EXODUS Knowledge

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1 TMUX Screens

To create the EXODUS maintenance/programming environment

exodus#: ./tmux.exodus
SCREEN NAME      STANDARD PATH                            PURPOSE
#ex1_root        - /root                                  - general usage 
#exodus          - /root/exodus                           - 
#exodus src      - /root/exodus/exodus/libexodus/exodus   - LibExodus is the core EXODUS library source files (emulating AREV CRUD)
#exo cli         - /root/exodus/cli/src                   - Core EXODUS program which can be executed from bash (clearfile, edir, edic, compile)
#service         - /root/exodus/service                   - Default working environment for EXODUS only service, including EXODUS core www and data directories. Also used to keep NEOSYS database installation scripts.
#ser src         - /root/exodus/service/src               -
#neosys          - /root/neosys                           - ./doall
#neo src         - /root/neosys/src                       -
#hosts           - /root/hosts                            -   
#test src        - /root/exodus/test/src                  - 
#t10             - ~/                                     - 
#t11             - ~/                                     - 
#t12             - ~/                                     - 

1.1 Object Code/Libraries

LIVE and TEST processes use different sets of object code. TEST processes use libraries in ~/lib/, whereas LIVE processes use object code in ~/neo/lib

This means development & testing can be done stress free on TEST database, as opposed to testing on production databases.

When compiling using edic, the TEST object code is updated if the compilation is successful. (~/lib) In order to apply a tested patch to LIVE see Update LIVE programs.

1.2 Dictionaries

Dictionaries, the files used to describe the fields of a file's record. Unlike in AREV, there is a copy of all dictionaries in each pgsql database (In AREV, updating a dictionary would affect all the databases).

1.3 Processes

The TEST process for all database use the same object code stored in /root/lib, whereas all LIVE process use the object code in /root/neo/.

1.4 Postgres

Connect into postgres shell:

sudo -u postgres psql

List databases once in postgres shell:


Delete a database:

sudo -u postgres dropdb <dbcode>

1.5 ./doall

1.5.1 General

Screen 6: ./doall script contains all the necessary information(codes) to setup an installation. It includes scripts to backup, restore, create an Apache site, create/start/stop/status a service, import an AREV database into postgres and more.

1.5.2 backup_db

  • Does a backup & restore of a LIVE database into the corresponding TEST database.
  • Backup <dbcode>.sql file is written to /root/backups/sql; which is rsynced to nl19:/backups/current/exodus/
  • Unlike AREV, postgres can perform a "backup" of a database whilst the system is in use.

2 Git

There are two repositories, one for EXODUS and the other for NEOSYS.

2.1 Using git to make changes

Before following steps you must have a tested updated to a program/file/script. Do not commit untested changes to avoid a messy git history of reverts.

Update your local repo before committing to local repo using the g alias for "git pull --ff-only ; git push && git status'":


Check which updates/files have not yet been staged and/or committed: Add your updates to the staged area:

git add <filename>

or if all the changes made need to be staged:

git add -a

Make a commit with a descriptive message on purpose of updates:

git commit -m <description n purpose of changes>

Again use g alias:


2.2 Other useful git cmds

Do not use this commands unless you know what WILL happen.

  • git pull - Instead use the safe "git pull --ff-only"

Stick to the alias "g" which does "git pull --ff-only ; git push && git status'"

  • git log - display history of commits to master branch
  • git diff - display the differences in files between working files and files in local repo.
  • git status - display: which updated files are staged/not staged(tracked)
  • git stash -
  • git branch - switch to a new branch
  • git branch <branchname> - will switch to this branch only if it exists
  • git checkout - DESTROYS/Updates the state of local working directory with the state of the files in the local repo. (YOU WILL LOSE non staged updates)
  • git restore <filename> - DESTROYS/Updates the file with the version in the local repo. (like with git checkout but for a specific file)
  • git checkin -
  • git revert <commitHash> - reverses a specific commit (use git log to get the chosen commit hash)

3 Converting AREV to EXODUS

3.1 Decompile AREV to C++

(Do in win10a Maintenance mode)

