Newbie questions regarding jgit

Newbie questions regarding jgit

[Farrukh Najmi]

Hi all,

I am git newbie and looking to use jgit in a servlet endpoint.

Where can I find a public maven repo for gjit? It seems there is one 
somewhere because of the following file in src tree:

jgit-maven/jgit/pom.xml

For now I have built the jar using /make_jgit.sh and installed the pom 
manually using m

mvn install:install-file -DpomFile=jgit-maven/jgit/pom.xml -Dfile=jgit.jar

I have added the following dependency to my maven project's pom.xml:

   <dependency>
     <groupId>org.spearce</groupId>
     <artifactId>jgit</artifactId>
     <version>0.4-SNAPSHOT</version>
   </dependency>

Now I am wondering where to begin to learn how to do the equivalent of 
the following commands via the gjit Java API:

    * git add /file/
    * git rm /file/
    * git mv /file
    * Whatever is the git way to get a specific version of a file


I am hoping that there aremore docs, samples, tutorials etc. somewhere 
that I am missing. Thanks for any help you can provide. Some pointers or 
code fragments would be terrific.

-- 
Regards,
Farrukh Najmi

Web: http://www.wellfleetsoftware.com

Re: Newbie questions regarding jgit

[Farrukh Najmi]

I should clarify that I am not using eclipse nor am I using any GUI. My 
objective is to have Java API access to git from within a servlet using 
jgit. At present, all I have to go on is javadoc and its not clear where 
to begin if I simply wish to create, read and update files in a git repo 
from within the servlet java code.

TIA for your help.

Farrukh Najmi wrote:
>
> Hi all,
>
> I am git newbie and looking to use jgit in a servlet endpoint.
>
> Where can I find a public maven repo for gjit? It seems there is one 
> somewhere because of the following file in src tree:
>
> jgit-maven/jgit/pom.xml
>
> For now I have built the jar using /make_jgit.sh and installed the pom 
> manually using m
>
> mvn install:install-file -DpomFile=jgit-maven/jgit/pom.xml 
> -Dfile=jgit.jar
>
> I have added the following dependency to my maven project's pom.xml:
>
>   <dependency>
>     <groupId>org.spearce</groupId>
>     <artifactId>jgit</artifactId>
>     <version>0.4-SNAPSHOT</version>
>   </dependency>
>
> Now I am wondering where to begin to learn how to do the equivalent of 
> the following commands via the gjit Java API:
>
>    * git add /file/
>    * git rm /file/
>    * git mv /file
>    * Whatever is the git way to get a specific version of a file
>
>
> I am hoping that there aremore docs, samples, tutorials etc. somewhere 
> that I am missing. Thanks for any help you can provide. Some pointers 
> or code fragments would be terrific.
>


-- 
Regards,
Farrukh Najmi

Web: http://www.wellfleetsoftware.com

Re: Newbie questions regarding jgit

[Jonas Fonseca]

On Tue, Nov 11, 2008 at 21:44, Farrukh Najmi
<farrukh@wellfleetsoftware.com> wrote:
> Hi all,

Hello,

> I am git newbie and looking to use jgit in a servlet endpoint.

Sounds interesting. I have been thinking about how hard it would be to
write a very simpe jgitweb kind of thing and am very interested to
hear more about your experiences.

> Where can I find a public maven repo for gjit? It seems there is one
> somewhere because of the following file in src tree:

I would also like to have a public available maven repository for
JGit. If Shawn or Robin acks, I can look into hosting one in the SVN
area of the Google Code project page. Given the lack of a real release
cycle it probably only makes sense to have a snapshot repository.

> Now I am wondering where to begin to learn how to do the equivalent of the
> following commands via the gjit Java API:
>
>   * git add /file/
>   * git rm /file/
>   * git mv /file
>   * Whatever is the git way to get a specific version of a file

JGit currently has two APIs for working with the index, which will
allow you to add, remove and move data around in the tree. In nbgit I
ended up using GitIndex, which I found easier to figure out. As I
understand it, in the long run you want to use the DirCache API, but
it is still a work in progress.

> I am hoping that there aremore docs, samples, tutorials etc. somewhere that
> I am missing. Thanks for any help you can provide. Some pointers or code
> fragments would be terrific.

