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01.07.2021, adminJoin Stack Overflow spefd learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I've started playing with Git and have come across the terms "upstream" and "downstream". I've seen these before but never speed upstream and downstream 000 them fully. In terms of source control, you're " downstream upstram when you copy clone, checkout, etc from a repository.
Information flowed "downstream" to you. When you make changes, you usually want to send upstrezm back " upstream " so they make it into that repository so that everyone pulling from the same source is working with all the same changes. This is mostly a social issue of how everyone can coordinate their work rather than a technical requirement of source control.
You want to get your changes into the main project so you're not tracking divergent lines of development. Sometimes you'll read about package or release managers the people, not the tool speed upstream and downstream 000 about submitting changes to "upstream". That usually means they had to adjust the original sources so they could speed upstream and downstream 000 a package for their. They don't want to keep making those changes, so if they send them "upstream" to the original source, they shouldn't have to deal fishing dinghy for sale 2020 the same issue in the next release.
Speed upstream and downstream 000 you read in git tag man page :. One important aspect of git is it is distributed, and downxtream distributed largely means there is no inherent "upstream" or "downstream" in the. Those notions are always relative between two repos and depends on the way data flows:. The DVCS Distributed Version Control System twist is: amd have no idea what downstream actually is, beside your own repo relative to the remote repos you have declared.
In term of " flow of data ", your repo is at the bottom "downstream" of a flow coming from upstream repos "pull from" and going back to the same or other upstream repos snd to". It means you are pulling from an "upstream" repo where a rebase took placeand you the "downstream" repo is stuck with the consequence lots of duplicate commits, because the branch rebased upstream recreated the commits of the same branch you have locally.
That is bad because for one "upstream" repo, there can be many downstream repos i. Again, with the "flow of data" analogy, in a DVCS, one bad command "upstream" can have a " ripple effect " downstream. Note: this is not limited to data. It also applies to parametersas git commands like the fownstream ones often call internally other git commands the "plumbing" ones.
See rev-parse man page :. Many git porcelainish commands take mixture of pseed i. Dodnstream command is used to distinguish between speed upstream and downstream 000. The term upstream also has some unambiguous meaning as comes to the suite of GIT tools, upsteeam relative to tracking. It will print an error message otherwise:. Just issue :. For every branch that is up to date or successfully pushed, add upstream tracking reference, used by argument-less git-pull 1 and other commands.
For more information, see speed upstream and downstream 000. Defines, together with branch. It defaults to origin if no remote is configured. Generally speaking, upstream is where you cloned amd the origin. Downstream is any project that integrates your work with other works. There is, alas, another use of "upstream" that the other answers here downxtream not getting at, namely to refer to the parent-child relationship of commits within a repo.
Scott Chacon Speed Of The Boat Upstream And Downstream Linux in the Pro Git book is particularly prone to this, and the results are unfortunate. Do not imitate this way of speaking. He wants to say that commit B is the only child of the only child of Why this direction should be called "upstream" rather than "downstream", or why the geometry of such a pure straight-line graph should be described "directly upstream", is completely unclear and probably arbitrary.
The man page for git-merge does a far better job of explaining this relationship when it says that "the current branch head is an ancestor of the named commit. Indeed, Chacon himself appears to use "downstream" later to mean exactly the same thing, when he speaks of rewriting all child commits of a deleted commit:. Downstram must rewrite all the commits downstream from 6df76 uptream fully remove this file from your Git history.
Basically he seems not to have any clear idea what he means by "upstream" and "downstream" when referring to the history of commits over time. This use is informal, then, and not spsed be encouraged, as it is just confusing. It is perfectly clear that every commit except one has at least one parent, and that parents of parents are thus ancestors; and in the other direction, commits have children and descendants.
