From 0a14ad63deb15f08f5186d0c2cd063e749722e4a Mon Sep 17 00:00:00 2001
From: Jussi Pakkanen <jpakkane@gmail.com>
Date: Wed, 28 Dec 2016 23:16:19 +0200
Subject: [PATCH] Add simple uninstall target. Closes #753.

---
 mesonbuild/backend/ninjabackend.py |  6 ++++
 mesonbuild/coredata.py             |  1 +
 mesonbuild/mesonmain.py            |  3 ++
 mesonbuild/scripts/uninstall.py    | 46 ++++++++++++++++++++++++++++++
 run_unittests.py                   | 13 +++++++++
 5 files changed, 69 insertions(+)
 create mode 100644 mesonbuild/scripts/uninstall.py

diff --git a/mesonbuild/backend/ninjabackend.py b/mesonbuild/backend/ninjabackend.py
index b43977ea1..2f81c3d96 100644
--- a/mesonbuild/backend/ninjabackend.py
+++ b/mesonbuild/backend/ninjabackend.py
@@ -2141,6 +2141,12 @@ rule FORTRAN_DEP_HACK
         elem.add_item('COMMAND', cmd)
         elem.add_item('pool', 'console')
         elem.write(outfile)
+        cmd = [sys.executable, self.environment.get_build_command(),
+               '--internal', 'uninstall']
+        elem = NinjaBuildElement(self.all_outputs, 'uninstall', 'CUSTOM_COMMAND', 'PHONY')
+        elem.add_item('COMMAND', cmd)
+        elem.add_item('pool', 'console')
+        elem.write(outfile)
 
     def generate_ending(self, outfile):
         targetlist = []
diff --git a/mesonbuild/coredata.py b/mesonbuild/coredata.py
index 4b0d0c472..8d63a229c 100644
--- a/mesonbuild/coredata.py
+++ b/mesonbuild/coredata.py
@@ -249,6 +249,7 @@ forbidden_target_names = {'clean': None,
                           'test:': None,
                           'benchmark': None,
                           'install': None,
+                          'uninstall': None,
                           'build.ninja': None,
                           'scan-build': None,
                           'reconfigure': None,
diff --git a/mesonbuild/mesonmain.py b/mesonbuild/mesonmain.py
index e85ef172d..98d072b02 100644
--- a/mesonbuild/mesonmain.py
+++ b/mesonbuild/mesonmain.py
@@ -237,6 +237,9 @@ def run_script_command(args):
     elif cmdname == 'yelphelper':
         import mesonbuild.scripts.yelphelper as abc
         cmdfunc = abc.run
+    elif cmdname == 'uninstall':
+        import mesonbuild.scripts.uninstall as abc
+        cmdfunc = abc.run
     else:
         raise MesonException('Unknown internal command {}.'.format(cmdname))
     return cmdfunc(cmdargs)
diff --git a/mesonbuild/scripts/uninstall.py b/mesonbuild/scripts/uninstall.py
new file mode 100644
index 000000000..85c4bbad8
--- /dev/null
+++ b/mesonbuild/scripts/uninstall.py
@@ -0,0 +1,46 @@
+# Copyright 2016 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+
+logfile = 'meson-logs/install-log.txt'
+
+def do_uninstall(log):
+    failures = 0
+    successes = 0
+    for line in open(log):
+        if line.startswith('#'):
+            continue
+        fname = line.strip()
+        try:
+            os.unlink(fname)
+            print('Deleted:', fname)
+            successes += 1
+        except Exception as e:
+            print('Could not delete %s: %s.' % (fname, e))
+            failures += 1
+    print('\nUninstall finished.\n')
+    print('Deleted:', successes)
+    print('Failed:', failures)
+    print('\nRemember that files created by custom scripts have not been removed.')
+
+def run(args):
+    if len(args) != 0:
+        print('Weird error.')
+        return 1
+    if not os.path.exists(logfile):
+        print('Log file does not exist, no installation has been done.')
+        return 0
+    do_uninstall(logfile)
+    return 0
diff --git a/run_unittests.py b/run_unittests.py
index 3d5a237ea..8f1f1554e 100755
--- a/run_unittests.py
+++ b/run_unittests.py
@@ -92,6 +92,9 @@ class LinuxlikeTests(unittest.TestCase):
         os.environ['DESTDIR'] = self.installdir
         self._run(self.ninja_command + ['install'])
 
+    def uninstall(self):
+        self._run(self.ninja_command + ['uninstall'])
+
     def run_target(self, target):
         self.output += subprocess.check_output(self.ninja_command + [target])
 
@@ -361,6 +364,16 @@ class LinuxlikeTests(unittest.TestCase):
             Oargs = [arg for arg in cmd if arg.startswith('-O')]
             self.assertEqual(Oargs, [Oflag, '-O0'])
 
+    def test_uninstall(self):
+        exename = os.path.join(self.installdir, 'usr/bin/prog')
+        testdir = os.path.join(self.common_test_dir, '8 install')
+        self.init(testdir)
+        self.assertFalse(os.path.exists(exename))
+        self.install()
+        self.assertTrue(os.path.exists(exename))
+        self.uninstall()
+        self.assertFalse(os.path.exists(exename))
+
 class RewriterTests(unittest.TestCase):
 
     def setUp(self):