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Current File : /usr/share/dbconfig-common/dpkg/common
# -*- mode: sh -*-
###
### common shell include for dbconfig-common aware packages.
###
# usage: /usr/share/dbconfig-common/dpkg/common $package $dpkg_argv
# (where $dpkg_argv is $@ as passed to the maintainer scripts)

#set -x

# get some internal helper functions, like _dbc_sanity_check
. /usr/share/dbconfig-common/internal/common

dbc_config(){
    _dbc_debug "dbc_config() $@"
    ###
    ### some global variables
    ###
    dbc_share="/usr/share/dbconfig-common"
    dbc_package="$1"
    dbc_basepackage=$(echo $dbc_package | cut -d_ -f1)
    dbc_command="$2"
    dbc_oldversion="$3"

    if ! _dbc_sanity_check package command; then
        dbc_install_error "determining package or command" || return $?
        [ "$dbc_tried_again" ] && return 0
    fi

    dbc_confdir="/etc/dbconfig-common"
    dbc_globalconfig="$dbc_confdir/config"
    dbc_packageconfig="$dbc_confdir/$dbc_package.conf"

    ###
    ### some internal variables
    ###
    # templates common to all database types
    dbc_standard_templates="database-type dbconfig-install dbconfig-upgrade dbconfig-remove dbconfig-reinstall password-confirm app-password-confirm purge upgrade-backup passwords-do-not-match install-error upgrade-error remove-error internal/reconfiguring internal/skip-preseed missing-db-package-error"

    # templates common to mysql database types
    dbc_mysql_templates="mysql/authplugin mysql/method remote/host remote/newhost mysql/app-pass mysql/admin-user mysql/admin-pass remote/port db/dbname db/app-user"

    # templates common to postgresql database types
    dbc_pgsql_templates="pgsql/method remote/host remote/newhost pgsql/app-pass pgsql/admin-user pgsql/admin-pass remote/port pgsql/authmethod-admin pgsql/authmethod-user pgsql/changeconf pgsql/manualconf db/dbname db/app-user pgsql/no-empty-passwords"

    # templates common to sqlite database types
    dbc_sqlite_templates="db/dbname db/basepath"

    # database types supporting authenticated access
    dbc_authenticated_dbtypes="mysql pgsql"

    # database types supporting remote access
    dbc_remote_dbtypes="mysql pgsql"

    # database types storing files on the filesystem
    dbc_fs_dbtypes="sqlite sqlite3"

    ###
    ### source the pre-existing config, if it exists
    ###
    if [ -f $dbc_globalconfig ]; then
        . $dbc_globalconfig
    fi

    ###
    ### Allow priorities to be flexible
    ###
    if [ ! "$dbc_prio_low" ] ; then
        dbc_prio_low="low"
    fi
    if [ ! "$dbc_prio_medium" ] ; then
        dbc_prio_medium="medium"
    fi
    if [ ! "$dbc_prio_high" ] ; then
        dbc_prio_high="high"
    fi
    if [ ! "$dbc_prio_critical" ] ; then
        dbc_prio_critical="critical"
    fi

    # set the priority of "remote database" related questions for
    # the database types that support it
    if [ "$dbc_remote_questions_default" = "true" ]; then
        dbc_remote_questions_priority=$dbc_prio_high
        dbc_default_pgsql_authmethod_admin="password"
    else
        dbc_remote_questions_priority=$dbc_prio_low
        dbc_default_pgsql_authmethod_admin="ident"
    fi

    dbc_set_dbtype_defaults $dbc_dbtype
}

dbc_set_dbtype_defaults(){
    local happy supported_dbtypes comma
    _dbc_debug "dbc_set_dbtype_defaults() $@"

    # if dbtype isn't set, but dbc_hardcoded_dbtype is set, set dbtype to that
    if [ "$dbc_hardcoded_dbtype" ]; then
        dbc_dbtype="$dbc_hardcoded_dbtype"
    fi

    # If dbc_dbtypes only has one installed client, set dbtype to that. While
    # we are at it let's also update dbc_dbtypes with only those dbtypes that
    # are both supported and installed.
    if [ "$dbc_dbtypes" ] ; then
        # This code was originally in dpgk/config
        supported_dbtypes=$(echo $dbc_dbtypes | sed 's/,/ /g')
        dbc_dbtypes=""
        comma="" # Prevent comma before first field
        for db in $supported_dbtypes ; do
            if dbc_detect_installed_dbtype $db; then
                if [ ! "$happy" ] ; then
                    dbc_default_dbtype=$db
                fi
                dbc_dbtypes="$dbc_dbtypes$comma$db"
                comma=", "
                happy="yes"
            fi
        done

        # If we are not happy I am pretty sure there is a bug in the calling
        # package.
        if [ ! "$happy" ] ; then
            dbc_error="Multiple database support detected, but apparently missing Depends on relevant dbconfig-<databasetype> packages. Please report this issue to the package maintainer."
            dbc_install_error "analyzing supported database types" || return $?
            [ "$dbc_tried_again" ] && return 0
        fi

        # Only one installed supported dbtype found, let's use it.
        if ! echo "$dbc_dbtypes" | grep -q "," ; then
            dbc_dbtype=$dbc_default_dbtype
        fi
    fi

