Use only jgit (#94)

* drop native git

* to string

* remove walk.close

Author: delta003

src/main/java/com/palantir/gradle/gitversion/JGitDescribe.java

@@ -64,6 +64,7 @@ private List<String> revList(ObjectId initialObjectId) throws IOException {
 
         Repository repo = git.getRepository();
         try (RevWalk walk = new RevWalk(repo)) {
+            walk.setRetainBody(false);
             RevCommit head = walk.parseCommit(initialObjectId);
 
             while (true) {
@@ -88,16 +89,19 @@ private Map<String, RefWithTagName> mapCommitsToTags(Git git) {
         // Maps commit hash to list of all refs pointing to given commit hash.
         // All keys in this map should be same as commit hashes in 'git show-ref --tags -d'
         Map<String, RefWithTagName> commitHashToTag = new HashMap<>();
-        for (Map.Entry<String, Ref> entry : git.getRepository().getTags().entrySet()) {
-            RefWithTagName refWithTagName = new RefWithTagName(entry.getValue(), entry.getKey());
-
-            ObjectId peeledRef = refWithTagName.getRef().getPeeledObjectId();
-            if (peeledRef == null) {
-                // lightweight tag (commit object)
-                updateCommitHashMap(commitHashToTag, comparator, entry.getValue().getObjectId(), refWithTagName);
+        Repository repository = git.getRepository();
+        for (Map.Entry<String, Ref> entry : repository.getTags().entrySet()) {
+            Ref peeledRef = repository.peel(entry.getValue());
+            RefWithTagName refWithTagName = new RefWithTagName(peeledRef, entry.getKey());
+
+            // Peel ref object
+            ObjectId peeledObjectId = peeledRef.getPeeledObjectId();
+            if (peeledObjectId == null) {
+                // Lightweight tag (commit object)
+                updateCommitHashMap(commitHashToTag, comparator, peeledRef.getObjectId(), refWithTagName);
             } else {
-                // annotated tag (tag object)
-                updateCommitHashMap(commitHashToTag, comparator, peeledRef, refWithTagName);
+                // Annotated tag (tag object)
+                updateCommitHashMap(commitHashToTag, comparator, peeledObjectId, refWithTagName);
             }
         }
         return commitHashToTag;

src/main/java/com/palantir/gradle/gitversion/NativeGitDescribe.java

@@ -49,7 +49,7 @@ private String description() {
 
         String rawDescription = expensiveComputeRawDescription();
         maybeCachedDescription = rawDescription == null ?
-                rawDescription : rawDescription.replaceFirst("^" + args.getPrefix(), "");
+                null : rawDescription.replaceFirst("^" + args.getPrefix(), "");
         return maybeCachedDescription;
     }
 
@@ -59,23 +59,7 @@ private String expensiveComputeRawDescription() {
             return null;
         }
 
-        String nativeGitDescribe = new NativeGitDescribe(git.getRepository().getDirectory())
-                .describe(args.getPrefix());
-        String jgitDescribe = new JGitDescribe(git)
-                .describe(args.getPrefix());
-
-        // If native failed, return JGit one
-        if (nativeGitDescribe == null) {
-            return jgitDescribe;
-        }
-
-        // If native succeeded, make sure it's same as JGit one
-        if (!nativeGitDescribe.equals(jgitDescribe)) {
-            throw new IllegalStateException(String.format("Inconsistent git describe: native was %s and jgit was %s. " +
-                    "Please report this on github.com/palantir/gradle-git-version", nativeGitDescribe, jgitDescribe));
-        }
-
-        return jgitDescribe;
+        return new JGitDescribe(git).describe(args.getPrefix());
     }
 
     private boolean isRepoEmpty() {
@@ -141,4 +125,19 @@ public String getBranchName() throws IOException {
 
         return ref.getName().substring(Constants.R_HEADS.length());
     }
+
+    @Override
+    public String toString() {
+        try {
+            return String.format("VersionDetails(%s, %s, %s, %s, %s)",
+                    getVersion(),
+                    getGitHash(),
+                    getGitHashFull(),
+                    getBranchName(),
+                    getIsCleanTag()
+            );
+        } catch (IOException e) {
+            return null;
+        }
+    }
 }