feat: pg completion for subcommands and postgres CLUSTER_NAME

supports subcommands
  - edit-config:  Edit cluster configuration
  - list:         List the Patroni members for a given Patroni

supports running anywhere and as any user

Author: waitingsong

roles/node/files/pg_completion

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+#==============================================================#
+# File      :   pg_completion
+# Desc      :   auto-completion for pg commands
+# Path      :   /etc/bash_completion.d/pg
+# License   :   MIT
+# Author    :   waitingsong
+#==============================================================#
+
+# subcommands
+#   - edit-config:  Edit cluster configuration
+#   - list:         List the Patroni members for a given Patroni
+
+
+cache_duration=30  # seconds
+cache_timestamp=0
+cache_pg_cls=""
+pg_subcommands="list edit-config"     # from patronictl
+
+if ! command -v ansible-inventory &> /dev/null; then
+  echo "ansible-inventory not found, skip auto-completion"
+  return
+fi
+
+if ! command -v jq &> /dev/null; then
+  echo "jq not found, skip auto-completion"
+  return
+fi
+
+INVENTORY_FILE=''
+if [[ -f /home/dba/pigsty/pigsty.yml ]]; then
+  INVENTORY_FILE="/home/dba/pigsty/pigsty.yml"
+fi
+
+
+# Pick up pg* clusters from inventory file
+_get_pg_cls() {
+  ansible-inventory -i "$1" --list 2>/dev/null | jq -r '.all.children | map(select(type == "string" and startswith("pg")))  | .[] '
+}
+
+_pg_completions() {
+  local subcommands="$2"
+  local cur prev words cword
+  _get_comp_words_by_ref -n : cur prev words cword
+  # echo "command: $command, subcommands: $subcommands, cur: $cur, prev: $prev, words: $words, cword: $cword"
+
+  if [[ $cword -eq 1 ]]; then
+    COMPREPLY=($(compgen -W "$pg_subcommands" -- "$cur"))
+    return
+  fi
+
+  if [[ -n $prev ]] && [[ ! " $pg_subcommands " =~ " $prev " ]]; then
+    echo $subcommands
+    return
+  fi
+
+  local FILE="${INVENTORY_FILE:-'./pigsty.yml'}"
+  if [[ $cword -eq 2 ]] && [[ -f "$FILE" ]]; then
+    local current_time=$(date +%s)
+    if [[ $cache_timestamp -eq 0 ]] || (( current_time - cache_timestamp > cache_duration )); then
+      # echo "refresh cache"
+      cache_pg_cls=$(_get_pg_cls $FILE)
+      cache_timestamp=$current_time
+    fi
+
+    if [[ -n "$cache_pg_cls" ]]; then
+      COMPREPLY=($(compgen -W "$cache_pg_cls" -- "$cur"))
+    fi
+  fi
+}
+
+complete -F _pg_completions pg
+

roles/node/tasks/admin.yml

@@ -23,15 +23,26 @@
       {% endfor %}
 
 #--------------------------------------------------------------#
-# Stage 3: Setup pam ulimit for node users         [node_ulimit]
+# Stage 3: Add node pg completion                   [node_alias]
+#--------------------------------------------------------------#
+- name: add pg completion
+  copy: src={{ item.src }} dest={{ item.dest }} mode=0644
+  tags: node_alias
+  ignore_errors: true
+  with_items:
+    - { src: pg_completion ,dest: /etc/bash_completion.d/pg }
+
+
+#--------------------------------------------------------------#
+# Stage 4: Setup pam ulimit for node users         [node_ulimit]
 #--------------------------------------------------------------#
 - name: set pam ulimit
   tags: node_ulimit
   copy: src=limits.conf dest=/etc/security/limits.d/limits.conf mode=0644
 
 
 #--------------------------------------------------------------#
-# Stage 4: Create data dir if not exists             [node_data]
+# Stage 5: Create data dir if not exists             [node_data]
 #--------------------------------------------------------------#
 - name: assure node data dir exists
   tags: node_data
@@ -45,7 +56,7 @@
 
 
 #--------------------------------------------------------------#
-# Stage 5: Create default users/groups              [node_admin]
+# Stage 6: Create default users/groups              [node_admin]
 #--------------------------------------------------------------#
 - name: create os node users and groups
   tags: node_admin
@@ -107,4 +118,4 @@
         key: "{{ lookup('file', item) }}"
       with_fileglob:
         - "~/.ssh/id*.pub"
-...
+...