    ###
    ### dbtype-specific variable section
    ###
    dbc_default_basepath=""

    # now set some variables based on the dbtype
    dbc_db_installed_cmd="dbc_${dbc_dbtype}_db_installed"
    case $dbc_dbtype in
        mysql)
            . /usr/share/dbconfig-common/internal/mysql
            dbc_createuser_cmd='dbc_mysql_createuser'
            dbc_checkuser_cmd='dbc_mysql_check_user'
            dbc_createdb_cmd='dbc_mysql_createdb'
            dbc_dropdb_cmd='dbc_mysql_dropdb'
            dbc_dropuser_cmd='dbc_mysql_dropuser'
            dbc_sqlexec_cmd='dbc_mysql_exec_command'
            dbc_sqlfile_cmd='dbc_mysql_exec_file'
            dbc_dump_cmd='dbc_mysql_dump'
            dbc_register_templates="$dbc_standard_templates $dbc_mysql_templates"
            dbc_default_admin="root"
            dbc_default_dbuser=$(echo $dbc_package | tr -d +. | cut -c -16);
            dbc_default_port="3306"
            dbc_dbvendor="MySQL"
            dbc_dbpackage="mysql-server"
            dbc_dbclientpackage="mysql-client"
            ;;
        pgsql)
            . /usr/share/dbconfig-common/internal/pgsql
            dbc_createuser_cmd='dbc_pgsql_createuser'
            dbc_checkuser_cmd='dbc_pgsql_check_user'
            dbc_createdb_cmd='dbc_pgsql_createdb'
            dbc_dropdb_cmd='dbc_pgsql_dropdb'
            dbc_dropuser_cmd='dbc_pgsql_dropuser'
            dbc_sqlexec_cmd='dbc_pgsql_exec_command'
            dbc_sqlfile_cmd='dbc_pgsql_exec_file'
            dbc_dump_cmd='dbc_pgsql_dump'
            dbc_register_templates="$dbc_standard_templates $dbc_pgsql_templates"
            dbc_default_admin="postgres"
            dbc_default_dbuser=$(echo $dbc_package | tr -d +-.);
            dbc_use_dbuser="false"
            dbc_dbvendor="PostgreSQL"
            dbc_dbpackage="postgresql"
            dbc_dbclientpackage="postgresql-client"
            ;;
        sqlite|sqlite3)
            . /usr/share/dbconfig-common/internal/sqlite
            dbc_createuser_cmd=true
            dbc_checkuser_cmd=false
            dbc_createdb_cmd='dbc_sqlite_createdb'
            dbc_dropdb_cmd='dbc_sqlite_dropdb'
            dbc_dropuser_cmd=true
            dbc_sqlexec_cmd='dbc_sqlite_exec_command'
            dbc_sqlfile_cmd='dbc_sqlite_exec_file'
            dbc_dump_cmd='dbc_sqlite_dump'
            dbc_register_templates="$dbc_standard_templates $dbc_sqlite_templates"
            dbc_default_admin=""
            dbc_default_dbuser="";
            dbc_default_basepath="/var/lib/dbconfig-common/$dbc_dbtype/$dbc_package"
            dbc_use_dbuser="false"
            dbc_dbvendor="SQLite"
            dbc_sqlite_cmd="/usr/bin/$dbc_dbtype"
            dbc_dbpackage="$dbc_dbtype"
            dbc_dbclientpackage="$dbc_dbtype"
            ;;
        *)
            dbc_register_templates="$dbc_standard_templates $dbc_mysql_templates $dbc_pgsql_templates $dbc_sqlite_templates"
            ;;
    esac

    # but if this is a frontend-only app, reset some of the above to noops
    if [ "$dbc_frontend" ]; then
        dbc_createuser_cmd=true
        dbc_checkuser_cmd=false
        dbc_createdb_cmd=true
        dbc_dropdb_cmd=true
        dbc_dropuser_cmd=true
        dbc_sqlexec_cmd=true
        dbc_sqlfile_cmd=true
        dbc_dump_cmd=true
    fi
}


###
### functions
###

###
### dump global configuration to a config file
###
dbc_write_global_config(){
    local tfile
    _dbc_debug "dbc_write_global_config() $@"

    tfile=$(dbc_mktemp)
    cat << EOF > "$tfile"
# dbconfig-common system-wide configuration options

# dbc_remember_admin_pass: should we cache administrative passwords?
#	set to "true" to keep admin passwords cached in debconf
dbc_remember_admin_pass='$dbc_remember_admin_pass'

# dbc_remote_questions_default: will we be likely to install on remote servers?
#	set to "true" to raise the priority of debconf questions related to
#   database installation on remote servers (for database types that support this)
dbc_remote_questions_default='$dbc_remote_questions_default'

EOF
    ucf --debconf-ok "$tfile" "$dbc_globalconfig"
    ucfr dbconfig-common "$dbc_globalconfig"
    rm -f "$tfile"
}

dbc_read_package_config(){
    local _tmp_dbuser _tmp_basepath _tmp_dbname
    _dbc_debug "dbc_read_package_config() $@"
    _dbc_sanity_check package packageconfig || dbc_install_error || return $?
    [ "$dbc_tried_again" ] && return 0

