source code control - telemark university...
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SourceCodeControl
Hans-PetterHalvorsen,M.Sc.
QuizwithExplainations
Questions1. WhatisSCC?2. Listatleast5differentSSCSystems3. WhydoweneedaSCC/VersionControlSystem?4. WhatisDistributedVersionControlSystem(DVCS)?5. WhatisTFS?6. WhatismaindifferencesbetweenTFVC(Built-inVersion
ControlSysteminTFS)andGit?7. WhatisaBugTrackingSystem?8. ListdifferentBugTrackingSystems(atleast3)9. Whatdifferentsoftwarereleasesdowehave?10. Listatleast3centralizedSCCsystemsand3DVCSsystems
WhatisSCC?
SourceCodeControl/VersionControlWhatisit?• Aversioncontrolsystemkeepstrackofallworkandallchangesinasetoffiles(typicallyyourcodefiles,butalsootherfiles)
• Allowsseveraldevelopers(potentiallywidelyseparatedinspaceandtime)tocollaborate
• AllSoftwareDevelopersneedit!!
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TypicalSCCFeatures• Checkout,Checkin/Commit• Branching,Merging• FileLocking(avoidconcurrentaccess)• Label/Tag• Change/ChangeList• Conflict• Revision,Iteration
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SCCFeatures• Checkout,Checkin/Commit• Branching,Merging• FileLocking(avoidconcurrentaccess)• Label/Tag• Change/ChangeList/History• Conflict
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1.0
1.1 2.0Braching
Merging
WorkwithnewRelease
Label/Tagit
WorkwithBugFix
BugFixReleased
2.0Released etc.
BranchinginTFS:http://msdn.microsoft.com/en-us/library/ee782536.aspx
Listatleast5differentSSCSystems
SCCSystems
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ConcurrentVersioningSystem
SVN
• VisualStudioOnline(formerlyTeamFoundationServices)(www.visualstudio.com)– TFVCorGit
• GitHub (www.github.com)• Bitbucket (www.bitbucket.org)–MercurialorGit
Web-basedSCCHostingServices
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WhydoweneedaSCC/VersionControlSystem?
WhySCC?• Keepttrackofcodeandfilesfrommultipledevelopers,
becauseeachdevelopercreateasmallpartofthetotalsoftwaresolution,ormultipledevelopersworkonthesamepieceofcode
• Itisimportanttokeeptrackofdifferentversionsofthesamefiles,e.g.ifwehavemadesomemistakesandweneedanolderversionofthesamecode.
• Wecouldalsocreatedifferentbraches,e.gonebrancforCustomer1andanotherbranchforCustomer2,andmaybeatsomepointweneedtomerrgethosetwointoonproduct.
WhatisDistributedVersionControlSystem(DVCS)?
DVCS- DistibutedVersionControlSystem• Withadistributedversioncontrolsystem,thereisn’tonecentralizedcodebase
topullthecodefrom.Differentbranchesholddifferentpartsofthecode.GitisaDVCS.Otherversioncontrolsystems,suchasSVNandCVS,usecentralizedversioncontrol,meaningthatonlyonemastercopyofthesoftwareisused.
• Peer-to-peerapproach
• Aserverstoresthecurrentversion(s)ofaprojectanditshistory,andclientsconnecttotheserverinorderto"checkout"acompletecopyoftheproject,workonthiscopyandthenlater"checkin"theirchanges
Centralized/Client–Serverarchitecture
Centralized/Client–Serverarchitecture
Repository
Network
Server
Client
Client Client
Client
Repository:SourceCodeDatabase
DistibutedVersionControlSystem
Repository
Repository
Repository
Repository
peer-to-peer peer-to-peer
Repository:SourceCodeDatabase
WhatisTFS?
TeamFoundationServer• SDLCManagement(SDLC– SoftwareDevelopmentLifeCycle)• SoftwareTeam Collaboration• SourceCodeManagement• SupportsAgile,Scrum,CMMI• IntegratedTest Tools• BugTrackingSystem• AutomatedBuilds• BuiltinTeamFoundationVersionControl(TSVC)+SupportforGit
repositories• Built-insupportforTFSinVisualStudio(TeamExplorer)• Plug-inforEclipse(TeamExplorerEverywhere)• MSSCCIProviderforotherIDEslikeLabVIEW,etc.
