From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7ED74C433FE for ; Fri, 3 Dec 2021 13:34:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352522AbhLCNh6 (ORCPT ); Fri, 3 Dec 2021 08:37:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40528 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241579AbhLCNh6 (ORCPT ); Fri, 3 Dec 2021 08:37:58 -0500 Received: from mail-wr1-x435.google.com (mail-wr1-x435.google.com [IPv6:2a00:1450:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DF42AC06173E for ; Fri, 3 Dec 2021 05:34:33 -0800 (PST) Received: by mail-wr1-x435.google.com with SMTP id d24so5923688wra.0 for ; Fri, 03 Dec 2021 05:34:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:in-reply-to:references:from:date:subject:fcc :content-transfer-encoding:mime-version:to:cc; bh=uQJ4Fsl7CqY1kSfF5905tSksE/gGYx0P1d+aDxCpFio=; b=J2jOHkIafDyCO9wAnS2gmvnPk4CX9eSP5u7YrNhQX9VPr3QxNIohReAq2GoLt9ZpP7 +XFDobvR/jTOBYAsblg2huCi2L8JXOrLsoDaPxcL3filcMgD3OLCReR0MZfSVkS8JmFs WxohLQTq/jAOnRCqfL9CSf64hjtu8kYRqZVV0/8O2qrdD63O064X+o7oVO9h9mEMsLCL DUrFf6sVtiYeqJvyi4H4WJdKlEy2x57bNsnzZBJv3qEFMHYFADHgdoxgpXuxZU5SPAUW vZiOhJQrqSqhdIrmhIF18SnMGuI1GbdtNOyVazm2xZzd3wBQ8Fbo1dXOzC78DliT+WFq IjGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:in-reply-to:references:from:date :subject:fcc:content-transfer-encoding:mime-version:to:cc; bh=uQJ4Fsl7CqY1kSfF5905tSksE/gGYx0P1d+aDxCpFio=; b=3f4w+kJjPmReNDCUKFEUAj7JrJ367RjzlQz16c4QpgwUu7ZQwIDtygh21GK5lt5/+6 RYZJymVZ1z/ZWTizJmEfkdCJ1aMCAIbRsoMJC7crJWc57VeFk14NfSZ+Clz+eSYjp2IP Fs+1DNh9OnUyLpfAsBUvjMWGp4SGCE3sLfAx/Cz+nsGAV3z56yCicDS7R54j9HEyS63F gM6gmGRbGFVQjBwG0XocXx6jboBTPIXoW10jg52gLZC5A8SH/D1c3BcppCMIlXaK5gim dXjvlMiexBKoWsDkhugsiRi1RTriZgYEY82wS8FxW8v+TxWTKNBm6mDxFZgzJ1bhk7LP NXAA== X-Gm-Message-State: AOAM531a/gk/94uUjYHAbwiQLt2VrBTO7te01/kRfn1U8m80OhnyLi6G vAtSU5SBRVySULEZv9b6ZsteceibSPE= X-Google-Smtp-Source: ABdhPJz3kyxajDRnzQvfE95TujViNADLqbrmR2lSm6GSNbLRVeVffYKEi0HAXP4nJF3DVjRzOSa5VA== X-Received: by 2002:adf:8b0e:: with SMTP id n14mr20500395wra.281.1638538472180; Fri, 03 Dec 2021 05:34:32 -0800 (PST) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id k27sm5288175wms.41.2021.12.03.05.34.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Dec 2021 05:34:31 -0800 (PST) Message-Id: <3a2e28275f112d114bbd3ba046f440c5f917fc32.1638538470.git.gitgitgadget@gmail.com> In-Reply-To: References: From: "Johannes Schindelin via GitGitGadget" Date: Fri, 03 Dec 2021 13:34:15 +0000 Subject: [PATCH v10 01/15] scalar: add a README with a roadmap Fcc: Sent Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit MIME-Version: 1.0 To: git@vger.kernel.org Cc: Derrick Stolee , Eric Sunshine , =?UTF-8?Q?=C3=86var_Arnfj=C3=B6r=C3=B0?= Bjarmason , Elijah Newren , Bagas Sanjaya , Theodore Ts'o , Matt Rogers , Johannes Schindelin , Johannes Schindelin Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Johannes Schindelin The Scalar command will be contributed incrementally, over a bunch of patch series. Let's document what Scalar is about, and then describe the patch series that are planned. Signed-off-by: Johannes Schindelin --- contrib/scalar/README.md | 82 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 contrib/scalar/README.md diff --git a/contrib/scalar/README.md b/contrib/scalar/README.md new file mode 100644 index 00000000000..634b5771ed3 --- /dev/null +++ b/contrib/scalar/README.md @@ -0,0 +1,82 @@ +# Scalar - an opinionated repository management tool + +Scalar is an add-on to Git that helps users take advantage of advanced +performance features in Git. Originally implemented in C# using .NET Core, +based on the learnings from the VFS for Git project, most of the techniques +developed by the Scalar project