DOCSLIB.ORG

Distributed Development with Bazaar

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Distributed Development with Bazaar Overview An extremely flexible tool Example: the management of ABINIT The end Distributed development with Bazaar Yann Pouillon 1. Facultad de Químicas, Universidad del País Vasco UPV/EHU, Donostia-San Sebastián, Spain. 2. European Theoretical Spectroscopy Facility (ETSF), Spain. CECAM Tutorial — Zaragoza, Spain 2010/06/21 Overview An extremely flexible tool Example: the management of ABINIT The end Outline 1 Overview An evolutionary process Quick tour of Bazaar 2.1 2 An extremely flexible tool Keeping up with an evolving project Popular Bazaar workflows 3 Example: the management of ABINIT Sustaining the growth of the code The ABINIT Forge Overview An extremely flexible tool Example: the management of ABINIT The end Outline 1 Overview An evolutionary process Quick tour of Bazaar 2.1 2 An extremely flexible tool Keeping up with an evolving project Popular Bazaar workflows 3 Example: the management of ABINIT Sustaining the growth of the code The ABINIT Forge Overview An extremely flexible tool Example: the management of ABINIT The end Different times, different challenges, different models 1970’s: first steps (SCCS times) VCS = tool to keep history of single files weave method: uniform data retrieval time outcome: SCCS adopted by Unix 1980’s: from solo to team work (RCS times) independent streams of development project management & VCS decoupled outcome: data retrieval efficiency & reliability 1990’s: organizing collaboration (CVS times) golden age of client-server model uprising of the centralized model outcome: atomicity, file management, deployment 2000’s: going back to freedom emergence of the distributed model explosion of "ecological diversity" outcome: better flexibility, usability & scaling Overview An extremely flexible tool Example: the management of ABINIT The end Different times, different challenges, different models 1970’s: first steps (SCCS times) VCS = tool to keep history of single files weave method: uniform data retrieval time outcome: SCCS adopted by Unix 1980’s: from solo to team work (RCS times) independent streams of development project management & VCS decoupled outcome: data retrieval efficiency & reliability 1990’s: organizing collaboration (CVS times) golden age of client-server model uprising of the centralized model outcome: atomicity, file management, deployment 2000’s: going back to freedom emergence of the distributed model explosion of "ecological diversity" outcome: better flexibility, usability & scaling Overview An extremely flexible tool Example: the management of ABINIT The end Different times, different challenges, different models 1970’s: first steps (SCCS times) VCS = tool to keep history of single files weave method: uniform data retrieval time outcome: SCCS adopted by Unix 1980’s: from solo to team work (RCS times) independent streams of development project management & VCS decoupled outcome: data retrieval efficiency & reliability 1990’s: organizing collaboration (CVS times) golden age of client-server model uprising of the centralized model outcome: atomicity, file management, deployment 2000’s: going back to freedom emergence of the distributed model explosion of "ecological diversity" outcome: better flexibility, usability & scaling Overview An extremely flexible tool Example: the management of ABINIT The end Different times, different challenges, different models 1970’s: first steps (SCCS times) VCS = tool to keep history of single files weave method: uniform data retrieval time outcome: SCCS adopted by Unix 1980’s: from solo to team work (RCS times) independent streams of development project management & VCS decoupled outcome: data retrieval efficiency & reliability 1990’s: organizing collaboration (CVS times) golden age of client-server model uprising of the centralized model outcome: atomicity, file management, deployment 2000’s: going back to freedom emergence of the distributed model explosion of "ecological diversity" outcome: better flexibility, usability & scaling Overview An extremely flexible tool Example: the management of ABINIT The end The centralized model Strength: control Individualistic (driving force = project leader) Requires a server Requires permanent connection to the server Snapshotting & publishing tightly bound Associated social model: benevolent dictatorship Subversion: "subvert the beast" Since 2000: overcome CVS limits while keeping compatibility Today: probably the most popular for the centralized model Reason: smooth transition from CVS Overview An extremely flexible tool Example: the management of ABINIT The end The centralized model Strength: control Individualistic (driving force = project leader) Requires a server Requires permanent connection to the server Snapshotting & publishing tightly bound Associated social model: benevolent dictatorship Subversion: "subvert the beast" Since 2000: overcome CVS limits while keeping compatibility Today: probably the most popular for the centralized model Reason: smooth transition from CVS Overview An extremely flexible tool Example: the management of ABINIT The end The centralized model Strength: control Individualistic (driving force = project leader) Requires a server Requires permanent connection to the server Snapshotting & publishing tightly bound Associated social model: benevolent dictatorship Subversion: "subvert the beast" Since 2000: overcome CVS limits while keeping compatibility Today: probably the most popular for the centralized model Reason: smooth transition from CVS Overview An extremely flexible tool Example: the management of ABINIT The