adb: report error in copy_to_file.

Previously, if we failed to read a file after successfully opening it,
(e.g. because it's a directory), we would return prematurely without
notifying our caller, which would then wait forever for a response that
isn't coming.

Switch all of the adb install callsites over to checking the result,
but leave the other callsites ignoring the result, because they're
either deprecated, or don't care.

Bug: http://b/145621968
Test: mkdir foo.apk; adb install foo.apk
Change-Id: Ia82f8280b144f7881e067a10cd17f9a89019cf3f
diff --git a/adb/client/adb_install.cpp b/adb/client/adb_install.cpp
index 73dcde1..2bcd0a6 100644
--- a/adb/client/adb_install.cpp
+++ b/adb/client/adb_install.cpp
@@ -227,16 +227,20 @@
         return 1;
     }
 
-    copy_to_file(local_fd.get(), remote_fd.get());
+    if (!copy_to_file(local_fd.get(), remote_fd.get())) {
+        fprintf(stderr, "adb: failed to install: copy_to_file: %s: %s", file, strerror(errno));
+        return 1;
+    }
 
     char buf[BUFSIZ];
     read_status_line(remote_fd.get(), buf, sizeof(buf));
-    if (!strncmp("Success", buf, 7)) {
-        fputs(buf, stdout);
-        return 0;
+    if (strncmp("Success", buf, 7) != 0) {
+        fprintf(stderr, "adb: failed to install %s: %s", file, buf);
+        return 1;
     }
-    fprintf(stderr, "adb: failed to install %s: %s", file, buf);
-    return 1;
+
+    fputs(buf, stdout);
+    return 0;
 }
 
 static int install_app_legacy(int argc, const char** argv, bool use_fastdeploy) {
@@ -455,7 +459,12 @@
             goto finalize_session;
         }
 
-        copy_to_file(local_fd.get(), remote_fd.get());
+        if (!copy_to_file(local_fd.get(), remote_fd.get())) {
+            fprintf(stderr, "adb: failed to write \"%s\": %s\n", file, strerror(errno));
+            success = false;
+            goto finalize_session;
+        }
+
         read_status_line(remote_fd.get(), buf, sizeof(buf));
 
         if (strncmp("Success", buf, 7)) {
@@ -634,7 +643,11 @@
                 goto finalize_multi_package_session;
             }
 
-            copy_to_file(local_fd.get(), remote_fd.get());
+            if (!copy_to_file(local_fd.get(), remote_fd.get())) {
+                fprintf(stderr, "adb: failed to write %s: %s\n", split.c_str(), strerror(errno));
+                goto finalize_multi_package_session;
+            }
+
             read_status_line(remote_fd.get(), buf, sizeof(buf));
 
             if (strncmp("Success", buf, 7)) {
diff --git a/adb/client/commandline.cpp b/adb/client/commandline.cpp
index a6d7e31..c302965 100644
--- a/adb/client/commandline.cpp
+++ b/adb/client/commandline.cpp
@@ -352,7 +352,8 @@
 #endif
 }
 
-void copy_to_file(int inFd, int outFd) {
+bool copy_to_file(int inFd, int outFd) {
+    bool result = true;
     std::vector<char> buf(64 * 1024);
     int len;
     long total = 0;
@@ -375,6 +376,7 @@
         }
         if (len < 0) {
             D("copy_to_file(): read failed: %s", strerror(errno));
+            result = false;
             break;
         }
         if (outFd == STDOUT_FILENO) {
@@ -388,7 +390,8 @@
 
     stdinout_raw_epilogue(inFd, outFd, old_stdin_mode, old_stdout_mode);
 
-    D("copy_to_file() finished after %lu bytes", total);
+    D("copy_to_file() finished with %s after %lu bytes", result ? "success" : "failure", total);
+    return result;
 }
 
 static void send_window_size_change(int fd, std::unique_ptr<ShellProtocol>& shell) {
diff --git a/adb/client/commandline.h b/adb/client/commandline.h
index ab77b29..b9dee56 100644
--- a/adb/client/commandline.h
+++ b/adb/client/commandline.h
@@ -100,7 +100,7 @@
 
 int adb_commandline(int argc, const char** argv);
 
-void copy_to_file(int inFd, int outFd);
+bool copy_to_file(int inFd, int outFd);
 
 // Connects to the device "shell" service with |command| and prints the
 // resulting output.