That's downstrezm terminology, and describes the directionality speed upstream and downstream 000 the graph unambiguously, so that's the way to talk when you want to describe how commits relate to one another within sped graph geometry of a repo. Do not use "upstream" or "downstream" loosely in this situation. The man page does go on to describe a situation where the use of "upstream" is legitimate: fast-forwarding often happens when "you are tracking an upstream repository, you have committed fishing dinghy for sale 2020 local changes, and now you want to eownstream to a newer upstream revision.
But in fishing dinghy for sale 2020 man page there is a remote repository; there is upstreaj remote repository in Chacon's cited example of fast-forwarding, just a couple of locally created branches. Stack Overflow for Teams � Collaborate and share knowledge with a private group. Create a free Team Downsteeam is Teams? Learn. Asked 10 years, 11 months ago. Active 9 months ago. Viewed k times. ThomasMcLeod 6, 4 4 gold badges 37 37 silver badges 71 71 bronze badges.
Related: What does 'upstream' mean? Add a comment. Active Oldest Votes. DilithiumMatrix I would say upstream and downstream are adjectives � Crt Jun 9 '17 at They downstrea, adjectives when they are used as modifiers, xownstream those terms are often used ajd nouns. When "upstream" and "downstream" describe a relative position, I think, technically, that makes them adjectives. This is just a comment on what Ulstream understand, not correcting.
MycrofD upatream can be used as adjectives and nouns depending on the context � reggaeguitar Sep 21 '18 at When you read in git tag man page : One important aspect of git is it is distributed, and being distributed largely means there is no inherent "upstream" or "downstream" in the. Those notions are always relative between two repos and depends on the way data flows: If "yourRepo" has declared "otherRepo" as a remote one, then : you are pulling from upstream "otherRepo" "otherRepo" is "upstream from you", and you are "downstream for otherRepo".
Basically: In term of " flow of data ", your repo is at the bottom "downstream" of a flow coming from upstream repos "pull from" and going back to the same or other upstream repos "push to". See rev-parse man page : Many git porcelainish commands take mixture of flags i. Abu Nafee Ibna Zahid 1 1 gold badge 5 5 silver badges 17 17 bronze badges. VonC VonC 1. I have reworded my answer to better illustrate the role of the "upstream" repo relative to your own local and "downstream" repo.
Those are just interchangeable names, only the 'git This adds 2 parameters in. Upstream and Push Gotcha take a look at git-config 1 Manual Page git config --global push. Peter Host Peter Host 1, 11 11 silver badges 10 10 bronze badges. Excerpt of git branch --help apeed of As this option had confusing syntax, it is no longer supported. Please use --track or --set-upstream-to instead. That's speed upstream and downstream 000 bit of informal terminology.
As far as Git is concerned, every other repository is just uupstream remote. The terms are not restricted to Git repositories. For instance, Ubuntu is a Upetream derivative, so Debian is upstream for Ubuntu. Lii 9, 6 6 gold badges 53 53 silver badges 73 73 bronze badges. Upstream Called Harmful There is, alas, another use of "upstream" that the other answers here are not getting at, namely to refer to the parent-child relationship of commits within a repo.
Indeed, Chacon himself appears u;stream use "downstream" later to mean exactly the same thing, when he speaks of rewriting all child commits of a deleted commit: You must rewrite all the commits downstream from 6df76 to fully remove this file from your Git history Basically he seems not 000 have any clear idea what he means by "upstream" and Average Speed Of Boat In Upstream And Downstream Error "downstream" when referring to the history of commits over time. The git-rebase man page also suffers from this overloading: the commit that is checked out before rebasing is termed the "upstream".
This, too, may have affected Chacon's usage. Good point. Would be kind of helpful to gather common "git-terminology". Especially for newbies or ppl contributing to git. Would have saved me good time getting used to the wording speed upstream and downstream 000 the git man pages. SebNag something like upstraem Came here from the git-rebase docs because I was totally confused why a commit ref would be called "upstream" there in fact, I was doubting myself as I haven't seen this terminology.
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