end The distributed model Strength: freedom & autonomy Team-oriented (driving force = community) Exploration of new concepts made easy (no loss of history) Network access: only to publish or access remote changes Associated social model: doocracy the actual developers take the decisions dynamical reorganization, delegation of powers mostly bottom-up structure Bazaar: "VCS for Human Beings" "Just a tool" philosophy + bindings to other VCS’s Overview An extremely flexible tool Example: the management of ABINIT The end The distributed model Strength: freedom & autonomy Team-oriented (driving force = community) Exploration of new concepts made easy (no loss of history) Network access: only to publish or access remote changes Associated social model: doocracy the actual developers take the decisions dynamical reorganization, delegation of powers mostly bottom-up structure Bazaar: "VCS for Human Beings" "Just a tool" philosophy + bindings to other VCS’s Overview An extremely flexible tool Example: the management of ABINIT The end The distributed model Strength: freedom & autonomy Team-oriented (driving force = community) Exploration of new concepts made easy (no loss of history) Network access: only to publish or access remote changes Associated social model: doocracy the actual developers take the decisions dynamical reorganization, delegation of powers mostly bottom-up structure Bazaar: "VCS for Human Beings" "Just a tool" philosophy + bindings to other VCS’s Overview An extremely flexible tool Example: the management of ABINIT The end Centralized vs. distributed: a false debate Former bone of contention Patch bomb = unmanageable contribution Distributed model: no protection Centralized model: just more difficult Patch bomb = social failure =⇒ no technical solution Importance of fluid communication Interplay between social & technical aspects Centralized model popular for historical reasons Balance between control & freedom: YOU choose! Reminder: CVS = beast of SVN −→ SVN = beast of other tools Overview An extremely flexible tool Example: the management of ABINIT The end Centralized vs. distributed: a false debate Former bone of contention Patch bomb = unmanageable contribution Distributed model: no protection Centralized model: just more difficult Patch bomb = social failure =⇒ no technical solution Importance of fluid communication Interplay between social & technical aspects Centralized model popular for historical reasons Balance between control & freedom: YOU choose! Reminder: CVS = beast of SVN −→ SVN = beast of other tools Overview An extremely flexible tool Example: the management of ABINIT The end In conclusion ... Do not feed the troll! Overview An extremely flexible tool Example: the management of ABINIT The end Outline 1 Overview An evolutionary process Quick tour of Bazaar 2.1 2 An extremely flexible tool Keeping up with an evolving project Popular Bazaar workflows 3 Example: the management of ABINIT Sustaining the growth of the code The ABINIT Forge Overview An extremely flexible tool Example: the management of ABINIT The end Main objectives of Bazaar Usability: "DVCS for Human Beings" (Ubuntu philosophy) Portability: only requires Python ≥ 2.4 Efficiency: smart support for renaming files & directories optimal use of disk space minimal overhead (fast branching & merging) Productivity: "just a tool" (read the documentation) Extensibility: Python plugins & well-documented API Pluggability: suitable for embedded systems Safety: strong & active open-source community test suite with > 10,000 automatic tests Freedom: Bazaar is Free Software (GPLv2+) Overview An extremely flexible tool Example: the management of ABINIT The end Bazaar core concepts Revision: snapshot of the state of a file tree Branch: ordered series of revisions Repository: store of revisions (branches sharing history) Working Tree: version-controlled directory holding source Checkout: source tree remotely connected to a branch Standalone Tree: independent branch with working tree Branching: action of splitting development lines Merging:
Load more

Recommended publications
  • GIT—A Stupid Content Tracker
    GIT—A Stupid Content Tracker Junio C. Hamano Twin Sun, Inc. [email protected] Abstract The paper gives an overview of how git evolved and discusses the strengths and weaknesses of its design. Git was hurriedly hacked together by Linus Torvalds, after the Linux kernel project lost its license to use BitKeeper as its source code management system (SCM). It has since 1 Low level design quickly grown to become capable of managing the Linux kernel project source code. Other projects have started to replace their existing Git is a “stupid content tracker.” It is designed SCMs with it. to record and compare the whole tree states ef- ficiently. Unlike traditional source code control Among interesting things that it does are: systems, its data structures are not geared to- ward recording changes between revisions, but for making it efficient to retrieve the state of in- 1. giving a quick whole-tree diff, dividual revisions. 2. quick, simple, stupid-but-safe merge, The unit in git storage is an object. It records: 3. facilitating e-mail based patch exchange workflow, and • blob – the contents of a file (either the 4. helping to pin-point the change that caused contents of a regular file, or the path a particular bug by a bisection search in pointed at by a symbolic link). the development history. • tree – the contents of a directory, by recording the mapping from names to ob- The core git functionality is implemented as a jects (either a blob object or a tree object set of programs to allow higher-layer systems that represents a subdirectory).
