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|
#!/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>
#
. /usr/share/debconf/confmodule
if [ -n "$DEBIAN_SCRIPT_DEBUG" ]; then set -v -x; DEBIAN_SCRIPT_TRACE=1; fi
${DEBIAN_SCRIPT_TRACE:+ echo "#42#DEBUG# RUNNING $0 $*"}
export PATH=$PATH:/sbin:/usr/sbin:/bin:/usr/bin
MYADMIN="/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf"
DATADIR=/var/lib/mysql
LOGDIR=/var/log/mysql
CACHEDIR=/var/cache/mysql
########################### functions ##############################
# 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!
stop_server() {
if [ -n "`$MYADMIN ping 2>/dev/null`" -o "`ps cax | grep -c ' mysqld$'`" != 0 ]; then
set +e
if [ -x /usr/sbin/invoke-rc.d ]; then
cmd="invoke-rc.d mysql stop"
$cmd
errno=$?
else
cmd="/etc/init.d/mysql stop"
$cmd
errno=$?
fi
set -e
if [ "$errno" != 0 ]; then
echo "${cmd/ */} returned $errno" 1>&2
echo "There is a 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
fi
}
################################ main() ##########################
# Safe the user from stupidities.
if test -f $DATADIR/debian-4.1.flag; then
db_get mysql-server/really_downgrade_from_41 || true
if [ "$RET" = "true" ]; then
rm -f $DATADIR/debian-4.1.flag
else
echo "Aborting downgrade from 4.1 to 4.0." 1>&2
db_stop
exit 1
fi
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 "`which 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:MySQL Server:/var/lib/mysql:/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 \
--ingroup mysql \
--home $DATADIR \
--gecos "MySQL Server" \
--shell /bin/false \
mysql >/dev/null
fi
# end of NIS tolerance zone
set -e
# if there's a symlink, let's store where it's pointing, because otherwise
# it's going to be lost in some situations
for dir in DATADIR LOGDIR; do
checkdir=`eval echo "$"$dir`
if [ -L "$checkdir" ]; then
mkdir -p "$CACHEDIR"
cp -d "$checkdir" "$CACHEDIR/$dir.link"
fi
done
# creating mysql home directory
if [ ! -d $DATADIR -a ! -L $DATADIR ]; then
mkdir $DATADIR
fi
# checking disc space
if LC_ALL=C df --portability $DATADIR/. | tail -n 1 | awk '{ exit ($4>1000) }'; then
echo "ERROR: There's not enough space in $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..
chown mysql:mysql $DATADIR
find $DATADIR -follow -not -group mysql -print0 \
| xargs -0 --no-run-if-empty chgrp mysql
db_stop
#DEBHELPER#
exit 0
|
