dist/debian: fix renaming debian/scylla-* files rule

Current renaming rule of debian/scylla-* files is buggy, it fails to
install some .service files when custom product name specified.

Introduce regex based rewriting instead of adhoc renaming, and fixed
wrong renaming rule.

This is not needed for scylla-python3 since it doesn't use systemd unit,
but better to sync same code with scylla main repo.

Closes #18

Author: syuu1228

dist/debian/debian_files_gen.py

@@ -23,8 +23,9 @@
 
 import string
 import os
-import glob
 import shutil
+import re
+from pathlib import Path
 
 class DebianFilesTemplate(string.Template):
     delimiter = '%'
@@ -46,12 +47,25 @@ class DebianFilesTemplate(string.Template):
 with open('build/SCYLLA-RELEASE-FILE') as f:
     release = f.read().strip()
 
-shutil.rmtree('build/debian/debian', ignore_errors=True)
+if os.path.exists('build/debian/debian'):
+    shutil.rmtree('build/debian/debian')
 shutil.copytree('dist/debian/debian', 'build/debian/debian')
 
 if product != 'scylla':
-    for p in glob.glob('build/debian/debian/scylla-*'):
-        shutil.move(p, p.replace('scylla-', '{}-'.format(product)))
+    for p in Path('build/debian/debian').glob('scylla-*'):
+        # pat1: scylla-server.service
+        #    -> scylla-enterprise-server.scylla-server.service
+        # pat2: scylla-server.scylla-fstrim.service
+        #    -> scylla-enterprise-server.scylla-fstrim.service
+        # pat3: scylla-conf.install
+        #    -> scylla-enterprise-conf.install
+
+        if m := re.match(r'^scylla(-[^.]+)\.service$', p.name):
+            p.rename(p.parent / f'{product}{m.group(1)}.{p.name}')
+        elif m := re.match(r'^scylla(-[^.]+\.scylla-[^.]+\.[^.]+)$', p.name):
+            p.rename(p.parent / f'{product}{m.group(1)}')
+        else:
+            p.rename(p.parent / p.name.replace('scylla', product, 1))
 
 s = DebianFilesTemplate(changelog_template)
 changelog_applied = s.substitute(product=product, version=version, release=release, revision='1', codename='stable')