    # first we set some defaults, which will be overridden by the config
    # This is the crucial place where things can go wrong when preseeding
    # on first install because dbc_install will just be set to true. Just
    # a note, preseeding on further reinstall/reconfigure doesn't make
    # sense, just edit the configuration files appropriately.
    # See bug 476946
    dbc_install=true
    dbc_upgrade=true

    if [ -f $dbc_packageconfig ]; then
        . $dbc_packageconfig
    else
        # If we are here, there was no previous dbc configuration file
        # found so I think we can trust debconf
        # Turns out we cannot fully... According to the documentation
        # package maintainers can provide several variables in their config.
        if [ "$dbc_dbuser" ] ; then _tmp_dbuser="$dbc_dbuser" ; fi
        if [ "$dbc_basepath" ] ; then _tmp_basepath="$dbc_basepath" ; fi
        if [ "$dbc_dbname" ] ; then _tmp_dbname="$dbc_dbname" ; fi
        dbc_read_package_debconf
        if [ ! "$dbc_dbuser" ] ; then dbc_dbuser="$_tmp_dbuser" ; fi
        if [ ! "$dbc_basepath" ] ; then dbc_basepath="$_tmp_basepath" ; fi
        if [ ! "$dbc_dbname" ] ; then dbc_dbname="$_tmp_dbname" ; fi
        # But let's just make sure we don't alter the debconf state, e.g.
        # for preseeded values that haven't been properly identified
        # No, we shouldn't as then the above values will not be preseeded
        #db_set $dbc_package/internal/skip-preseed true
    fi

    # This probably should go into dbc_read_package_debconf.
    if [ ! "$dbc_dballow" ] ; then
        # Fallback in case the dbc_dballow isn't determined yet
        # if dbserver is unset, that means localhost.
        if [ -z "$dbc_dbserver" ] || [ "$dbc_dbserver" = "localhost" ]; then
            # if the server is local, only allow connections from localhost
            dbc_dballow="localhost"
        else
            # otherwise, only tell the remote database to allow from us
            dbc_dballow=$(hostname -f)
        fi
    fi
}

###
### this function is responsible for setting all debconf values based
### on the contents of on-system config files, so that we can avoid
### the "Debconf is Not a Registry" dilemma.
###
dbc_preseed_package_debconf(){
    local skip_preseed tmp_dbtypes
    _dbc_debug "dbc_preseed_package_debconf() $@"
    _dbc_sanity_check package || dbc_install_error || return $?
    [ "$dbc_tried_again" ] && return 0

    # if we've pre-configured the package and are running config
    # for the second time via dpkg, then there is no on-disk
    # configuration to preseed with, and we would in fact nuke
    # the previous answers.  so we check to avoid that.
    db_get $dbc_package/internal/skip-preseed && skip_preseed="$RET"
    db_reset $dbc_package/internal/skip-preseed
    if [ "$skip_preseed" = "true" ]; then
        dbc_read_package_debconf
        return 0
    fi

    # set whether they want our help
    db_set $dbc_package/dbconfig-install "$dbc_install"
    db_set $dbc_package/dbconfig-upgrade "$dbc_upgrade"
    db_set $dbc_package/dbconfig-remove "$dbc_remove"

    # set the dbtype
    db_set $dbc_package/database-type "$dbc_dbtype"

    # the following db-specific settings always need to be preseeded unless
    # we specifically know we're not configuring for the given database type
    #
    # set the psql authentication method
    if [ -z "$dbc_dbtype" ] || [ "$dbc_dbtype" = "pgsql" ]; then
        if [ "$dbc_authmethod_admin" ]; then
            db_set $dbc_package/pgsql/authmethod-admin "$dbc_authmethod_admin"
        elif [ "$dbc_default_pgsql_authmethod_admin" ]; then
            db_set $dbc_package/pgsql/authmethod-admin "$dbc_default_pgsql_authmethod_admin"
        fi
        if [ "$dbc_authmethod_user" ]; then
            db_set $dbc_package/pgsql/authmethod-user "$dbc_authmethod_user"
        fi
    fi

    # for authenticated-only dbtypes.  also catches empty (multidb) type.
    if echo "$dbc_authenticated_dbtypes" | grep -q "$dbc_dbtype"; then
        # set app user
        if [ "$dbc_dbuser" ]; then
            db_set $dbc_package/db/app-user "$dbc_dbuser""@""$dbc_dballow"
        fi

        # In case dbc_dbtype is empty, we need to loop over all
        # authenticated_dbtypes. See LP: #252882
        if [ -z "$dbc_dbtype" ]; then
            tmp_dbtypes="$dbc_authenticated_dbtypes"
        else
            tmp_dbtypes="$dbc_dbtype"
        fi

        for tmp_dbtype in $tmp_dbtypes ; do

            # set the app user password
            if [ "$dbc_dbpass" ]; then
                db_set $dbc_package/$tmp_dbtype/app-pass "$dbc_dbpass"
            fi

            # set the database administrator name
            if [ "$dbc_dbadmin" ]; then
                db_set $dbc_package/$tmp_dbtype/admin-user "$dbc_dbadmin"
            fi

        done
    fi

    # for remote-capable dbtypes
    if echo "$dbc_remote_dbtypes" | grep -q "$dbc_dbtype"; then
        # set the remote server/port
        if [ "$dbc_dbserver" ]; then
            db_set $dbc_package/remote/host "$dbc_dbserver"
        fi
        if [ "$dbc_dbport" ]; then
            db_set $dbc_package/remote/port "$dbc_dbport"
        fi
    fi

    # for fs-based dbtypes only (sqlite)
    if echo "$dbc_fs_dbtypes" | grep -qa "$dbc_dbtype"; then
        # set the directory that the database file is found in
        if [ "$dbc_basepath" ]; then
            db_set $dbc_package/db/basepath "$dbc_basepath"
        fi
    fi

