preinst is in libc6 2.27-3ubuntu1.
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.
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set -e
export LC_ALL=C
type=$1
preversion=$2
linux_compare_versions () {
verA=$(($(echo "$1" | sed 's/^\([0-9]*\.[0-9]*\)\([^.0-9]\|$\)/\1.0\2/; s/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 10000 + \2 \* 100 + \3/')))
verB=$(($(echo "$3" | sed 's/^\([0-9]*\.[0-9]*\)\([^.0-9]\|$\)/\1.0\2/; s/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 10000 + \2 \* 100 + \3/')))
test $verA -$2 $verB
}
kfreebsd_compare_versions () {
verA=$(($(echo "$1" | sed 's/\([0-9]*\)\.\([0-9]*\).*/\1 \* 100 + \2/')))
verB=$(($(echo "$3" | sed 's/\([0-9]*\)\.\([0-9]*\).*/\1 \* 100 + \2/')))
test $verA -$2 $verB
}
# Sanity check.
# If there are versions of glibc outside of the normal installation
# location (/lib, /lib64, etc.) then things may break very badly
# as soon as ld.so is replaced by a new version. This check is not
# foolproof, but it's pretty accurate. This script ignores libraries
# with different sonames, and libraries incompatible with the
# to-be-installed ld.so.
check_dir () {
msg=$1
dir=$2
# Follow symlinks
dir=$(readlink -e $dir || true)
# Ignore inexistent directories
if ! test -d "$dir" ; then
return
fi
# Detect possible candidates
files=$(ls $dir | egrep '^(ld|lib(d|c|m|pthread|rt|dl))-2.*.so' 2>/dev/null || true)
if test -z "$files" ; then
return
fi
for file in $files ; do
lib=$dir/$file
# Skip if it is a symlink (as installed by lsb-core)
if test -L "$lib" ; then
continue
fi
# Skip if it is the currently dynamic loader
if test "$lib" = "$ldfile" ; then
continue
fi
# See if the found libraries are compatible with the system ld.so;
# if they aren't, they'll be ignored. Check e_ident, e_type (which
# will just be ET_DYN), and e_machine. If a match is found, there
# is a risk of breakage.
libbytes=`head -c 20 $lib | od -c`
if test "$ldbytes" != "$libbytes" ; then
continue
fi
# Binaries owned packages are considered to do the right thing
# First try a quick lookup which should catch all cases on a
# normal system
if echo $libcfiles | grep -q "[ ^]$lib[ $]" ; then
continue
fi
# Slower lookup to confirm
if dpkg-query -S "$lib" >/dev/null 2>&1 ; then
continue
fi
# Output an error message and exit
echo
echo "A copy of the C library was found $msg:"
echo " '$lib'"
echo "It is not safe to upgrade the C library in this situation;"
echo "please remove that copy of the C library or get it out of"
echo "'$dir' and try again."
echo
exit 1
done
}
if [ "$type" != abort-upgrade ]
then
# Load debconf module if available
if [ -f /usr/share/debconf/confmodule ] ; then
. /usr/share/debconf/confmodule
fi
# See if LD_LIBRARY_PATH contains the traditional /lib, but not the
# multiarch path
dirs=$(echo $LD_LIBRARY_PATH | sed 's/:/ /g')
for dir in $dirs ; do
dir=$(readlink -e $dir || true)
case "$dir" in
/lib)
seen_traditional=1
;;
/lib/x86_64-linux-gnu)
seen_multiarch=1
;;
esac
done
if test -n "$seen_traditional" && test -z "$seen_multiarch" ; then
echo
echo "LD_LIBRARY_PATH contains the traditional /lib directory,"
echo "but not the multiarch directory /lib/x86_64-linux-gnu."
echo "It is not safe to upgrade the C library in this situation;"
echo "please remove the /lib/directory from LD_LIBRARY_PATH and"
echo "try again."
