preinst is in mysql-server-5.7 5.7.21-1ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | #!/bin/bash
#
# 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>
#
set -e
. /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 $*" 1>&2 }
export PATH=$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
UPGRADEDIR=/var/lib/mysql-upgrade
# To avoid having hardcoded paths in the script, we do a search on the path, as suggested at:
# https://www.debian.org/doc/manuals/developers-reference/ch06.en.html#bpp-debian-maint-scripts
pathfind() {
OLDIFS="$IFS"
IFS=:
for p in $PATH; do
if [ -x "$p/$*" ]; then
IFS="$OLDIFS"
return 0
fi
done
IFS="$OLDIFS"
return 1
}
# 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 mysqld in e.g. a different chroot is fine for us.
stop_server() {
if [ ! -x /etc/init.d/mysql ]; then return; fi
set +e
if pathfind invoke-rc.d; then
cmd="invoke-rc.d mysql stop"
else
cmd="/etc/init.d/mysql stop"
fi
$cmd
errno=$?
set -e
# 0=ok, 100=no init script (fresh install)
if [ "$errno" != 0 -a "$errno" != 100 ]; 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
}
################################ main() ##########################
this_version=5.7
# Abort if an NDB cluster is in use.
if egrep -qi -r '^[^#]*ndb.connectstring|^[[:space:]]*\[[[:space:]]*ndb_mgmd' /etc/mysql/; then
db_fset mysql-server/no_upgrade_when_using_ndb seen false || true
db_input high mysql-server/no_upgrade_when_using_ndb || true
db_go
db_stop
exit 1
fi
# Abort if skip-bdb option is enabled, required for 5.0 -> 5.1 upgrades.
#TODO
# Safe the user from stupidities.
is_downgrade_attempt=0
for i in `ls $DATADIR/debian-*.flag 2>/dev/null`; do
found_version=`echo $i | sed 's/.*debian-\([0-9\.]\+\).flag/\1/'`
if dpkg --compare-versions "$this_version" '<<' "$found_version"; then
is_downgrade_attempt=1
break;
fi
done
if [ "$is_downgrade_attempt" = 1 ]; then
if [ -e /etc/mysql/FROZEN -o -h /etc/mysql/FROZEN ]; then
echo "Warning: /etc/mysql/FROZEN already exists" >&2
else
ln -s ../../usr/share/doc/mysql-common/frozen-mode/downgrade /etc/mysql/FROZEN
fi
db_fset mysql-server-$this_version/installation_freeze_mode_active seen false || true
db_input critical mysql-server-$this_version/installation_freeze_mode_active || true
db_go
db_stop
echo "Downgrade from (at least) $found_version to $this_version is not possible." 1>&2
echo "Packaging maintenance of MySQL will stop and the daemon disabled to prevent damage to your system." 1>&2
echo "For help, see /etc/mysql/FROZEN" 1>&2
exit 0
fi
# to be sure
stop_server
# If we use NIS then errors should be tolerated. It's up to the
# user to ensure that the mysql user is correctly setup.
# Beware that there are two ypwhich one of them needs the 2>/dev/null!
if test -n "`which ypwhich 2>/dev/null`" && ypwhich >/dev/null 2>&1; then
set +e
fi
#
# Now we have to ensure the following state:
# /etc/passwd: mysql:x:100:101:MySQL Server:/nonexistent:/bin/false
# /etc/group: mysql:x:101:
#
# Sadly there could any state be present on the system so we have to
# modify everything carefully i.e. not doing a chown before creating
# the user etc...
#
# creating mysql group if he isn't already there
if ! getent group mysql >/dev/null; then
# Adding system group: mysql.
addgroup --system mysql >/dev/null
fi
# creating mysql user if he isn't already there
if ! getent passwd mysql >/dev/null; then
# Adding system user: mysql.
adduser \
--system \
--disabled-login \
--ingroup mysql \
--no-create-home \
--home /nonexistent \
--gecos "MySQL Server" \
--shell /bin/false \
mysql >/dev/null
fi
# end of NIS tolerance zone
set -e
# if there's a symlink, let's store where it's pointing, because otherwise
# it's going to be lost in some situations
for dir in DATADIR LOGDIR; do
checkdir=`eval echo "$"$dir`
if [ -L "$checkdir" ]; then
mkdir -p "$UPGRADEDIR"
cp -dT "$checkdir" "$UPGRADEDIR/$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 BLOCKSIZE= 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..
# The "set +e" is necessary as e.g. a ".journal" of a ext3 partition is
# not chgrp'able (#318435).
set +e
chown mysql:mysql $DATADIR
find $DATADIR -follow -not -group mysql -print0 2>/dev/null \
| xargs -0 --no-run-if-empty chgrp mysql
set -e
db_stop
exit 0
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