Cache data and scripts for managing the GMT data server

Current master server is: gmtserver.soest.hawaii.edu, in directory /export/gmtserver/gmt/data

The actual URL is: www.soest.hawaii.edu/gmt/data [you cannot browse there]

Master data server URL: https://oceania.generic-mapping-tools.org

To clone this repo you can run

git clone https://github.com/GenericMappingTools/gmtserver-admin

GMT Core developers can add, modify or remove cache files from their working copy of the gmtserver-admin repo, and after merging the gmt server will automatically update its working copy via the crontab script, and if there are changes the key gmt_hash_server.txt and gmt_data_server.txt files will be rebuilt as needed.

For now, the earth_relief_xxy.grd files are maintained and updated manually. Changes to these need to be followed by a manual run of srv_update_sha256.sh. The production of global grids are based on recipes in the recipes folder. These recipes are given to script srv_downsampler.sh which produces a new set of grids in the staging directory. If these are satisfactory they can be moved to the top data directory.

The working directory on the gmtserver is updated once an hour via a crontab script running under local account pwessel with this crontab entry:

0 * * * *      /export/gmtserver/gmt/gmtserver-admin/scripts/srv_git_update.sh > /export/gmtserver/gmt/LOGS/git_update.cron.log 2>&1