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Git for Android Developers
 

Git for Android Developers

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Talk given by Tony Hillerson at AnDevCon

Talk given by Tony Hillerson at AnDevCon

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    Git for Android Developers Git for Android Developers Presentation Transcript

    • Git For the Android Developer Tony Hillerson, AnDevCon Spring 2012 #AnDevCon @tackmobile @thillerson http://www.slideshare.net/thillerson/git-for-android-developersPRESENTATION ANDEVCON • MAY 14, 2012
    • About Me • Worked with Android and Git for a few years now • O’Reilly Screencaster: Developing Android Applications • http://training.oreilly.com/androidapps/ • http://training.oreilly.com/androidapps2/ • Tech Reviewer PRESENTATION tackmobile.com
    • Diving Right In Learning by DoingPRESENTATION ANDEVCON • MAY 14, 2012
    • git git or clone init git git commit 86650c185eda50c9f9d58e2fbdf8b7113e5dee54 changes add git git commit 6facfd9f34173f4fb024196996e948a87c85eb56 changes add git git commit b02ef5bf190e28ba24eab3ffab6133181cb5b5ef changes add ... ∞PRESENTATION tackmobile.com
    • .gitignore • Can be nested deeply • https://github.com/github/gitignore PRESENTATION tackmobile.com
    • Git Log - The Project’s History • What got committed? • Commit messages • Content • When? Who? PRESENTATION tackmobile.com
    • Remotes • remote add • clone • fetch • pull • push PRESENTATION tackmobile.com
    • Tagging git tag -a -m"Tagging v1.0" v1.0 c5083fa master fb4f5d9 c5083fa 3f43fa3 • Both “-v1.0” and c5083fa will point to c5083fa • Push this tag with `git push --tags` • Can be cryptologically signed PRESENTATION tackmobile.com
    • Recap of Simple Commands • git init - Creates an empty Git repository • git add - Adds a file to the stage (“stages a file”) • git rm - Removes from version control • git commit - Commits the staged changes to the (local) repository • git log - A view of the history • git tag - Names a commit • .gitignore - tells git to ignore certain files PRESENTATION tackmobile.com
    • Why Source Control? • For the solo developer? • Protection against mistakes • Freedom • ... to refactor • ... to experiment • For the development team? • All of the above, plus: • Parallel development • Merging different code branches PRESENTATION tackmobile.com
    • Preliminaries Getting Git and Getting Set UpPRESENTATION ANDEVCON • MAY 14, 2012
    • What’s a Git? A completely ignorant, childish person with no manners. - http://urbandictionary.com Linus Torvalds PRESENTATION http://en.wikipedia.org/wiki/Linus_Torvalds tackmobile.com
    • What’s a Git? Git is a free & open source, distributed version control system designed to handle everything from small to very large projects with speed and efficiency. - http://git-scm.com PRESENTATION tackmobile.com
    • Getting Set Up on Mac • Homebrew - http://mxcl.github.com/homebrew/ • brew install git • MacPorts - http://www.macports.org/ PRESENTATION tackmobile.com
    • Getting Set Up on Windows • msysgit -http://code.google.com/p/msysgit/ PRESENTATION tackmobile.com
    • Getting Set Up on Linux • apt, etc - you probably know the drill PRESENTATION tackmobile.com
    • Gooies! Git Tower - http://git-tower.com M • • Source Tree - Mac App Store A • Brother Bard’s GitX fork - http://brotherbard.com/blog/2010/03/experimental-gitx-fork/ C • Tortoise Git - http://code.google.com/p/tortoisegit/ W I N PRESENTATION tackmobile.com
    • Eclipse Integration • http://www.eclipse.org/egit/ PRESENTATION tackmobile.com
    • Reference • Git - http://git-scm.com/ • ProGit - http://progit.org/book/ - Scott Chacon • Insider Guide to Github - http://www.pragprog.com/screencasts/v-scgithub/insider-guide-to- github - Scott Chacon PRESENTATION tackmobile.com
    • The Command Line A Short SermonPRESENTATION ANDEVCON • MAY 14, 2012
