From e21f0a3accb8a27582e59567cdd54123b45e4f41 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 1 Feb 2017 19:34:44 +0530
Subject: [PATCH] Dont error if file exists when building installer

---
 setup/installers.py | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/setup/installers.py b/setup/installers.py
index e47184229a..e425a23c86 100644
--- a/setup/installers.py
+++ b/setup/installers.py
@@ -2,8 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import (unicode_literals, division, absolute_import,
-                        print_function)
+from __future__ import (unicode_literals, division, absolute_import, print_function)
 import os, sys, subprocess
 
 from setup import Command
@@ -15,7 +14,9 @@ def build_single(which, bitness, shutdown=True):
     build_calibre = os.path.join(d(base), 'build-calibre')
     build_calibre = os.environ.get('BUILD_CALIBRE_LOCATION', build_calibre)
     if not os.path.isdir(build_calibre):
-        raise SystemExit('Cannot find the build-calibre code. Set the environment variable BUILD_CALIBRE_LOCATION to point to it')
+        raise SystemExit(
+            'Cannot find the build-calibre code. Set the environment variable BUILD_CALIBRE_LOCATION to point to it'
+        )
     cmd = [sys.executable, os.path.join(build_calibre, which)]
     if bitness:
         cmd.append(bitness)
@@ -32,7 +33,12 @@ def build_single(which, bitness, shutdown=True):
     dist = os.path.join(dist, 'dist')
     for x in os.listdir(dist):
         print(x)
-        os.link(os.path.join(dist, x), os.path.join(base, 'dist', x))
+        dest = os.path.join(base, 'dist', x)
+        try:
+            os.remove(dest)
+        except EnvironmentError:
+            pass
+        os.link(os.path.join(dist, x), dest)
     if shutdown and which != 'linux':
         cmd = [sys.executable, os.path.join(build_calibre, which), 'shutdown']
         subprocess.Popen(cmd, env=env, cwd=build_calibre).wait()
@@ -43,8 +49,12 @@ class BuildInstaller(Command):
     OS = BITNESS = ''
 
     def add_options(self, parser):
-        parser.add_option('--dont-shutdown', default=False, action='store_true',
-                          help='Do not shutdown the VM after building')
+        parser.add_option(
+            '--dont-shutdown',
+            default=False,
+            action='store_true',
+            help='Do not shutdown the VM after building'
+        )
 
     def run(self, opts):
         build_single(self.OS, self.BITNESS, not opts.dont_shutdown)
@@ -60,31 +70,38 @@ class BuildInstallers(BuildInstaller):
             shutdown = bitness is bits[-1] and not opts.dont_shutdown
             build_single(self.OS, bitness, shutdown)
 
+
 class Linux32(BuildInstaller):
     OS = 'linux'
     BITNESS = '32'
     description = 'Build the 32-bit linux calibre installer'
 
+
 class Linux64(BuildInstaller):
     OS = 'linux'
     BITNESS = '64'
     description = 'Build the 64-bit linux calibre installer'
 
+
 class Win32(BuildInstaller):
     OS = 'win'
     BITNESS = '32'
     description = 'Build the 32-bit windows calibre installers'
 
+
 class Win64(BuildInstaller):
     OS = 'win'
     BITNESS = '64'
     description = 'Build the 64-bit windows calibre installer'
 
+
 class OSX(BuildInstaller):
     OS = 'osx'
 
+
 class Linux(BuildInstallers):
     OS = 'linux'
 
+
 class Win(BuildInstallers):
     OS = 'win'