Restore workaround for preventing empty commits (#1019)

* Revert "Add symlink support to JGit (#1016)"

This reverts commit 5032696cec.

* Restore workaround for empty commits and document commands

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

* Update app/src/main/java/com/zeapo/pwdstore/git/GitCommandExecutor.kt

app/build.gradle.kts

@@ -118,8 +118,6 @@ dependencies {
     implementation(Dependencies.ThirdParty.jgit) {
         exclude(group = "org.apache.httpcomponents", module = "httpclient")
     }
-    // Loaded dynamically by JGit to provide symlink support
-    implementation(Dependencies.ThirdParty.jgit_java7)
     implementation(Dependencies.ThirdParty.jsch)
     implementation(Dependencies.ThirdParty.sshj)
     implementation(Dependencies.ThirdParty.bouncycastle)

app/src/main/java/com/zeapo/pwdstore/crypto/PasswordCreationActivity.kt

@@ -44,7 +44,6 @@ import kotlinx.coroutines.launch
 import me.msfjarvis.openpgpktx.util.OpenPgpApi
 import me.msfjarvis.openpgpktx.util.OpenPgpServiceConnection
 import me.msfjarvis.openpgpktx.util.OpenPgpUtils
-import org.eclipse.jgit.api.Git
 
 class PasswordCreationActivity : BasePgpActivity(), OpenPgpServiceConnection.OnBound {
 
@@ -328,8 +327,6 @@ class PasswordCreationActivity : BasePgpActivity(), OpenPgpServiceConnection.OnB
                     if (result.resultCode == RESULT_OK) {
                         result.data?.getStringArrayExtra(OpenPgpApi.EXTRA_KEY_IDS)?.let { keyIds ->
                             gpgIdentifierFile.writeText(keyIds.joinToString("\n"))
-                            val repo = PasswordRepository.getRepository(null)
-                            if (repo != null) {
                             lifecycleScope.launch {
                                 commitChange(
                                     getString(
@@ -338,7 +335,6 @@ class PasswordCreationActivity : BasePgpActivity(), OpenPgpServiceConnection.OnB
                                     )
                                 )
                             }
-                            }
                             encrypt(data)
                         }
                     }
@@ -430,10 +426,6 @@ class PasswordCreationActivity : BasePgpActivity(), OpenPgpServiceConnection.OnB
                                     returnIntent.putExtra(RETURN_EXTRA_USERNAME, username)
                                 }
 
-                                val repo = PasswordRepository.getRepository(null)
-                                if (repo != null) {
-                                    val status = Git(repo).status().call()
-                                    if (status.modified.isNotEmpty()) {
                                 lifecycleScope.launch {
                                     commitChange(
                                         getString(
@@ -442,8 +434,6 @@ class PasswordCreationActivity : BasePgpActivity(), OpenPgpServiceConnection.OnB
                                         )
                                     )
                                 }
-                                    }
-                                }
 
                                 if (directoryInputLayout.isVisible && directoryInputLayout.isEnabled && oldFileName != null) {
                                     val oldFile = File("$repoPath/${oldCategory?.trim('/')}/$oldFileName.gpg")

app/src/main/java/com/zeapo/pwdstore/git/GitCommandExecutor.kt

@@ -27,6 +27,7 @@ import org.eclipse.jgit.api.CommitCommand
 import org.eclipse.jgit.api.PullCommand
 import org.eclipse.jgit.api.PushCommand
 import org.eclipse.jgit.api.RebaseResult
+import org.eclipse.jgit.api.StatusCommand
 import org.eclipse.jgit.transport.RemoteRefUpdate
 import org.eclipse.jgit.transport.SshSessionFactory
 
@@ -43,16 +44,26 @@ class GitCommandExecutor(
             message = activity.resources.getString(R.string.git_operation_running),
             length = Snackbar.LENGTH_INDEFINITE,
         )
+        // Count the number of uncommitted files
+        var nbChanges = 0
         var operationResult: Result = Result.Ok
         try {
             for (command in operation.commands) {
                 when (command) {
+                    is StatusCommand -> {
+                        val res = withContext(Dispatchers.IO) {
+                            command.call()
+                        }
+                        nbChanges = res.uncommittedChanges.size
+                    }
                     is CommitCommand -> {
                         // the previous status will eventually be used to avoid a commit
+                        if (nbChanges > 0) {
                             withContext(Dispatchers.IO) {
                                 command.call()
                             }
                         }
+                    }
                     is PullCommand -> {
                         val result = withContext(Dispatchers.IO) {
                             command.call()

app/src/main/java/com/zeapo/pwdstore/git/operation/ResetToRemoteOperation.kt

@@ -18,9 +18,14 @@ import org.eclipse.jgit.api.ResetCommand
 class ResetToRemoteOperation(fileDir: File, callingActivity: AppCompatActivity) : GitOperation(fileDir, callingActivity) {
 
     override val commands = arrayOf(
+        // Stage all files
         git.add().addFilepattern("."),
+        // Fetch everything from the origin remote
         git.fetch().setRemote("origin"),
+        // Do a hard reset to the remote branch. Equivalent to git reset --hard origin/$remoteBranch
         git.reset().setRef("origin/$remoteBranch").setMode(ResetCommand.ResetType.HARD),
+        // Force-create $remoteBranch if it doesn't exist. This covers the case where you switched
+        // branches from 'master' to anything else.
         git.branchCreate().setName(remoteBranch).setForce(true),
     )
 

app/src/main/java/com/zeapo/pwdstore/git/operation/SyncOperation.kt

@@ -17,9 +17,15 @@ import java.io.File
 class SyncOperation(fileDir: File, callingActivity: AppCompatActivity) : GitOperation(fileDir, callingActivity) {
 
     override val commands = arrayOf(
+        // Stage all files
         git.add().addFilepattern("."),
+        // Populate the changed files count
+        git.status(),
+        // Commit everything! If needed, obviously.
         git.commit().setAll(true).setMessage("[Android Password Store] Sync"),
+        // Pull and rebase on top of the remote branch
         git.pull().setRebase(true).setRemote("origin"),
+        // Push it all back
         git.push().setPushAll().setRemote("origin"),
     )
 

app/src/main/java/com/zeapo/pwdstore/utils/Extensions.kt

@@ -111,7 +111,11 @@ suspend fun FragmentActivity.commitChange(
     }
     object : GitOperation(getRepositoryDirectory(), this@commitChange) {
         override val commands = arrayOf(
+            // Stage all files
             git.add().addFilepattern("."),
+            // Populate the changed files count
+            git.status(),
+            // Commit everything! If anything changed, that is.
             git.commit().setAll(true).setMessage(message),
         )
 

buildSrc/src/main/java/Dependencies.kt

@@ -53,7 +53,6 @@ object Dependencies {
         const val fastscroll = "me.zhanghai.android.fastscroll:library:1.1.4"
         const val jsch = "com.jcraft:jsch:0.1.55"
         const val jgit = "org.eclipse.jgit:org.eclipse.jgit:3.7.1.201504261725-r"
-        const val jgit_java7 = "org.eclipse.jgit:org.eclipse.jgit.java7:3.7.1.201504261725-r"
         const val leakcanary = "com.squareup.leakcanary:leakcanary-android:2.4"
         const val plumber = "com.squareup.leakcanary:plumber-android:2.4"
         const val sshj = "com.hierynomus:sshj:0.29.0"