rsend: push phone folders to a home SSH host over rsync

A small Android app for one-way folder backup, a KISS alternative to
Syncthing. It bundles rsync (built from pinned source via the NDK) and
a pure-Go SSH transport, both shipped in the APK as lib*.so and run from
the native library directory.

rsend pins the host key, stores the ed25519 identity Keystore-encrypted,
pushes each folder additively or as a mirror, and runs on demand or on a
WiFi-only schedule. The build is self-contained and reproducible: make
setup provisions the toolchain, make builds rsync, rsh, and the APK.

1 files changed, 413 insertions, 0 deletions

diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000..d58f907
--- /dev/null
+++ b/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,413 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/appRoot"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <include layout="@layout/app_toolbar" />
+
+    <ScrollView
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="@dimen/space_m">
+
+        <!-- Status hero -->
+        <LinearLayout
+            style="@style/Widget.Rsend.Card"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="horizontal"
+                android:gravity="center_vertical">
+
+                <TextView
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:textAppearance="@style/TextAppearance.Rsend.SectionHeader"
+                    android:text="Status" />
+
+                <TextView
+                    android:id="@+id/appVersion"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:textAppearance="@style/TextAppearance.Rsend.Caption" />
+            </LinearLayout>
+
+            <TextView
+                android:id="@+id/lastSync"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="@dimen/space_s"
+                android:textAppearance="@style/TextAppearance.Rsend.Title"
+                android:textIsSelectable="true"
+                android:text="Last sync: never" />
+        </LinearLayout>
+
+        <!-- Primary action -->
+        <Button
+            android:id="@+id/btnSync"
+            style="@style/Widget.Rsend.Button.Primary"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="@dimen/space_m"
+            android:text="Sync now" />
+
+        <ProgressBar
+            android:id="@+id/syncBar"
+            style="?android:attr/progressBarStyleHorizontal"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:indeterminate="true"
+            android:visibility="gone" />
+
+        <TextView
+            android:id="@+id/syncStatus"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="@dimen/space_m"
+            android:textAppearance="@style/TextAppearance.Rsend.Caption"
+            android:visibility="gone" />
+
+        <!-- Setup -->
+        <LinearLayout
+            style="@style/Widget.Rsend.Card"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="@dimen/space_s"
+                android:textAppearance="@style/TextAppearance.Rsend.SectionHeader"
+                android:text="Setup" />
+
+            <LinearLayout
+                android:id="@+id/rowRemote"
+                style="@style/Widget.Rsend.Row"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content">
+
+                <ImageView
+                    android:layout_width="24dp"
+                    android:layout_height="24dp"
+                    android:layout_marginEnd="@dimen/space_m"
+                    android:src="@drawable/ic_remote"
+                    android:contentDescription="@null" />
+
+                <LinearLayout
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:orientation="vertical">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Body"
+                        android:text="Remote" />
+
+                    <TextView
+                        android:id="@+id/remoteValue"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Caption" />
+                </LinearLayout>
+
+                <ImageView
+                    android:layout_width="20dp"
+                    android:layout_height="20dp"
+                    android:src="@drawable/ic_chevron"
+                    android:contentDescription="@null" />
+            </LinearLayout>
+
+            <View
+                android:layout_width="match_parent"
+                android:layout_height="@dimen/stroke"
+                android:layout_marginStart="40dp"
+                android:background="@color/outline" />
+
+            <LinearLayout
+                android:id="@+id/rowKey"
+                style="@style/Widget.Rsend.Row"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content">
+
+                <ImageView
+                    android:layout_width="24dp"
+                    android:layout_height="24dp"
+                    android:layout_marginEnd="@dimen/space_m"
+                    android:src="@drawable/ic_key"
+                    android:contentDescription="@null" />
+
+                <LinearLayout
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:orientation="vertical">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Body"
+                        android:text="Identity key" />
+
+                    <TextView
+                        android:id="@+id/keyValue"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Caption" />
+                </LinearLayout>
+
+                <ImageView
+                    android:layout_width="20dp"
+                    android:layout_height="20dp"
+                    android:src="@drawable/ic_chevron"
+                    android:contentDescription="@null" />
+            </LinearLayout>
+
+            <View
+                android:layout_width="match_parent"
+                android:layout_height="@dimen/stroke"
+                android:layout_marginStart="40dp"
+                android:background="@color/outline" />
+
+            <LinearLayout
+                android:id="@+id/rowSchedule"
+                style="@style/Widget.Rsend.Row"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content">
+
+                <ImageView
+                    android:layout_width="24dp"
+                    android:layout_height="24dp"
+                    android:layout_marginEnd="@dimen/space_m"
