Linux can’t find file that exists

64-bitarch-linux

I'm trying to get Google's Dart language up and running, but it errors when running dart2js. I'm running Arch linux and I installed dart-sdk from AUR. Some relevant terminal output lies below.

% dart2js main.dart   
/usr/local/bin/dart2js: line 7: /usr/local/bin/dart: No such file or directory

% cat /usr/local/bin/dart2js
#!/bin/sh
# Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
# for details. All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.

BIN_DIR=`dirname $0`
exec $BIN_DIR/dart --allow_string_plus=false $BIN_DIR/../lib/dart2js/lib/compiler/implementation/dart2js.dart "$@"

% file /usr/local/bin/dart                                                                                          
/usr/local/bin/dart: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), 
dynamically linked (uses shared libs), for GNU/Linux 2.6.15,
BuildID[sha1]=0x27fe166ca015c1adfeaf3a6f9c018e7d7af46d9f, stripped

% ls -alh /usr/local/bin
total 4.9M
drwxr-xr-x  2 root root 4.0K Jun 10 22:51 .
drwxr-xr-x 12 root root 4.0K Jun 10 22:51 ..
-rwxr-xr-x  1 root root 422K May 10 22:41 cargo
-rwxr-xr-x  1 root root 2.7M Jun 10 22:50 dart
-rwxr-xr-x  1 root root  360 Jun  6 16:20 dart2js
-rwxr-xr-x  1 root root  176 Jun  6 16:20 pub
-rwxr-xr-x  1 root root 166K May 10 22:41 rustc
-rwxr-xr-x  1 root root 1.6M May 10 22:41 rustdoc

% uname -rm
3.3.7-1-ARCH x86_64

Could it be because I'm running a 64bit OS and the dart binary is 32bit?

Best Answer

In order to execute an ELF binary linux needs to start a program that decodes ELF, loads dynamic libraries, etc. This program is called program interpreter. The name and full path to the program interpreter is written in the ELF itself

For instance 

 $ file /usr/bin/cheese 
 /usr/bin/cheese: ELF 32-bit LSB executable, Intel 80386

 $ readelf -l /usr/bin/cheese  
 Elf file type is EXEC (Executable file)
 ...
 Program Headers:
 ...
 INTERP         0x000154 0x08048154 0x08048154 0x00013 0x00013 R   0x1
  [Requesting program interpreter: /lib/ld-linux.so.2]
 ...

If the program interpreter requested by the ELF is not found BASH gets the file not found error and reports "No such file or directory".

As @poige said above, you need to install basic support for running 32-bit applications.

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