Re: src: continued use of Subversion for getting updates

From: Warner Losh <imp_at_bsdimp.com>
Date: Fri, 25 Dec 2020 15:07:37 -0700
On Fri, Dec 25, 2020 at 2:41 PM Steffen Nurpmeso <steffen_at_sdaoden.eu> wrote:

> Ulrich Spörlein wrote in
>  <X+ZUa7NyatH2ktYI_at_acme.spoerlein.net>:
>  |On Wed, 2020-12-23 at 15:35:45 +0100, Steffen Nurpmeso wrote:
>  |>Jeffrey Bouquet wrote in
>  |> <E1ks2I6-0005nh-BQ_at_rmmprod05.runbox>:
>  |>|On Wed, 23 Dec 2020 11:13:07 +0100, Johan Hendriks
> <joh.hendriks_at_gmail.c\
>  |>|om> wrote:
>  |>|> On 23/12/2020 09:49, Warner Losh wrote:
>  |>|>> On Wed, Dec 23, 2020, 1:48 AM Graham Perrin <grahamperrin_at_gmail.com>
> \
>  |>|>> wrote:
>  |> ...
>  |>|> First of all a big thank you for all your time and effort you and all
>  |>|> the other people put in this tremendous task.
>  |>
>  |>Yes, it is great to have FreeBSD as a stable git repository now,
>  ...
>  |>I really dislike that vendor imports have been tagged.  Because
>  |>there is only one tag namespace you cannot avoid getting all this
>  |>cruft.  I mean, it is too late now, but one could have used
>  |>per-vendor import branches and step them via "git rm -rf '*' &&
>  |>tar -xf newball && git add . && git commit bla" or whatever, and
>  |>then join them in.  It does not matter for those who have all the
>  |
>  |That's basically what was done? I don't understand what you're saying
>  |here ...
>
> Well, cgit-beta did not have had all these tags if i recall
> correctly, did it?  I mean it has been two months or so since
> i last had it because "git fetch" bailed here due to the errors
> that i have reported, and fetching more than a gigabyte for
> brand-new fetches devastates here.
>

It had them, but not under the refs/head/vendor space but under the
refs/vendor space.

The multiple gigabyte fetch is because we changed the hashes two or three
times in the last few months.

But i _think_ all the tags below refs/tags/vendor/ like
>
>   vendor/wpa/2.9
>   vendor/wpa_supplicant/0.3.8
>   vendor/wpa_supplicant/0.5.10
>   vendor/wpa_supplicant/0.5.11
>   vendor/x86emu/4.6
>   vendor/xe/1.13
>
> etc. did not exist in cgit-beta?  I surely would have said
> something once comments have been requested, wouldn't i?
>

They did exist. They were under refs/vendor rather than refs/head/vendor
though.


> The thing is if i do
>
>   #?0|kent:free-src.git$ git ls-remote|wc -l
>   From https://git.freebsd.org/src.git
>   6814
>
> This is a tremendous amount of head references that need to be
> compared.
>
>   #?0|kent:free-src.git$ cd ../net-src.git/
>   #?0|kent:net-src.git$ git ls-remote|wc -l
>   From https://github.com/NetBSD/src.git
>   609
>   #?0|kent:net-src.git$ cd ../open-src.git/
>   #?0|kent:open-src.git$ git ls-remote|wc -l
>   From https://github.com/openbsd/src.git
>

  34
>



>   #?0|kent:open-src.git$ cd ../dfly-src.git/
>   #?0|kent:dfly-src.git$ git ls-remote|wc -l
>   From git://git.dragonflybsd.org/dragonfly.git
>   349
>