I started working on a tutorial for JGit, but didn't get very far so
it mostly consists of stub pages.

 - http://code.google.com/docreader/#p=egit&s=egit&t=JGitTutorial

I have been working on moving the tutorial to maven project before
starting to write the more code heavy topics. This would make it
possible to include code snippets in the tutorial, while also allowing
to compile and test the examples.

-- 
Jonas Fonseca

Re: Newbie questions regarding jgit

[Shawn O. Pearce]

Jonas Fonseca <jonas.fonseca@gmail.com> wrote:
> 
> I would also like to have a public available maven repository for
> JGit. If Shawn or Robin acks, I can look into hosting one in the SVN
> area of the Google Code project page. Given the lack of a real release
> cycle it probably only makes sense to have a snapshot repository.

I have an account on kernel.org and was planning on hosting snapshots
there, but I haven't had time to think about setting up a jgit area
and pushing something into it.  ;-)

We could also just host it in SVN in Google Code.  I can give
you admin rights on the egit project if you want to set it up and
maintain it there.  The downside is you need to use svn or git-svn
to upload files to it, right?

-- 
Shawn.

Re: Newbie questions regarding jgit

[Jonas Fonseca]

On Tue, Nov 11, 2008 at 22:44, Shawn O. Pearce <spearce@spearce.org> wrote:
> Jonas Fonseca <jonas.fonseca@gmail.com> wrote:
>> I would also like to have a public available maven repository for
>> JGit. If Shawn or Robin acks, I can look into hosting one in the SVN
>> area of the Google Code project page. Given the lack of a real release
>> cycle it probably only makes sense to have a snapshot repository.
>
> I have an account on kernel.org and was planning on hosting snapshots
> there, but I haven't had time to think about setting up a jgit area
> and pushing something into it.  ;-)

If you prefer that ...

> We could also just host it in SVN in Google Code.  I can give
> you admin rights on the egit project if you want to set it up and
> maintain it there.  The downside is you need to use svn or git-svn
> to upload files to it, right?

I don't think admin rights are necessary as long as I have
"commit"/webdav access. And no svn or git-svn interaction should be
needed to upload to the maven repository.

Take a look at the distributionManagement section of the
google-maven-repository:

 - http://google-maven-repository.googlecode.com/svn/repository/com/google/google/1/google-1.pom

Looks pretty easy to set up. About maintaining it, I don't mind doing
"mvn deploy" once in a while, but some kind of update policy should
probably be worked out in any case.

-- 
Jonas Fonseca

Re: Newbie questions regarding jgit

[Shawn O. Pearce]

Jonas Fonseca <jonas.fonseca@gmail.com> wrote:
> 
> I don't think admin rights are necessary as long as I have
> "commit"/webdav access. And no svn or git-svn interaction should be
> needed to upload to the maven repository.
> 
> Take a look at the distributionManagement section of the
> google-maven-repository:
> 
>  - http://google-maven-repository.googlecode.com/svn/repository/com/google/google/1/google-1.pom
> 
> Looks pretty easy to set up. About maintaining it, I don't mind doing
> "mvn deploy" once in a while, but some kind of update policy should
> probably be worked out in any case.

Then have at it.  It sounds like it would be worthwhile setting up.

-- 
Shawn.

[PATCH] Add maven distribution management info for the new snapshot repository

[Jonas Fonseca]

Signed-off-by: Jonas Fonseca <fonseca@diku.dk>
---
 jgit-maven/jgit/pom.xml |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

 Shawn O. Pearce <spearce@spearce.org> wrote Tue, Nov 11, 2008:
 > Jonas Fonseca <jonas.fonseca@gmail.com> wrote:
 > > I don't think admin rights are necessary as long as I have
 > > "commit"/webdav access. And no svn or git-svn interaction should be
 > > needed to upload to the maven repository.
 > 
 > Then have at it.  It sounds like it would be worthwhile setting up.

