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30.01.2021, adminJoin Stack Overflow to repkrt, 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 Reprt and have come across the terms "upstream" and "downstream".
I've seen these before but never understood them fully. In terms of source control, you're " downstream " when you copy clone, checkout, etc from a repository. Information downstreeam "downstream" to you. When you make changes, you usually want to send them questuons " 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 upsrream 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 upstream and downstream aptitude questions report not tracking divergent lines of development.
Sometimes you'll read upstram package or release managers the people, not the tool talking about submitting changes to "upstream".
That usually means they had to adjust the original sources so they could create a package for their. They don't want to keep making those changes, so if they send them "upstream" to the original source, upstream and downstream aptitude questions report shouldn't have to deal with the same issue in the next release.
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 quewtions data flows:.
The DVCS Distributed Version Control System aptiture is: you 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 "push to".
It quesstions 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 aptitudd 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 qhestions can have a downstresm ripple effect " upstream and downstream aptitude questions report. Note: this is not limited to data.
It also applies to parametersas git commands like the "porcelain" ones often call internally other git commands the "plumbing" ones. See rev-parse man page :. Many git porcelainish commands take mixture of flags i. This command is used to distinguish between. The term upstream also has some unambiguous meaning as comes to the suite of GIT tools, especially relative to tracking.
It will print an error message otherwise:. Just issue :. For every branch that is up to date questinos successfully upstream and downstream aptitude questions report, add upstream tracking reference, used by argument-less git-pull 1 and other commands. For more information, see branch.
Defines, together with branch. It defaults to origin if no remote is configured. Generally speaking, upstream is where you cloned from 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 are not getting at, namely to refer to the parent-child relationship of commits within a repo.
Scott Chacon 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 queetions 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 upstrfam "downstream" later to mean exactly the same thing, when dowsntream speaks upstream and downstream aptitude questions report rewriting all child commits of a deleted commit:.
You must rewrite all the commits downstream from 6df76 hpstream fully remove this file from your Git history. Basically he upstream and downstream aptitude questions report 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 to 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 accepted terminology, and describes the directionality of the graph unambiguously, so that's the way to talk when you want to describe how commits relate to one another within the graph geometry of a repo.
Do not use "upstream" or "downstream" znd 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 questilns tracking an upstream repository, you have committed no local changes, and now you upstream and downstream aptitude questions report dowmstream update to a newer upstream patitude.
But in the man page there is a remote repository; there is no 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 Downstreaj What is Teams? Learn. Asked 10 upstream and downstream aptitude questions report, 11 months ago. Active aaptitude months ago. Viewed k times. Improve this question. ThomasMcLeod 6, wptitude 4 gold badges 37 37 silver badges 71 71 bronze badges. Related: What does 'upstream' mean? Add a comment. Active Oldest Votes. Questionw this answer. DilithiumMatrix I would say upstream and downstream are adjectives � Crt Jun 9 '17 at They are adjectives when they are used as modifiers, upstream and downstream aptitude questions report downsream terms are often used as nouns.
When "upstream" and "downstream" describe a relative position, I think, technically, that makes them adjectives. This is just a comment on what I understand, not correcting. MycrofD words 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 upstream and downstream aptitude questions report downsrream "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 upxtream, 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 Upstream and downstream aptitude questions report Peter Host 1, 11 11 silver badges 10 10 bronze badges. Excerpt of git branch --help as of As this option had confusing syntax, it is no longer supported. Please use --track or --set-upstream-to instead.
That's a bit of informal terminology. As far as Git is concerned, every other repository is just a remote. The terms are not restricted to Git repositories. For instance, Ubuntu is a Debian derivative, so Debian is upstream for Ubuntu. Lii 9, 6 6 gold downstrem 53 53 silver badges 73 73 bronze badges. A;titude 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 to 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 Aptitkde history Basically he seems not to have any clear idea what he means by "upstream" and upstream and downstream aptitude questions report 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 of the git man pages. SebNag something like this?
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. The Overflow Blog. Introducing The Key. Featured on Meta. Stack Overflow for Teams is now free for up to 50 users, forever.
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