Merge ~przemeklal/charm-juju-lint:fix-lp-1970753 into charm-juju-lint:master

[Przemyslaw Lal]

Rewrite auto_lint.py when creating it from the template

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PASSED: Continuous integration, rev:8f8ec04a80aa40f07e33755d03b3d529e7c6e81e
https://jenkins.canonical.com/bootstack/job/lp-charm-juju-lint-ci/16/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/bootstack/job/lp-charm-test-functest/760/
    None: https://jenkins.canonical.com/bootstack/job/lp-update-mp/1233/

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review: Approve (continuous-integration)

[Xav Paice (xavpaice)]

lgtm, possible docs error in https://docs.python.org/3/library/functions.html#open

review: Approve

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change successfully merged at revision 0197b12c0fe42ffe2efd6b50e6f683214d0b0d05

diff --git a/lib/lib_jujulint.py b/lib/lib_jujulint.py
index 872507b..0085aee 100644
--- a/lib/lib_jujulint.py
+++ b/lib/lib_jujulint.py
@@ -92,11 +92,11 @@ class JujuLintHelper:
             "REPLACE_CHARMDIR", str(charm_dir)
         )
 
-        fd = os.open(str(Paths.AUTO_LINT_SCRIPT_PATH), os.O_CREAT | os.O_WRONLY, 0o755)
-
-        with open(fd, "w") as f:
+        with open(str(Paths.AUTO_LINT_SCRIPT_PATH), "w+") as f:
             f.write(auto_lint_script)
 
+        os.chmod(str(Paths.AUTO_LINT_SCRIPT_PATH), 0o755)
+
         # install all files in scripts/plugins/ into nagios plugins dir
         plugins_dir = scripts_dir / "plugins"
         # Note that we need to add 'options' here to remove the flag '--delete' that