echo
exit 1
fi
# glibc kernel version check
system=`uname -s`
if [ "$system" = "Linux" ]
then
# Test to make sure z < 255, in x.y.z-n form of kernel version
# Also make sure we don't trip on x.y.zFOO-n form
kernel_rev=$(uname -r | sed 's/\([0-9]*\.\)\{1,2\}\([0-9]*\)\(.*\)/\2/')
if [ "$kernel_rev" -ge 255 ]
then
echo "ERROR: Your kernel version indicates a revision number"
echo "of 255 or greater. Glibc has a number of built in"
echo "assumptions that this revision number is less than 255."
echo "If you\'ve built your own kernel, please make sure that any"
echo "custom version numbers are appended to the upstream"
echo "kernel number with a dash or some other delimiter."
echo
exit 1
fi
# sanity checking for the appropriate kernel on each architecture.
kernel_ver=`uname -r`
case ${DPKG_MAINTSCRIPT_ARCH:-$(dpkg --print-architecture)} in
*)
# The GNU libc requires a >= 3.2 kernel, found in wheezy
kernel_ver_min=3.2
kernel_ver_rec=3.2
;;
esac
if linux_compare_versions "$kernel_ver" lt $kernel_ver_min
then
if [ -f /usr/share/debconf/confmodule ]
then
db_version 2.0
db_fset glibc/kernel-too-old seen false
db_reset glibc/kernel-too-old
db_subst glibc/kernel-too-old kernel_ver $kernel_ver_rec
db_input critical glibc/kernel-too-old || true
db_go
db_stop
else
echo "ERROR: This version of the GNU libc requires kernel version"
echo "$kernel_ver_rec or later. Please upgrade your kernel before installing"
echo "glibc."
echo
fi
exit 1
fi
if linux_compare_versions "$kernel_ver" lt $kernel_ver_rec
then
if [ -f /usr/share/debconf/confmodule ]
then
db_version 2.0
db_fset glibc/kernel-not-supported seen false
db_reset glibc/kernel-not-supported
db_subst glibc/kernel-not-supported kernel_ver $kernel_ver_rec
db_input critical glibc/kernel-not-supported || true
db_go
db_stop
else
echo "WARNING: This version of the GNU libc requires kernel version"
echo "$kernel_ver_rec or later. Older versions might work but are not officially"
echo "supported. Please consider upgrading your kernel."
echo
fi
fi
elif [ $system = "GNU/kFreeBSD" ]
then
kernel_ver=`uname -r`
kernel_ver_min=8.3
if kfreebsd_compare_versions "$kernel_ver" lt $kernel_ver_min
then
if [ -f /usr/share/debconf/confmodule ]
then
db_version 2.0
db_version 2.0
db_fset glibc/kernel-too-old seen false
db_reset glibc/kernel-too-old
db_subst glibc/kernel-too-old kernel_ver $kernel_ver_min
db_input critical glibc/kernel-too-old || true
db_go
db_stop
else
echo "ERROR: This version of the GNU libc requires kernel version"
echo "$kernel_ver_min or later. Please upgrade your kernel before installing"
echo "glibc."
echo
fi
exit 1
fi
fi
fi
if [ "$type" = upgrade ]
then
# Try to detect copies of the libc library in the various places
# the dynamic linker uses.
ldfile=$(readlink -m /lib64/ld-linux-x86-64.so.2)
if test -f "$file"; then
ldbytes=$(head -c 20 /lib64/ld-linux-x86-64.so.2 | od -c)
