External repository always requires a repository manager?

2010-08-16 Thread Trevor Harmon
Hi,

I've set up an internal repository for deploying project artifacts. It was 
remarkably easy to do. All I needed was some web space with SCP access. After 
that it was only a matter of configuring my POM's distributionManagement to 
point to the URL. No repository manager needed.

Now I'd like to set up an external repository. (Not sure if that's the right 
term.) The only purpose would be to cache artifacts so that Maven can download 
them from my repository instead of making a trip out to Central.

However, it appears that this type of repository is not so easy to set up. My 
understanding is that it would require the use of a repository manager. I'm 
hoping to avoid that, since repository managers have to run as a background 
service (e.g., in a Java EE container). This would really complicate things, 
mainly because I don't have root access to the server and would have to get 
special permission to set up the service.

Am I correct in thinking that an external repository necessarily requires 
setting up a repository manager? Thanks,

Trevor


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Re: External repository always requires a repository manager?

2010-08-16 Thread Stephen Connolly
Your life would be much easier using a repository manager for your
internal repository.  Nexus is almost trivial to set up, for example.

As for internal vs external, there is no difference, you don't need a
repository manager... but your life will always be easier if you use one.

-Stephen

P.S. I only mention Nexus because it is the repository manager I have had
good experience with.

On 16 August 2010 09:16, Trevor Harmon tre...@vocaro.com wrote:

 Hi,

 I've set up an internal repository for deploying project artifacts. It
 was remarkably easy to do. All I needed was some web space with SCP access.
 After that it was only a matter of configuring my POM's
 distributionManagement to point to the URL. No repository manager needed.

 Now I'd like to set up an external repository. (Not sure if that's the
 right term.) The only purpose would be to cache artifacts so that Maven can
 download them from my repository instead of making a trip out to Central.

 However, it appears that this type of repository is not so easy to set up.
 My understanding is that it would require the use of a repository manager.
 I'm hoping to avoid that, since repository managers have to run as a
 background service (e.g., in a Java EE container). This would really
 complicate things, mainly because I don't have root access to the server and
 would have to get special permission to set up the service.

 Am I correct in thinking that an external repository necessarily requires
 setting up a repository manager? Thanks,

 Trevor


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Re: External repository always requires a repository manager?

2010-08-16 Thread Trevor Harmon
On Aug 16, 2010, at 1:20 AM, Stephen Connolly wrote:

 Your life would be much easier using a repository manager for your
 internal repository.  Nexus is almost trivial to set up, for example.

It is trivial to set up *if* you have the necessary permissions to set up the 
service. In my case, I'm an independent contractor, and the only server I 
personally have access to is from one of those shared hosting providers, and 
it's simply not possible to run Jetty or Tanuki in that kind of environment. My 
client does have their own servers, but I'd have to make a special request to 
get one of their IT guys to set it up for me. So unless you've got root access 
to your own server... not trivial.

 As for internal vs external, there is no difference, you don't need a
 repository manager...


Okay, but I'm just not understanding how to configure Maven for that. Sure, I 
could set up a repositories element like this:

repositories
repository
idcentral/id
urlhttp://repo.myserver.com/repository//url
/repository
/repositories

And that tells Maven to check the above URL for artifacts before going out to 
repo1.maven.org. But it only knows how to download, not upload. How can Maven 
put the newly downloaded artifacts into this repository? (I thought that's what 
a repository manager is for...)

Trevor


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Re: External repository always requires a repository manager?

2010-08-16 Thread Ron Wheeler

 You should discuss this in the Nexus forum.
Nexus is easy to st up and does not require a separate container.

It does both internal and external with proper access control.

Other repository solutions may also work but I use Nexus for my 
development team.


Ron

On 16/08/2010 4:16 AM, Trevor Harmon wrote:

Hi,

I've set up an internal repository for deploying project artifacts. It was 
remarkably easy to do. All I needed was some web space with SCP access. After that it was only 
a matter of configuring my POM'sdistributionManagement  to point to the URL. No 
repository manager needed.

Now I'd like to set up an external repository. (Not sure if that's the right 
term.) The only purpose would be to cache artifacts so that Maven can download them from 
my repository instead of making a trip out to Central.

