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Dir : /usr/pgsql-9.6/bin/
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Dir : //usr/pgsql-9.6/bin/postgresql96-check-db-dir

#!/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., 9.6.0
# Note: the specfile inserts the correct value during package build
PGVERSION=9.6.23
# PGMAJORVERSION is major version, e.g., 9.6 (this should match PG_VERSION)
PGMAJORVERSION=`echo "$PGVERSION" | sed 's/^\([0-9]*\.[0-9]*\).*$/\1/'`
# PREVMAJORVERSION is the previous major version, e.g., 9.5, for upgrades
# Note: the specfile inserts the correct value during package build
PREVMAJORVERSION=9.5
# PGDOCDIR is the directory containing the package's documentation
# Note: the specfile inserts the correct value during package build
PGDOCDIR=/usr/share/doc/postgresql96

# 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 \"/usr/pgsql-9.6/bin/postgresql96-setup initdb\" to initialize the database cluster."
    echo $"See $PGDOCDIR/README.rpm-dist for more information."
    exit 1
fi

exit 0