Adding sort.py to GitLab CI (#2973)

* Add contrib/sort.py to Gitlab CI

Not adding to Debian Jessie or CentOS since python >=3.6 is not
available

See https://github.com/netblue30/firejail/pull/2870

* Updates

Explicitly install python3 on Ubuntu (should be pre-installed but not
working as-is)

Remove running python3 code on CentOS

* ci: comment out contrib/sort.py for Alpine

Getting this error:
$ python3 contrib/sort.py etc/*.{profile,inc}
[ Error ] Can't find `etc/*.{profile,inc}'
ERROR: Job failed: exit code 1

For now it's better to debug later and enable this test for the other
jobs

.gitlab-ci.yml

@@ -9,8 +9,9 @@ build_ubuntu_package:
     image: ubuntu:rolling
     script:
         - apt-get update -qq
-        - apt-get install -y -qq build-essential lintian pkg-config
+        - apt-get install -y -qq build-essential lintian pkg-config python3
         - ./configure --prefix=/usr && make deb && dpkg -i firejail*.deb
+        - python3 contrib/sort.py etc/*.{profile,inc}
 
 build_debian_package:
     image: debian:jessie
@@ -32,14 +33,16 @@ build_fedora_package:
         - dnf update -y
         - dnf install -y rpm-build gcc make
         - ./configure --prefix=/usr && make rpms && rpm -i firejail*.rpm
+        - python3 contrib/sort.py etc/*.{profile,inc}
 
 build_src_package:
     image: alpine:latest
     script:
         - apk update
         - apk upgrade
-        - apk add build-base linux-headers
+        - apk add build-base linux-headers python3
         - ./configure --prefix=/usr && make && make install-strip
+        # - python3 contrib/sort.py etc/*.{profile,inc}
 
 build_apparmor:
     image: ubuntu:latest

contrib/sort.py

@@ -23,11 +23,13 @@ Exit-Codes:
 #  python >= 3.6
 from sys import argv
 
+
 def sort_alphabetical(raw_items):
     items = raw_items.split(",")
     items.sort(key=lambda s: s.casefold())
     return ",".join(items)
 
+
 def sort_protocol(protocols):
     """sort the given protocole into this scheme: unix,inet,inet6,netlink,packet"""
     # shortcut for common protocol lines
@@ -64,6 +66,7 @@ def sort_protocol(protocols):
         fixed_protocols += "packet,"
     return fixed_protocols[:-1]
 
+
 def fix_profile(filename):
     with open(filename, "r+") as profile:
         lines = profile.read().split("\n")
@@ -94,6 +97,7 @@ def fix_profile(filename):
             return 101
         return 0
 
+
 def main(args):
     exit_code = 0
     for filename in args:
@@ -103,15 +107,16 @@ def main(args):
             else:
                 fix_profile(filename)
         except FileNotFoundError:
-            print(f"[ Error ] Can't find {filename}")
+            print(f"[ Error ] Can't find `{filename}'")
             exit_code = 1
         except PermissionError:
-            print(f"[ Error ] Can't read/write {filename}")
+            print(f"[ Error ] Can't read/write `{filename}'")
             exit_code = 1
         except:
-            print(f"[ Error ] An error occurred while processing {filename}")
+            print(f"[ Error ] An error occurred while processing `{filename}'")
             exit_code = 1
     return exit_code
 
+
 if __name__ == "__main__":
     exit(main(argv[1:]))