You can twek


> Linux is a little bit more
>
>   #?0|kent:linux.git$ git ls-remote|wc -l
>   From https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
>   7019
>
> but this specific repository tracks all release candidates and all
> the update releases, which alone go into the hundreds.
>
> Anyhow, the difference is the number of local references that
> effectively have to be compared against remote heads.  For example
> my local Linux repo is this:
>
>   [remote "origin"]
>   url = https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
>   fetch = +refs/heads/linux-4.19.y:refs/remotes/origin/linux-4.19.y
>   fetch = +refs/heads/linux-5.10.y:refs/remotes/origin/linux-5.10.y
>   fetch = +refs/heads/master:refs/remotes/origin/master
>
> And if i "sr" (show-ref) i get:
>
>   #?0|kent:linux.git$ git sr|wc -l
>   925
>
> which is a lot due to Linux update policy, but it only relates to
> the project itself, there is not one reference of what is
> effectively vendor data like for example
>
>     Merge tag 'wireless-drivers-next-2020-12-12' of
>     git://
> git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next
>
> may it be in refs/tags or anywhere else, whereas with FreeBSD and
>
>   [remote "origin"]
>   url = https://git.freebsd.org/src.git
>   fetch = +refs/heads/releng/5.5:refs/remotes/origin/releng/5.5
>   fetch = +refs/heads/releng/6.4:refs/remotes/origin/releng/6.4
>   fetch = +refs/heads/releng/7.4:refs/remotes/origin/releng/7.4
>   fetch = +refs/heads/releng/8.4:refs/remotes/origin/releng/8.4
>   fetch = +refs/heads/releng/9.3:refs/remotes/origin/releng/9.3
>   fetch = +refs/heads/releng/10.3:refs/remotes/origin/releng/10.4
>   fetch = +refs/heads/releng/11.4:refs/remotes/origin/releng/11.4
>   fetch = +refs/heads/releng/12.2:refs/remotes/origin/releng/12.2
>   fetch = +refs/heads/stable/12:refs/remotes/origin/stable/12
>   fetch = +refs/heads/main:refs/remotes/origin/main
>
> there is
>
>   #?0|kent:free-src.git$ git sr|wc -l
>   2137
>
> but if i go for "the real" FreeBSD itself it is just
>
>   #?0|kent:free-src.git$ git sr | grep -v vendor | wc -l
>   19
>
> namely
>
>   a62107ed19a1095158f454132a3b6ec536a4de7c refs/remotes/origin/main
>   8411c9ac24aabdbbde468778b35da58dc3c15178 refs/remotes/origin/releng/10.4
>   4adbf1f6686ffdc4c0555a018e14ec63b5981534 refs/remotes/origin/releng/11.4
>   2120d07af09cb830873554ba5405c5d3e51b41cc refs/remotes/origin/releng/12.2
>   d4c364b3dcf6dfe4e20c70d31912aad7e6219c14 refs/remotes/origin/releng/5.5
>   0df48150179039ce25e09b48c85aa39bffdbb4c4 refs/remotes/origin/releng/6.4
>   1c7fe7463d0204f08806b9da6d5d50fb7f75c5ad refs/remotes/origin/releng/7.4
>   554a1309dbd71bb59ed4e97ea5e0bc829dad0f04 refs/remotes/origin/releng/8.4
>   b06b7e647fe7b4eefbd29369cf0c24e1902bf72a refs/remotes/origin/releng/9.3
>   f4d0bc6aa6b90cbb0ea6cb993d9a10e36f5f4a4c refs/remotes/origin/stable/12
>   aed278eb8da79777d64e06bbc94ee0a018885477 refs/tags/release/10.3.0
>   20dbcb9a99d5c4b8ceb4897f27c53ab9fb853167 refs/tags/release/11.4.0
>   906434f95e83f03e0ac62d2544dad1656b5df1e9 refs/tags/release/12.2.0
>   1185954e6d623ada4ef32f25687ecd5e5c003545 refs/tags/release/5.5.0
>   44b4768239e96f6d6ba8a43cb2542e1bc83dec94 refs/tags/release/6.4.0
>   c31c07d1a9283bd28bb00ce519dfca69e529f452 refs/tags/release/7.4.0
>   174c77559c8cc317c743876f55f02bec233735f4 refs/tags/release/8.1.0
>   45cf4d6a59488ea4113bde749bb61de33882cc46 refs/tags/release/8.4.0
>   1fb916120b12fdc14c7f93aa5f14849db0efa166 refs/tags/release/9.3.0
>
> and thus
>
>   #?0|kent:free-src.git$ git sr | grep vendor | wc -l
>   2118
>
> Which is a pity since all these references will be checked during
> "git fetch" unless i am mistaken.
>
>  |>repository, but you decided to loose one of the strengts of git,
>  |>selective tracking.  Also i think it causes updates to require
>  |>more network traffic, i see this with the repos i have at
>  |>repo.or.cz, the one with few heads/tags is minimal, the other
>  |>requires hundreds of kilobytes just for the check that happens
>  |>many times a day.  All these references have to be compared each
>  |>and every time.  I think.  On the other hand, a few years back
>  |>i accidentally "heard" a discussion about improving the network
>  |>protocol and that "head" reference matching, iirc, so it may
>  |>change in the future.
>  |
>  |That's a valid point, we debated whether to keep vendor tags and decided
>  |for now to replicate what we have in SVN. We can still delete all the
>  |vendor tags on the main repo anytime we want ...
>
> I personally would track that in the commit message of the import
> on the vendor branch that anyway exists(!), and then when merging
> this into the mainline, but not create a real tag in the tag
> namespace.  Also the backups/ and such, because why?
>
> --steffen
> |
> |Der Kragenbaer,                The moon bear,
> |der holt sich munter           he cheerfully and one by one
> |einen nach dem anderen runter  wa.ks himself off
> |(By Robert Gernhardt)
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Received on Fri Dec 25 2020 - 21:07:50 UTC

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