detect error during push

fix #280

app/src/main/java/com/zeapo/pwdstore/git/GitAsyncTask.java

@@ -10,7 +10,10 @@ import com.zeapo.pwdstore.R;
 
 import org.eclipse.jgit.api.CommitCommand;
 import org.eclipse.jgit.api.GitCommand;
+import org.eclipse.jgit.api.PushCommand;
 import org.eclipse.jgit.api.StatusCommand;
+import org.eclipse.jgit.transport.PushResult;
+import org.eclipse.jgit.transport.RemoteRefUpdate;
 
 
 public class GitAsyncTask extends AsyncTask<GitCommand, Integer, String> {
@@ -49,6 +52,29 @@ public class GitAsyncTask extends AsyncTask<GitCommand, Integer, String> {
                     // the previous status will eventually be used to avoid a commit
                     if (nbChanges == null || nbChanges > 0)
                         command.call();
+                }else if (command instanceof PushCommand) {
+                    for (final PushResult result : ((PushCommand) command).call()) {
+                        // Code imported (modified) from Gerrit PushOp, license Apache v2
+                        for (final RemoteRefUpdate rru : result.getRemoteUpdates()) {
+                            switch (rru.getStatus()) {
+                                case REJECTED_NONFASTFORWARD:
+                                    return activity.getString(R.string.git_push_nff_error);
+                                case REJECTED_NODELETE:
+                                case REJECTED_REMOTE_CHANGED:
+                                case NON_EXISTING:
+                                case NOT_ATTEMPTED:
+                                    return activity.getString(R.string.git_push_generic_error) + rru.getStatus().name();
+                                case REJECTED_OTHER_REASON:
+                                    if ("non-fast-forward".equals(rru.getMessage())) {
+                                        return activity.getString(R.string.git_push_other_error);
+                                    } else {
+                                        return activity.getString(R.string.git_push_generic_error) + rru.getMessage();
+                                    }
+                                default:
+                                    break;
+                            }
+                        }
+                    }
                 } else {
                     command.call();
                 }

app/src/main/java/com/zeapo/pwdstore/git/GitOperation.java

@@ -213,10 +213,7 @@ public abstract class GitOperation {
     public void onTaskEnded(String result) {
         new AlertDialog.Builder(callingActivity).
                 setTitle(callingActivity.getResources().getString(R.string.jgit_error_dialog_title)).
-                setMessage("Error occurred during a Git operation, "
+                setMessage(callingActivity.getResources().getString(R.string.jgit_error_dialog_text) + result).
-                        + callingActivity.getResources().getString(R.string.jgit_error_dialog_text)
-                        + result
-                        + "\nPlease check the FAQ for possible reasons why this error might occur.").
                 setPositiveButton(callingActivity.getResources().getString(R.string.dialog_ok), new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int i) {

app/src/main/java/com/zeapo/pwdstore/git/PushOperation.java

@@ -48,10 +48,7 @@ public class PushOperation extends GitOperation {
         // TODO handle the "Nothing to push" case
         new AlertDialog.Builder(callingActivity).
                 setTitle(callingActivity.getResources().getString(R.string.jgit_error_dialog_title)).
-                setMessage("Error occured during the push operation, "
+                setMessage(callingActivity.getString(R.string.jgit_error_push_dialog_text) + result).
-                        + callingActivity.getResources().getString(R.string.jgit_error_dialog_text)
-                        + result
-                        + "\nPlease check the FAQ for possible reasons why this error might occur.").
                 setPositiveButton(callingActivity.getResources().getString(R.string.dialog_ok), new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int i) {

app/src/main/res/values/strings.xml

@@ -204,4 +204,8 @@
     <string name="autofill_ins_1_hint">Screenshot of accessibility services</string>
     <string name="autofill_ins_2_hint">Screenshot of toggle in accessibility services</string>
     <string name="autofill_ins_3_hint">Screenshot of autofill service in action</string>
+    <string name="git_push_nff_error">Push was rejected by remote, run pull before pushing again. You can use Synchronize rather than pull/push as it implements both</string>
+    <string name="git_push_generic_error">Push was rejected by remote, reason:</string>
+    <string name="git_push_other_error">Remote rejected non-fast-forward push. Check receive.denyNonFastForwards variable in config file of destination repository.</string>
+    <string name="jgit_error_push_dialog_text">Error occurred during the push operation:</string>
 </resources>