Revert "Use current branch as a proxy for a valid git repository"

This reverts commit 8e490d0.

src/main/groovy/nebula/plugin/release/ReleasePlugin.groovy

@@ -74,8 +74,8 @@ class ReleasePlugin implements Plugin<Project> {
         gitCommandUtil.configure(gitRoot, shouldVerifyUserGitConfig)
         gitWriteCommandsUtil.configure(gitRoot)
 
-        String currentBranch = gitCommandUtil.currentBranch()
-        if (!currentBranch) {
+        boolean isGitRepo = gitCommandUtil.isGitRepo()
+        if(!isGitRepo) {
             this.project.version = '0.1.0-dev.0.uncommitted'
             logger.warn("Git repository not found at $gitRoot -- nebula-release tasks will not be available. Use the git.root Gradle property to specify a different directory.")
             return
@@ -126,7 +126,7 @@ class ReleasePlugin implements Plugin<Project> {
 
             TaskProvider<ReleaseCheck> releaseCheck = project.tasks.register(RELEASE_CHECK_TASK_NAME, ReleaseCheck) {
                 it.group = GROUP
-                it.branchName = currentBranch
+                it.branchName = gitCommandUtil.currentBranch()
                 it.patterns = nebulaReleaseExtension
             }
 

src/main/groovy/nebula/plugin/release/git/command/GitReadCommand.groovy

@@ -210,6 +210,23 @@ abstract class IsCurrentBranchBehindRemote extends GitReadCommand {
     }
 }
 
+/**
+ * Used to check if the current directory is a git repo
+ * ex. git rev-parse --is-inside-work-tree -> true OR
+ *    git rev-parse --is-inside-work-tree -> fatal: not a git repository (or any of the parent directories): .git when there isn't a repo
+ */
+abstract class IsGitRepo extends GitReadCommand  {
+
+    @Override
+    String obtain() {
+        try {
+            return !executeGitCommand( "rev-parse").contains("fatal: not a git repository")
+        } catch (Exception e) {
+            return false
+        }
+    }
+}
+
 /**
  * Used to verify if the current branch is tracking a remote branch
  * ex. git rev-parse --abbrev-ref --symbolic-full-name @{u} -> origin/main

src/main/groovy/nebula/plugin/release/git/command/GitReadOnlyCommandUtil.groovy

@@ -14,6 +14,7 @@ class GitReadOnlyCommandUtil implements Serializable {
     private Provider usernameFromLogProvider
     private Provider emailFromLogProvider
     private Provider currentBranchProvider
+    private Provider isGitRepoProvider
     private Provider anyCommitProvider
     private Provider revParseHeadProvider
     private Provider headTagsProvider
@@ -47,6 +48,9 @@ class GitReadOnlyCommandUtil implements Serializable {
         currentBranchProvider = providers.of(CurrentBranch.class) {
             it.parameters.rootDir.set(rootDir)
         }
+        isGitRepoProvider = providers.of(IsGitRepo.class) {
+            it.parameters.rootDir.set(rootDir)
+        }
         anyCommitProvider = providers.of(AnyCommit.class) {
             it.parameters.rootDir.set(rootDir)
         }
@@ -105,6 +109,14 @@ class GitReadOnlyCommandUtil implements Serializable {
         }
     }
 
+    Boolean isGitRepo() {
+        try {
+            return Boolean.valueOf(isGitRepoProvider.get().toString())
+        } catch (Exception e) {
+            return false
+        }
+    }
+
     Boolean hasCommit() {
         try {
             String describe = anyCommitProvider.get().toString()