 Instructions at http://code.google.com/p/egit/wiki/ConfiguringMaven

diff --git a/jgit-maven/jgit/pom.xml b/jgit-maven/jgit/pom.xml
index a123470..c370783 100644
--- a/jgit-maven/jgit/pom.xml
+++ b/jgit-maven/jgit/pom.xml
@@ -185,4 +185,12 @@ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
             <scope>compile</scope>
         </dependency>
     </dependencies>
+    <distributionManagement>
+        <snapshotRepository>
+            <id>jgit-maven-snapshot-repository</id>
+            <name>JGit Maven Snapshot Repository</name>
+            <url>dav:https://egit.googlecode.com/svn/maven/snapshot-repository/</url>
+            <uniqueVersion>true</uniqueVersion>
+        </snapshotRepository>
+    </distributionManagement>
 </project>
-- 
1.6.0.3.866.gc189b

-- 
Jonas Fonseca

Re: [PATCH] Add maven distribution management info for the new snapshot repository

[Shawn O. Pearce]

Jonas Fonseca <fonseca@diku.dk> wrote:
>  Shawn O. Pearce <spearce@spearce.org> wrote Tue, Nov 11, 2008:
>  > Jonas Fonseca <jonas.fonseca@gmail.com> wrote:
>  > > I don't think admin rights are necessary as long as I have
>  > > "commit"/webdav access. And no svn or git-svn interaction should be
>  > > needed to upload to the maven repository.
>  > 
>  > Then have at it.  It sounds like it would be worthwhile setting up.
> 
>  Instructions at http://code.google.com/p/egit/wiki/ConfiguringMaven
> 
> diff --git a/jgit-maven/jgit/pom.xml b/jgit-maven/jgit/pom.xml
> index a123470..c370783 100644
> --- a/jgit-maven/jgit/pom.xml
> +++ b/jgit-maven/jgit/pom.xml
> @@ -185,4 +185,12 @@ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>              <scope>compile</scope>
>          </dependency>
>      </dependencies>
> +    <distributionManagement>
> +        <snapshotRepository>
> +            <id>jgit-maven-snapshot-repository</id>
> +            <name>JGit Maven Snapshot Repository</name>
> +            <url>dav:https://egit.googlecode.com/svn/maven/snapshot-repository/</url>

Shouldn't that be http:// and not https:// ?

The https interface asked me for a username/password, the
http:// one doesn't.  We want this to be public, don't we?

-- 
Shawn.

Re: [PATCH] Add maven distribution management info for the new snapshot repository

[Shawn O. Pearce]

"Shawn O. Pearce" <spearce@spearce.org> wrote:
> Jonas Fonseca <fonseca@diku.dk> wrote:
> > +    <distributionManagement>
> > +        <snapshotRepository>
> > +            <id>jgit-maven-snapshot-repository</id>
> > +            <name>JGit Maven Snapshot Repository</name>
> > +            <url>dav:https://egit.googlecode.com/svn/maven/snapshot-repository/</url>
> 
> Shouldn't that be http:// and not https:// ?

Oh, wait, never mind me.

I guess this makes sense; https:// for the distribution upload,
but the wiki page you added uses plain http:// for download.

Patch applied.
 
-- 
Shawn.

Re: Newbie questions regarding jgit

[Imran M Yousuf]

On Wed, Nov 12, 2008 at 5:11 AM, Shawn O. Pearce <spearce@spearce.org> wrote:
> Jonas Fonseca <jonas.fonseca@gmail.com> wrote:
>>
>> I don't think admin rights are necessary as long as I have
>> "commit"/webdav access. And no svn or git-svn interaction should be
>> needed to upload to the maven repository.
>>
>> Take a look at the distributionManagement section of the
>> google-maven-repository:
>>
>>  - http://google-maven-repository.googlecode.com/svn/repository/com/google/google/1/google-1.pom
>>
>> Looks pretty easy to set up. About maintaining it, I don't mind doing
>> "mvn deploy" once in a while, but some kind of update policy should
>> probably be worked out in any case.
>
> Then have at it.  It sounds like it would be worthwhile setting up.
>

This idea is cool!

> --
> Shawn.
> --
> To unsubscribe from this list: send the line "unsubscribe git" in
> the body of a message to majordomo@vger.kernel.org
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>



-- 
Imran M Yousuf
Entrepreneur & Software Engineer
Smart IT Engineering
Dhaka, Bangladesh
Email: imran@smartitengineering.com
Blog: http://imyousuf-tech.blogs.smartitengineering.com/
Mobile: +880-1711402557

Re: Newbie questions regarding jgit

[Farrukh Najmi]

The jgit team, rocks! You guys are  simply awesome in your 
responsiveness. Thanks for a great project.