However, it appears that this type of repository is not so easy to set up. My 
understanding is that it would require the use of a repository manager. I'm 
hoping to avoid that, since repository managers have to run as a background 
service (e.g., in a Java EE container). This would really complicate things, 
mainly because I don't have root access to the server and would have to get 
special permission to set up the service.

Am I correct in thinking that an external repository necessarily requires 
setting up a repository manager? Thanks,

Trevor


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Re: External repository always requires a repository manager?

2010-08-16 Thread Ron Wheeler

 On 16/08/2010 4:56 AM, Trevor Harmon wrote:

On Aug 16, 2010, at 1:20 AM, Stephen Connolly wrote:


Your life would be much easier using a repository manager for your
internal repository.  Nexus is almost trivial to set up, for example.

It is trivial to set up *if* you have the necessary permissions to set up the 
service. In my case, I'm an independent contractor, and the only server I 
personally have access to is from one of those shared hosting providers, and 
it's simply not possible to run Jetty or Tanuki in that kind of environment. My 
client does have their own servers, but I'd have to make a special request to 
get one of their IT guys to set it up for me. So unless you've got root access 
to your own server... not trivial.


Find a provider that lets you run your own application.
Put it on a cloud service.

As for internal vs external, there is no difference, you don't need a
repository manager...


Okay, but I'm just not understanding how to configure Maven for that. Sure, I could 
set up arepositories  element like this:

repositories
 repository
 idcentral/id
 urlhttp://repo.myserver.com/repository//url
 /repository
/repositories

And that tells Maven to check the above URL for artifacts before going out to 
repo1.maven.org. But it only knows how to download, not upload. How can Maven 
put the newly downloaded artifacts into this repository? (I thought that's what 
a repository manager is for...)

Trevor


Read the Nexus docs on how to set up a deployment.
In general, your individual settings.xml defines download location since 
it is usually the same for all your projects and the parent project pom 
defines the deployment since it might vary depending on the project.


Ron

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Re: External repository always requires a repository manager?

2010-08-16 Thread Justin Edelson
What you are referring to as a external repository is essentially a
caching proxy.

If the only repository you are proxying is central, then theoretically
you could use any caching proxy server (including Apache).

But if you are a single developer, I'm not sure what value you are
looking to get out of this. Your local Maven repository acts as a local
cache, so unless you need to blow this away with some regularity, what's
the point?

Justin

On 8/16/10 4:16 AM, Trevor Harmon wrote:
 Hi,
 
 I've set up an internal repository for deploying project artifacts. It was 
 remarkably easy to do. All I needed was some web space with SCP access. After 
 that it was only a matter of configuring my POM's distributionManagement to 
 point to the URL. No repository manager needed.
 
 Now I'd like to set up an external repository. (Not sure if that's the 
 right term.) The only purpose would be to cache artifacts so that Maven can 
 download them from my repository instead of making a trip out to Central.
 
 However, it appears that this type of repository is not so easy to set up. My 
 understanding is that it would require the use of a repository manager. I'm 
 hoping to avoid that, since repository managers have to run as a background 
 service (e.g., in a Java EE container). This would really complicate things, 
 mainly because I don't have root access to the server and would have to get 
 special permission to set up the service.
 
 Am I correct in thinking that an external repository necessarily requires 
 setting up a repository manager? Thanks,
 
 Trevor
 
 
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Re: External repository always requires a repository manager?

2010-08-16 Thread Trevor Harmon
On Aug 16, 2010, at 4:48 AM, Ron Wheeler wrote:

 Find a provider that lets you run your own application.
 Put it on a cloud service.

Yes, those are ways around the shared hosting problem, but as soon as I have to 
purchase and manage separate server space just to run a repository manager, it 
is no longer trivial. (At least, not as trivial as it is to set up site and 
artifact deployment, which only require an HTTP server and some way to upload 
the files.)

 Read the Nexus docs on how to set up a deployment.

Is there a specific section I should be looking at? I can't seem to find 
anything about deployment without a repository manager. Everything I've read in 
the Nexus docs is in the context of a repository manager.

Thanks,

Trevor


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Re: External repository always requires a repository manager?

2010-08-16 Thread Trevor Harmon
On Aug 16, 2010, at 7:20 AM, Justin Edelson wrote:

 But if you are a single developer, I'm not sure what value you are
 looking to get out of this. Your local Maven repository acts as a local
 cache, so unless you need to blow this away with some regularity, what's
 the point?

