diff options
Diffstat (limited to 'debian/mariadb-server.preinst')
| -rw-r--r-- | debian/mariadb-server.preinst | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/debian/mariadb-server.preinst b/debian/mariadb-server.preinst new file mode 100644 index 00000000..69af22f9 --- /dev/null +++ b/debian/mariadb-server.preinst @@ -0,0 +1,288 @@ +#!/bin/bash -e +# +# summary of how this script can be called: +# * <new-preinst> install +# * <new-preinst> install <old-version> +# * <new-preinst> upgrade <old-version> +# * <old-preinst> abort-upgrade <new-version> +# + +# shellcheck source=/dev/null +. /usr/share/debconf/confmodule + +# Just kill the invalid insserv.conf.d directory without fallback +if [ -d "/etc/insserv.conf.d/mariadb/" ] +then + rm -rf "/etc/insserv.conf.d/mariadb/" +fi + +if [ -n "$DEBIAN_SCRIPT_DEBUG" ] +then + set -v -x + DEBIAN_SCRIPT_TRACE=1 +fi +${DEBIAN_SCRIPT_TRACE:+ echo "#42#DEBUG# RUNNING $0 $*" 1>&2 } + +export PATH=$PATH:/sbin:/usr/sbin:/bin:/usr/bin +mysql_datadir=/var/lib/mysql +mysql_upgradedir=/var/lib/mysql-upgrade + +MARIADBD_USERS="root" + +# Check if user 'mysql' exists before referring to it in pgrep +# to avoid pgrep erroring on 'invalid user name' +if id mysql >/dev/null 2>&1 +then + MARIADBD_USERS="$MARIADBD_USERS,mysql" +fi + +# Try to stop the server in a sane way. If it does not success let the admin +# do it himself. No database directories should be removed while the server +# is running! Another mariadbd in e.g. a different chroot is fine for us. +stop_server() { + # Return immediately if there are no mysqld processes running on a host + # (leave containerized processes with the same name in other namespaces) + # as there is no point in trying to shutdown in that case. + if ! pgrep -x -u "$MARIADBD_USERS" --nslist pid --ns $$ "mysqld|mariadbd" > /dev/null + then + return + fi + + set +e + invoke-rc.d mariadb stop + invoke-rc.d mysql stop # Backwards compatibility + errno=$? + set -e + + # systemctl could emit exit code 100=no init script (fresh install) + if [ "$errno" != 0 ] && [ "$errno" != 100 ] + then + echo "Attempt to stop MariaDB/MySQL server returned exitcode $errno" 1>&2 + echo "There is a MariaDB/MySQL server running, but we failed in our attempts to stop it." 1>&2 + echo "Stop it yourself and try again!" 1>&2 + db_stop + exit 1 + fi +} + +################################ main() ########################## + +# @TODO: Rewrite this to use the new upstream /var/lib/mysql_upgrade_info file +# instead of the legacy /var/lib/debian-XX.X.flag file +this_version=__MARIADB_MAJOR_VER__ +max_upgradeable_version=5.7 + +# Check if a flag file is found that indicates a previous MariaDB or MySQL +# version was installed. If multiple flags are found, check which one was +# the biggest version number. +for flag in "$mysql_datadir"/debian-*.flag +do + + # The for loop leaves $flag as the query string if there are no results, + # so the check below is needed to stop further processing when there are + # no real results. + if [ "$flag" = "$mysql_datadir/debian-*.flag" ] + then + break + fi + + # The whole flag_version thing should be rewritten, so ignore minor Shellcheck + # nag for now + # shellcheck disable=SC2001 + flag_version=$(echo "$flag" | sed 's/.*debian-\([0-9\.]\+\).flag/\1/') + + # Initialize value if empty + if [ -z "$found_version" ] + then + found_version=$flag_version + fi + + # Update value if now bigger then before + if dpkg --compare-versions "$flag_version" '>>' "$found_version" + then + found_version=$flag_version + fi + +done + + +# If an upgrade is detected, proceed with it automatically without +# requiring any user interaction. +# +# However, if the user attempts to downgrade, warn about the incompatibility. +# Downgrade is detected if the flag version is bigger than $this_version +# (e.g. 10.1 > 10.0) or the flag version is smaller than 10.0 but bigger +# than $max_upgradeable_version. +if [ -n "$found_version" ] +then + + # MySQL 8.0 in Ubuntu has a bug in packaging and the file is name wrongly + # 'debian-5.7.flag', so in case '5.7' was encountered an extra check needs to + # be done to see is there is a file called undo_001, which is a sign of 8.0. + if [ "$found_version" == "5.7" ] && [ -f "$mysql_datadir/undo_001" ] + then + # Seems to be a 8.0, flag has wrongly 5.7 (know bug) + found_version=8.0 + fi + + echo "$mysql_datadir: found previous version $found_version" + + if dpkg --compare-versions "$found_version" '>>' "$this_version" + then + downgrade_detected=true + fi + + if dpkg --compare-versions "$found_version" '>>' "$max_upgradeable_version" \ + && dpkg --compare-versions "$found_version" '<<' "10.0" + then + downgrade_detected=true + fi + +fi + +# If there is no debian-*.flag, and no version was detected, but a file that +# indicated MySQL 8.0 is found (undo_001 is created by default in MySQL 8.0+ +# installs), then that file is enough of additional indication to trigger the +# move of the data directory. +if [ -z "$found_version" ] && + [ -z "$(find $mysql_datadir/debian-*.flag 2> /dev/null)" ] && + [ -f "$mysql_datadir/undo_001" ] +then + echo "$mysql_datadir: no server version flag found, assuming MySQL 8.0 data encountered" + downgrade_detected=true + found_version="previous" # Just use dummy name as we don't know real version +fi + +# Don't abort dpkg if downgrade is detected (as was done previously). +# Instead simply move the old datadir and create a new for this_version. +if [ -n "$downgrade_detected" ] +then + db_input critical "mariadb-server/old_data_directory_saved" || true + db_go + echo "The file $mysql_datadir/debian-$found_version.flag indicates a" 1>&2 + echo "version that cannot automatically be upgraded. Therefore the" 1>&2 + echo "previous data directory will be renamed to $mysql_datadir-$found_version and" 1>&2 + echo "a new data directory will be initialized at $mysql_datadir." 1>&2 + echo "Please manually export/import your data (e.g. with mysqldump) if needed." 1>&2 + mv -f "$mysql_datadir" "$mysql_datadir-$found_version" + # Also move away the old debian.cnf file that included credentials that are + # no longer valid. If none existed, ignore error and let dpkg continue. + mv -f /etc/mysql/debian.cnf "/etc/mysql/debian.cnf-$found_version" || true +fi + +# to be sure +stop_server + +# If we use NIS then errors should be tolerated. It's up to the +# user to ensure that the mysql user is correctly setup. +# Beware that there are two ypwhich one of them needs the 2>/dev/null! +if test -n "$(command -v ypwhich 2>/dev/null)" && ypwhich > /dev/null 2>&1 +then + set +e +fi + +# +# Now we have to ensure the following state: +# /etc/passwd: mysql:x:100:101:MariaDB Server:/nonexistent:/bin/false +# /etc/group: mysql:x:101: +# +# Sadly there could any state be present on the system so we have to +# modify everything carefully i.e. not doing a chown before creating +# the user etc... +# + +# creating mysql group if he isn't already there +if ! getent group mysql >/dev/null +then + # Adding system group: mysql. + addgroup --system mysql >/dev/null +fi + +# creating mysql user if he isn't already there +if ! getent passwd mysql >/dev/null +then + # Adding system user: mysql. + adduser \ + --system \ + --disabled-login \ + --ingroup mysql \ + --no-create-home \ + --home /nonexistent \ + --gecos "MariaDB Server" \ + --shell /bin/false \ + mysql >/dev/null 2>&1 +fi + +# end of NIS tolerance zone +set -e + +# if there's a symlink, let's store where it's pointing, because otherwise +# it's going to be lost in some situations +for dir in DATADIR LOGDIR +do + checkdir=$(eval echo "$"$dir) + if [ -L "$checkdir" ] + then + # Use mkdir option 'Z' to create with correct SELinux context. + mkdir -pZ "$mysql_upgradedir" + cp -dT "$checkdir" "$mysql_upgradedir/$dir.link" + fi +done + +# creating mysql home directory +if [ ! -d $mysql_datadir ] && [ ! -L $mysql_datadir ] +then + # Use mkdir option 'Z' to create with correct SELinux context. + mkdir -Z $mysql_datadir +fi + +# As preset blocksize of GNU df is 1024 then available bytes is $df_available_blocks * 1024 +# 4096 blocks is then lower than 4 MB +df_available_blocks="$(LC_ALL=C BLOCKSIZE='' df --output=avail "$mysql_datadir" | tail -n 1)" +if [ "$df_available_blocks" -lt "4096" ] +then + echo "ERROR: There's not enough space in $mysql_datadir/" 1>&2 + db_stop + exit 1 +fi + +# Since the home directory was created before putting the user into +# the mysql group and moreover we cannot guarantee that the +# permissions were correctly *before* calling this script, we fix them now. +# In case we use NIS and no mysql user is present then this script should +# better fail now than later.. +# The "set +e" is necessary as e.g. a ".journal" of a ext3 partition is +# not chgrp'able (#318435). +set +e +find $mysql_datadir ! -uid "$(id -u mysql)" -print0 | xargs -0 -r chown mysql +find $mysql_datadir -follow -not -group mysql -print0 2>/dev/null \ + | xargs -0 --no-run-if-empty chgrp mysql +set -e + +db_stop + +#DEBHELPER# + +# dh_installinit/13.11.3 adds this check but only with 'install', so we need to +# have and extra one to check 'upgrade'. This ensures that upgrades from +# mariadb-server-x.y to mariadb-server (without version suffix) ends up with +# the executable bit set on /etc/init.d/mariadb, which otherwise would end up +# disabled due to the mariadb-server-x.y.postrm being triggered. +# $1 = upgrade +# $2 = 1:10.6.11-2 +if [ "$1" = "upgrade" ] && [ -n "$2" ] && [ -e "/etc/init.d/mariadb" ] +then + chmod +x "/etc/init.d/mariadb" >/dev/null || true +fi + +# dh_installinit/13.11.3 adds this check but with extra condition that there +# must be a version passed as '$2', but that will always be empty when install +# runs after the unpack that is retriggered for package 'mariadb-server' when +# the old 'mariadb-server-10.6' is purged, so we need to repeat the same check +# here without any expectation for '$2'. This ensures that upgrades from +# mariadb-server-x.y to mariadb-server (without version suffix) ends up with the +# executable bit set on /etc/init.d/mariadb. +if [ "$1" = "install" ] && [ -e "/etc/init.d/mariadb" ] +then + chmod +x "/etc/init.d/mariadb" >/dev/null || true +fi |