Please let me know if I can help with any maven related issues. Here is 
a couple of
links I use to evangelize use of maven in OS projects:

Why Maven Rocks:
<http://farrukhnajmi.blogspot.com/2008/02/why-maven-rocks-in-beginning-there-was.html>

Why Maven - Wiki Page:
<http://ebxmlrr.wiki.sourceforge.net/whymaven>

Here are the main resources I use as reference for maven:

Maven Official Docs:
<http://maven.apache.org/guides/index.html>

Better Builds With Maven:
<http://www.topazproject.org/trac/attachment/wiki/MavenInfo/BetterBuildsWithMaven.pdf?format=raw>

I think it is great that the project supports maven at least partially 
today.
I would suggest the project consider maven for all its 
build/configuration management at some point in future.
It takes a little learning curve initially (most for dev team members 
not users) but pays off handsomely very quickly.

Jonas Fonseca wrote:
...
> On Tue, Nov 11, 2008 at 22:44, Shawn O. Pearce <spearce@spearce.org> wrote:
>   
>> Jonas Fonseca <jonas.fonseca@gmail.com> wrote:
>>     
>>> I would also like to have a public available maven repository for
>>> JGit. If Shawn or Robin acks, I can look into hosting one in the SVN
>>> area of the Google Code project page. Given the lack of a real release
>>> cycle it probably only makes sense to have a snapshot repository.
>>>       
...

-- 
Regards,
Farrukh Najmi

Web: http://www.wellfleetsoftware.com

Re: Newbie questions regarding jgit

[Farrukh Najmi]

Jonas Fonseca wrote:
...
>   
>> Now I am wondering where to begin to learn how to do the equivalent of the
>> following commands via the gjit Java API:
>>
>>   * git add /file/
>>   * git rm /file/
>>   * git mv /file
>>   * Whatever is the git way to get a specific version of a file
>>     
>
> JGit currently has two APIs for working with the index, which will
> allow you to add, remove and move data around in the tree. In nbgit I
> ended up using GitIndex, which I found easier to figure out. As I
> understand it, in the long run you want to use the DirCache API, but
> it is still a work in progress.
>   

I am happy to use GitIndex now and switch to DirCache API later when it 
is ready.
Can I please get some pseudo-code fragments on how to do the use cases I 
identified above?
The javadoc is still not obvious to me.
>   
>> I am hoping that there aremore docs, samples, tutorials etc. somewhere that
>> I am missing. Thanks for any help you can provide. Some pointers or code
>> fragments would be terrific.
>>     
>
> I started working on a tutorial for JGit, but didn't get very far so
> it mostly consists of stub pages.
>
>  - http://code.google.com/docreader/#p=egit&s=egit&t=JGitTutorial
>
> I have been working on moving the tutorial to maven project before
> starting to write the more code heavy topics. This would make it
> possible to include code snippets in the tutorial, while also allowing
> to compile and test the examples.
>   

The wiki is an awesome resource even in its current state. Thank you.
I would be glad to help contribute improvements to wiki if you give me
write privilege. What I could do is take the help I get from the list and
then update wiki carefully as appropriate if you want me to help.

Thanks again to all of you for helping get me bootstrapped with gjit and 
git.

-- 
Regards,
Farrukh Najmi

Web: http://www.wellfleetsoftware.com

Re: Newbie questions regarding jgit

[Farrukh Najmi]

BTW, the context for what I am doing is as follows. I am implementing 
OASIS ebXML Registry/Repository (RegRep) 4 specs:

<http://www.oasis-open.org/committees/download.php/29972>

I would like to use git for the Repository part of the RegRep while a 
relational database will hold the registry part which contains extensive 
metadata about repository files. Later I will also evaluate if I can 
somehow use git for the Registry part so I can leverage versioning 
features of git. I would still need to have the Registry content 
duplicated in relational database to support querying of the metadata. 
The standard eventually needs to support CheckIn/Checkout and I think a 
distributed VCS like git would be very helpful in an implementation.

For those unfamiliar with RegRep as a technology think of it as 
providing added value on top of a generic VCS, database or Content 
Management system.

