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Diffstat (limited to 'git.org')
| -rw-r--r-- | git.org | 152 |
1 files changed, 152 insertions, 0 deletions
@@ -0,0 +1,152 @@ +* How dCVS is different +** Everything is implicitly a branch +The only ``central'' repository is the one you're in. Distribution of +changes is a separate command. This means every repository is an +inevitable branch of the first commit. + +** Merge becomes a required operation +Since everything is a branch, a history merge is required in order to +share changes up-or-downstream. + +** History is non-linear +No more monotonically increasing version numbers. Instead version +numbers must be crafted to at least identify the data of the commit +itself so they can be universally addressable. + +* Create a demo repo +** create + ~% mkdir sifl + ~% cd sifl + ~/sifl% git init + Initialized empty Git repository in /Users/bjc/Documents/git/sifl/.git/ + +** clone + ~/sifl% cd .. + ~% git clone sifl olly + Initialized empty Git repository in /Users/bjc/Documents/git/olly/.git/ + ~% cd olly + ~/olly% git remote show origin # Automatically set up and pointing to + # ../sifl + * remote origin + URL: ../sifl + +* Add some data +** sifl commands + ~% cd sifl + ~/sifl% echo sifl > whoami + ~/sifl% git add whoami; git commit -m "Set whoami to sifl." + [master (root-commit) b211a60] Set whoami to sifl. + 1 files changed, 1 insertions(+), 0 deletions(-) + create mode 100644 whoami + +** A moment on git refs +*** commit id +A git commit id includes a hash of the commit blob as well as a +reference to the commit's parent. In this way a given commit and its +history can be compared simply by checking the id. All other refs +inevitably point to a commit id as the fundamental unit. +*** HEAD +This is the commit the working copy is based off of. Upon commit this +will be used as the parent commit. +*** branch +A branch is a moving HEAD pointer. All working directories are +implicitly branches, although it's easier to use a named one. +*** tag +A tag is a commit id with an optional message and signature. + +** sifl commit history graph + + (b211a60) + + O + +** olly commands + ~/sifl% cd ../olly + ~/olly% echo olly > whoami + ~/sifl% git add whoami; git commit -m "Set whoami to olly." + [master (root-commit) 536a095] Set whoami to olly. + 1 files changed, 1 insertions(+), 0 deletions(-) + create mode 100644 whoami + +** olly commit history graph + + (536a095) + + O + +* Sharing changes +** sifl commands + ~% cd sifl + ~/sifl% git pull ../olly + warning: no common commits + remote: Counting objects: 3, done. + remote: Total 3 (delta 0), reused 0 (delta 0) + Unpacking objects: 100% (3/3), done. + From ../olly + * branch HEAD -> FETCH_HEAD + Auto-merging whoami + CONFLICT (add/add): Merge conflict in whoami + Automatic merge failed; fix conflicts and then commit the result. + [1] 16566 exit 1 git pull ../olly + ~/sifl% cat whoami + <<<<<<< HEAD:whoami + sifl + ======= + olly + >>>>>>> 536a095305749bacf3357e37eeb13676e8f9c4d0:whoami + ~/sifl% echo sifl > whoami; echo olly >> whoami + ~/sifl% git add whoami; git commit -m "Fix conflicts." + [master eb69ba9] Fix conflicts. + +** sifl commit history graph + + (b211a60) + + O ------- O (eb69ba9) + / + O -----/ + + (536a095) + +** merge commits + +* No semantic difference between branches and repositories +** repositories are just part of the ref +Repositories are implicitly branches, therefor, you can push and pull +to branches in local repositories, although it is a little silly. + +* Rewriting (some) history +** Rewrite as much as you want, but be careful +You can make your local history look however you want, but since git +commit ids include parent references as well as the commit itself, you +can make your repository look totally different from everyone else's, +making sharing changes difficult. + +** git complains under some circumstances for push and pull - elaborate + +** Reordering and merging patches +*** Why would you do this? +1. Need to get a feature out, but mixed in unwanted code. +2. Presenting a logical history +3. Segregating features for independant testing and acceptance. + +** Splitting patches w/ git-add --patch +** git rebase -i +** Using rebase with git-add --patch/git-reset to split changes + +* Screwing up your repo and fixing your changes +** git reflog +** git reset + +* Merge strategies +** fast-forward +** recursive +** octopus +** any more? +* Brief `git svn' overview +** Importing linear branches is straight-forward. +** Use `rebase' if you intend to use `dcommit.' +** SVN branches auto-tracked, just like master. + + + |