initial import

postgresql/postgresql-check-db-dir

@@ -0,0 +1,49 @@
+#!/bin/sh
+
+# This script verifies that the postgresql data directory has been correctly
+# initialized.  We do not want to automatically initdb it, because that has
+# a risk of catastrophic failure (ie, overwriting a valuable database) in
+# corner cases, such as a remotely mounted database on a volume that's a
+# bit slow to mount.  But we can at least emit a message advising newbies
+# what to do.
+
+PGDATA="$1"
+
+if [ -z "$PGDATA" ]
+then
+    echo "Usage: $0 database-path"
+    exit 1
+fi
+
+# PGMAJORVERSION is major version
+PGMAJORVERSION=12
+# PREVMAJORVERSION is the previous major version
+PREVMAJORVERSION=11
+
+# Check for the PGDATA structure
+if [ -f "$PGDATA/PG_VERSION" ] && [ -d "$PGDATA/base" ]
+then
+    # Check version of existing PGDATA
+    if [ x`cat "$PGDATA/PG_VERSION"` = x"$PGMAJORVERSION" ]
+    then
+        : A-OK
+    elif [ x`cat "$PGDATA/PG_VERSION"` = x"$PREVMAJORVERSION" ]
+    then
+        echo $"An old version of the database format was found."
+        echo $"See https://wiki.archlinux.org/index.php/PostgreSQL#Upgrading_PostgreSQL"
+        exit 1
+    else
+        echo $"An old version of the database format was found."
+        echo $"You need to dump and reload before using PostgreSQL $PGMAJORVERSION."
+        echo $"See http://www.postgresql.org/docs/$PGMAJORVERSION/static/upgrading.html"
+        exit 1
+    fi
+else
+    # No existing PGDATA! Warn the user to initdb it.
+    echo $"\"$PGDATA\" is missing or empty. Use a command like"
+    echo $"  su - postgres -c \"initdb --locale en_US.UTF-8 -D '$PGDATA'\""
+    echo $"with relevant options, to initialize the database cluster."
+    exit 1
+fi
+
+exit 0