For my immediate needs, I need to implement a GitRepository class with 
two methods using gjit as shown below. I would appreciate any guidance 
and pseudo-code examples on how to implement these methods. Please keep 
in mind that I am just getting to know git itself and gjit was key to my 
considering git over Mercurial and other distributed VCSs.

public class GitRepositoryManager {

    Repository gitRepo;

    ...

    /**
     * Gets the content of specified file in git Repo.
     *
     * @parameter relativePath the relative path in jitRepo for  desired 
file to get
     * @parameter versionName the versionName for the desired file. It 
will be unmarshalled from String to ObjectId.
     * @return the content of the desired file version packaged as a 
DataHandler.
     */
    public DataHandler get(String relativePath, String versionName) 
throws RepositoryException {
        DataHandler dh = null;

        ...
       
        return dh;
    }

    /**
     * Creates a new version of specified version of file in git Repo.
     *
     * @parameter relativePath the relative path in jitRepo for  desired 
file to get
     * @parameter versionName the versionName for the desired file. It 
will be unmarshalled from String to ObjectId.
     * @parameter content the content of the new version for specified 
file packaged as a DataHandler.
     */
    public void update(String relativePath, String versionName, 
DataHandler content) throws RepositoryException {
        ...
    }

}

Farrukh Najmi wrote:
> Jonas Fonseca wrote:
> ...
>>  
>>> Now I am wondering where to begin to learn how to do the equivalent 
>>> of the
>>> following commands via the gjit Java API:
>>>
>>>   * git add /file/
>>>   * git rm /file/
>>>   * git mv /file
>>>   * Whatever is the git way to get a specific version of a file
>>>     
>>
>> JGit currently has two APIs for working with the index, which will
>> allow you to add, remove and move data around in the tree. In nbgit I
>> ended up using GitIndex, which I found easier to figure out. As I
>> understand it, in the long run you want to use the DirCache API, but
>> it is still a work in progress.
>>   
>
> I am happy to use GitIndex now and switch to DirCache API later when 
> it is ready.
> Can I please get some pseudo-code fragments on how to do the use cases 
> I identified above?
> The javadoc is still not obvious to me.
>>  
>>> I am hoping that there aremore docs, samples, tutorials etc. 
>>> somewhere that
>>> I am missing. Thanks for any help you can provide. Some pointers or 
>>> code
>>> fragments would be terrific.
>>>     
>>
>> I started working on a tutorial for JGit, but didn't get very far so
>> it mostly consists of stub pages.
>>
>>  - http://code.google.com/docreader/#p=egit&s=egit&t=JGitTutorial
>>
>> I have been working on moving the tutorial to maven project before
>> starting to write the more code heavy topics. This would make it
>> possible to include code snippets in the tutorial, while also allowing
>> to compile and test the examples.
>>   
>
> The wiki is an awesome resource even in its current state. Thank you.
> I would be glad to help contribute improvements to wiki if you give me
> write privilege. What I could do is take the help I get from the list and
> then update wiki carefully as appropriate if you want me to help.
>
> Thanks again to all of you for helping get me bootstrapped with gjit 
> and git.
>


-- 
Regards,
Farrukh Najmi

Web: http://www.wellfleetsoftware.com

Re: Newbie questions regarding jgit

[Farrukh Najmi]

So far I have figured out how to get the treeWalk for the path filter as 
shown below.
Now I am lost as to how to get the blob associated with the treeWalk. 
TIA for your help.

   /**
    * Gets the content of specified file in git Repo.
    *
    * @parameter relativePath the relative path in jitRepo for  desired 
file to get
    * @parameter versionName the versionName for the desired file. It 
will be unmarshalled from String to ObjectId.
    * @return the content of the desired file version packaged as a 
DataHandler.
    */
   public DataHandler get(String relativePath, String versionName) 
throws RepositoryException {
            ObjectId retrieveStart = repository.resolve(versionName);
            RevWalk revWalk = new RevWalk(repository);
            RevCommit entry = revWalk.parseCommit(retrieveStart);
            RevTree revTree = entry.getTree();

            TreeWalk treeWalk = TreeWalk.forPath(repository, 
relativePath, revTree);