    [Show full text]
  • Bazaar, Das DVCS
    Bazaar, das DVCS Marek Kubica 20. November 2008 Marek Kubica Bazaar, das DVCS Vorweg ein paar Infos Mit was ich so spiele Bazaar in der Arbeit Mercurial für Python-Projekte Git für den Rest Welche Spielzeuge lass ich links liegen CVS wozu noch wo es SVN gibt? SVN wozu noch wenn es DVCS gibt? darcs lohnt sich nicht mehr monotone, codeville, arch obsolete das selbsgehackte, tolle DVCS deines Nachbarn ;) Marek Kubica Bazaar, das DVCS Geschichte In the beginning, there was GNU Arch Marek Kubica Bazaar, das DVCS GNU Arch Die Anfänge von DVCS CVS stinkt, wir brauchen was besseres SVN ist Evolution, keine Revolution GNU Arch war das erste DVCS mit dem ich in Kontakt kam (larch) fürchterlich kompliziert wurde dann von tla ersetzt immer noch fürchterlich Canonical hat tla 1.2 geforkt und Bazaar, baz genannt Paralell dazu: revc = Arch 2.0 Marek Kubica Bazaar, das DVCS Baz als Rettung? Von heiÿen Kartoeln baz war in C Was passiert: Canonical ruft Bazaar-NG ins Leben, bzr, lässt baz fallen Bazaar-NG wird in Bazaar umgetauft baz ist tot, tla ist tot, larch ist tot, revc ist bedeutungslos Hurra, GNU Arch ist endlich tot, es lebe bzr! Marek Kubica Bazaar, das DVCS bzr, der Retter Was bietet Bazaar? in Python geschrieben, mit einigen Speedups in Pyrex (C) reguläre Releases (quasi jeden Monat) Einfache Bedienung Meist ausreichende Performance Umfangreiche Dokumentation: Programmmeldungen, Manpages, Wiki, IRC-Channel (wenn man Geduld hat) Flexible Einsatzmöglichkeiten (verschiedene Workows) 1 Git mit Bazaar simulieren 2 SVN in Bazaar nachbauen (für Nostalgiker) freier Hoster wo man Code hochladen kann (Launchpad) Marek Kubica Bazaar, das DVCS Zeitleiste 2005 war eine aufregende Zeit 26.
