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Automatic worktree detection #243

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Automatic worktree detection #243

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85dc579
Add worktree scripted test
steinybot Jun 12, 2024
80f9f3d
Automatically detect worktree support
steinybot Jun 12, 2024
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Automatically detect worktree support
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@steinybot
steinybot committed Jun 12, 2024
commit 80f9f3d0cf947c2aeab13cf78a9caf08ccb59b0d
19 changes: 17 additions & 2 deletions src/main/scala/com/github/sbt/git/GitPlugin.scala
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Original file line number Diff line number Diff line change
@@ -112,8 +112,8 @@ object SbtGit {
// Build settings.
import GitKeys._
def buildSettings = Seq(
useConsoleForROGit := false,
gitReader := new DefaultReadableGit(baseDirectory.value, if (useConsoleForROGit.value) Some(new ConsoleGitReadableOnly(ConsoleGitRunner, file("."), sLog.value)) else None),
useConsoleForROGit := isGitLinkedRepo(baseDirectory.value),
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It would be nice if we could check if jgit v7 is used and if so make useConsoleForROGit false, no matter if we are in a linked repo or not (because jgit 7 supports worktrees, read). Like:

    useConsoleForROGit := jGitVersionLtOrEq6 && isGitLinkedRepo(baseDirectory.value),

I looked into jgit but they do not publish the version in a variable nor method... So I don't see a way of doing this easily.

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On Maven Central we can find the latest jgit v6 and first v7 version published. The diff is quite big, most of the things we don't need to look at.
So I provide my own html rendered diff here from this command:

git diff v6.10.0.202406032230-r..v7.0.0.202409031743-r org.eclipse.jgit

You can see in v7 the class org.eclipse.jgit.lib.Constants added the GITDIR_FILE constant which is directly related to git worktree.

Would it be able to make use of reflection and check if the Contants class contains the field GITDIR_FILE and if so, we can treat the jgit version on the classpath as one that supports git worktree?
Like:

    useConsoleForROGit := !jGitWithWorktreeSupportDetected() && isGitLinkedRepo(baseDirectory.value),

and in the jGitWithWorktreeSupportDetected method put the reflection code?

What do you think?

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@eed3si9n eed3si9n Oct 17, 2024 •
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Stepping back a bit, instead of making the automatic detection more complicated, would it make sense to make this more of a machine-wide setting that someone could always opt out of JGit (or opt into JGit)? Also in general, I don't really get the motivation behind JGit. Is the assumption that someone could be working on an opensource project but somehow do not have git installed on their PATH?

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See also sbt-pgp. In sbt/sbt-pgp#146, I defaulted to using command line gpg and I think the plugin became significantly more reliable because it relied less on the never-ending emulation of gpg via Bouncy Castle.

gitReader := new DefaultReadableGit(baseDirectory.value, if (useConsoleForROGit.value) Some(new ConsoleGitReadableOnly(ConsoleGitRunner, baseDirectory.value, sLog.value)) else None),
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Was this intentionally "." or was that an oversight? Without this it doesn't work when the meta build is the one with the worktree.

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Likely not an oversight, but apparently this was made in an attempt to work with worktree as well:
1fa3ca5

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@steinybot steinybot Sep 18, 2024 •
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. works when the main build has the worktree which is likely what the first implementation was solving for. During my testing I encountered the case where the meta build had the worktree and so . does not work. So I think baseDirectory.value is the correct approach as it should work for both cases. It is probably not a real problem anyway since I doubt anyone would ever set it up like this. Do you agree?

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It is probably not a real problem anyway since I doubt anyone would ever set it up like this. Do you agree?

I don't even know what a worktree is, so I'm like 🤷

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Ah fair enough. They are pretty neat. Essentially they allow you to checkout a branch to a different directory without having to have a completely separate clone. So it is almost always going to be at the local root project base directory (or higher), just like a normal .git directory would be.

gitRunner := ConsoleGitRunner,
gitHeadCommit := gitReader.value.withGit(_.headCommitSha),
gitHeadMessage := gitReader.value.withGit(_.headCommitMessage),
@@ -126,6 +126,21 @@ object SbtGit {
ThisBuild / gitUncommittedChanges := gitReader.value.withGit(_.hasUncommittedChanges),
scmInfo := parseScmInfo(gitReader.value.withGit(_.remoteOrigin))
)

private def isGitLinkedRepo(dir: File): Boolean =
isGitWorktreeDir(Option(System.getenv("GIT_DIR")).fold(dir)(file))

@scala.annotation.tailrec
private def isGitWorktreeDir(dir: File): Boolean = {
val maybeGit = dir / ".git"
// In a linked worktree, .git is a file that contains the path to the main worktree.
if (maybeGit.exists()) maybeGit.isFile
else Option(dir.getParentFile) match {
case Some(parent) => isGitWorktreeDir(parent)
case None => false
}
}

private[sbt] def parseScmInfo(remoteOrigin: String): Option[ScmInfo] = {
val user = """(?:[^@\/]+@)?"""
val domain = """([^\/]+)"""