    • The Guts of Git The Little Bits that Make Git DifferentPRESENTATION ANDEVCON • MAY 14, 2012
    • What’s With all the Characters? 86650c185eda50c9f9d58e2fbdf8b7113e5dee54 • SHA1 Hash • Uniquely identifies a commit • Secure - very unlikely that someone can tamper with content in a repository PRESENTATION tackmobile.com
    • SHA-1 Hash Keys “ ... to have a probability of a SHA1-hash collision rise to 1/2, you need about 10^24 objects ... - Scott Chacon in Pro Git (paraphrased) PRESENTATION tackmobile.com
    • In Git There Are Only... • Blobs • Trees • Commits PRESENTATION tackmobile.com
    • Blobs • The contents of your files are stored as binary files in .git/objects • Git is efficient. It only stores the same content once. • Identified by a SHA-1 • Show blob contents with e.g. git show c7fb9f5 PRESENTATION tackmobile.com
    • Trees • Trees give structure to blobs • Trees are also stored in .git/objects • Identified by SHA-1 • View a tree with ls-tree, e.g. `git ls-tree HEAD` PRESENTATION tackmobile.com
    • Commits• Identified by a SHA-1• Points to one tree• Has a required message• May have one (or more) parent commit(s)• Show the reachable commits from a commit: git rev-list HEAD PRESENTATION tackmobile.com
    • Refs • Point to commits • .git/refs/heads - the latest commits in local branches • HEAD - the latest commit on the current branch PRESENTATION tackmobile.com
    • Blobs Are Content b84ed8ed e8d5cf6 579a3b1 PRESENTATION tackmobile.com
    • Trees Give Structure 9899d2c b84ed8ed foo.txt 579a3b1 bar.txt e8d5cf6 baz.html trees can point 3ffb35b /images to other trees PRESENTATION tackmobile.com
    • Commits Point to Trees d414c3e 9899d2c “Updated the main activity” b84ed8ed foo.txt 579a3b1 bar.txt e8d5cf6 baz.html 3ffb35b /images PRESENTATION tackmobile.com
    • Commits Have Parents d414c3e “Updated the main activity” 090c953 “Fixed bug #42” 4493671 “Added RoboGuice” c1d1f60 “Initial commit” PRESENTATION tackmobile.com
    • Refs Point to Commits HEAD d414c3e “Updated the main activity” 090c953 “Fixed bug #42” 4493671 “Added RoboGuice” c1d1f60 “Initial commit” PRESENTATION tackmobile.com
    • And That’s All You Need To Know About GitPRESENTATION tackmobile.com
    • And That’s All You Need To Know About Git (Mostly)PRESENTATION tackmobile.com
    • Sweet Moves with Git Sweet, Sweet MovesPRESENTATION ANDEVCON • MAY 14, 2012
    • Interactive Add Building Semantic CommitsPRESENTATION ANDEVCON • MAY 14, 2012
    • Interactive Add - Building Semantic Commits • `git add` simply adds to the stage • `git commit -a` will commit all changes to tracked files (add and commit) • `git add -i` -- a command line tool to interactively add changes • Individual commits shouldn’t leave things broken • Try to commit some useful feature or bug fix all together PRESENTATION tackmobile.com
    • Amending A Commit Fix the Last CommitPRESENTATION ANDEVCON • MAY 14, 2012
    • git commit --amend • Oops! I misspelled something in the commit message • Oops! I did `git commit -a` and forgot to `git add` a file • Oops! I just committed a bug • USE ONLY BEFORE YOU SHARE CHANGES PRESENTATION tackmobile.com
    • Git Revert More Like Git ReversePRESENTATION ANDEVCON • MAY 14, 2012
    • git revert • Commits the reverse of a commit • The previous commit is still there • != svn revert PRESENTATION tackmobile.com
    • Git Stash Like a Little Repo In Your RepoPRESENTATION ANDEVCON • MAY 14, 2012
    • git stash • remember: git help stash • Stash away changes in a safe place PRESENTATION tackmobile.com
    • Branching Hitting Save Before You Fight the Level BossPRESENTATION ANDEVCON • MAY 14, 2012
    • Branching • checkout -b • merging • rebasing PRESENTATION tackmobile.com
    • How To Think About Branching • Mainline • What do you want “master” to mean? • Topic Branches • Branching examples PRESENTATION tackmobile.com