    # set the name of the database to be created
    if [ "$dbc_dbname" ]; then
        db_set $dbc_package/db/dbname "$dbc_dbname"
    fi

    case $dbc_dbtype in
        "pgsql")
            # peer/ident based auth doesn't need a password
            if [ "$dbc_authmethod_admin" != "ident" ]; then
                # set the database administrator pass
                db_set $dbc_package/pgsql/admin-pass "$dbc_dbadmpass"
            fi
            if [ "$dbc_authmethod_user" != "ident" ]; then
                # set the database user pass
                db_set $dbc_package/pgsql/app-pass "$dbc_dbpass"
            fi

            # set whether or not they want to force SSL
            if [ "$dbc_ssl" = "true" ]; then
                db_set $dbc_package/pgsql/method "TCP/IP + SSL"
            fi
            ;;
    esac
}


###
### this function is responsible for reading in everything
### with respect to the package's configuration and dbconfig-common.
###
dbc_read_package_debconf(){
    local tmp_dballow
    _dbc_debug "dbc_read_package_debconf() $@"
    _dbc_sanity_check package || dbc_install_error || return $?
    [ "$dbc_tried_again" ] && return 0

    # gracefully fetch this to support multi-dbtype packages
    # During initial installation dbc_dbtype may be empty after
    # this step if this is not preseeded.
    if [ ! "$dbc_hardcoded_dbtype" ]; then
        db_get $dbc_package/database-type && dbc_dbtype="$RET"
    fi
    # dbconfig needs to be reloaded at this point for multi-dbtype apps
    dbc_set_dbtype_defaults $dbc_dbtype

    # get whether they want our help with various stuff
    db_get $dbc_package/dbconfig-install && dbc_install="$RET"
    db_get $dbc_package/dbconfig-upgrade && dbc_upgrade="$RET"
    db_get $dbc_package/dbconfig-remove && dbc_remove="$RET"

    # If dbc_dbtype is not preseeded for multi-dbtype packages, we
    # assume that also the other db specific templates are not
    # preseeded. So, if dbc_dbtype is still empty here, we are going
    # to skip the items that depend on the dbtype. Note that the other
    # items are processed.
    if echo "$dbc_authenticated_dbtypes" | grep -q "$dbc_dbtype"; then
        # get app user; since dbc 1.8.50 we allow the admin to provide
        # the domain for the grant call. Unfortunately at least MySQL allows
        # the app-user to contain an at, so we need to be careful.
        db_get $dbc_package/db/app-user
        dbc_dbuser=$(echo "$RET" | sed 's/\(.*\)@\([^@]*\)/\1/')
        tmp_dballow=$(echo "$RET" | sed -e 's/^[^@]*$//' -e 's/.*@\([^@]*\)/\1/')
        if [ $tmp_dballow ] ; then
            dbc_dballow=$tmp_dballow
        fi

        if [ "$dbc_dbtype" ] ; then
            # get the app user password
            db_get $dbc_package/$dbc_dbtype/app-pass && dbc_dbpass="$RET"

            # get the database administrator name
            db_get $dbc_package/$dbc_dbtype/admin-user && dbc_dbadmin="$RET"

            # get the database administrator pass
            db_get $dbc_package/$dbc_dbtype/admin-pass && dbc_dbadmpass="$RET"
        fi
    fi

    if echo "$dbc_remote_dbtypes" | grep -q "$dbc_dbtype"; then

        # get the db server/port
        db_get $dbc_package/remote/host && dbc_dbserver="$RET"
        db_get $dbc_package/remote/port && dbc_dbport="$RET"

        # MySQL 5.7 doesn't support empty port anymore. Instead fill in the
        # default if no port was given or found. For other dbs, this may be
        # empty, effectively doing nothing here.
        if [ ! "$dbc_dbport" ] ; then
            dbc_dbport="$dbc_default_port"
        fi
    fi

    if echo "$dbc_fs_dbtypes" | grep -qa "$dbc_dbtype"; then
        # get the directory that the database file is found in
        db_get $dbc_package/db/basepath && dbc_basepath="$RET"
    fi

    # get the name of the database to be created
    db_get $dbc_package/db/dbname && dbc_dbname="$RET"

    # DEBIAN_FRONTEND=readline doesn't use our "preseeded" default (LP #689327)
    # similar code in dpkg/config but also checking for _tmp_dbname here to
    # prevent overwriting potential preseeded values of dbc_dbname
    if [ -z "$dbc_dbname" ] && [ -z "$_tmp_dbname" ]; then
        dbc_dbname=$(echo $dbc_package | tr -d +-.);
    fi

    # a few db-specific things
    case $dbc_dbtype in
        "pgsql")
            # get the psql authentication method
            db_get $dbc_package/pgsql/authmethod-admin && dbc_authmethod_admin="$RET"
            db_get $dbc_package/pgsql/authmethod-user && dbc_authmethod_user="$RET"

