Tower Tower - 4 months ago 35
Java Question

JGit and finding the Head

I'm trying to get my hands on the HEAD commit with JGit:

val builder = new FileRepositoryBuilder()
val repo = builder.setGitDir(new File("/www/test-repo"))
.readEnvironment()
.findGitDir()
.build()

val walk: RevWalk = new RevWalk(repo, 100)

val head: ObjectId = repo.resolve(Constants.HEAD)
val headCommit: RevCommit = walk.parseCommit(head)


I find that it opens the repo fine, but
head
value is set to
null
. I wonder why it can't find HEAD?

I'm reading this documentation: http://wiki.eclipse.org/JGit/User_Guide

The repository is constructed just like the doc says, and the
RevWalk
as well. I'm using the latest version of JGit which is
2.0.0.201206130900-r
from http://download.eclipse.org/jgit/maven.

My question: what do I need to change in my code to get JGit to return actual instances of
RevCommit
instead of
null
like it now does?

Update: This code:

val git = new Git(repo)
val logs: Iterable[RevCommit] = git.log().call().asInstanceOf[Iterable[RevCommit]]


Gives me this exception:
No HEAD exists and no explicit starting revision was specified


The exception is odd, because a simple
git rev-parse HEAD
tells me
0b0e8bf2cae9201f30833d93cc248986276a4d75
, which means there is a HEAD in the repository. I've tried different repositories, mine and from other people.

Answer

You need to point to the Git metadata directory (probably /www/test-repo/.git) when you call setGitDir, not to the working directory (/www/test-repo).

I have to admit I'm not sure what findGitDir is supposed to do, but I've run into this problem before and specifying the .git directory worked.

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