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WhatismaindifferencesbetweenTFVC(Built-inVersionControlSysteminTFS)
andGit?
TFSvs.Git• TeamFoundationVersionControl(TFVC)usesasingle,centralizedserverrepositorytotrackandversionfiles.Localchangesarealwayscheckedintothecentralserverwhereotherdeveloperscangetthelatestchanges.
• GitisaDistributedVersionControlSystem(DVCS)thatusesalocalrepositorytotrackandversionfiles.Changesaresharedwithotherdevelopersbypushingandpullingchangesthrougharemote,sharedrepository.
Git• Hasbecomeverypopulartoday• DistributedVersionControlSystem• InitiallydesignedanddevelopedbyLinusTorvalds(LinuxGuru)(2005)
• GitisFreeofuse• CVSandSVNiseasiertousethanGitforbeginners
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WhatisaBugTrackingSystem?
Bugs• Asoftwarebugisanerror,flaw,
failure,orfaultinacomputerprogramorsystemthatproducesanincorrectorunexpectedresult,orcausesittobehaveinunintendedways
• Theyfoundabug(actuallyamoth)insideacomputerin1947thatmadetheprogramnotbehavingasexpected.Thiswasthe“first”realbug.
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WhyFindBugsearly?
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SoftwareDevelopmentLifeCycle(SDLC)
Costperdefects
BugTrackingSystem• Keeptrackofbugsinsoftware.• Testers(orothers)canreportbugs,Developersand/orManagerscanprioritizethelistofbugs,etc.
• Youcanrelateaspesificbugtoaspesificrelease,etc.AllthesefeaturesarepartofaBugTrackingSystem.
ListdifferentBugTrackingSystems(atleast3)
BugTrackingSystems• TeamFoundationServer• Jira• Bugzilla• Clearquest• …
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Whatdifferentsoftwarereleasesdowehave?
SoftwareReleases
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Alpha Release
Beta Releases
RC (ReleaseCandidate)
RTM (ReleaseToManufacturing)
Note!othertermsarealsoused
Start
Finished
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Requirements/Design Alpha
Beta RCRTM
Furniture, Flowersandsmalladjustmentsmissing
Buildingstructurefinished,Insideworkon track
Foundation finished, building structurestartedPlansmadeandapproved
ReadyforSaleorMovein
A“proof”thatyoucando it,PoC(Proof ofConcept)
SoftwareReleasesBeforethesoftwareisreleased• Alpha Release(s)(Internalrelease,notpublic)• Beta Release(s)(“DeveloperPreview”,“ConsumerPreview”)• RC - ReleaseCandidate(s)(“ReleasePreview”)• RTM – ReleaseToManufactoringMaintenance(afterthesoftwareisreleased)• Patches (smallfixes)• SP - ServicePacks(lotsofsmallfixesandpathesbundletogether),
SP1,SP2,R1,R2,..…StartPlanningnextRelease
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Listatleast3centralizedSCCsystemsand3DVCSsystems
Centralized/Client–Cerverarchitecture
• TFS• CVS• SVN(Subversion)• LibreSource
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• Git• Mercurial• Bazaar• Monotone• BitKeeper
DVCS
References• SoftwareDevelopment- APracticalApproach
Halvorsen,Hans-Petter,2015• EssentialsofSoftwareEngineering
FrankTsui;OrlandoKaram;BarbaraBernal,3ed.,Jones&BartlettLearning
• SoftwareEngineeringI.Sommerville,10ed.:Pearson,2015
• SoftwareEngineering.ModernApproachesE.J.Braude andM.E.Bernstein,2ed.:Wiley,2011.
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Hans-PetterHalvorsen,M.Sc.
UniversityCollegeofSoutheastNorwaywww.usn.no
E-mail:[email protected]:http://home.hit.no/~hansha/