            # get whether or not they want to force SSL
            db_get $dbc_package/pgsql/method && dbc_method="$RET"
            if [ "$dbc_method" = "TCP/IP + SSL" ]; then
                dbc_ssl="true"
            fi
            ;;
        "mysql")
            # if the dbconfig-common consumer specifies a mysql authentication
            # plugin to be used, all users created through dbconfig-common, for
            # that consumer, will use the given authentication plugin.
            if [ ! "$dbc_authplugin" ]; then
                db_get $dbc_package/mysql/authplugin && dbc_authplugin="$RET"
            fi
            ;;
    esac

    if [ "$dbc_debug" ]; then
        _dbc_debug "settings determined from dbc_read_package_debconf:"
        _dbc_debug "\tdbc_install=$dbc_install"
        _dbc_debug "\tdbc_upgrade=$dbc_upgrade"
        _dbc_debug "\tdbc_remove=$dbc_remove"
        _dbc_debug "\tdbc_dbtype=$dbc_dbtype"
        _dbc_debug "\tdbc_dbuser=$dbc_dbuser"
        _dbc_debug "\tdbc_dbpass=$dbc_dbpass"
        _dbc_debug "\tdbc_dballow=$dbc_dballow"
        _dbc_debug "\tdbc_dbadmin=$dbc_dbadmin"
        _dbc_debug "\tdbc_dbadmpass=$dbc_dbadmpass"
        _dbc_debug "\tdbc_dbserver=$dbc_dbserver"
        _dbc_debug "\tdbc_dbport=$dbc_dbport"
        _dbc_debug "\tdbc_dbname=$dbc_dbname"
        _dbc_debug "\tdbc_authmethod_admin=$dbc_authmethod_admin"
        _dbc_debug "\tdbc_authmethod_user=$dbc_authmethod_user"
        _dbc_debug "\tdbc_ssl=$dbc_ssl"
    fi
}

###
### dump package configuration to a config file
###
dbc_write_package_config(){
    local iformat ofile tfile
    _dbc_debug "dbc_write_package_config() $@"
    _dbc_sanity_check packageconfig || dbc_install_error || return $?
    [ "$dbc_tried_again" ] && return 0
    echo "dbconfig-common: writing config to $dbc_packageconfig" >&2

    tfile=$(dbc_mktemp dbconfig-package-config.XXXXXX)

    # a quick check if this is a multi-dbtype app
    if [ "$dbc_hardcoded_dbtype" ]; then
        dbc_dbtype="$dbc_hardcoded_dbtype"
    fi
    # and a check for ssl
    if [ "$dbc_method" = "TCP/IP + SSL" ]; then
        dbc_ssl="true"
    fi

    cat << EOF > $tfile
# automatically generated by the maintainer scripts of $dbc_package
# any changes you make will be preserved, though your comments
# will be lost!  to change your settings you should edit this
# file and then run "dpkg-reconfigure $dbc_package"

# dbc_install: configure database with dbconfig-common?
#              set to anything but "true" to opt out of assistance
dbc_install='$(dbc_sq_escape $dbc_install)'

# dbc_upgrade: upgrade database with dbconfig-common?
#              set to anything but "true" to opt out of assistance
dbc_upgrade='$(dbc_sq_escape $dbc_upgrade)'

# dbc_remove: deconfigure database with dbconfig-common?
#             set to anything but "true" to opt out of assistance
dbc_remove='$(dbc_sq_escape $dbc_remove)'

# dbc_dbtype: type of underlying database to use
#	this exists primarily to let dbconfig-common know what database
#	type to use when a package supports multiple database types.
#	don't change this value unless you know for certain that this
#	package supports multiple database types
dbc_dbtype='$(dbc_sq_escape $dbc_dbtype)'

# dbc_dbuser: database user
#	the name of the user who we will use to connect to the database.
dbc_dbuser='$(dbc_sq_escape $dbc_dbuser)'

# dbc_dbpass: database user password
#	the password to use with the above username when connecting
#	to a database, if one is required
dbc_dbpass='$(dbc_sq_escape $dbc_dbpass)'

# dbc_dballow: allowed host to connect from
#       only for database types that support specifying the host from
#       which the database user is allowed to connect from
#       this string defines for which host the dbc_dbuser is allowed
#       to connect
#       this value is only really used again when you reconfigure the
#       package
dbc_dballow='$(dbc_sq_escape $dbc_dballow)'

# dbc_dbserver: database host.
#	leave unset to use localhost (or a more efficient local method
#	if it exists).
dbc_dbserver='$(dbc_sq_escape $dbc_dbserver)'

# dbc_dbport: remote database port
#	leave unset to use the default.  only applicable if you are
#	using a remote database.
dbc_dbport='$(dbc_sq_escape $dbc_dbport)'

# dbc_dbname: name of database
#	this is the name of your application's database.
dbc_dbname='$(dbc_sq_escape $dbc_dbname)'

# dbc_dbadmin: name of the administrative user
#	this is the administrative user that is used to create all of the above
#	The exception is the MySQL/MariaDB localhost case, where this value is
#	ignored and instead is determined from /etc/mysql/debian.cnf.
dbc_dbadmin='$(dbc_sq_escape $dbc_dbadmin)'

# dbc_basepath: base directory to hold database files
#	leave unset to use the default.  only applicable if you are
#	using a local (filesystem based) database.
dbc_basepath='$(dbc_sq_escape $dbc_basepath)'

##
## postgresql specific settings.  if you don't use postgresql,
## you can safely ignore all of these
##

# dbc_ssl: should we require ssl?
#	set to "true" to require that connections use ssl
dbc_ssl='$(dbc_sq_escape $dbc_ssl)'