Well, I'm a single developer now, but before long the project will grow, and 
maybe spawn new projects. I'd prefer to learn the ins and outs of repositories 
when the project is small and manageable. I was also intrigued by the promise 
to shave minutes off a build [1] and was wondering if this does in fact 
require a repository manager or could be accomplished more simply. Also, I just 
wanted to be a good Maven citizen and take a load off Central, if that wasn't 
too hard to do.

But perhaps the most important reason is that I need to deploy customized 
versions of some Maven plugins. There are a couple I'm using on Central that 
are buggy, and might not be updated for awhile, so I need to deploy and use 
versions that have the bugs fixed. It's not clear to me if I need a repository 
manager for that, or if I can get away with the non-managed repository I have 
now for deploying project artifacts (and the site).

Trevor

[1] http://maven.apache.org/repository-management.html


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Re: External repository always requires a repository manager?

2010-08-16 Thread Ron Wheeler

 On 16/08/2010 12:07 PM, Trevor Harmon wrote:

On Aug 16, 2010, at 4:48 AM, Ron Wheeler wrote:


Find a provider that lets you run your own application.
Put it on a cloud service.

Yes, those are ways around the shared hosting problem, but as soon as I have to 
purchase and manage separate server space just to run a repository manager, it 
is no longer trivial. (At least, not as trivial as it is to set up site and 
artifact deployment, which only require an HTTP server and some way to upload 
the files.)


Nexus is easier to install than an HTTP server and a lot less configuration.

Once it is set up, you have a great tool for controlling maven artifacts.
Doing it right sometimes takes more work up front but the rest of your 
life will be much simpler.

It makes Maven a pleasure to work with on an everyday basis.


Read the Nexus docs on how to set up a deployment.

Is there a specific section I should be looking at? I can't seem to find 
anything about deployment without a repository manager. Everything I've read in 
the Nexus docs is in the context of a repository manager.


Yes it is a repo system but the docs will tell you what you have to do.


Thanks,

Trevor


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Re: External repository always requires a repository manager?

2010-08-16 Thread Ron Wheeler

 On 16/08/2010 12:23 PM, Trevor Harmon wrote:

On Aug 16, 2010, at 7:20 AM, Justin Edelson wrote:


But if you are a single developer, I'm not sure what value you are
looking to get out of this. Your local Maven repository acts as a local
cache, so unless you need to blow this away with some regularity, what's
the point?

Well, I'm a single developer now, but before long the project will grow, and maybe spawn 
new projects. I'd prefer to learn the ins and outs of repositories when the project is 
small and manageable. I was also intrigued by the promise to shave minutes off a 
build [1] and was wondering if this does in fact require a repository manager or 
could be accomplished more simply. Also, I just wanted to be a good Maven citizen and 
take a load off Central, if that wasn't too hard to do.

A repo manager like Nexus is really worthwhile. It is one of my biggest 
regrets that we waited 2 years before setting it up.
It has made working properly with Maven a much simpler thing to 
understand. It has got the whole team singing out of the same choir book 
and using the right versions for all the builds.
It simplifies the use of software libraries that for licensing reasons 
are not available in Maven Central.


Ron

But perhaps the most important reason is that I need to deploy customized 
versions of some Maven plugins. There are a couple I'm using on Central that 
are buggy, and might not be updated for awhile, so I need to deploy and use 
versions that have the bugs fixed. It's not clear to me if I need a repository 
manager for that, or if I can get away with the non-managed repository I have 
now for deploying project artifacts (and the site).

Trevor

[1] http://maven.apache.org/repository-management.html


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Re: External repository always requires a repository manager?

2010-08-16 Thread Justin Edelson
On 8/16/10 12:23 PM, Trevor Harmon wrote:
 On Aug 16, 2010, at 7:20 AM, Justin Edelson wrote:
 
 But if you are a single developer, I'm not sure what value you are
 looking to get out of this. Your local Maven repository acts as a local
 cache, so unless you need to blow this away with some regularity, what's
 the point?
 
 Well, I'm a single developer now, but before long the project will grow, and 
 maybe spawn new projects.
 I'd prefer to learn the ins and outs of repositories when the project is 
 small and manageable.
If you want to have the infrastructure you'll need when the project
*has* grown, then you should be using a repository manager. End of
story. If you don't or can't use a repository manager now (and I totally
understand why this is the case), then you're stuck with what you have.