    [Show full text]
  • Analysis and Comparison of Distributed Version Control Systems
    Fachhochschul-Bachelorstudiengang SOFTWARE ENGINEERING A-4232 Hagenberg, Austria Analysis and Comparison of Distributed Version Control Systems Bachelorarbeit Teil 1 zur Erlangung des akademischen Grades Bachelor of Science in Engineering Eingereicht von Daniel Knittl-Frank Begutachter: DI Dr. Stefan Wagner Hagenberg, Juni 2010 Contents Abstract iii Kurzfassung iv 1 Introduction1 1.1 Motivation............................1 1.2 Goals...............................2 1.3 Content..............................2 2 Version Control in General3 2.1 Workflows.............................4 2.2 Foundations............................5 2.2.1 Glossary..........................5 2.2.2 Repository........................6 2.2.3 Working Directory....................7 2.2.4 Diff and Patch......................7 2.2.5 Merge...........................9 2.2.6 Mainline, Branches and Tags.............. 12 3 Centralized Version Control 14 3.1 Tools................................ 14 3.1.1 CVS............................ 14 3.1.2 Subversion........................ 15 4 Distributed Version Control 17 4.1 Differences............................. 17 4.2 Concepts............................. 19 4.2.1 Revision identifiers.................... 20 4.2.2 Integrity.......................... 20 4.2.3 History representation.................. 21 4.3 Tools................................ 21 4.3.1 Bazaar........................... 22 4.3.2 Git............................. 27 4.3.3 Mercurial......................... 32 i Contents ii 5 Comparison 38 5.1 Testing Scenario......................... 38 5.2 Results............................... 38 6 Conclusion 46 Abstract Version and configuration control systems have played an essential role in software development for the last decades. Starting with the new millennium a new trend surfaced, distributed version control: dedicated central servers for few authorized users lose importance in favor of a more dynamic workflow, in which every developer works with a copy of a project's complete history and changes are synchronized ad-hoc between developers.
    [Show full text]
  • This Book Doesn't Tell You How to Write Faster Code, Or How to Write Code with Fewer Memory Leaks, Or Even How to Debug Code at All
    Practical Development Environments By Matthew B. Doar ............................................... Publisher: O'Reilly Pub Date: September 2005 ISBN: 0-596-00796-5 Pages: 328 Table of Contents | Index This book doesn't tell you how to write faster code, or how to write code with fewer memory leaks, or even how to debug code at all. What it does tell you is how to build your product in better ways, how to keep track of the code that you write, and how to track the bugs in your code. Plus some more things you'll wish you had known before starting a project. Practical Development Environments is a guide, a collection of advice about real development environments for small to medium-sized projects and groups. Each of the chapters considers a different kind of tool - tools for tracking versions of files, build tools, testing tools, bug-tracking tools, tools for creating documentation, and tools for creating packaged releases. Each chapter discusses what you should look for in that kind of tool and what to avoid, and also describes some good ideas, bad ideas, and annoying experiences for each area. Specific instances of each type of tool are described in enough detail so that you can decide which ones you want to investigate further. Developers want to write code, not maintain makefiles. Writers want to write content instead of manage templates. IT provides machines, but doesn't have time to maintain all the different tools. Managers want the product to move smoothly from development to release, and are interested in tools to help this happen more often.
    [Show full text]
  • Linux-Cookbook.Pdf
    LINUX COOKBOOK ™ Other Linux resources from O’Reilly Related titles Linux Device Drivers Exploring the JDS Linux Linux in a Nutshell Desktop Running Linux Learning Red Hat Enterprise Building Embedded Linux Linux and Fedora Systems Linux Pocket Guide Linux Security Cookbook Understanding the Linux Kernel Linux Books linux.oreilly.com is a complete catalog of O’Reilly’s books on Resource Center Linux and Unix and related technologies, including sample chapters and code examples. ONLamp.com is the premier site for the open source web plat- form: Linux, Apache, MySQL, and either Perl, Python, or PHP. Conferences O’Reilly brings diverse innovators together to nurture the ideas that spark revolutionary industries. We specialize in document- ing the latest tools and systems, translating the innovator’s knowledge into useful skills for those in the trenches. Visit conferences.oreilly.com for our upcoming events. Safari Bookshelf (safari.oreilly.com) is the premier online refer- ence library for programmers and IT professionals. Conduct searches across more than 1,000 books. Subscribers can zero in on answers to time-critical questions in a matter of seconds. Read the books on your Bookshelf from cover to cover or sim- ply flip to the page you need. Try it today with a free trial. LINUX COOKBOOK ™ Carla Schroder Beijing • Cambridge • Farnham • Köln • Paris • Sebastopol • Taipei • Tokyo Linux Cookbook™ by Carla Schroder Copyright © 2005 O’Reilly Media, Inc. All rights reserved. Printed in the United States of America. Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O’Reilly books may be purchased for educational, business, or sales promotional use.