+                    android:src="@drawable/ic_schedule"
+                    android:contentDescription="@null" />
+
+                <LinearLayout
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:orientation="vertical">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Body"
+                        android:text="Schedule" />
+
+                    <TextView
+                        android:id="@+id/scheduleValue"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Caption" />
+                </LinearLayout>
+
+                <ImageView
+                    android:layout_width="20dp"
+                    android:layout_height="20dp"
+                    android:src="@drawable/ic_chevron"
+                    android:contentDescription="@null" />
+            </LinearLayout>
+        </LinearLayout>
+
+        <!-- Permissions -->
+        <LinearLayout
+            style="@style/Widget.Rsend.Card"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="@dimen/space_s"
+                android:textAppearance="@style/TextAppearance.Rsend.SectionHeader"
+                android:text="Permissions" />
+
+            <LinearLayout
+                android:id="@+id/rowAllFiles"
+                style="@style/Widget.Rsend.Row"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content">
+
+                <View
+                    android:id="@+id/dotAllFiles"
+                    android:layout_width="10dp"
+                    android:layout_height="10dp"
+                    android:layout_marginStart="7dp"
+                    android:layout_marginEnd="@dimen/space_l"
+                    android:background="@drawable/dot_off" />
+
+                <LinearLayout
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:orientation="vertical">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Body"
+                        android:text="All-files access" />
+
+                    <TextView
+                        android:id="@+id/valAllFiles"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Caption" />
+                </LinearLayout>
+
+                <ImageView
+                    android:layout_width="20dp"
+                    android:layout_height="20dp"
+                    android:src="@drawable/ic_chevron"
+                    android:contentDescription="@null" />
+            </LinearLayout>
+
+            <View
+                android:layout_width="match_parent"
+                android:layout_height="@dimen/stroke"
+                android:layout_marginStart="40dp"
+                android:background="@color/outline" />
+
+            <LinearLayout
+                android:id="@+id/rowNotif"
+                style="@style/Widget.Rsend.Row"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content">
+
+                <View
+                    android:id="@+id/dotNotif"
+                    android:layout_width="10dp"
+                    android:layout_height="10dp"
+                    android:layout_marginStart="7dp"
+                    android:layout_marginEnd="@dimen/space_l"
+                    android:background="@drawable/dot_off" />
+
+                <LinearLayout
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:orientation="vertical">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Body"
+                        android:text="Notifications" />
+
+                    <TextView
+                        android:id="@+id/valNotif"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Caption" />
+                </LinearLayout>
+
+                <ImageView
+                    android:layout_width="20dp"
+                    android:layout_height="20dp"
+                    android:src="@drawable/ic_chevron"
+                    android:contentDescription="@null" />
+            </LinearLayout>
+
+            <View
+                android:layout_width="match_parent"
+                android:layout_height="@dimen/stroke"
+                android:layout_marginStart="40dp"
+                android:background="@color/outline" />
+
+            <LinearLayout
+                android:id="@+id/rowBattery"
+                style="@style/Widget.Rsend.Row"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content">
+
+                <View
+                    android:id="@+id/dotBattery"
+                    android:layout_width="10dp"
+                    android:layout_height="10dp"
+                    android:layout_marginStart="7dp"
+                    android:layout_marginEnd="@dimen/space_l"
+                    android:background="@drawable/dot_off" />
+
+                <LinearLayout
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:orientation="vertical">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Body"
+                        android:text="Battery" />
+
+                    <TextView
+                        android:id="@+id/valBattery"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Rsend.Caption" />
+                </LinearLayout>
+
+                <ImageView
+                    android:layout_width="20dp"
+                    android:layout_height="20dp"
+                    android:src="@drawable/ic_chevron"
+                    android:contentDescription="@null" />
+            </LinearLayout>
+        </LinearLayout>
+
+        <!-- Folders -->
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="@dimen/space_s"
+            android:layout_marginBottom="@dimen/space_s"
+            android:textAppearance="@style/TextAppearance.Rsend.SectionHeader"
+            android:text="Folders" />
+
+        <LinearLayout
+            android:id="@+id/folders"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal">
+
+            <Button
+                android:id="@+id/btnAddFolder"
+                style="@style/Widget.Rsend.Button.Secondary"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginEnd="@dimen/space_s"
+                android:text="+ Add folder" />
+
+            <Button
+                android:id="@+id/btnLog"
+                style="@style/Widget.Rsend.Button.Secondary"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="View log" />
+        </LinearLayout>
+    </LinearLayout>
+    </ScrollView>
+</LinearLayout>