Add option --install

When this flag is set, the scrcpy is installed rather than pushed to
/data/local/tmp.

app/scrcpy.1

@@ -110,6 +110,10 @@ However, the option is only available when the HID keyboard is enabled (or a phy
 
 Also see \fB\-\-hid\-mouse\fR.
 
+.TP
+.B \-\-install
+Install the server (via "adb install") rather than pushing it to /data/local/tmp (via "adb push").
+
 .TP
 .B \-\-legacy\-paste
 Inject computer clipboard text as a sequence of key events on Ctrl+v (like MOD+Shift+v).

app/src/cli.c

@@ -57,6 +57,7 @@
 #define OPT_NO_CLEANUP             1037
 #define OPT_PRINT_FPS              1038
 #define OPT_NO_POWER_ON            1039
+#define OPT_INSTALL                1040
 
 struct sc_option {
     char shortopt;
@@ -207,6 +208,12 @@ static const struct sc_option options[] = {
         .longopt = "help",
         .text = "Print this help.",
     },
+    {
+        .longopt_id = OPT_INSTALL,
+        .longopt = "install",
+        .text = "Install the server (via 'adb install') rather than pushing "
+                "it to /data/local/tmp (via 'adb push').",
+    },
     {
         .longopt_id = OPT_LEGACY_PASTE,
         .longopt = "legacy-paste",
@@ -1610,6 +1617,9 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
             case OPT_PRINT_FPS:
                 opts->start_fps_counter = true;
                 break;
+            case OPT_INSTALL:
+                opts->install = true;
+                break;
             case OPT_OTG:
 #ifdef HAVE_USB
                 opts->otg = true;

app/src/options.c

@@ -65,4 +65,5 @@ const struct scrcpy_options scrcpy_options_default = {
     .cleanup = true,
     .start_fps_counter = false,
     .power_on = true,
+    .install = false,
 };

app/src/options.h

@@ -140,6 +140,7 @@ struct scrcpy_options {
     bool cleanup;
     bool start_fps_counter;
     bool power_on;
+    bool install;
 };
 
 extern const struct scrcpy_options scrcpy_options_default;

app/src/scrcpy.c

@@ -325,6 +325,7 @@ scrcpy(struct scrcpy_options *options) {
         .tcpip_dst = options->tcpip_dst,
         .cleanup = options->cleanup,
         .power_on = options->power_on,
+        .install = options->install,
     };
 
     static const struct sc_server_callbacks cbs = {

app/src/server.c

@@ -15,6 +15,7 @@
 #include "util/str.h"
 
 #define SC_SERVER_FILENAME "scrcpy-server.apk"
+#define SC_SERVER_PACKAGE "com.genymobile.scrcpy"
 
 #define SC_SERVER_PATH_DEFAULT PREFIX "/share/scrcpy/" SC_SERVER_FILENAME
 #define SC_DEVICE_SERVER_PATH "/data/local/tmp/scrcpy-server.apk"
@@ -104,7 +105,7 @@ error:
 }
 
 static bool
-push_server(struct sc_intr *intr, const char *serial) {
+push_server(struct sc_intr *intr, const char *serial, bool install) {
     char *server_path = get_server_path();
     if (!server_path) {
         return false;
@@ -114,7 +115,28 @@ push_server(struct sc_intr *intr, const char *serial) {
         free(server_path);
         return false;
     }
-    bool ok = sc_adb_push(intr, serial, server_path, SC_DEVICE_SERVER_PATH, 0);
+    bool ok;
+
+    if (install) {
+        char *version = sc_adb_get_installed_apk_version(intr, serial, 0);
+        bool same_version = version && !strcmp(version, SCRCPY_VERSION);
+        free(version);
+        if (same_version) {
+            LOGI("Server " SCRCPY_VERSION " already installed");
+            ok = true;
+        } else {
+            LOGI("Installing server " SCRCPY_VERSION);
+            // If a server with a different signature is installed, or if a
+            // newer server is already installed, we must uninstall it first.
+            ok = sc_adb_uninstall(intr, serial, SC_SERVER_PACKAGE,
+                                  SC_ADB_SILENT);
+            (void) ok; // expected to fail if it is not installed
+            ok = sc_adb_install(intr, serial, server_path, 0);
+        }
+    } else {
+        ok = sc_adb_push(intr, serial, server_path, SC_DEVICE_SERVER_PATH, 0);
+    }
+
     free(server_path);
     return ok;
 }
@@ -152,6 +174,38 @@ sc_server_sleep(struct sc_server *server, sc_tick deadline) {
     return !stopped;
 }
 
+static char *
+get_classpath_cmd(struct sc_intr *intr, const char *serial, bool install) {
+    if (!install) {
+        // In push mode, the path is known statically
+        char *cp = strdup("CLASSPATH=" SC_DEVICE_SERVER_PATH);
+        if (!cp) {
+            LOG_OOM();
+        }
+        return cp;
+    }
+
+    char *apk_path = sc_adb_get_installed_apk_path(intr, serial, 0);
+    if (!apk_path) {
+        LOGE("Could not get device apk path");
+        return NULL;
+    }
+
+#define PREFIX_SIZE (sizeof("CLASSPATH=") - 1)
+    size_t len = strlen(apk_path);
+    char *cp = malloc(PREFIX_SIZE + len + 1);
+    if (!cp) {
+        LOG_OOM();
+        free(apk_path);
+        return NULL;
+    }
+
+    memcpy(cp, "CLASSPATH=", PREFIX_SIZE);
+    memcpy(cp + PREFIX_SIZE, apk_path, len + 1);
+    free(apk_path);
+    return cp;
+}
+
 static sc_pid
 execute_server(struct sc_server *server,
                const struct sc_server_params *params) {
@@ -160,13 +214,20 @@ execute_server(struct sc_server *server,
     const char *serial = server->serial;
     assert(serial);
 
+    char *classpath = get_classpath_cmd(&server->intr, serial, params->install);
+    if (!classpath) {
+        return SC_PROCESS_NONE;
+    }
+
+    LOGD("Using %s", classpath);
+
     const char *cmd[128];
     unsigned count = 0;
     cmd[count++] = sc_adb_get_executable();
     cmd[count++] = "-s";
     cmd[count++] = serial;
     cmd[count++] = "shell";
-    cmd[count++] = "CLASSPATH=" SC_DEVICE_SERVER_PATH;
+    cmd[count++] = classpath;
     cmd[count++] = "app_process";
 
 #ifdef SERVER_DEBUGGER
@@ -272,6 +333,8 @@ execute_server(struct sc_server *server,
     pid = sc_adb_execute(cmd, 0);
 
 end:
+    free(classpath);
+
     for (unsigned i = dyn_idx; i < count; ++i) {
         free((char *) cmd[i]);
     }
@@ -755,8 +818,9 @@ run_server(void *data) {
     assert(serial);
     LOGD("Device serial: %s", serial);
 
-    ok = push_server(&server->intr, serial);
+    ok = push_server(&server->intr, serial, params->install);
     if (!ok) {
+        LOGE("Failed to push server");
         goto error_connection_failed;
     }
 

app/src/server.h

@@ -48,6 +48,7 @@ struct sc_server_params {
     bool select_tcpip;
     bool cleanup;
     bool power_on;
+    bool install;
 };
 
 struct sc_server {