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La théorie des graphes appliquée à Git
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ubermuda
April 17, 2017
Technology
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La théorie des graphes appliquée à Git
ubermuda
April 17, 2017
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Transcript
La théorie des graphes appliquée à git Geoffrey Bachelet @ubermuda
Königsberg
ez pz Leonhard Euler
None
Pont Masse de terre
Arête Noeud graphe
1 2 3 4
None
A B E D C
A B E D C Noeuds
A B E C Arêtes D
A B E D C Graph orienté
A B E D C Graph orienté
None
Atteignabilité
Atteignabilité C est atteignable depuis E A B E D
C
Atteignabilité NOPE A B E D C
A B D E C F D n'est pas atteignable
depuis F Atteignabilité
Atteignabilité
None
$ git branch * master $ ls .git/refs/heads/ master $
cat .git/refs/heads/master 58bd01cded7904f1596cb12aac1d3e0e8ae6b558
$ git log --format="%H" 6465a2cd4d6d3b0a0a62588eeb5b798bb7d31a71 7d1d4dabc49854a0807200361731446476565094 17a59ceda9b2806e2a135df039506d1ec1a976e6 ...
$ echo "6465a2cd" > .git/refs/heads/foo
$ git branch * master foo
A B D E C F master foo
A B D E C F master foo Atteignabilité !
None
Rappel • Une branche • Un tag • HEAD :
commit actuel à un instant T Références
Merge
A B D E C F master foo HEAD $
git merge master
A B D E C F master foo $ git
merge master HEAD
A B D E C F master G foo $
git merge master HEAD
A B D E C F master foo G foo
$ git merge master HEAD
A B D E C F master foo G Atteignabilité
! HEAD
fast-forward
A B C E D foo master F HEAD $
git merge foo
A B C E D foo master F $ git
merge foo Atteignable HEAD
C E D foo master F master A B $
git merge foo HEAD
cherry-pick
A B D E C F master foo $ git
cherry-pick F HEAD
master foo F' A B D E C F foo
$ git cherry-pick F HEAD
rebase
$ git rebase master A B D E C F
master foo HEAD
B merge base A D E C F master foo
$ git rebase master HEAD
merge base premier ancêtre commun Atteignable !
A B D E C F master foo Atteignable !
HEAD
A B D E C F master foo C' $
git rebase master HEAD
A B D E C F master foo C' D'
$ git rebase master HEAD
A B D E C F master foo C' D'
foo $ git rebase master HEAD
A B D E C F master C' D' foo
$ git rebase master HEAD
A B D E C F master C' D' foo
Headless $ git rebase master HEAD
Headless non-atteignable depuis une référence susceptible d'être "garbage collecté"
A B D E C F master C' D' foo
$ git reset --hard D foo A B D E C F C' D' HEAD
$ git reflog ... 384b39c HEAD@{10}: merge feature/bdl-auth: Fast-forward 84541fe
HEAD@{11}: checkout: moving from feature/bdl-auth to 384b39c HEAD@{12}: rebase finished: returning to refs/heads/f 384b39c HEAD@{13}: rebase: Add auth bundle
fetch
A B C D master A B master origin local
origin/master
local A B C D master A B master origin
origin/master FETCH !
A B C D master A B master C D
origin/master origin origin/master local
push
A B master A B master origin local C D
A B master A B master origin push D D
local C
A B master A B master A B A B
origin local C D D PAS ATTEIGNABLE
A B master A B master A B A B
origin local C D D NOPE
None
Atteignabilité.
https://speackerdeck.com/ubermuda https://think-like-a-git.net/ Geoffrey Bachelet @ubermuda