# dbc_authmethod_admin: authentication method for admin
# dbc_authmethod_user: authentication method for dbuser
#	see the section titled "AUTHENTICATION METHODS" in
#	/usr/share/doc/dbconfig-common/README.pgsql for more info
dbc_authmethod_admin='$(dbc_sq_escape $dbc_authmethod_admin)'
dbc_authmethod_user='$(dbc_sq_escape $dbc_authmethod_user)'

##
## end postgresql specific settings
##

EOF
    # apps registered via webapps-common might use nested directories, so
    # we should make sure the directories exist
    mkdir -p "$(dirname "$dbc_packageconfig")"
    ucf --debconf-ok "$tfile" "$dbc_packageconfig"
    ucfr "$dbc_package" "$dbc_packageconfig"
    rm -f "$tfile"
    # generate the requested d-g-i config files unless it's a manual install
    # and we've been explicitly told to avoid doing this
    if [ "$dbc_install" != "true" ] && [ "$dbc_dgi_on_manual" != "true" ]; then
        return 0
    elif [ "$dbc_generate_include" ]; then
        if echo $dbc_generate_include | grep -q -E "^[^:]*:"; then
            iformat=$(echo $dbc_generate_include | cut -d: -f1)
            ofile=$(echo $dbc_generate_include | cut -d: -f2)

            # Changing the owner and perms should only be done during installation,
            # as administrator changes to configuration files must be respected.
            # Therefor, only processing owner and perms items when the target
            # file does not exist. This also works correctly when the configuration
            # file is removed alltogether, as ucf won't create the file.
            # This change can be done with all the Oct 2014 usage of dbconfig-common
            # (Checked with http://codesearch.debian.net), as long as no package
            # starts asking for the ownership or permissions and expects it to be
            # changed.
            # See BTS: #720517
            if [ ! -e "$ofile" ]; then
                if [ "$dbc_generate_include_owner" ]; then
                    dbc_generate_include_args="$dbc_generate_include_args -O $dbc_generate_include_owner"
                fi
                if [ "$dbc_generate_include_perms" ]; then
                    dbc_generate_include_args="$dbc_generate_include_args -m $dbc_generate_include_perms"
                fi
            fi

            dbconfig-generate-include -a -f "$iformat" $dbc_generate_include_args -U "$dbc_packageconfig" "$ofile"
            ucfr "$dbc_package" "$dbc_packageconfig"
        else
            dbc_error="maintainer did not properly set dbc_generate_include"
            dbc_install_error "writing package config" || return $?
            [ "$dbc_tried_again" ] && return 0
        fi
    fi
}


dbc_abort(){
    # forget that we've seen all the debconf questions
    for f in $dbc_register_templates; do
        db_fset $dbc_package/$f seen false
    done

    echo "dbconfig-common: $dbc_package $dbc_command: aborted." >&2
    dbc_postinst_cleanup
    return 1
}


##
## what to do if mysql-server etc are not installed
##
dbc_missing_db_package_error(){
    local question
    echo "warning: database package not installed?" >&2
    question="$dbc_package/missing-db-package-error"
    db_subst $question dbpackage $1
    dbc_retry_after_error=missing_db_package
    _dbc_recover_error || return $?
}

##
## what to do when something goes wrong during install
##
dbc_install_error(){
    local question
    echo "error encountered $1:" >&2
    echo $dbc_error >&2
    question="$dbc_package/install-error"
    db_subst $question error $dbc_error
    dbc_retry_after_error=install
    _dbc_recover_error || return $?
}

##
## what to do when something goes wrong during upgrade
##
dbc_upgrade_error(){
    local question
    echo "error encountered $1:" >&2
    echo $dbc_error >&2
    question="$dbc_package/upgrade-error"
    db_subst $question error $dbc_error
    db_subst $question dbfile $dbc_dumpfile
    dbc_retry_after_error=upgrade
    _dbc_recover_error || return $?
}

##
## what to do when something goes wrong during remove
##
dbc_remove_error(){
    local question
    echo "error encountered $1:" >&2
    echo $dbc_error >&2
    question="$dbc_package/remove-error"
    db_subst $question error $dbc_error
    dbc_retry_after_error=remove
    _dbc_recover_error || return $?
}

#
# Generic code called by dbc_*_error
#
_dbc_recover_error(){
    local _debian_frontend
    if [ "$_dbc_no_act" ]; then
        return 0;
    fi
    # Several actions set _dbc_asuser before calling the functions that can
    # cause the error to occur, so we need to make sure it is unset to start
    # with for the retry options.
    if [ "${_dbc_asuser:-}" ] ; then
        _dbc_asuser=""
    fi
    
    db_fset $question seen false
    db_input $dbc_prio_critical $question || true
    db_go || true
    db_get $question
    _dbc_on_error_option="$RET"

    if [ "$dbc_retry_after_error" != "upgrade" ] ; then
        # It seems $DEBIAN_FRONTEND is sometimes spelled Noninteractive
        # see LP: #1406700
        _debian_frontend="$(echo ${DEBIAN_FRONTEND:-} | tr '[:upper:]' '[:lower:]')"
        if [ "$_debian_frontend" = "noninteractive" ]; then
            echo "dbconfig-common: $dbc_package $dbc_command: noninteractive fail." >&2
            _dbc_on_error_option="ignore"
        fi
    fi

    if [ "$_dbc_on_error_option" = "abort" ]; then
        dbc_abort || return $?
    fi

