Rename retention script per feedback

Signed-off-by: Michael Winters <fedora@mwinters.net>

roles/batcave/files/public-db-copy.sh

@@ -7,4 +7,4 @@ export ANSIBLE_HOST_KEY_CHECKING=False
 /srv/web/infra/ansible/scripts/public-db-copy >& /dev/null
 
 # Delete old datanommer-incremental backups
-/srv/web/infra/ansible/scripts/iso-file-retention /srv/web/infra/db-dumps/datanommer-incremental >& /dev/null
+/srv/web/infra/ansible/scripts/file-retention-iso-date /srv/web/infra/db-dumps/datanommer-incremental >& /dev/null

roles/postgresql_server/files/datanommer-export-day

@@ -143,5 +143,5 @@ echo
 echo "$(date -Iseconds): export done!"
 
 echo "Running retention script for '$DESTDIR'..."
-    /usr/local/bin/iso-file-retention "$DESTDIR"
+    /usr/local/bin/file-retention-iso-date "$DESTDIR"
 echo

roles/postgresql_server/tasks/datanommer.yml

@@ -15,8 +15,8 @@
   - postgresql
 
 
-- name: Copy iso-file-retention script
-  ansible.builtin.copy: src=scripts/iso-file-retention dest=/usr/local/bin/iso-file-retention mode=0755
+- name: Copy file-retention-iso-date script
+  ansible.builtin.copy: src=scripts/file-retention-iso-date dest=/usr/local/bin/file-retention-iso-date mode=0755
   tags:
   - datanommer
   - postgresql

scripts/file-retention-iso-date

@@ -1,8 +1,12 @@
 #!/bin/bash
 # vim: ts=4:sw=4:expandtab:tw=100
 
-# Deletes files prefixed with ISO dates (YYYY-MM-DD-) older than RETENTION_DAYS days,
-# but always retains the most-recent MIN_KEEP files even if they're "old".
+# This script manages a set of backup files which are prefixed with ISO dates  (YYYY-MM-DD).
+# - As new files come in, we want to delete the old ones.
+#   - RETENTION_DAYS decides how old is "old".
+# - But if no new files come in (e.g. the backup process is broken), we don't want to
+#   end up deleting _all_ the files, just because they're old.
+#   - MIN_KEEP decides how many files to keep.
 #
 # Usage: ./retain.sh --dry-run <directory>