#!/bin/sh

# This script verifies that the EDB Postgres Advanced Server 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

# PGVERSION is the full package version, e.g., EDB_MAJOR_VERSION
# Note: the specfile inserts the correct value during package build
PGVERSION=15
# PGMAJORVERSION is major version, e.g., EDB_MAJOR_VERSION (this should match PG_VERSION)
PGMAJORVERSION=`echo "$PGVERSION" | sed 's/^\([0-9]*\.[0-9]*\).*$/\1/'`
# PGDOCDIR is the directory containing the package's documentation
# Note: the specfile inserts the correct value during package build
PGDOCDIR=/usr/edb/as15/share/doc/README-rpm-dist.txt

# 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."
        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 $PGDOCDIR/README.rpm-dist for more information."
        exit 1
    fi
else
    # No existing PGDATA! Warn the user to initdb it.
    echo $"\"$PGDATA\" is missing or empty."
    echo $"Use \"/usr/edb/as${PGVERSION}/bin/edb-as-${PGVERSION}-setup initdb\" to initialize the database cluster."
    echo $"See $PGDOCDIR/README.rpm-dist for more information."
    exit 1
fi

exit 0
