GitClient uses repository root instead of workspace root

app/src/main/kotlin/org/virtuslab/bazelsteward/app/AppBuilder.kt

@@ -92,7 +92,7 @@ object AppBuilder {
     val mavenDataExtractor = MavenDataExtractor(appConfig.workspaceRoot)
     val mavenRepository = MavenRepository()
     val updateLogic = UpdateLogic()
-    val gitOperations = GitOperations(appConfig.workspaceRoot, appConfig.baseBranch)
+    val gitOperations = runBlocking { GitOperations.resolve(appConfig.workspaceRoot, appConfig.baseBranch) }
     val gitPlatform = if (github) {
       GithubPlatform.create(env, appConfig.baseBranch, appConfig.gitAuthor)
     } else {

core/src/main/kotlin/org/virtuslab/bazelsteward/core/common/CommandRunner.kt

@@ -19,7 +19,7 @@ class CommandRunner {
       return runForOutput(command.toList(), directory)
     }
 
-    suspend fun runForOutput(command: List<String>, directory: Path): String {
+    suspend fun runForOutput(command: List<String>, directory: Path? = null): String {
       val result = run(command, directory)
       if (result.isSuccess) {
         return result.stdout
@@ -29,10 +29,13 @@ class CommandRunner {
       }
     }
 
-    suspend fun run(command: List<String>, directory: Path): Result {
+    suspend fun run(command: List<String>, directory: Path?): Result {
       logger.info { command.joinToString(" ") { if (it.contains(" ")) """"$it"""" else it } }
       return withContext(Dispatchers.IO) {
-        val process = ProcessBuilder(command).directory(directory.toFile()).start()
+        val processBuilder = ProcessBuilder(command).apply {
+          directory?.let { directory(it.toFile()) }
+        }
+        val process = processBuilder.start()
           .onExit().await()
         val stdout = process.inputStream.bufferedReader().use { it.readText() }
         val stderr = process.errorStream.bufferedReader().use { it.readText() }

core/src/main/kotlin/org/virtuslab/bazelsteward/core/common/GitClient.kt

@@ -5,7 +5,10 @@ import java.nio.file.Path
 
 class GitClient(private val repositoryRoot: Path) {
   private val quiet = "--quiet"
-  private val git = runBlocking { CommandRunner.runForOutput(listOf("sh", "-c", "which git"), repositoryRoot).trim() }
+
+  companion object {
+    private val git = runBlocking { CommandRunner.runForOutput(listOf("sh", "-c", "which git")).trim() }
+  }
 
   suspend fun checkout(target: String, newBranch: Boolean = false) {
     val b = if (newBranch) "-b" else null

core/src/main/kotlin/org/virtuslab/bazelsteward/core/common/GitOperations.kt

@@ -4,6 +4,7 @@ import mu.KotlinLogging
 import org.virtuslab.bazelsteward.core.GitBranch
 import java.lang.RuntimeException
 import java.nio.file.Path
+import kotlin.io.path.Path
 import kotlin.io.path.readText
 import kotlin.io.path.writeText
 
@@ -21,8 +22,17 @@ data class CommitRequest(
 
 private val logger = KotlinLogging.logger {}
 
-class GitOperations(workspaceRoot: Path, private val baseBranch: String) {
-  private val git = GitClient(workspaceRoot)
+class GitOperations(repositoryRoot: Path, private val baseBranch: String) {
+
+  companion object {
+    suspend fun resolve(workspaceRoot: Path, baseBranch: String): GitOperations {
+      val initial = GitClient(workspaceRoot)
+      val repositoryRoot = initial.run("rev-parse", "--show-toplevel").trim().let { Path(it) }
+      return GitOperations(repositoryRoot, baseBranch)
+    }
+  }
+
+  private val git = GitClient(repositoryRoot)
 
   suspend fun checkoutBaseBranch() {
     git.checkout(baseBranch)