name ]
> > -                     [ counter ifNil: [ counter := 0 ].
> > -                     branch := package name ]
> >               ifFalse:
> >                       [ oldName := ancestry ancestors first versionName.
> > +                     branch := oldName packageAndBranchName ].
> > +     ^ MCVersionName newVersionNameFor: branch!
> > -                     branch := oldName packageAndBranchName.
> > -                     counter ifNil:
> > -                             [ counter := (ancestry ancestors detectMax:
> > -                                     [ : eachVersionInfo |
> eachVersionInfo versionNumber ])
> > -                                     ifNil: [ 0 ]
> > -                                     ifNotNil:
> > -                                             [ : highestNumbered |
> highestNumbered versionNumber ] ] ].
> > -     counter := counter + 1.
> > -     ^ branch , '-' , Utilities authorInitials , '.' , counter asString!
> >
> > Item was changed:
> >   ----- Method: MCWorkingCopy>>uniqueVersionName (in category 'private')
> > -----
> >   uniqueVersionName
> >       |versionName|
> > -     counter := nil.
> >       [versionName := self nextVersionName.
> > +     (self repositoryGroup includesVersionNamed: versionName) or: [
> ancestry
> > hasAncestorNamed: versionName ]] whileTrue.
> > -     self repositoryGroup includesVersionNamed: versionName] whileTrue.
> >       ^ versionName!
>
>
>
>
>
> --
> Sent from: http://forum.world.st/Squeak-Dev-f45488.html
>
>
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