One in and out to learn is that your distinction of internal and
external repositories isn't found in Maven. Maven has two types of
repositories: local and remote. You have exactly one local repository
(~/.m2/repository, although this is configurable) and any number of
remote repositories. The concept of a repository manager is external
to Maven. Maven doesn't know if you use a repository manager. Maven
doesn't care.

Don't get me wrong - everyone should use a repository manager.

 I was also intrigued by the promise to shave minutes off a build [1] and 
 was wondering if this does in fact
 require a repository manager or could be accomplished more simply.
This requires a pre-populated cache. As a single developer, you will
never have a pre-populated cache unless you either a) use a second
computer or b) delete the contents of your local repository.

 Also, I just wanted to be a good Maven citizen and take a load off Central, 
 if that wasn't too hard to do.
Again, as a single developer, it isn't possible to take load off Central
(or mirrors) because you always need to download artifacts at least
once. And unless you do the things I said above, you never need to
download artifacts *more than once*.

 
 But perhaps the most important reason is that I need to deploy customized 
 versions of some Maven plugins.
 There are a couple I'm using on Central that are buggy, and might not be 
 updated for awhile, so I need to
 deploy and use versions that have the bugs fixed. It's not clear to me if I 
 need a repository manager for that,
 or if I can get away with the non-managed repository I have now for deploying 
 project artifacts (and the site).
You don't need a repository manager for this. You can deploy these
artifacts to your own remote repository. Actually, you don't even need a
remote repository for this. You just need to install fixed versions into
your local repository.

Justin

 
 Trevor
 
 [1] http://maven.apache.org/repository-management.html
 
 
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Re: External repository always requires a repository manager?

2010-08-16 Thread Trevor Harmon

On Aug 16, 2010, at 10:18 AM, Justin Edelson wrote:


One in and out to learn is that your distinction of internal and
external repositories isn't found in Maven.


I found it here:

http://docs.codehaus.org/display/MAVENUSER/Maven+Concepts+Repositories

Is the term external repository not valid?

Also, I just wanted to be a good Maven citizen and take a load off  
Central, if that wasn't too hard to do.
Again, as a single developer, it isn't possible to take load off  
Central

(or mirrors) because you always need to download artifacts at least
once. And unless you do the things I said above, you never need to
download artifacts *more than once*.


I guess I was thinking of SNAPSHOT dependencies, in which case Central  
would be queried on every build, right? But then, I never depend on  
SNAPSHOT versions of external artifacts, so yeah, it wouldn't make  
much difference.


But perhaps the most important reason is that I need to deploy  
customized versions of some Maven plugins.
There are a couple I'm using on Central that are buggy, and might  
not be updated for awhile, so I need to
deploy and use versions that have the bugs fixed. It's not clear to  
me if I need a repository manager for that,
or if I can get away with the non-managed repository I have now for  
deploying project artifacts (and the site).

You don't need a repository manager for this. You can deploy these
artifacts to your own remote repository.


Okay, let me make sure I understand this. Say I've got a main artifact  
and a customized plugin that it depends on. I can configure the plugin  
to deploy to my own remote repository by adding the repository info to  
the plugin POM's distributionManagement. So now the plugin is  
available in my repository. But here's where I get a little  
confused... How does the main artifact know how to retrieve the  
deployed plugin from my remote repository? Do I simply add the remote  
repository URL to the main POM's pluginRepositories? (This seems to  
be discouraged: I have yet to hear a convincing argument for doing  
so [1]) Or should I add it to repositories? Or somewhere else?


Thanks,

Trevor

[1] http://maven.apache.org/pom.html#Plugin_Repositories


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Re: External repository always requires a repository manager?

2010-08-16 Thread Justin Edelson
On 8/16/10 3:04 PM, Trevor Harmon wrote:
 On Aug 16, 2010, at 10:18 AM, Justin Edelson wrote:
 
 One in and out to learn is that your distinction of internal and
 external repositories isn't found in Maven.
 
 I found it here:
 
 http://docs.codehaus.org/display/MAVENUSER/Maven+Concepts+Repositories
 
 Is the term external repository not valid?