    [Show full text]
  • SCM: a Look at Scons and GNU Arch
    SCM: A look at SCons and GNU Arch ¡ ¢ £ ¤ ¥ Ben Leslie ¦ § ¡ ¨ © ¢ § ¨ ¡ © ¨ © 1 WHAT IS SCM? CM is the discpline of controlling the evolution of complex systems; SCM is its specialization for computer programs and associated documents WHAT IS SCM? 2 WHAT IS SCM? CM is the discpline of controlling the evolution of complex systems; SCM is its specialization for computer programs and associated documents No really, what is it ? WHAT IS SCM? 2-A WHAT IS SCM? CM is the discpline of controlling the evolution of complex systems; SCM is its specialization for computer programs and associated documents No really, what is it ? • Versioning WHAT IS SCM? 2-B WHAT IS SCM? CM is the discpline of controlling the evolution of complex systems; SCM is its specialization for computer programs and associated documents No really, what is it ? • Versioning • Building WHAT IS SCM? 2-C BUILD SYSTEM – PURPOSE Automate construction process • Build rules – how to change .c into .o • Capture all build rules Rebuild exactly what is needed BUILD SYSTEM – PURPOSE 3 BUILD SYSTEM – PURPOSE Automate construction process • Build rules – how to change .c into .o • Capture all build rules Rebuild exactly what is needed • Build everything required – correctness. BUILD SYSTEM – PURPOSE 3-A BUILD SYSTEM – PURPOSE Automate construction process • Build rules – how to change .c into .o • Capture all build rules Rebuild exactly what is needed • Build everything required – correctness. • Don’t build anymore then needed – performance. BUILD SYSTEM – PURPOSE 3-B BUILD SYSTEM – PURPOSE Automate construction process • Build rules – how to change .c into .o • Capture all build rules Rebuild exactly what is needed • Build everything required – correctness.
    [Show full text]
  • Git and Gerrit in Action and Lessons Learned Along the Path to Distributed Version Control
    Git and Gerrit in Action And lessons learned along the path to distributed version control Chris Aniszczyk (Red Hat) Principal Software Engineer [email protected] http://aniszczyk.org About Me I've been using and hacking open source for ~12 years - contribute{d} to Gentoo Linux, Fedora Linux, Eclipse Hack on Eclipse, Git and other things at Red Hat Member of the Eclipse Board of Directors Member in the Eclipse Architecture Council I like to run! (2 mins short of Boston qualifying ;/) Co-author of RCP Book (www.eclipsercp.org) An Introduction to Git and Gerrit | © 2011 by Chris Aniszczyk Agenda History of Version Control (VCS) The Rise of Distributed Version Control (DVCS) Code Review with Git and Gerrit Lessons Learned at Eclipse moving to a DVCS Conclusion Q&A An Introduction to Git and Gerrit | © 2011 by Chris Aniszczyk Version Control Version Control Systems manage change “The only constant is change” (Heraclitus) An Introduction to Git and Gerrit | © 2011 by Chris Aniszczyk Why Version Control? VCS became essential to software development because: They allow teams to collaborate They manage change and allow for inspection They track ownership They track evolution of changes They allow for branching They allow for continuous integration An Introduction to Git and Gerrit | © 2011 by Chris Aniszczyk Version Control: The Ancients 1972 – Source Code Control System (SCCS) Born out of Bell Labs, based on interleaved deltas No open source implementations as far as I know 1982 – Revision Control System (RCS) Released as an alternative to SCCS
    [Show full text]
  • A Technical Summary
    A Technical Summary Table A.1. Kerberos administrative ACL (MIT) Allow Deny Operation a A Add principals or policies d D Delete principals or policies m M Modify principals or policies c C Change passwords i I Inquiry the database l L List principals or policies s S Set key for principals * or x Allow all privileges Table A.2. Kerberos kadmin password policies (MIT) Option Meaning -history Minimum count of unusable old passwords -maxlife Maximum allowed lifetime -minclasses Minimum character classes -minlength Minimum password length -minlife Minimum lifetime 380 A Technical Summary Table A.3. LDAP access control list levels Level Privilege Coding Explanation none =0 No access at all auth =x Permits authentication attempt compare =cx Permits comparison search =scx Permits