Clean up the server from temporary folder

The server is copied to /data/local/tmp/scrcpy-server.jar and executed
on the device.

As soon as we are connected, we can unlink (rm) it from /data/local/tmp,
to keep the device clean.

app/src/command.c

@@ -66,6 +66,11 @@ process_t adb_push(const char *serial, const char *local, const char *remote) {
     return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 }
 
+process_t adb_remove_path(const char *serial, const char *path) {
+    const char *const adb_cmd[] = {"shell", "rm", path};
+    return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
+}
+
 SDL_bool process_check_success(process_t proc, const char *name) {
     if (proc == PROCESS_NONE) {
         LOGE("Could not execute \"%s\"", name);

app/src/command.h

@@ -42,6 +42,7 @@ process_t adb_forward(const char *serial, uint16_t local_port, const char *devic
 process_t adb_reverse(const char *serial, const char *device_socket_name, uint16_t local_port);
 process_t adb_reverse_remove(const char *serial, const char *device_socket_name);
 process_t adb_push(const char *serial, const char *local, const char *remote);
+process_t adb_remove_path(const char *serial, const char *path);
 
 // convenience function to wait for a successful process execution
 // automatically log process errors with the provided process name

app/src/server.c

@@ -17,6 +17,8 @@
 # define DEFAULT_SERVER_PATH PREFIX PREFIXED_SERVER_PATH
 #endif
 
+#define DEVICE_SERVER_PATH "/data/local/tmp/scrcpy-server.jar"
+
 static const char *get_server_path(void) {
     const char *server_path = getenv("SCRCPY_SERVER_PATH");
     if (!server_path) {
@@ -26,10 +28,15 @@ static const char *get_server_path(void) {
 }
 
 static SDL_bool push_server(const char *serial) {
-    process_t process = adb_push(serial, get_server_path(), "/data/local/tmp/scrcpy-server.jar");
+    process_t process = adb_push(serial, get_server_path(), DEVICE_SERVER_PATH);
     return process_check_success(process, "adb push");
 }
 
+static SDL_bool remove_server(const char *serial) {
+    process_t process = adb_remove_path(serial, DEVICE_SERVER_PATH);
+    return process_check_success(process, "adb shell rm");
+}
+
 static SDL_bool enable_tunnel(const char *serial, Uint16 local_port) {
     process_t process = adb_reverse(serial, SOCKET_NAME, local_port);
     return process_check_success(process, "adb reverse");
@@ -81,6 +88,8 @@ SDL_bool server_start(struct server *server, const char *serial, Uint16 local_po
         return SDL_FALSE;
     }
 
+    server->server_copied_to_device = SDL_TRUE;
+
     if (!enable_tunnel(serial, local_port)) {
         return SDL_FALSE;
     }
@@ -120,6 +129,10 @@ socket_t server_connect_to(struct server *server, const char *serial, Uint32 tim
     // we don't need the server socket anymore
     close_socket(&server->server_socket);
 
+    // the server is started, we can clean up the jar from the temporary folder
+    remove_server(serial); // ignore failure
+    server->server_copied_to_device = SDL_FALSE;
+
     // we don't need the adb tunnel anymore
     disable_tunnel(serial); // ignore failure
     server->adb_reverse_enabled = SDL_FALSE;
@@ -145,6 +158,10 @@ void server_stop(struct server *server, const char *serial) {
         // ignore failure
         disable_tunnel(serial);
     }
+
+    if (server->server_copied_to_device) {
+        remove_server(serial); // ignore failure
+    }
 }
 
 void server_destroy(struct server *server) {

app/src/server.h

@@ -9,6 +9,7 @@ struct server {
     socket_t server_socket;
     socket_t device_socket;
     SDL_bool adb_reverse_enabled;
+    SDL_bool server_copied_to_device;
 };
 
 #define SERVER_INITIALIZER {              \
@@ -16,6 +17,7 @@ struct server {
     .server_socket = INVALID_SOCKET,      \
     .device_socket = INVALID_SOCKET,      \
     .adb_reverse_enabled = SDL_FALSE,     \
+    .server_copied_to_device = SDL_FALSE, \
 }
 
 // init default values