  1. Apply tested patch to win10a (master AREV Dev system)
    • ADECOM <programname> *single program
    • ADECOMALL *all programs (CHECK THIS FIRST)
    • ADECOM <prog1> <prog2> *(CHECK IF THIS WORKS)

3.2 Send c++ files from win10a to nl19

(Do in win10a Cygwin)

  1. /d/exodus/arev/syncup.sh

3.3 Get c++ files from nl19 to exodus

(Do in Exodus system)

  1. If cpp in SYS then: ~/exodus/service/src ./getpickos
  2. If cpp in MED JOB FIN GEN AGY then: *~/neosys/src ./getpickos
  3. Compile single cpp then: c <programname> e.g "c monitor2"
  4. Compile all cpp then: ./compall (PENDING WHICH/WHERE? many compall)

3.4 Compile C++ files to TEST system

    • ./test <DBNAME>
    • ~/neosys ./doall TEST <DBNAME> restart #to get one service to start start using the new lib files
    • ~/neosys ./doall TEST all restart #to get all the services to start start using the new lib files

3.5 Install C++ files to LIVE System


  1. ~/exodus/service/ ./copyall #to copy all the ~/lib and bin files to ~/live/lib and bin ... which is used by all exodus/live services

4 Writing Standard Exodus Core Function/Method Testing

Screen 9: ~/exodus/test/src/ There are a series of test programs that check whether methods/functions behave as intended. They do this using the function, assert.. a 1 or more argument values produce one and only one output)

e.g test_multilang.cpp or test_sort.cpp

Two methods of running test programs:

  • Screen 9: make test
  • after compiling using edic/compile/c, enter test_prog_name. (Since compile has moved it to ~/bin)

Difference between the two methods is make calls gdb directly; whereas ~/bin/test_prog_name uses exodus compile program

  1. ~/neosys ./doall LIVE all restart

5 Updating a pgsql function in an exodus dictionary


6 Troubleshooting postfix emailing issues

To view current configuration in main.cf

postconf -n

To update the value of a parameter

postconf relayhost=mailout.neosys.com:2500

To restart postfix service

service postfix restart

Send a test email using "mail" and watch the logs to verify

mail <email>
journalctl -f

7 Development and deployment using 'dat' files

7.1 Rationale

Part of system development is the creation of various data that is neither programs nor layout i.e. not cpp, h, html, js, php files etc.

For example:

  • Dictionaries are data about data.
  • Language files are data about text to use for various languages.
  • “Change logs” are data about changes in the system.

Historically in EXODUS and NEOSYS we have deployed the above data in exodus database files using SQL text files.

However SQL files are not convenient for development.

Therefore we will now use 'dat' text files so that standard development tools including editors and git can be fully exploited.

7.2 'dat' files

Each database file is represented by an os directory of the same name.

Each record in the database file is represented by an os text file where filename is the primary key.

Each line in the os text file represents one field in the db record. In other words, db record FM characters are represented by new line characters in dat files. Any actual new line characters required in the record, and any backslashes, are escaped and appear as '\n' and '\\' in dat files. Other database field separator characters, VM, SM, TM and STM are stored without any conversion.

The text files are automatically installed into databases as database files on service startup. Any database functions embedded in the text files, like pgsql, are also automatically installed at the same time.

7.3 Editing and deploying a 'dat' file

It is currently a three step process to edit and deploy such dat files.

Edit the dat file. Note that EXODUS service and NEOSYS have different src/dat folders.

Editing language items:

edir dat/alanguage/SCHEDULES*ARABIC

Editing a dictionary item:

edir dat/dict.materials/DEADLINE

Editing a pgsql function in a dictionary:

edir dat/dict.materials/DEADLINE 8

Install all dat files. This step might be removed at a later date.

This will cause all test databases to immediately restart and load any dat file changes into dictionaries and data files and also create any new or modified pgsql functions.

cd ~/neosys/src && ./compall

or, if exodus/service/dat files were edited

cd ~/exodus/service/src && ./compall

Copy all programs and dat files to live. This will cause all live databases to automatically restart and do the same as the test databases mentioned above.

cd ~/exodus/service && ./copyall CONFIRM