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fb7c1b9415
when detecting running mysqld processes to stop, ignore processes in different namespaces.
212 lines
6.4 KiB
Bash
212 lines
6.4 KiB
Bash
#!/bin/bash -e
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#
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# summary of how this script can be called:
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# * <new-preinst> install
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# * <new-preinst> install <old-version>
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# * <new-preinst> upgrade <old-version>
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# * <old-preinst> abort-upgrade <new-version>
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#
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. /usr/share/debconf/confmodule
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if [ -n "$DEBIAN_SCRIPT_DEBUG" ]; then set -v -x; DEBIAN_SCRIPT_TRACE=1; fi
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${DEBIAN_SCRIPT_TRACE:+ echo "#42#DEBUG# RUNNING $0 $*" 1>&2 }
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export PATH=$PATH:/sbin:/usr/sbin:/bin:/usr/bin
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MYADMIN="/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf"
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mysql_datadir=/var/lib/mysql
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mysql_upgradedir=/var/lib/mysql-upgrade
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# Try to stop the server in a sane way. If it does not success let the admin
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# do it himself. No database directories should be removed while the server
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# is running! Another mysqld in e.g. a different chroot is fine for us.
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stop_server() {
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if [ ! -x /etc/init.d/mysql ]; then return; fi
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# Return immediately if there are no mysql processes running
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# as there is no point in trying to shutdown in that case.
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if ! pgrep --ns $$ mysqld > /dev/null; then return; fi
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set +e
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if [ -x /usr/sbin/invoke-rc.d ]; then
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cmd="invoke-rc.d mysql stop"
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else
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cmd="/etc/init.d/mysql stop"
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fi
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$cmd
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errno=$?
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set -e
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# 0=ok, 100=no init script (fresh install)
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if [ "$errno" != 0 -a "$errno" != 100 ]; then
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echo "${cmd/ */} returned $errno" 1>&2
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echo "There is a MySQL server running, but we failed in our attempts to stop it." 1>&2
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echo "Stop it yourself and try again!" 1>&2
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db_stop
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exit 1
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fi
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}
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################################ main() ##########################
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this_version=10.2
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max_upgradeable_version=5.7
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# Check if a flag file is found that indicates a previous MariaDB or MySQL
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# version was installed. If multiple flags are found, check which one was
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# the biggest version number.
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for flag in $mysql_datadir/debian-*.flag
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do
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# The for loop leaves $flag as the query string if there are no results,
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# so the check below is needed to stop further processing when there are
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# no real results.
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if [ $flag = "$mysql_datadir/debian-*.flag" ]
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then
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break
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fi
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flag_version=`echo $flag | sed 's/.*debian-\([0-9\.]\+\).flag/\1/'`
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# Initialize value if empty
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if [ -z "$found_version" ]
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then
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found_version=$flag_version
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fi
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# Update value if now bigger then before
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if dpkg --compare-versions "$flag_version" '>>' "$found_version"
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then
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found_version=$flag_version
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fi
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done
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# If an upgrade is detected, proceed with it automatically without
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# requiring any user interaction.
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#
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# However, if the user attempts to downgrade, warn about the incompatibility.
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# Downgrade is detected if the flag version is bigger than $this_version
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# (e.g. 10.1 > 10.0) or the flag version is smaller than 10.0 but bigger
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# than $max_upgradeable_version.
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if [ ! -z "$found_version" ]
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then
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echo "$mysql_datadir: found previous version $found_version"
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if dpkg --compare-versions "$found_version" '>>' "$this_version"
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then
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downgrade_detected=true
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fi
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if dpkg --compare-versions "$found_version" '>>' "$max_upgradeable_version" \
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&& dpkg --compare-versions "$found_version" '<<' "10.0"
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then
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downgrade_detected=true
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fi
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fi
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# Don't abort dpkg if downgrade is detected (as was done previously).
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# Instead simply move the old datadir and create a new for this_version.
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if [ ! -z "$downgrade_detected" ]
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then
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db_input critical mariadb-server-10.2/old_data_directory_saved || true
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db_go
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echo "The file $mysql_datadir/debian-$found_version.flag indicates a" 1>&2
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echo "version that cannot automatically be upgraded. Therefore the" 1>&2
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echo "previous data directory will be renamed to $mysql_datadir-$found_version and" 1>&2
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echo "a new data directory will be initialized at $mysql_datadir." 1>&2
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echo "Please manually export/import your data (e.g. with mysqldump) if needed." 1>&2
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mv -f $mysql_datadir $mysql_datadir-$found_version
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# Also move away the old debian.cnf file that included credentials that are
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# no longer valid
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mv -f /etc/mysql/debian.cnf /etc/mysql/debian.cnf-$found_version
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fi
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# to be sure
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stop_server
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# If we use NIS then errors should be tolerated. It's up to the
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# user to ensure that the mysql user is correctly setup.
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# Beware that there are two ypwhich one of them needs the 2>/dev/null!
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if test -n "`which ypwhich 2>/dev/null`" && ypwhich >/dev/null 2>&1; then
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set +e
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fi
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#
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# Now we have to ensure the following state:
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# /etc/passwd: mysql:x:100:101:MySQL Server:/nonexistent:/bin/false
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# /etc/group: mysql:x:101:
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#
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# Sadly there could any state be present on the system so we have to
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# modify everything carefully i.e. not doing a chown before creating
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# the user etc...
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#
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# creating mysql group if he isn't already there
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if ! getent group mysql >/dev/null; then
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# Adding system group: mysql.
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addgroup --system mysql >/dev/null
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fi
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# creating mysql user if he isn't already there
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if ! getent passwd mysql >/dev/null; then
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# Adding system user: mysql.
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adduser \
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--system \
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--disabled-login \
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--ingroup mysql \
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--no-create-home \
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--home /nonexistent \
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--gecos "MySQL Server" \
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--shell /bin/false \
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mysql >/dev/null
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fi
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# end of NIS tolerance zone
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set -e
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# if there's a symlink, let's store where it's pointing, because otherwise
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# it's going to be lost in some situations
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for dir in DATADIR LOGDIR; do
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checkdir=`eval echo "$"$dir`
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if [ -L "$checkdir" ]; then
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mkdir -p "$mysql_upgradedir"
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cp -dT "$checkdir" "$mysql_upgradedir/$dir.link"
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fi
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done
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# creating mysql home directory
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if [ ! -d $mysql_datadir -a ! -L $mysql_datadir ]; then
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mkdir $mysql_datadir
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fi
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# checking disc space
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if LC_ALL=C BLOCKSIZE= df --portability $mysql_datadir/. | tail -n 1 | awk '{ exit ($4>1000) }'; then
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echo "ERROR: There's not enough space in $mysql_datadir/" 1>&2
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db_stop
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exit 1
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fi
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# Since the home directory was created before putting the user into
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# the mysql group and moreover we cannot guarantee that the
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# permissions were correctly *before* calling this script, we fix them now.
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# In case we use NIS and no mysql user is present then this script should
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# better fail now than later..
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# The "set +e" is necessary as e.g. a ".journal" of a ext3 partition is
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# not chgrp'able (#318435).
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set +e
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find $mysql_datadir ! -uid $(id -u mysql) -print0 | xargs -0 -r chown mysql
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find $mysql_datadir -follow -not -group mysql -print0 2>/dev/null \
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| xargs -0 --no-run-if-empty chgrp mysql
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set -e
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db_stop
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#DEBHELPER#
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exit 0
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