    if [ "$_dbc_on_error_option" = "retry" ]; then
        # forget that we've seen all the debconf questions
        for f in $dbc_register_templates; do
            db_fset $dbc_package/$f seen false
        done
        echo "dbconfig-common: $dbc_package $dbc_command: trying again." >&2
        . /usr/share/dbconfig-common/dpkg/config
        dbc_go $dbc_package $dbc_command $dbc_oldversion || return $?
        # remove errors shouldn't call postinst
        if [ "$dbc_retry_after_error" != "remove" ] ; then
            . /usr/share/dbconfig-common/dpkg/postinst
        else
            . /usr/share/dbconfig-common/dpkg/prerm
        fi
        dbc_go $dbc_package $dbc_command $dbc_oldversion || return $?
        dbc_tried_again="yes"
    fi

    if [ "$_dbc_on_error_option" = "retry (skip questions)" ]; then
        echo "dbconfig-common: $dbc_package $dbc_command: trying again (skip questions)." >&2
        # remove errors shouldn't call postinst
        if [ "$dbc_retry_after_error" != "remove" ] ; then
            . /usr/share/dbconfig-common/dpkg/postinst
        else
            . /usr/share/dbconfig-common/dpkg/prerm
        fi
        dbc_go $dbc_package $dbc_command $dbc_oldversion || return $?
        dbc_tried_again="yes"
    fi

    if [ "$_dbc_on_error_option" = "ignore" ]; then
        echo "dbconfig-common: $dbc_package $dbc_command: ignoring errors from here forwards" 2>&1
        # XXX this would be better
        _dbc_no_act="true"
        dbc_checkuser_cmd=true
        dbc_createdb_cmd=true
        dbc_createuser_cmd=true
        dbc_dbvendor=true
        dbc_default_admin=true
        dbc_default_dbuser=true
        dbc_dropdb_cmd=true
        dbc_dropuser_cmd=true
        dbc_dump_cmd=true
        dbc_register_templates=""
        dbc_sqlexec_cmd=true
        dbc_sqlfile_cmd=true
        dbc_use_dbuser=true
        return 0
    fi
}

##
## exactly what you'd think
##
dbc_forget_dbadmin_password(){
    _dbc_debug "dbc_forget_dbadmin_password() $@"
    echo dbconfig-common: flushing administrative password >&2
    db_reset $dbc_package/$dbc_dbtype/admin-pass || true
    db_fset $dbc_package/$dbc_dbtype/admin-pass seen false || true
    db_reset $dbc_package/password-confirm || true
    db_fset $dbc_package/password-confirm seen false || true
}

##
## exactly what you'd think
##
dbc_forget_app_password(){
    _dbc_debug "dbc_forget_app_password() $@"
    db_reset $dbc_package/$dbc_dbtype/app-pass || true
    db_fset $dbc_package/$dbc_dbtype/app-pass seen false || true
    db_reset $dbc_package/app-password-confirm || true
    db_fset $dbc_package/app-password-confirm seen false || true
}

##
## exactly what you'd think
##
##	usage: dbc_get_admin_pass package dbtype
##
dbc_get_admin_pass(){
    local have_admin_pass pass1 _tmp_dbadmin
    _dbc_debug "dbc_get_admin_pass() $@"

    # Frontends don't need the admin password as they don't put anything in the
    # database.
    if [ "$dbc_frontend" ]; then
        return 0
    fi

    # Non-authenticated dbtypes aren't using passwords.
    if echo "$dbc_authenticated_dbtypes" | grep -qv "$dbc_dbtype"; then
        return 0
    fi
    
    # (PostgreSQL) peer/ident doesn't need the admin password.
    if [ "$dbc_authmethod_admin" = "ident" ]; then
        return 0
    fi
    
    db_fget $dbc_package/$dbc_dbtype/admin-pass seen
    if [ "$RET" = "true" ]; then
        have_admin_pass="yes"
    fi

    # make sure the passwords are the same, safely
    while [ ! "$have_admin_pass" ]; do
        # To prevent mistakes where people forgot which admin-user they used
        # let's put the account name into the template.
        db_get $dbc_package/$dbc_dbtype/admin-user && _tmp_dbadmin="$RET"
        db_subst $dbc_package/$dbc_dbtype/admin-pass dbadmin "$_tmp_dbadmin"
        # get the administrative password
        db_input $dbc_prio_high $dbc_package/$dbc_dbtype/admin-pass || true
        if [ $dbc_statefull ] ; then
            db_go || return $?
        else
            db_go || true
        fi
        db_get $dbc_package/$dbc_dbtype/admin-pass
        pass1="$RET"

        if [ "$dbc_dbtype" = "pgsql" ] && [ ! "$pass1" ]; then
            db_input $dbc_prio_high $dbc_package/pgsql/no-empty-passwords || true
            db_reset $dbc_package/$dbc_dbtype/admin-pass
            db_fset $dbc_package/$dbc_dbtype/admin-pass seen false
            if [ $dbc_statefull ] ; then
                db_go || return $?
            else
                db_go || true
            fi
        else
            have_admin_pass="yes"
        fi
    done

    db_get $dbc_package/$dbc_dbtype/admin-pass
    dbc_dbadmpass="$RET"
}

##
## exactly what you'd think
##
##	usage: dbc_get_app_pass package dbtype
##
dbc_get_app_pass(){
    local have_app_pass pass1 pass2
    _dbc_debug "dbc_get_app_pass() $@"

    db_fget $dbc_package/$dbc_dbtype/app-pass seen
    if [ "$RET" = "true" ]; then
        have_app_pass="yes"
        db_get $dbc_package/$dbc_dbtype/app-pass
        dbc_dbpass="$RET"
    fi

