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I have investigated the possibilities to control Git from Java. What I have found is :

I tried to write my own Java-wrapper for git with Runtime and ProcessBuilder, but I got problems with the process threads, was waiting for ever for the threads to finish some times.

I then looked into other solutions with APIs. First I tried JavaGit API, but I can't get that to work at all.

Second I tested JGit API, and it is looking great. But I soon find out that I could not set the commit date as I did with my Java-wrapper :

ProcessBuilder pb = new ProcessBuilder("git", "commit", "--date=" + "\"" + customDateString + "\"", "-m \"" + comment + "\"");

I downloaded the JGit source-code to see if I could implement it, but it was too much to read in and I could not find any issue tracker on Github for JGit to make a suggestion.

Can someone here help me do this?
Or tell me where I can write to make a suggestion to the developers?

VonC
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John Master
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2 Answers2

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Easy, as you mention, first download jgit:

C:\> cd C:\Users\VonC\prog\git\
C:\Users\VonC\prog\git> git clone https://github.com/eclipse/jgit
C:\Users\VonC\prog\git> cd jgit

Then search for a test ('tst') which involves "authordate":

C:\Users\VonC\prog\git\jgit>grep -nRHIi authordate *|grep tst

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CommitCommandTest.java:446:              final Date authorDate = new Date(1349621117000L);

That means you can have a look at the org.eclipse.jgit.test.tst.org.eclipse/jgit/api.CommitCommandTest, function commitAmendWithoutAuthorShouldSetOriginalAuthorAndAuthorTime():

You will see how to specify an author and an author date:

final Date authorDate = new Date(1349621117000L);
PersonIdent firstAuthor = new PersonIdent(authorName, authorEmail,
   authorDate, TimeZone.getTimeZone("UTC"));
git.commit().setMessage("initial commit").setAuthor(firstAuthor).call();

Note, as I mention here, the test classes are a good source of documentation/illustration for JGit.

VonC
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    Thank you, I was looking in the wrong place, for me it was logic to find some thing like git.commit().setDate("..."). Your method works, but I also used : git.commit().setCommitter(firstAuthor), before calling the "call()-method" to also change the commit date. – John Master Nov 01 '13 at 16:05
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I had a similar problem some time ago and because JavaGit project seemed a bit dead just forked it, solved some bugs and made some bits going back to work.

You can try it at the Swiss Army Java Git page and also will be glad to help you.

Bit-Man
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