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<typo fs:xx-large; fw:bold>Cygwin: Salvation on Windows</typo>
====== GA Distribution ======
Cygwin as-distributed provides a rather unique, and sometimes inconvenient, mechanism for installation.  A small network-install executable is provided, which consults online repositories for downloads of installation artifacts.  The install executable also relies on locally-written meta-data to keep track of the entire installation footprint.
===== Installation =====
===== Removal =====
  * Uninstall all services
    * List services installed:  ''cygrunsrv -L'' \\ // **NOTE:** the ''inetd'' service won't show in the list, even if installed/running, but stopping it and removing it will work regardless //
    * Stop each service with: ''cygrunsrv --stop service_name''
    * Remove each service with: ''cygrunsrv --remove service_name''
  * Stop X server, after stopping any cygwin X clients that are running
  * If using the ''cyglsa'' authentication mechanisms (hopefully not - pain), revert all of that
  * Remove the ''cygwin'' (or ''cygwin64'') folder tree
  * Remove all shortcuts installed by the installer
  * Remove references to the cygwin folder tree from environment variables (most notably, ''PATH'')
  * Using the ''regedit'' program, remove the registry tree(s) ''Software\Cygwin'' under ''HKEY_LOCAL_MACHINE'' and/or ''HKEY_CURRENT_USER''


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====== Backup Client-Side Agent ======
Cygwin makes a particularly powerful solution for a client-side agent in providing central command-n-control with a centralized backup/archival system.  Here are some details around how Albert Lea Data has devised such a solution.

===== Installation =====
  * Create an administrative user (we'll refer to as ''$USR'') for the backup system identity to be used, log into Windows as that user
  * Acquire the ZIP archive to the client machine: [[http://www.albertleadata.org/pub/backup-client-agent.zip]]
  * Extract the contents of the ZIP archive to a working location
  * Move the ''cygwin64'' folder extracted from the ZIP archive to suitable destination, we'll refer to as ''$CYGDIR'' // (either ''c:\'' or ''d:\'' recommended) //
  * Edit the ''.reg'' files extracted from the ZIP archive to ensure path references are corrected
  * Right-click on each ''.reg'' file and choose ''Merge''
  * Right-click on the ''Cygwin.bat'' batch file in the ''$CYGDIR'' folder and choose ''Run as administrator''
  * Run these commands:<code>mkpasswd -l > /etc/passwd
mkgroup -l > /etc/group
chmod 111 /var
chmod +t /var
ssh-host-config
</code> // Make sure to enter ''ntsec'' for CYGWIN value, and specify your new admin user when prompted //
  * Start the SSH service:  ''cygsrvrun -S sshd''
  * SSH to the Windows box and log in as new admin user
  * Create SSH key with:  ''ssh-keygen -t rsa'' // ... make sure to specify empty passphrase //
  * Populate ''authorized_keys'' file with server's SSH key for password-less operation
  * Populate backup server's host key // (typically just SSH to it and answer ''yes'' at key prompt) //
  * Ensure home directory has group-write disabled, for example:  ''chmod g-w ~''

===== Packaging & Upgrading =====
This is the recipe for how the client-side agent footprint is bundled, and how to go about upgrading it.
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