    # make sure the passwords are the same, safely
    while [ ! "$have_app_pass" ]; do
        # forget the password-confirm question first, as it's shared
        db_reset $dbc_package/app-password-confirm
        db_fset $dbc_package/app-password-confirm seen false

        # get the appistrative password
        # do we really want/need prio high (maybe prio_remote_question)
        # same prio as below
        db_input $dbc_prio_high $dbc_package/$dbc_dbtype/app-pass || true
        if [ $dbc_statefull ] ; then
            db_go || return $?
        else
            db_go || true
        fi
        db_get $dbc_package/$dbc_dbtype/app-pass
        pass1="$RET"

        # get the password again, if it is not empty
        if [ "$pass1" ]; then
            # do we really want/need prio high (maybe prio_remote_question)
            # same prio as above
            db_input $dbc_prio_high $dbc_package/app-password-confirm || true
            if [ $dbc_statefull ] ; then
                db_go || return $?
            else
                db_go || true
            fi
            db_get $dbc_package/app-password-confirm
            pass2="$RET"
        fi

        # test to see if the passwords match
        if [ "$pass1" = "$pass2" ]; then
            dbc_dbpass="$pass1"
            have_app_pass="yes"
        else
            # tell them the passwords didn't match, loop again
            db_reset $dbc_package/$dbc_dbtype/app-pass
            db_fset $dbc_package/$dbc_dbtype/app-pass seen false
            db_input $dbc_prio_high $dbc_package/passwords-do-not-match || true
            if [ $dbc_statefull ] ; then
                db_go || return $?
            else
                db_go || true
            fi
        fi
    done

    if [ ! "$dbc_dbpass" ]; then
        dbc_dbpass=$(env LANG=C LC_ALL=C tr -dc "[:alnum:]" < /dev/urandom | dd bs=1 count=12 2>/dev/null)
        db_set $dbc_package/$dbc_dbtype/app-pass "$dbc_dbpass"
        db_set $dbc_package/app-password-confirm "$dbc_dbpass"
    fi
}

##
## perform any necessary cleanup before exiting the postinst
##
dbc_postinst_cleanup(){
    _dbc_debug "dbc_postinst_cleanup() $@"
    if echo "$dbc_authenticated_dbtypes" | grep -q "$dbc_dbtype"; then
        if [ "$dbc_remember_admin_pass" != "true" ]; then
            dbc_forget_dbadmin_password
        fi
        if [ "$dbc_remember_app_pass" != "true" ]; then
            dbc_forget_app_password
        fi
    fi
    db_reset $dbc_package/internal/skip-preseed
    db_reset $dbc_package/internal/reconfiguring
}

##
## determine whether a db is supported by a package
##
dbc_detect_supported_dbtype(){
    local query_dbtype
    _dbc_debug "dbc_detect_supported_dbtype() $@"
    query_dbtype=$1
    # see if the package says it's supported
    if echo $dbc_dbtypes | grep -qE "(^|,[[:space:]]*)$query_dbtype(\$|,)"; then
        return 0
    fi
    return 1
}

##
## determine whether a db is installed on the system
##
dbc_detect_installed_dbtype(){
    _dbc_debug "dbc_detect_installed_dbtype() $@"
    _dbc_detect_installed_dbtype "$@"
}

###
### register all the necessary debconf templates
###
dbc_register_debconf(){
    local f local
    _dbc_debug "dbc_register_debconf() $@"

    for f in $dbc_register_templates; do
        # register the question, but bail if it doesn't (yet) exist
        # failure is gracefully handled elsewhere
        if ! db_register dbconfig-common/$f $dbc_package/$f >/dev/null 2>&1; then
            return 1
        fi
        # perform some basic customizing substitutions
        if [ "$dbc_packagetitle" ]; then
            db_subst $dbc_package/$f pkg $dbc_packagetitle
        else
            db_subst $dbc_package/$f pkg $dbc_package
        fi
        if [ "$dbc_dbvendor" ]; then
            db_subst $dbc_package/$f dbvendor $dbc_dbvendor
        fi
    done
    if [ "$dbc_dbtypes" ]; then
        db_subst $dbc_package/database-type database_types $dbc_dbtypes
    fi
}

###
### dbc_sq_escape: escape any single quotes present in a string
###
###	this will safely escape a string which is to be stored inside
### single quotes.  that is  as'df -> as'\''df
###
dbc_sq_escape(){
    sed -e "s,','\\\\'',g" << EOF
$@
EOF
}

###
### dbc_no_thanks: check if dbconfig-no-thanks is (going to be) installed
###
### dbconfig-no-thanks is meant to allow opting out of dbc help. However,
### according to policy 3.9.1 the maintainer scripts may be called before the
### package is unpacked, so we can't just check for files.
###
dbc_no_thanks(){
    local no_thanks_status

    # db:Status-Want requires dpkg 1.17.11
    no_thanks_status=$(dpkg-query -W -f='${db:Status-Want}' dbconfig-no-thanks 2>/dev/null)

    if [ "${no_thanks_status}" = install ] || [ "${no_thanks_status}" = hold ] ; then
        _dbc_debug "dbconfig-no-thanks is installed. Nothing to do for dbconfig-common."
        return 0
    else
        return 1
    fi
}

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