    • Topic Branches • Branching is about controlling feature sets • Make a new branch for a story • Make a new branch for a bug fix • Make a new branch to spike something PRESENTATION tackmobile.com
    • Team Branching Strategies • What do you want “master” to mean? • Keep master deployable? • one strategy for web software • Use “master” as an integration branch? • Each developer uses topic branches and integrates to master • Make a branch for releases PRESENTATION tackmobile.com
    • Branching git checkout -b add_login_activity master fb4f5d9 c5083fa add_login_activity 9aa8827 fe594ce ccb6f5e PRESENTATION tackmobile.com
    • Branching: Merging git checkout master git merge add_login_activity master 9aa8827 fe594ce ccb6f5e fb4f5d9 c5083fa 3f43fa3 add_login_activity 9aa8827 fe594ce ccb6f5e PRESENTATION tackmobile.com
    • Branching: Rebasing master fb4f5d9 c5083fa 3f43fa3 add_login_activity before 9aa8827 fe594ce ccb6f5e master fb4f5d9 c5083fa 3f43fa3 add_login_activity after 9aa8827 fe594ce ccb6f5e `git rebase master` PRESENTATION tackmobile.com
    • Branching: Rebasing • Better than merging in some ways... • Don’t use if you’ve pushed your branch to a remote • Can override with `git push -force` PRESENTATION tackmobile.com
    • Git Pull --rebase • Also available: `git pull --rebase` • Helpful for avoiding merge commits • May cause problems if git can’t automatically merge • `git reset HEAD` and start over with normal `git pull` PRESENTATION tackmobile.com
    • Cherry Pick I’ll Take One Of Those... And One Of Those...PRESENTATION ANDEVCON • MAY 14, 2012
    • Cherry-pick git cherry-pick fe594ce A new commit with master the changes from fe594ce fb4f5d9 c5083fa 3f43fa3 add_login_activity 9aa8827 fe594ce ccb6f5e PRESENTATION tackmobile.com
    • Interactive Rebase Rewrite HistoryPRESENTATION ANDEVCON • MAY 14, 2012
    • Interactive Rebase - Fixing History • git rebase -i [commit] • A list of all commits in the current order • Reorder • Fix a certain commit • Squash commits together • Delete commits • DON’T USE AFTER YOU’VE PUSHED PRESENTATION tackmobile.com
    • Whoops! Lots Of Ways To Fix ItPRESENTATION ANDEVCON • MAY 14, 2012
    • git checkout • `git checkout [filename]` = remove all unstaged changes PRESENTATION tackmobile.com
    • git reset • `git reset [filename]` = opposite of `git add [filename]` • `git reset HEAD` = same as above - acts on all changes • `git reset HEAD^` (also ^^, or ~1, ~42, etc.) = rollback commits to working tree • All examples of “mixed” reset PRESENTATION tackmobile.com
    • git reset soft • git reset --soft [commit] • Moves HEAD to commit • Puts the “popped” contents on the index PRESENTATION tackmobile.com
    • git reset mixed (default) • git reset [commit] • Moves HEAD to commit • Puts the “popped” contents on the index • Moves the index to the working tree as changes PRESENTATION tackmobile.com
    • git reset hard • git reset --hard [commit] • Moves HEAD to commit • Puts the “popped” contents on the index • Moves the index to the working tree as changes • Makes the working tree look like the index • DESTRUCTIVE PRESENTATION tackmobile.com
    • git reset use cases • Back that last commit up (git reset HEAD^) • Don’t forget `commit --amend` • Oops, didn’t mean to commit that file • I meant that commit to be on a branch! PRESENTATION tackmobile.com
    • The Take Home • SCM Is Important • No matter what kind of developer you are • Git is fundamentally different from the others • It’s not a database of patches • It’s a history of filesystem snapshots • It gives you freedom to innovate, make mistakes, and collaborate. PRESENTATION tackmobile.com
    • Thank you! #AnDevCon @tackmobile @thillerson http://github.com/thillerson http://slideshare.com/thillerson For the Android Developer • Tony Hillerson • AnDevCon Spring 2012PRESENTATION tackmobile.com