You'll note that this page is under Proposed Documentation and says I
expect to have it done no later than 2006-11-05 :)

There is a valid distinction here, but it isn't one that Maven makes...
What I was trying to say is that all Maven knows about is local and
remote repositories. The external vs. internal is a useful
distinction from a management/support/administrative context (Nexus
refers to these as proxy vs. hosted), but they're both just remote
repositories to Maven.

 
 Also, I just wanted to be a good Maven citizen and take a load off
 Central, if that wasn't too hard to do.
 Again, as a single developer, it isn't possible to take load off Central
 (or mirrors) because you always need to download artifacts at least
 once. And unless you do the things I said above, you never need to
 download artifacts *more than once*.
 
 I guess I was thinking of SNAPSHOT dependencies, in which case Central
 would be queried on every build, right? But then, I never depend on
 SNAPSHOT versions of external artifacts, so yeah, it wouldn't make much
 difference.
Central doesn't store SNAPSHOT, so if you're querying central for
SNAPSHOTs, that's a configuration problem.

 
 But perhaps the most important reason is that I need to deploy
 customized versions of some Maven plugins.
 There are a couple I'm using on Central that are buggy, and might not
 be updated for awhile, so I need to
 deploy and use versions that have the bugs fixed. It's not clear to
 me if I need a repository manager for that,
 or if I can get away with the non-managed repository I have now for
 deploying project artifacts (and the site).
 You don't need a repository manager for this. You can deploy these
 artifacts to your own remote repository.
 
 Okay, let me make sure I understand this. Say I've got a main artifact
 and a customized plugin that it depends on. I can configure the plugin
 to deploy to my own remote repository by adding the repository info to
 the plugin POM's distributionManagement.
I would use altDeploymentRepository instead of modifying the POM.
http://maven.apache.org/plugins/maven-deploy-plugin/deploy-mojo.html#altDeploymentRepository

So the full workflow is:
* Fork the plugin's source into a new git repository.
* Change the version number to illustrate that this is your patched version
* Modify code to fix bugs
* Submit patches upstream (to be nice)
* run mvn -DaltDeploymentRepository=foo::default::scp://myrepo/foo deploy

 So now the plugin is
 available in my repository. But here's where I get a little confused...
 How does the main artifact know how to retrieve the deployed plugin from
 my remote repository? Do I simply add the remote repository URL to the
 main POM's pluginRepositories? (This seems to be discouraged: I have
 yet to hear a convincing argument for doing so [1]) Or should I add it
 to repositories? Or somewhere else?

The repository to which you've deployed the plugin should be configured
in your settings.xml as a pluginRepository AND a repository. You should
*also* configure the version number to explicitly be the modified
version number.

HTH,
Justin

 
 Thanks,
 
 Trevor
 
 [1] http://maven.apache.org/pom.html#Plugin_Repositories
 
 
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Re: External repository always requires a repository manager?

2010-08-16 Thread Trevor Harmon

On Aug 16, 2010, at 12:29 PM, Justin Edelson wrote:

Okay, let me make sure I understand this. Say I've got a main  
artifact
and a customized plugin that it depends on. I can configure the  
plugin
to deploy to my own remote repository by adding the repository info  
to

the plugin POM's distributionManagement.

I would use altDeploymentRepository instead of modifying the POM.
http://maven.apache.org/plugins/maven-deploy-plugin/deploy-mojo.html#altDeploymentRepository

...
* run mvn -DaltDeploymentRepository=foo::default::scp://myrepo/foo  
deploy


I don't see the advantage of altDeploymentRepository. What's wrong  
with modifying the POM? I'd prefer not to have to remember a command  
line parameter and just do a simple mvn deploy.


Trevor


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RE: External repository always requires a repository manager?

2010-08-16 Thread Haszlakiewicz, Eric
-Original Message-
From: Trevor Harmon [mailto:tre...@vocaro.com]
On Aug 16, 2010, at 1:20 AM, Stephen Connolly wrote:
 Your life would be much easier using a repository manager for your
 internal repository.  Nexus is almost trivial to set up, for
example.

It is trivial to set up *if* you have the necessary permissions to set
up
the service. In my case, I'm an independent contractor, and the only
server
I personally have access to is from one of those shared hosting
providers,
and it's simply not possible to run Jetty or Tanuki in that kind of
environment. My client does have their own servers, but I'd have to
make a
special request to get one of their IT guys to set it up for me. So
unless
you've got root access to your own server... not trivial.

