command used for gerrit replication ?

[gjarms]

Dear Gerrit experts,

I am trying to understand how gerrit replication works internally. I run the following command for the gerrit replication

ssh -p 29418 <gerrit-server> replication start project-name. 

I would like to understand what is the actual command used for the replication? Is this a git push ? or something else?

Is it possible to simulate gerrit replication using git only?

Regards,

gjarms

[Peter Niederlag]

Hi,

On 07.07.2014 14:24, gjarms wrote:
> Dear Gerrit experts,
[...]

> Is it possible to simulate gerrit replication using git only?

git "replication" basically boils down to "git fetch" plus "git push".

You get a nice example if you start a git clone with the --mirror
option: "git clone --mirror".

git replication is just a matter of having "remotes" (repositories on
different url's) and "refspecs" (which sha1's to fetch and push).

--- example of .git/config for replication -----
[remote "origin"]
fetch = +refs/*:refs/*
#fetch = +refs/heads/*:refs/heads/*
#fetch = +refs/tags/*:refs/tags/*
mirror = true
url = https://github.com/UPSTREAM/PROJECT.git
[remote "mirror"]
fetch = +refs/*:refs/*
mirror = true
url = g...@github.com:MIRROR/PROJECT.git
------------------------------------------------
git fetch upstream; git push mirror

In order for learning git "repliction" the manual on "git fetch --help"
and/or "git push --help" might be worth reading.

I think gerrit replication just applies permission checks on top of
regular git replication.

Greets,
Peter

[Makson Lee]

And what are differences between replication over git and replication over ssh?

Regards,

Makson 

 

[Steffen Gebert]

> And what are differences between replication over git and replication over ssh?

The one uses the git protocol, the other one SSH :-P

- git requires write access to a git-daemon, which is not so easy to secure, as there is no authentication. You have to make sure that only Gerrit can access this port, not the rest of the world / your corporate network
- ssh requires that the remote host accepts the ssh key that you configured for the (system) user as which gerrit is running (in ~/.ssh/config). While this is easy to set up, it has some scalability issues with bigger installations.

Yours
Steffen

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