search filter application read =rscx Permits search result inspection write =wrscx Permits modification or deletion Table A.4. The OpenAFS access control list attributes Permission Meaning l List contents (lookup) i Create new files or directories (insert) d Delete files or directories a Change ACL attributes of directories (administer) r Read contents of files w Modify contents of files (write) k Lock files for reading read Equivalent to rl write Equivalent to rlidwk (no administrative rights) all Equivalent to rlidwka none Remove all ACL permissions Table A.5. The OpenAFS @sys names (excerpt) @sys Architecture alpha dux40 Digital UNIX 4 on an Alpha alpha dux50 Digital UNIX 5 on an Alpha i386 linux24 Linux Kernel 2.4 on Intel and compatible i386 linux26 Linux Kernel 2.6 on Intel and compatible i386 nt40 Microsoft Windows NT and later on Intel and compatible ppc darwin70 Apple MacOS X 10.3 on a PowerPC Macintosh ppc darwin80 Apple MacOS X 10.4 on a PowerPC Macintosh ppc darwin90 Apple MacOS X 10.5 on a PowerPC Macintosh rs aix52 IBM AIX 5.2 on a pSeries rs aix53 IBM AIX 5.3 on a pSeries sgi 65 SGI Irix 6.5 on a MPIS x86 darwin80 Apple MacOS X 10.4 on an Intel Macintosh x86 darwin90 Apple MacOS X 10.5 on an Intel Macintosh A Technical Summary 381 Table A.6.
    [Show full text]
  • David's Advanced Revision Control System
    Hazırlık Darcs Hakkında Pratik Okuma Odevi¨ David’s Advanced Revision Control System Can Burak C¸ilingir1 1Istanbul˙ Bilgi Universitesi¨ Bilgisayar Bilimleri B¨ol¨um¨u [email protected] 5 S¸ubat 2007 Can Burak C¸ilingir Darcs Hazırlık Darcs Hakkında Versiyon Y¨onetimi Pratik Ge¸cmi¸s Okuma Odevi¨ Ne zaman bitecek? 1 Hazırlık Versiyon Y¨onetimi Ge¸cmi¸s 2 Darcs Hakkında 3 Pratik 4 Okuma Odevi¨ Can Burak C¸ilingir Darcs Hazırlık Darcs Hakkında Versiyon Y¨onetimi Pratik Ge¸cmi¸s Okuma Odevi¨ neye yarar? Can Burak C¸ilingir Darcs Hazırlık Darcs Hakkında Versiyon Y¨onetimi Pratik Ge¸cmi¸s Okuma Odevi¨ Aegis, ArX, Arch, BitKeeper, CM Synergy, CVS, Code Co-Op, Codeville, IBM Rational ClearCase, Mercurial, Monotone, OpenCM Perforce, PureCM, RCS, Subversion, Superversion, Vesta, Visual SourceSafe, bazaar-ng, git, monotone, svk http://better-scm.berlios.de/comparison/ http://zooko.com/revision control quick ref.html Can Burak C¸ilingir Darcs Hazırlık Darcs Hakkında Versiyon Y¨onetimi Pratik Ge¸cmi¸s Okuma Odevi¨ Aegis, ArX, Arch, BitKeeper, CM Synergy, CVS, Code Co-Op, Codeville, IBM Rational ClearCase, Mercurial, Monotone, OpenCM Perforce, PureCM, RCS, Subversion, Superversion, Vesta, Visual SourceSafe, bazaar-ng, git, monotone, svk http://better-scm.berlios.de/comparison/ http://zooko.com/revision control quick ref.html Can Burak C¸ilingir Darcs Hazırlık Darcs Hakkında Versiyon Y¨onetimi Pratik Ge¸cmi¸s Okuma Odevi¨ rcs Revision Control System, tek ki¸si cvs Concurrent Versioning System, birden fazla ki¸si svn Subversion, daha d¨uzg¨un
    [Show full text]
  • Storage Tradeoffs in a Collaborative Backup Service for Mobile Devices Ludovic Courtès, Marc-Olivier Killijian, David Powell
    Storage Tradeoffs in a Collaborative Backup Service for Mobile Devices Ludovic Courtès, Marc-Olivier Killijian, David Powell To cite this version: Ludovic Courtès, Marc-Olivier Killijian, David Powell. Storage Tradeoffs in a Collaborative Backup Service for Mobile Devices. 2006. hal-00187069 HAL Id: hal-00187069 https://hal.archives-ouvertes.fr/hal-00187069 Preprint submitted on 13 Nov 2007 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Storage Tradeoffs in a Collaborative Backup Service for Mobile Devices† Ludovic Courtès Marc-Olivier Killijian David Powell fi[email protected] LAAS-CNRS 7 avenue du Colonel Roche 31077 Toulouse cedex 4 France Abstract Our goal is to leverage the ubiquity of communicat- ing mobile devices to implement a collaborative backup service. In such a system,devices participating in the ser- Mobile devices are increasingly relied on but are vice would be able to use other devices’storage to back used in contexts that put them at risk of physical dam- up their own data. Of course, each device would have to age, loss or theft. We consider a fault-tolerance ap- contribute some of its own storage resources for others proach that exploits spontaneous interactions to imple- to be able to benefit from the service.
