Re: [boost] [git] Bumping git version requirement to 1.7.10

Subject: Re: [boost] [git] Bumping git version requirement to 1.7.10
From: Vladimir Prus (ghost_at_[hidden])
Date: 2013-12-31 03:15:36

On 30.12.2013 23:34, Rene Rivera wrote:
> On Mon, Dec 30, 2013 at 1:26 PM, Vladimir Prus <ghost_at_[hidden]> wrote:
>
>> On 30.12.2013 23:22, Eric Niebler wrote:
>>
>>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA1
>>>
>>> On 12/30/2013 06:47 AM, Beman Dawes wrote:
>>>
>>>> The regression scripts are using the clone --single-branch option,
>>>> which became available at git 1.7.10, so we are planning to bump
>>>> the version requirement.
>>>>
>>>
>>> Unless I'm mistaken, the most recent Ubuntu LTS release is still on
>>> 1.7.9.5. I think this change would inconvenience a significant segment
>>> of users.
>>>
>>
>> And it seems one can accomplish the same effect with earlier versions:
>>
>>          http://stackoverflow.com/questions/1911109/git-clone-a-
>> specific-branch
>>
>>
> Hm.. It's not clear from the docs that they are equivalent.  "-b" checks
> out the given branch. While "--single-branch" clones only the data for the
> branch.

I have referring to this:

        git init
        git remote add -t refspec remotename host:/dir.git
        git fetch

Here's a specific example:

        $ git init .
        $ git remote add --no-tags -t develop origin git_at_[hidden]:boostorg/build.git
        $ git fetch
        remote: Compressing objects: 100% (13708/13708), done.
        remote: Total 52255 (delta 37252), reused 52250 (delta 37248)
        Receiving objects: 100% (52255/52255), 27.04 MiB | 2.44 MiB/s, done.
        Resolving deltas: 100% (37252/37252), done.

On the other hand, it does not reduce much of download size, compares to full clone:

        remote: Counting objects: 55789, done.
        remote: Compressing objects: 100% (15291/15291), done.
        remote: Total 55789 (delta 38985), reused 55742 (delta 38939)
        Receiving objects: 100% (55789/55789), 28.62 MiB | 691 KiB/s, done.
        Resolving deltas: 100% (38985/38985), done.

Presumably because there are merge commits on 'develop' having commits from both
master and develop as parent.

Maybe, if you really want to reduce download speed, you need --depth option? Like so:

        $ git init .
        $ git remote add --no-tags -t develop origin git_at_[hidden]:boostorg/build.git
        $ git fetch --depth=1
        remote: Counting objects: 967, done.
        remote: Compressing objects: 100% (882/882), done.
        remote: Total 967 (delta 72), reused 806 (delta 57)
        Receiving objects: 100% (967/967), 2.10 MiB | 567 KiB/s, done.
        Resolving deltas: 100% (72/72), done.

Note that using just --depth=1 without --no-tags and -t to remote add fetches 7MiB, so the above
is probably the smallest you can get.

HTH,
Volodya