#!/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

# PGVERSION is the full package version, e.g., 9.1.2

# Note: the specfile inserts the correct value during package build

PGVERSION=xxxx

# PGMAJORVERSION is major version, e.g., 9.1 (this should match PG_VERSION)

PGMAJORVERSION=`echo "$PGVERSION" | sed 's/^\([0-9]*\.[0-9]*\).*$/\1/'`

# PREVMAJORVERSION is the previous major version, e.g., 8.4, for upgrades

# Note: the specfile inserts the correct value during package build

PREVMAJORVERSION=xxxx

# PGDOCDIR is the directory containing the package's documentation

# Note: the specfile inserts the correct value during package build

PGDOCDIR=xxxx

# 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 $"Use \"postgresql-setup upgrade\" to upgrade to version $PGMAJORVERSION."

        echo $"See $PGDOCDIR/README.rpm-dist for more information."

        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 \"postgresql-setup initdb\" to initialize the database cluster."

    echo $"See $PGDOCDIR/README.rpm-dist for more information."

    exit 1

fi

exit 0