java – Git fetch使用jgit失败：Remote没有可用于获取

我有一个位于main.git的裸仓库,我试图在另一个仓库中测试一个分支(foo,让我们说),测试,它只是刚刚被git init’d：

fetchtest/
  |- main.git/
  |- test/
       |- .git/

使用常规git命令,我可以执行git fetch ../main.git foo：foo,这将在test /中创建一个新的分支foo并获取分支所需的对象.然后我想做同样的事情但是以编程方式使用JGit,即不使用git CLI但只使用Java代码.我无法使用git CLI：

Git git = Git.init().setDirectory(new File("fetchtest/test/")).call();

git.fetch().setRemote(new File("../main.git"))
           .setRefSpecs(new RefSpec("foo:foo"))
           .call();

但它只是错误：

org.eclipse.jgit.api.errors.TransportException: Remote does not have foo available for fetch.
    at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:137)
    // ......
Caused by: org.eclipse.jgit.errors.TransportException: Remote does not have foo available for fetch.
    at org.eclipse.jgit.transport.FetchProcess.expandSingle(FetchProcess.java:349)
    at org.eclipse.jgit.transport.FetchProcess.executeImp(FetchProcess.java:139)
    at org.eclipse.jgit.transport.FetchProcess.execute(FetchProcess.java:113)
    at org.eclipse.jgit.transport.Transport.fetch(Transport.java:1069)
    at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:128)

我如何让它工作？

解决方法:

应该做些什么：

Git git = Git.init().setDirectory(new File("fetchtest/test/")).call();

git.fetch().setRemote(new File("../main.git"))
           .setRefSpecs(new RefSpec("refs/heads/foo:refs/heads/foo"))
           .call();

请注意RefSpec定义.
至少,试试你的例子：

new RefSpec("refs/heads/foo:refs/heads/foo")

RefSpec class提到：

/**
 * Parse a ref specification for use during transport operations.
 * <p>
 * Specifications are typically one of the following forms:
 * <ul>
 * <li><code>refs/head/master</code></li>
 * <li><code>refs/head/master:refs/remotes/origin/master</code></li>
 * <li><code>refs/head/*:refs/remotes/origin/*</code></li>
 * <li><code>+refs/head/master</code></li>
 * <li><code>+refs/head/master:refs/remotes/origin/master</code></li>
 * <li><code>+refs/head/*:refs/remotes/origin/*</code></li>
 * <li><code>:refs/head/master</code></li>
 * </ul>
 *
 * @param spec
 * string describing the specification.
 * @throws IllegalArgumentException
 * the specification is invalid.
*/

所以“refs / head /”似乎是强制性的.

原始答案：

setRemote() function on api.FetchCommand采用名称或URI.

看一下FetchCommandTest的URI定义,我更喜欢让遥控器更加明显：
我宁愿为你的第二个回购(引用你的第一个回购)定义一个命名的遥控器(在下面：“test”),然后获取.

// setup the first repository to fetch from the second repository
final StoredConfig config = db.getConfig();
RemoteConfig remoteConfig = new RemoteConfig(config, "test");
URIish uri = new URIish(db2.getDirectory().toURI().toURL());
remoteConfig.addURI(uri);
remoteConfig.update(config);
config.save();

// create some refs via commits and tag
RevCommit commit = git2.commit().setMessage("initial commit").call();
Ref tagRef = git2.tag().setName("tag").call();

Git git1 = new Git(db);

RefSpec spec = new RefSpec("refs/heads/master:refs/heads/x");
git1.fetch().setRemote("test").setRefSpecs(spec)
.call();

标签：java,git,version-control,jgit,git-fetch
来源： https://codeday.me/bug/20190626/1289703.html