I'm not sure whether this helps you any, but you don't need to run Nexus
as root.  For instance, I run it under it's own userid, on a
greater-than-1024 port that was arbitrarily chosen when we installed it.

Okay, but I'm just not understanding how to configure Maven for that.
Sure,
I could set up a repositories element like this:

repositories
repository
idcentral/id
urlhttp://repo.myserver.com/repository//url
/repository
/repositories

Not quite.  You're probably going to want everything going through the
repository manager.  I ended up modifying the settings.xml file across
all the machines that I have maven installed.  That is probably better
handled through a ~/.m2/settings.xml file, but it works about the same.
The things I added are:

A mirror element, which forces all requests to go through nexus:
  mirror
!--This sends everything else to /public --
idnexus/id
mirrorOf*/mirrorOf
 
urlhttp://repo.mysever.com:5678/nexus/content/groups/public/url
  /mirror  

That /nexus/content/groups/public path maps to a repository group
that I setup in nexus.  Each actual repository on the net (such as
central) are created in nexus as proxy repositories, then added to the
repository group.

A profile element that lists an arbitrary repository:
   profile
   idnexus/id
   repositories
   repository
   idcentral/id
   urlhttp://central/url
   releasesenabledtrue/enabled/releases
 
snapshotsenabledtrue/enabled/snapshots
   /repository
   /repositories
   pluginRepositories
   pluginRepository
...same as repository element...
   /pluginRepository
   /pluginRepositories
   /profile
   activeProfiles
   activeProfilenexus/activeProfile !-- always active --
   /activeProfiles

A server element with the username and password for deploying things:
server
   idnexus/id
   username.../username
   password.../password
/server

And that tells Maven to check the above URL for artifacts before going
out
to repo1.maven.org. But it only knows how to download, not upload. How
can
Maven put the newly downloaded artifacts into this repository? (I
thought
that's what a repository manager is for...)

Uploading happens through the distributionManagment url you put in your
pom.xml file (or possibly a common, shared parent pom file).  e.g.:

project
  ...other pom.xml stuff...

distributionManagement
repository
idnexus/id
uniqueVersionfalse/uniqueVersion
nameReleases/name

urlhttp://repo.myserver.com:5678/nexus/content/repositories/releases/
/url
/repository

!-- 
When a build has a version of foo-SNAPSHOT, this
repository
will be used for the deploy phase.
 --
snapshotRepository
idnexus/id
uniqueVersiontrue/uniqueVersion
nameSnapshots/name

urlhttp://repo.myserver.com:5678/nexus/content/repositories/snapshots/
/url
/snapshotRepository

/distributionManagement
/project

The /nexus/content/repositories/snapshot and .../releases paths are
hosted repositories that were created within Nexus.

Hope this helps.

eric

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RE: External repository always requires a repository manager?

2010-08-16 Thread Haszlakiewicz, Eric
-Original Message-
From: Trevor Harmon [mailto:tre...@vocaro.com]

I don't see the advantage of altDeploymentRepository. What's wrong
with modifying the POM? I'd prefer not to have to remember a command
line parameter and just do a simple mvn deploy.

That sounds useful if you want to do something like deploy a build of
someone else's software to your own repository manager.  That way you
can minimize the number of changes you have to their files. 

eric

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Re: External repository always requires a repository manager?

2010-08-16 Thread Justin Edelson
On Mon, Aug 16, 2010 at 5:53 PM, Trevor Harmon tre...@vocaro.com wrote:
 On Aug 16, 2010, at 12:29 PM, Justin Edelson wrote:

 Okay, let me make sure I understand this. Say I've got a main artifact
 and a customized plugin that it depends on. I can configure the plugin
 to deploy to my own remote repository by adding the repository info to
 the plugin POM's distributionManagement.

 I would use altDeploymentRepository instead of modifying the POM.

 http://maven.apache.org/plugins/maven-deploy-plugin/deploy-mojo.html#altDeploymentRepository

 ...

 * run mvn -DaltDeploymentRepository=foo::default::scp://myrepo/foo deploy

 I don't see the advantage of altDeploymentRepository. What's wrong with
 modifying the POM? I'd prefer not to have to remember a command line
 parameter and just do a simple mvn deploy.

To each his or her own :)

Both have their uses.

Justin

 Trevor


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