            //Not sure how to get the blob next
   }

Farrukh Najmi wrote:
....
> For my immediate needs, I need to implement a GitRepository class with 
> two methods using gjit as shown below. I would appreciate any guidance 
> and pseudo-code examples on how to implement these methods. Please 
> keep in mind that I am just getting to know git itself and gjit was 
> key to my considering git over Mercurial and other distributed VCSs.
>
> public class GitRepositoryManager {
>
>    Repository gitRepo;
>
>    ...
>
>    /**
>     * Gets the content of specified file in git Repo.
>     *
>     * @parameter relativePath the relative path in jitRepo for  
> desired file to get
>     * @parameter versionName the versionName for the desired file. It 
> will be unmarshalled from String to ObjectId.
>     * @return the content of the desired file version packaged as a 
> DataHandler.
>     */
>    public DataHandler get(String relativePath, String versionName) 
> throws RepositoryException {
>        DataHandler dh = null;
>
>        ...
>              return dh;
>    }
>
>    /**
>     * Creates a new version of specified version of file in git Repo.
>     *
>     * @parameter relativePath the relative path in jitRepo for  
> desired file to get
>     * @parameter versionName the versionName for the desired file. It 
> will be unmarshalled from String to ObjectId.
>     * @parameter content the content of the new version for specified 
> file packaged as a DataHandler.
>     */
>    public void update(String relativePath, String versionName, 
> DataHandler content) throws RepositoryException {
>        ...
>    }
>
> }
>
> Farrukh Najmi wrote:
>> Jonas Fonseca wrote:
>> ...
>>>  
>>>> Now I am wondering where to begin to learn how to do the equivalent 
>>>> of the
>>>> following commands via the gjit Java API:
>>>>
>>>>   * git add /file/
>>>>   * git rm /file/
>>>>   * git mv /file
>>>>   * Whatever is the git way to get a specific version of a file
>>>>     
>>>
>>> JGit currently has two APIs for working with the index, which will
>>> allow you to add, remove and move data around in the tree. In nbgit I
>>> ended up using GitIndex, which I found easier to figure out. As I
>>> understand it, in the long run you want to use the DirCache API, but
>>> it is still a work in progress.
>>>   
>>
>> I am happy to use GitIndex now and switch to DirCache API later when 
>> it is ready.
>> Can I please get some pseudo-code fragments on how to do the use 
>> cases I identified above?
>> The javadoc is still not obvious to me.
>>>  
>>>> I am hoping that there aremore docs, samples, tutorials etc. 
>>>> somewhere that
>>>> I am missing. Thanks for any help you can provide. Some pointers or 
>>>> code
>>>> fragments would be terrific.
>>>>     
>>>
>>> I started working on a tutorial for JGit, but didn't get very far so
>>> it mostly consists of stub pages.
>>>
>>>  - http://code.google.com/docreader/#p=egit&s=egit&t=JGitTutorial
>>>
>>> I have been working on moving the tutorial to maven project before
>>> starting to write the more code heavy topics. This would make it
>>> possible to include code snippets in the tutorial, while also allowing
>>> to compile and test the examples.
>>>   
>>
>> The wiki is an awesome resource even in its current state. Thank you.
>> I would be glad to help contribute improvements to wiki if you give me
>> write privilege. What I could do is take the help I get from the list 
>> and
>> then update wiki carefully as appropriate if you want me to help.
>>
>> Thanks again to all of you for helping get me bootstrapped with gjit 
>> and git.
>>
>
>


-- 
Regards,
Farrukh Najmi

Web: http://www.wellfleetsoftware.com

Re: Newbie questions regarding jgit

[Jonas Fonseca]

On Wed, Nov 12, 2008 at 18:56, Farrukh Najmi
<farrukh@wellfleetsoftware.com> wrote:
> So far I have figured out how to get the treeWalk for the path filter as
> shown below.
> Now I am lost as to how to get the blob associated with the treeWalk. TIA
> for your help.

For ideas take a look at how the NetBeans git plugin accomplishes some
of the most common git tasks take a look at the GitCommand.java file.
It contains code for adding and removing files, committing updates to
the index. There is also some code trying to get "git-status"
information, but it is not very smart or clean. Something equivalent
to "git cat-file" (getting the blob data) can be seen at line 120:

 - http://github.com/myabc/nbgit/tree/master/src/org/nbgit/util/GitCommand.java#L120

Sorry, I should have suggested this earlier.

