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From c59c376b2623330a70ab692844ca00eb58f67576 Mon Sep 17 00:00:00 2001
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From: Martin Pitt <martin.pitt@ubuntu.com>
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Date: Thu, 19 Feb 2015 11:06:24 +0100
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Subject: [PATCH] sysv-generator: fix wrong "Overwriting existing symlink"
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 warnings
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Fix result testing of is_symlink() to ignore negative results, which happen if
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the file name does not exist at all. In this case we do not want a warning and
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unlink the non-existing link.
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https://bugs.debian.org/778700
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(cherry picked from commit 4e5589836c9e143796c3f3d81e67ab7a9209e2b0)
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Apparently this was missed for some reason and did not end up in
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stable previously.
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Cherry-picked from: 4e55898
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Resolves: #1222517
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---
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 src/sysv-generator/sysv-generator.c | 2 +-
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 test/sysv-generator-test.py         | 7 +++++++
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 2 files changed, 8 insertions(+), 1 deletion(-)
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diff --git a/src/sysv-generator/sysv-generator.c b/src/sysv-generator/sysv-generator.c
Pablo Greco 48fc63
index cfc4a99e4a..3c6cb8f10e 100644
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--- a/src/sysv-generator/sysv-generator.c
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+++ b/src/sysv-generator/sysv-generator.c
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@@ -166,7 +166,7 @@ static int generate_unit_file(SysvStub *s) {
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         /* We might already have a symlink with the same name from a Provides:,
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          * or from backup files like /etc/init.d/foo.bak. Real scripts always win,
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          * so remove an existing link */
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-        if (is_symlink(unit)) {
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+        if (is_symlink(unit) > 0) {
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                 log_warning("Overwriting existing symlink %s with real service", unit);
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                 (void) unlink(unit);
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         }
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diff --git a/test/sysv-generator-test.py b/test/sysv-generator-test.py
Pablo Greco 48fc63
index 509899e0a5..e716d705c0 100644
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--- a/test/sysv-generator-test.py
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+++ b/test/sysv-generator-test.py
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@@ -178,6 +178,8 @@ class SysvGeneratorTest(unittest.TestCase):
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         self.assertEqual(s.get('Service', 'ExecStop'),
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                          '%s stop' % init_script)
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+        self.assertNotIn('Overwriting', err)
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+
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     def test_simple_enabled_all(self):
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         '''simple service without dependencies, enabled in all runlevels'''
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@@ -185,6 +187,7 @@ class SysvGeneratorTest(unittest.TestCase):
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         err, results = self.run_generator()
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         self.assertEqual(list(results), ['foo.service'])
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         self.assert_enabled('foo.service', [2, 3, 4, 5])
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+        self.assertNotIn('Overwriting', err)
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     def test_simple_enabled_some(self):
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         '''simple service without dependencies, enabled in some runlevels'''
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@@ -270,6 +273,7 @@ class SysvGeneratorTest(unittest.TestCase):
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         for f in ['bar.service', 'baz.service']:
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             self.assertEqual(os.readlink(os.path.join(self.out_dir, f)),
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                              'foo.service')
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+        self.assertNotIn('Overwriting', err)
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     def test_same_provides_in_multiple_scripts(self):
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         '''multiple init.d scripts provide the same name'''
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@@ -289,6 +293,9 @@ class SysvGeneratorTest(unittest.TestCase):
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         self.add_sysv('bar', {'Provides': 'bar'}, enable=True)
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         err, results = self.run_generator()
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         self.assertEqual(sorted(results), ['bar.service', 'foo.service'])
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+        # we do expect an overwrite here, bar.service should overwrite the
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+        # alias link from foo.service
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+        self.assertIn('Overwriting', err)
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     def test_nonexecutable_script(self):
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         '''ignores non-executable init.d script'''