add PostgreSQL install script

examples/postgres-install.sh

@@ -0,0 +1,91 @@
+#!/bin/bash
+echo "=== INSTALLING POSTGRES ==="
+sleep 1
+
+set -e
+set -u
+
+# Notes on convention:
+# variables expected to be imported or exported are ALL_CAPS and prefixed with POSTGRES_
+# variables expected to remain private are lowercase and prefixed as to not be affected by `source`
+
+# source .env
+DOWNLOADS_DIR=${DOWNLOADS_DIR:-"$HOME/Downloads"}
+OPT_DIR=${OPT_DIR:-"$HOME/Applications"}
+DATA_DIR=${DATA_DIR:-"$HOME/.local/share"}
+POSTGRES_DATA_DIR=${POSTGRES_DATA_DIR:-"$DATA_DIR/postgres/var"}
+mkdir -p "$DOWNLOADS_DIR"
+mkdir -p "$OPT_DIR"
+mkdir -p "$POSTGRES_DATA_DIR"
+
+is_macos="$(uname -a | grep -i darwin)"
+if [ -n "$is_macos" ]; then
+  TRASH_DIR=${TRASH_DIR:-"$HOME/.Trash"}
+  POSTGRES_VERSION=${POSTGRES_VERSION:-"10.13"} # 10.13-1
+  POSTGRES_BUILD=${POSTGRES_BUILD:-"1-osx"}
+  postgres_pkg="postgresql-${POSTGRES_VERSION}-${POSTGRES_BUILD}-binaries.zip"
+  is_zip="true"
+else
+  TRASH_DIR=${TRASH_DIR:-"$HOME/tmp"}
+  POSTGRES_VERSION=${POSTGRES_VERSION:-"10.12"} # 10.12-1
+  POSTGRES_BUILD=${POSTGRES_BUILD:-"1-linux-x64"}
+  postgres_pkg="postgresql-${POSTGRES_VERSION}-${POSTGRES_BUILD}-binaries.tar.gz"
+  is_zip=""
+fi
+
+mkdir -p "$TRASH_DIR"
+
+# https://www.enterprisedb.com/download-postgresql-binaries
+
+postgres_tmp="$(mktemp -d -t postgres-installer.XXXXXXXX)"
+postgres_unpack="pgsql"
+postgres_dir="postgres-server-${POSTGRES_VERSION}"
+postgres_lnk="postgres-server"
+
+echo "Here's what this script will do:"
+echo "    • Download postgres server v${POSTGRES_VERSION}"
+echo "    • Install it to ${OPT_DIR}/${postgres_dir}"
+echo "    • Link that to ${OPT_DIR}/${postgres_lnk}"
+echo "    • Create a database in $POSTGRES_DATA_DIR (first-time only)"
+echo "    • Start Postgres with $OPT_DIR/${postgres_lnk}/bin/pg_ctl"
+
+echo ""
+echo "Working directory is ${postgres_tmp}"
+echo ""
+if [ -f "${DOWNLOADS_DIR}/${postgres_pkg}" ]; then
+  rsync -aq "${DOWNLOADS_DIR}/${postgres_pkg}" "$postgres_tmp/$postgres_pkg"
+else
+  echo "Downloading $postgres_pkg"
+  curl -fSL --progress-bar 'https://get.enterprisedb.com/postgresql/'"${postgres_pkg}"'?ls=Crossover&type=Crossover' -o "$postgres_tmp/$postgres_pkg"
+  rsync -aq "$postgres_tmp/$postgres_pkg" "${DOWNLOADS_DIR}/"
+fi
+pushd "$postgres_tmp" >/dev/null
+  if [ -n "$is_zip" ]; then
+    unzip -q "$postgres_pkg"
+  else
+    tar xvf "$postgres_pkg"
+  fi
+  mv "$postgres_unpack" "$postgres_dir"
+popd >/dev/null
+if [ -d "$OPT_DIR/$postgres_dir" ]; then
+  mv "$OPT_DIR/$postgres_dir" "$TRASH_DIR/$postgres_dir".$(date '+%Y-%m-%d_%H-%M-%S' )
+  echo "moved old $OPT_DIR/$postgres_dir to the Trash folder"
+fi
+mv "$postgres_tmp/$postgres_dir" "$OPT_DIR/"
+rm -f "$OPT_DIR/$postgres_lnk"
+ln -s "$OPT_DIR/$postgres_dir" "$OPT_DIR/$postgres_lnk"
+
+echo "postgres" > "${postgres_tmp}/pwfile"
+
+mkdir -p "$POSTGRES_DATA_DIR"
+chmod 0700 "$POSTGRES_DATA_DIR"
+if [ ! -f "$POSTGRES_DATA_DIR/postgresql.conf" ]; then
+  "$OPT_DIR/$postgres_lnk/bin/initdb" \
+    -D "$POSTGRES_DATA_DIR/" \
+    --username postgres --pwfile "${postgres_tmp}/pwfile" \
+    --auth-local=password --auth-host=password
+fi
+
+echo "PostgreSQL installed, database initialized in $POSTGRES_DATA_DIR/"
+
+rm -rf "${postgres_tmp}"