have been integrated into core Git already: + +* partial clone, +* commit graphs, +* multi-pack index, +* sparse checkout (cone mode), +* scheduled background maintenance, +* etc + +This directory contains the remaining parts of Scalar that are not (yet) in +core Git. + +## Roadmap + +The idea is to populate this directory via incremental patch series and +eventually move to a top-level directory next to `gitk-git/` and to `git-gui/`. The +current plan involves the following patch series: + +- `scalar-the-beginning`: The initial patch series which sets up + `contrib/scalar/` and populates it with a minimal `scalar` command that + demonstrates the fundamental ideas. + +- `scalar-c-and-C`: The `scalar` command learns about two options that can be + specified before the command, `-c =` and `-C `. + +- `scalar-diagnose`: The `scalar` command is taught the `diagnose` subcommand. + +- `scalar-and-builtin-fsmonitor`: The built-in FSMonitor is enabled in `scalar + register` and in `scalar clone`, for an enormous performance boost when + working in large worktrees. This patch series necessarily depends on Jeff + Hostetler's FSMonitor patch series to be integrated into Git. + +- `scalar-gentler-config-locking`: Scalar enlistments are registered in the + user's Git config. This usually does not represent any problem because it is + rare for a user to register an enlistment. However, in Scalar's functional + tests, Scalar enlistments are created galore, and in parallel, which can lead + to lock contention. This patch series works around that problem by re-trying + to lock the config file in a gentle fashion. + +- `scalar-extra-docs`: Add some extensive documentation that has been written + in the original Scalar project (all subject to discussion, of course). + +- `optionally-install-scalar`: Now that Scalar is feature (and documentation) + complete and is verified in CI builds, let's offer to install it. + +- `move-scalar-to-toplevel`: Now that Scalar is complete, let's move it next to + `gitk-git/` and to `git-gui/`, making it a top-level command. + +The following two patch series exist in Microsoft's fork of Git and are +publicly available. There is no current plan to upstream them, not because I +want to withhold these patches, but because I don't think the Git community is +interested in these patches. + +There are some interesting ideas there, but the implementation is too specific +to Azure Repos and/or VFS for Git to be of much help in general (and also: my +colleagues tried to upstream some patches already and the enthusiasm for +integrating things related to Azure Repos and VFS for Git can be summarized in +very, very few words). + +These still exist mainly because the GVFS protocol is what Azure Repos has +instead of partial clone, while Git is focused on improving partial clone: + +- `scalar-with-gvfs`: The primary purpose of this patch series is to support + existing Scalar users whose repositories are hosted in Azure Repos (which + does not support Git's partial clones, but supports its predecessor, the GVFS + protocol, which is used by Scalar to emulate the partial clone). + + Since the GVFS protocol will never be supported by core Git, this patch + series will remain in Microsoft's fork of Git. + +- `run-scalar-functional-tests`: The Scalar project developed a quite + comprehensive set of integration tests (or, "Functional Tests"). They are the + sole remaining part of the original C#-based Scalar project, and this patch + adds a GitHub workflow that runs them all. + + Since the tests partially depend on features that are only provided in the + `scalar-with-gvfs` patch series, this patch cannot be upstreamed. -- gitgitgadget