-- 
Jonas Fonseca

Re: Newbie questions regarding jgit

[Shawn O. Pearce]

Farrukh Najmi <farrukh@wellfleetsoftware.com> wrote:
>
> So far I have figured out how to get the treeWalk for the path filter as  
> shown below.
> Now I am lost as to how to get the blob associated with the treeWalk.  
> TIA for your help.
>
>   /**
>    * Gets the content of specified file in git Repo.
>    *
>    * @parameter relativePath the relative path in jitRepo for  desired  
> file to get
>    * @parameter versionName the versionName for the desired file. It  
> will be unmarshalled from String to ObjectId.
>    * @return the content of the desired file version packaged as a  
> DataHandler.
>    */
>   public DataHandler get(String relativePath, String versionName) throws 
> RepositoryException {
>            ObjectId retrieveStart = repository.resolve(versionName);
>            RevWalk revWalk = new RevWalk(repository);
>            RevCommit entry = revWalk.parseCommit(retrieveStart);
>            RevTree revTree = entry.getTree();
>
>            TreeWalk treeWalk = TreeWalk.forPath(repository,  
> relativePath, revTree);
>
>            //Not sure how to get the blob next

	if (treeWalk.next()) {
		// Path exists
		if (treeWalk.getFileMode(0).getObjectType() == Constants.OBJ_BLOB) {
			ObjectId blob = treeWalk.getObjectId(0);
		} else {
			// Not a blob, its something else (tree, gitlink)
		}
	} else {
		// Path not found
	}

-- 
Shawn.

Re: Newbie questions regarding jgit

[Robin Rosenberg]

(resend without HTML)
tisdag 11 november 2008 22:12:58 skrev Farrukh Najmi:
> 
> I should clarify that I am not using eclipse nor am I using any GUI. My 
> objective is to have Java API access to git from within a servlet using 
> jgit. At present, all I have to go on is javadoc and its not clear where 
> to begin if I simply wish to create, read and update files in a git repo 
> from within the servlet java code.
>
We do not have a tutorial. The JUnit tests are the best examples on 
how to use the API today. I did some experiement wit J2EE and created
some jsp tags, but that's for JSP only and mostly experimental. To
comply with the JEE spec one should create a resource manager for
Git to deal with scalability when many users try to access repos.

> > I am git newbie and looking to use jgit in a servlet endpoint.
> >
> > Where can I find a public maven repo for gjit? It seems there is one 
> > somewhere because of the following file in src tree:
> >
> > jgit-maven/jgit/pom.xml

We do not use maven ourselves right now, though that might change, so
there is not public maven repository for jgit just yet. What do I need to
do to set it up?

> >
> > For now I have built the jar using /make_jgit.sh and installed the pom 
> > manually using m
> >
> > mvn install:install-file -DpomFile=jgit-maven/jgit/pom.xml 
> > -Dfile=jgit.jar

The pom.xml works for building jgit. cd to the mave dir and type mvn
and watch it build (and run unit tests if you ask it to).

-- robin

Re: Newbie questions regarding jgit

[Robin Rosenberg]

(resend without HTML)
tisdag 11 november 2008 22:37:40 skrev Jonas Fonseca:
> On Tue, Nov 11, 2008 at 21:44, Farrukh Najmi
> <farrukh@wellfleetsoftware.com> wrote:
> > Hi all,
> 
> Hello,
> 
> > I am git newbie and looking to use jgit in a servlet endpoint.
> 
> Sounds interesting. I have been thinking about how hard it would be to
> write a very simpe jgitweb kind of thing and am very interested to
> hear more about your experiences.

Consider this: 
http://www.jgit.org/cgi-bin/gitweb/gitweb.cgi?p=EGIT-jee.git;a=shortlog;h=rr/jeegitweb

It's an toy experiment with taglibs. Unfortunately the JSP doesn't even compile (!) anymore,
maybe someone can spot the error. Something very close to this did work a while ago.

The example jsp is here:
http://www.jgit.org/cgi-bin/gitweb/gitweb.cgi?p=EGIT-jee.git;a=blob;f=org.spearce.jeegit web/WebContent/index.jsp;h=d065d9f5a725a161a640e58e3be4d5b3a0666b5e;hb=fabffb50f0a020ff9b1653c090675bbd56dcc80a

-- robin