dist/debian: drop dependency on pystache

Drop dependency on pystache since it nolong present in Fedora 32.

To implement it, simplified debian package build process.
It will be generate debian/ directory when building relocatable package,
we just need to run debuild using the package.

To generate debian/ directory this commit added debian_files_gen.py,
it construct whole directory including control and changelog files
from template files.
Since we need to stop pystache, these template files swiched to
string.Template class which is included python3 standard library.

see: https://github.com/scylladb/scylla/pull/6313

dist/debian/build_deb.sh

@@ -58,10 +58,6 @@ if [ ! -f "$RELOC_PKG" ]; then
     exit 1
 fi
 
-if [ -e debian ] || [ -e build/release ]; then
-    sudo rm -rf debian build
-    mkdir build
-fi
 if is_debian_variant; then
     sudo apt-get -y update
 fi
@@ -85,13 +81,6 @@ fi
 if [ ! -f /usr/bin/fakeroot ]; then
     pkg_install fakeroot
 fi
-if [ ! -f /usr/bin/pystache ]; then
-    if is_redhat_variant; then
-        sudo yum install -y /usr/bin/pystache
-    elif is_debian_variant; then
-        sudo apt-get install -y python-pystache
-    fi
-fi
 
 if [ "$ID" = "ubuntu" ] && [ ! -f /usr/share/keyrings/debian-archive-keyring.gpg ]; then
     sudo apt-get install -y debian-archive-keyring
@@ -106,21 +95,4 @@ SCYLLA_VERSION=$(cat SCYLLA-VERSION-FILE | sed 's/\.rc/~rc/')
 SCYLLA_RELEASE=$(cat SCYLLA-RELEASE-FILE)
 
 ln -fv $RELOC_PKG_FULLPATH ../$PRODUCT-jmx_$SCYLLA_VERSION-$SCYLLA_RELEASE.orig.tar.gz
-
-cp -al dist/debian/debian debian
-if [ "$PRODUCT" != "scylla" ]; then
-    for i in debian/scylla-*;do
-        mv $i ${i/scylla-/$PRODUCT-}
-    done
-fi
-
-REVISION="1"
-MUSTACHE_DIST="\"debian\": true, \"$TARGET\": true, \"product\": \"$PRODUCT\", \"$PRODUCT\": true"
-pystache dist/debian/changelog.mustache "{ $MUSTACHE_DIST, \"version\": \"$SCYLLA_VERSION\", \"release\": \"$SCYLLA_RELEASE\", \"revision\": \"$REVISION\", \"codename\": \"$TARGET\" }" > debian/changelog
-pystache dist/debian/rules.mustache "{ $MUSTACHE_DIST }" > debian/rules
-chmod a+rx debian/rules
-pystache dist/debian/control.mustache "{ $MUSTACHE_DIST }" > debian/control
-
-cp dist/common/systemd/scylla-jmx.service debian/scylla-jmx.service
-
 debuild -rfakeroot -us -uc

dist/debian/changelog.template

@@ -1,4 +1,4 @@
-{{product}}-jmx ({{version}}-{{release}}-{{revision}}) {{codename}}; urgency=medium
+%{product}-jmx (%{version}-%{release}-%{revision}) %{codename}; urgency=medium
 
   * Initial release.
 

dist/debian/control.template

@@ -1,13 +1,13 @@
-Source: {{product}}-jmx
+Source: %{product}-jmx
 Maintainer: Takuya ASADA <syuu@scylladb.com>
 Homepage: http://scylladb.com
 Section: database
 Priority: optional
 Standards-Version: 3.9.5
 
-Package: {{product}}-jmx
+Package: %{product}-jmx
 Architecture: all
-Depends: ${shlibs:Depends}, ${misc:Depends}, openjdk-8-jre-headless | openjdk-8-jre | oracle-java8-set-default | adoptopenjdk-8-hotspot-jre, {{product}}-server
+Depends: ${shlibs:Depends}, ${misc:Depends}, openjdk-8-jre-headless | openjdk-8-jre | oracle-java8-set-default | adoptopenjdk-8-hotspot-jre, %{product}-server
 Conflicts: openjdk-11-jre-headless, openjdk-11-jre, oracle-java11-set-default
 Description: Scylla JMX server binaries 
  Scylla is a highly scalable, eventually consistent, distributed,

dist/debian/debian/rules

@@ -1,20 +1,21 @@
 #!/usr/bin/make -f
 
+include /usr/share/dpkg/pkg-info.mk
+
 override_dh_auto_build:
 
 override_dh_auto_clean:
 
 override_dh_auto_install:
 	dh_auto_install
-	./install.sh --root "$(CURDIR)/debian/{{product}}-jmx" --sysconfdir /etc/default
+	./install.sh --root "$(CURDIR)/debian/$(DEB_SOURCE)" --sysconfdir /etc/default
 
 override_dh_installinit:
-{{#scylla}}
+ifeq ($(DEB_SOURCE),scylla-jmx)
 	dh_installinit --no-start
-{{/scylla}}
-{{^scylla}}
+else
 	dh_installinit --no-start --name scylla-jmx
-{{/scylla}}
+endif
 
 override_dh_strip_nondeterminism:
 

dist/debian/debian_files_gen.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2020 ScyllaDB
+#
+
+#
+# This file is part of Scylla.
+#
+# Scylla is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Scylla is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Scylla.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import string
+import os
+import glob
+import shutil
+
+class DebianFilesTemplate(string.Template):
+    delimiter = '%'
+
+scriptdir = os.path.dirname(__file__)
+
+with open(os.path.join(scriptdir, 'changelog.template')) as f:
+    changelog_template = f.read()
+
+with open(os.path.join(scriptdir, 'control.template')) as f:
+    control_template = f.read()
+
+with open('build/SCYLLA-PRODUCT-FILE') as f:
+    product = f.read().strip()
+
+with open('build/SCYLLA-VERSION-FILE') as f:
+    version = f.read().strip()
+
+with open('build/SCYLLA-RELEASE-FILE') as f:
+    release = f.read().strip()
+
+shutil.rmtree('build/debian/debian', ignore_errors=True)
+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)))
+
+shutil.copy('dist/common/systemd/scylla-jmx.service', 'build/debian/debian/scylla-jmx.service')
+
+s = DebianFilesTemplate(changelog_template)
+changelog_applied = s.substitute(product=product, version=version, release=release, revision='1', codename='stable')
+
+s = DebianFilesTemplate(control_template)
+control_applied = s.substitute(product=product)
+
+with open('build/debian/debian/changelog', 'w') as f:
+    f.write(changelog_applied)
+
+with open('build/debian/debian/control', 'w') as f:
+    f.write(control_applied)

reloc/build_reloc.sh

@@ -54,4 +54,5 @@ fi
 
 mvn -B --file scylla-jmx-parent/pom.xml install
 ./SCYLLA-VERSION-GEN
+./dist/debian/debian_files_gen.py
 scripts/create-relocatable-package.py build/scylla-jmx-package.tar.gz

scripts/create-relocatable-package.py

@@ -48,3 +48,4 @@ ar.add('target/scylla-jmx-1.0.jar', arcname='scylla-jmx-1.0.jar')
 ar.add('scripts/scylla-jmx', arcname='scylla-jmx')
 ar.add('README.md')
 ar.add('NOTICE')
+ar.add('build/debian/debian', arcname='debian')