From Fedora Project Wiki
This is a DRAFT.

Preupgrade Assistant contents Packaging guidelines

How to package a Preupgrade Assistant contents

Contents files are packaged as a subpackage of main package (e.g mariadb).

Naming guidelines

Every Preupgrade Assistant content subpackage name must start with preupgrade-assistant- followed by original package name.

For example Preupgrade Assistant content subpackage for mariadb will be named preupgrade-assistant-mariadb.

Dependencies

  • All packages must have
 Requires: preupgrade-assistant
 BuildRequires: preupgrade-assistant-devel

Devel package contains macros and contents validating check script.

Architecture

  • All preupgrade-assistant-* subpackages must be architecture independent, i.e. have BuildArch: noarch.

Macros

  • Macro denoting the parent directory where the package files go is %{preupgrade_dir}. This currently expands to /usr/share/preupgrade.
  • Macro %{preupg_number} means source release from which the system is going to be upgraded, e.g. Fedora 22.
  • Macro %{postupg_number} means target release to which the system is going to be upgraded, e.g. Fedora 23.
  • Macro %{preupg_results} means where the contents files are generated
  • Macro %{fedora_preupgrade_name} means Fedora%{preupg_number}_%{postupg_number}, e.g. Fedora22_23
  • Macro %{fedora_preupgrade_dir} reference to /usr/share/preupgrade/%{fedora_preupgrade_name}

Prep section

Copy all contents files to %{fedora_preupgrade_name}/%{name} directory.

Content files are:

  • INI file
  • check_script (python or bash)
  • text file with solution description.

INI file structure

INI file is checked by %{preupgrade_prep} script. If something is missing user is informed. 

[preupgrade]
content_title: Short content name
author: Your Name <yname@ydomain.com>
content_description: 'Enter your description here'
config_file: <configuration_file_separated_by_comma> THIS IS OPTIONAL. IT INFORMS ADMINISTRATOR WHAT FILES ARE AFFECTED
check_script: <checking script name created during this guide>
applies_to: <specify_package_needs_to_be_on_system. if_not_installed_then_NOT_APPLICABLE> , comma separated
requires: <specify_package_needs_to_be_on_system> THIS IS OPTIONAL

The elements description:

  • content_title - Defines a single item to be checked as a part of a group.
  • author - Author of the content, will be used in automatically created header of scripts
  • content_description - Describes a rule and what the checks are.
  • config_file - Defines which configuration files are checked.
  • check_script - A script used for checking the system before upgrade. If the script does not exist, the user is notified and the group.xml autogeneration fails.
  • applies_to - Package checked by the script, if not available check will not run. Result is NOT_APPLICABLE.
  • requires - If a check script needs awk binary then package gawk should be mentioned here.

Bash check script template

Template for bash check script 

#!/bin/bash

. /usr/share/preupgrade/common.sh

#END GENERATED SECTION

# This check can be used if you need root privilegues

# Copy your config file from RHEL6 (in case of scenario RHEL6_7) 
# to Temporary Directory
CONFIG_FILE="full_path_to_your_config_file"
mkdir -p $VALUE_TMP_PREUPGRADE/cleanconf/$(dirname $CONFIG_FILE)
cp $CONFIG_FILE $VALUE_TMP_PREUPGRADE/cleanconf/$CONFIG_FILE

# Now check you configuration file for options
# and for other stuff related with configuration

# If configuration can be used on target system (like RHEL7 in case of RHEL6_7)
# the exit should be RESULT_PASS

# If configuration can not be used on target system (like RHEL 7 in case of RHEL6_7)
# scenario then result should be RESULT_FAIL. Correction of
# configuration file is provided either by solution script
# or by postupgrade script located in $VALUE_TMP_PREUPGRADE/postupgrade.d/

# if configuration file can be fixed then fix them in temporary directory
# $VALUE_TMP_PREUPGRADE/$CONFIG_FILE and result should be RESULT_FIXED
# More information about this issues should be described in solution.txt file
# as reference to KnowledgeBase article.

