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Exact equivalent to "git clone -b <branch> <repository>" in jgit [message #1847014]

Tue, 12 October 2021 05:12

Eclipse User

I have a local mirror of a quite big repository.

If I do:

git clone -b branch-name /home/where/my/local/mirror/is clone-dir

I end up with a clone of my local mirror in the "clone-dir" repository in 4 seconds.

While trying to do the same thing using jgit I can't make it faster than 220 seconds:

Git.cloneRepository()
        .setBranch("branch-name")
        .setURI("file:///home/where/my/local/mirror/is")
        .setDirectory(new File("/tmp/clone-dir"))
        .call();

I would like to understand what are the differences between the 2 approaches and if there is a way in jgit to do exactly what the "git clone" command is doing.

Thanks,

Re: Exact equivalent to "git clone -b <branch> <repository>" in jgit [message #1847034 is a reply to message #1847014]

Tue, 12 October 2021 14:15

Eclipse User

Does using setCloneAllBranches(false) make it run faster?

Re: Exact equivalent to "git clone -b <branch> <repository>" in jgit [message #1847046 is a reply to message #1847034]

Wed, 13 October 2021 02:42

Eclipse User

I tried it, yes, and it didn't make any difference.

I should probably mention that the local mirror I'm using contains a reference to a Bitbucket repository in its `config` file:

[remote "origin"]
    url = ssh://some-body@some.remote.bitbucket.repo.git
    fetch = +refs/*:refs/*
    mirror = true

If I add a `TextProgressMonitor` to the clone operation, then I see this:

remote: Counting objects: 74573
remote: Finding sources: 100% (1173572/1173572)
remote: Getting sizes:  100% (513288/513288)
remote: Compressing objects: 100% (1321579/1321579)
Receiving objects:      100% (1173572/1173572)
Resolving deltas:       100% (618623/618623)
Checking out files:     100% (19060/19060)

The "Receiving objects" and 'Resolving deltas" steps are taking most of the time.

So, it seems like if `jgit` is actually contacting the remote server even if it shouldn't.

Re: Exact equivalent to "git clone -b <branch> <repository>" in jgit [message #1847049 is a reply to message #1847046]

Wed, 13 October 2021 02:59

Eclipse User

I executed `jgit` again but this time being offline and the amount of time it takes doesn't change. So I guess that the issue is not related to `jgit` contacting a slow remote repository after all.

[Updated on: Wed, 13 October 2021 02:59] by Moderator

Re: Exact equivalent to "git clone -b <branch> <repository>" in jgit [message #1848414 is a reply to message #1847049]

Wed, 01 December 2021 09:50

Eclipse User

if you clone using a local path without specifying the file protocol c git will by default use the -l option which
hard-links all objects under .git/objects to your local mirror instead of cloning them, see [1]

try

git clone -b branch-name file:///home/where/my/local/mirror/is clone-dir

[1] https://git-scm.com/docs/git-clone#Documentation/git-clone.txt--l

Re: Exact equivalent to "git clone -b <branch> <repository>" in jgit [message #1848416 is a reply to message #1848414]

Wed, 01 December 2021 09:58

Eclipse User

The jgit CloneCommand has no implementation of the -l/--local option

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