    [Show full text]
  • Storage Tradeoffs in a Collaborative Backup Service for Mobile Devices Ludovic Courtès, Marc-Olivier Killijian, David Powell
    Storage Tradeoffs in a Collaborative Backup Service for Mobile Devices Ludovic Courtès, Marc-Olivier Killijian, David Powell To cite this version: Ludovic Courtès, Marc-Olivier Killijian, David Powell. Storage Tradeoffs in a Collaborative Backup Service for Mobile Devices. 2006. hal-00187069 HAL Id: hal-00187069 https://hal.archives-ouvertes.fr/hal-00187069 Preprint submitted on 13 Nov 2007 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Storage Tradeoffs in a Collaborative Backup Service for Mobile Devices† Ludovic Courtès Marc-Olivier Killijian David Powell fi[email protected] LAAS-CNRS 7 avenue du Colonel Roche 31077 Toulouse cedex 4 France Abstract Our goal is to leverage the ubiquity of communicat- ing mobile devices to implement a collaborative backup service. In such a system,devices participating in the ser- Mobile devices are increasingly relied on but are vice would be able to use other devices’storage to back used in contexts that put them at risk of physical dam- up their own data. Of course, each device would have to age, loss or theft. We consider a fault-tolerance ap- contribute some of its own storage resources for others proach that exploits spontaneous interactions to imple- to be able to benefit from the service.
    [Show full text]
  • Bill Laboon Friendly Introduction Version Control: a Brief History
    Git and GitHub: A Bill Laboon Friendly Introduction Version Control: A Brief History ❖ In the old days, you could make a copy of your code at a certain point, and release it ❖ You could then continue working on your code, adding features, fixing bugs, etc. ❖ But this had several problems! VERSION 1 VERSION 2 Version Control: A Brief History ❖ Working with others was difficult - if you both modified the same file, it could be very difficult to fix! ❖ Reviewing changes from “Release n” to “Release n + 1” could be very time-consuming, if not impossible ❖ Modifying code locally meant that a crash could take out much of your work Version Control: A Brief History ❖ So now we have version control - a way to manage our source code in a regular way. ❖ We can tag releases without making a copy ❖ We can have numerous “save points” in case our modifications need to be unwound ❖ We can easily distribute our code across multiple machines ❖ We can easily merge work from different people to the same codebase Version Control ❖ There are many kinds of version control out there: ❖ BitKeeper, Perforce, Subversion, Visual SourceSafe, Mercurial, IBM ClearCase, AccuRev, AutoDesk Vault, Team Concert, Vesta, CVSNT, OpenCVS, Aegis, ArX, Darcs, Fossil, GNU Arch, BitKeeper, Code Co-Op, Plastic, StarTeam, MKS Integrity, Team Foundation Server, PVCS, DCVS, StarTeam, Veracity, Razor, Sun TeamWare, Code Co-Op, SVK, Fossil, Codeville, Bazaar…. ❖ But we will discuss git and its most popular repository hosting service, GitHub What is git? ❖ Developed by Linus Torvalds ❖ Strong support for distributed development ❖ Very fast ❖ Very efficient ❖ Very resistant against data corruption ❖ Makes branching and merging easy ❖ Can run over various protocols Git and GitHub ❖ git != GitHub ❖ git is the software itself - GitHub is just a place to store it, and some web-based tools to help with development.
    [Show full text]