grep "Sometext" $CONFIG_FILE
if [ $? -ne 0 ]; then
    log_info "Config file $CONFIG_FILE will be fixed by solution script"
    # postupgrade.d directory from your content is automatically copied by
    # preupgrade assistant into $VALUE_TMP_PREUPGRADE/postupgrade.d/ directory
    exit $RESULT_FAIL
fi

exit $RESULT_PASS

Python check script template

Template for python check script 

#!/usr/bin/python
# -*- Mode: Python; python-indent: 8; indent-tabs-mode: t -*- 

import sys, os, errno
import datetime

from preup.script_api import *

#END GENERATED SECTION
component = "Specify component name used for logging"
# exit functions are exit_{pass,not_applicable, fixed, fail, etc.}
# logging functions are log_{error, warning, info, etc.}
# for logging in-place risk use functions log_{extreme, high, medium, slight}_risk

def main():
    if os.geteuid() != 0:
        sys.stdout.write("Need to be root.\n")
        log_slight_risk("The script needs to be run under root account")
        exit_error()


if __name__ == "__main__":
	set_component(component) 
	main()
	exit_pass()

Build section

Run command: 

%{preupgrade_prep} %{fedora_preupgrade_name}/%{name}/

%{preupgrade_prep} command has to success. Warning can be suppressed.

Install section

All files from preupgrade directory should be installed with 

%install
...
mkdir -p ${buildroot}%{fedora_preupgrade_dir}/%{name}
install -p -m 755 %{SourceY} ${buildroot}%{fedora_preupgrade_dir}/%{name}/check.sh
install -p -m 644 %{SourceZ} ${buildroot}%{fedora_preupgrade_dir}/%{name}/solution.txt
install -p -m 644 %{fedora_preupgrade_name}-%{preupg_results}/%{name}/group.xml ${buildroot}%{fedora_preupgrade_dir}/%{name}/group.xml

Files section

  • Directory where Preupgrade Assistant installs files and directories must be owned by the subpackage
%files
...
%files -n preupgrade-assistant-%{name}
%dir %{fedora_preupgrade_dir}/%{name}
  • All files except text files should be listed like
%files
...
%files -n preupgrade-assistant-%{name}
%{fedora_preupgrade_dir}/%{name}/*.{sh,py}
%{fedora_preupgrade_dir}/%{name}/*.xml
  • All text files from content should be listed via
%files
...
%files -n preupgrade-assistant-%{name}
%doc %{fedora_preupgrade_dir}/%{name}/*.txt

Directory ownership

Directories %{preupgrade_dir} and %{fedora_preupgrade_dir} are owned by package preupgrade-assistant itself and should not be owned by your package.

Sample SPEC

Name:             foo
Version:          1.0
Release:          1%{?dist}
Summary:          An example package
URL:              http://example.com
License:          MIT

Source0:          http://example.com/foo/foo-%{version}.tgz
Source1:          foo.ini
Source2:          foo.sh
Source3:          foo.txt

[Bulk of foo packaging elided]

%package -n preupgrade-assistant-%{name}
BuildRequires:    preupgrade-assistant-devel
Requires:         preupgrade-assistant

%description -n preupgrade-assistant-%{name}
Files used by preupgrade to assist with upgrading between
major releases of the foo package via fedup.

%prep
# Copy all content files to %{preupgrade_dir}
mkdir -p %{fedora_preupgrade_name}/%{name}
cp %{SOURCE1} %{fedora_preupgrade_name}/%{name}/%{SOURCE1}
cp %{SOURCE2} %{fedora_preupgrade_name}/%{name}/%{SOURCE2}
cp %{SOURCE3} %{fedora_preupgrade_name}/%{name}/%{SOURCE3}

%build
%{preupgrade_build} %{fedora_preupgrade_name}/%{name}/

%install
mkdir -p %{buildroot}%{fedora_preupgrade_dir}/%{name}
install -p -m 755 %{SOURCE2} %{buildroot}%{fedora_preupgrade_dir}/%{name}/%{SOURCE2}
install -p -m 644 %{SOURCE3} %{buildroot}%{fedora_preupgrade_dir}/%{name}/%{SOURCE3}
install -p -m 644 %{fedora_preupgrade_name}-%{preupg_results}/%{name}/group.xml %{buildroot}%{fedora_preupgrade_dir}/%{name}/group.xml


%files -n preupgrade-assistant-%{name}
%dir %{fedora_preupgrade_dir}/%{name}
%doc %{fedora_preupgrade_dir}/%{name}/*.txt
%{fedora_preupgrade_dir}/%{name}/*.{py,sh}
%{fedora_preupgrade_dir}/%{name}/*.xml
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