else
# If the symlink to the dynamic linker is dangling or missing, set
# ldbytes to an empty string, the test below will fail and all the
# libraries found will be ignored.
ldbytes=""
fi
libcfiles=$(dpkg-query -L ${DPKG_MAINTSCRIPT_PACKAGE}:${DPKG_MAINTSCRIPT_ARCH} 2>/dev/null)
dirs="/lib/x86_64-linux-gnu /lib /lib/tls /lib32 /lib64 /usr/local/lib /usr/local/lib32 /usr/local/lib64"
for dir in $dirs ; do
check_dir "in an unexpected directory" $dir
done
if test -n "$LD_LIBRARY_PATH"; then
dirs=$(echo $LD_LIBRARY_PATH | sed 's/:/ /g')
for dir in $dirs ; do
check_dir "via LD_LIBRARY_PATH" $dir
done
fi
if test -e /etc/ld.so.conf; then
dirs=$(echo $(cat /etc/ld.so.conf))
if test -n "$dirs" ; then
for dir in $dirs ; do
check_dir "via /etc/ld.so.conf" $dir
done
fi
fi
if [ -e /lib/tls/i686/cmov/libc.so.6 ] || [ -e /lib/i686/cmov/libc.so.6 ] ; then
status_i686=$(dpkg -s libc6-i686 2>/dev/null | grep ^Status: | sed -e 's/^Status: \(.*\) \(.*\) \(.*\)/\3/g')
status_xen=$(dpkg -s libc6-xen 2>/dev/null | grep ^Status: | sed -e 's/^Status: \(.*\) \(.*\) \(.*\)/\3/g')
if ([ -z "$status_i686" ] || [ "$status_i686" = "not-installed" ] || [ "$status_i686" = "config-files" ]) && \
([ -z "$status_xen" ] || [ "$status_xen" = "not-installed" ] || [ "$status_xen" = "config-files" ]); then
echo
echo "A non-dpkg owned copy of the libc6-i686 package was found."
echo "It is not safe to upgrade the C library in this situation;"
echo "please remove that copy of the C library and try again."
echo
exit 1
fi
fi
if [ -n "$preversion" ] && [ -x "$(which ischroot)" ] && ! ischroot; then
# NSS authentication trouble guard
if dpkg --compare-versions "$preversion" lt 2.27; then
if pidof xscreensaver xlockmore >/dev/null; then
if [ -f /usr/share/debconf/confmodule ] ; then
db_version 2.0
db_reset glibc/disable-screensaver
db_input critical glibc/disable-screensaver || true
db_go || true
else
echo "xscreensaver and xlockmore must be restarted before upgrading"
echo
echo "One or more running instances of xscreensaver or xlockmore have been"
echo "detected on this system. Because of incompatible library changes, the"
echo "upgrade of the GNU C library will leave you unable to authenticate to"
echo "these programs. You should arrange for these programs to be restarted"
echo "or stopped before continuing this upgrade, to avoid locking your users"
echo "out of their current sessions."
echo
frontend=`echo "$DEBIAN_FRONTEND" | tr '[:upper:]' '[:lower:]'`
if [ "$frontend" = noninteractive ]; then
echo "Non-interactive mode, upgrade glibc forcibly"
else
echo -n "Press a key to continue"
read answer
fi
echo
fi
fi
check="kdm postgresql xdm"
# the following substitution processes the check variable
# and returns results in the services variable
# NSS services check:
echo -n "Checking for services that may need to be restarted..."
# Only get the ones that are installed, and configured
check=$(dpkg -s $check 2> /dev/null | egrep '^Package:|^Status:' | awk '{if ($1 ~ /^Package:/) { package=$2 } else if ($0 ~ /^Status: .* installed$/) { print package }}')
# some init scripts don't match the package names
check=$(echo $check | \
sed -e's/\bapache2.2-common\b/apache2/g' \
-e's/\bat\b/atd/g' \
-e's/\bdovecot-common\b/dovecot/g' \
-e's/\bexim4-base\b/exim4/g' \
-e's/\blpr\b/lpd/g' \
-e's/\blpr-ppd\b/lpd-ppd/g' \
-e's/\bmysql-server\b/mysql/g' \
-e's/\bsasl2-bin\b/saslauthd/g' \
-e's/\bsamaba\b/smbd/g' \
-e's/\bpostgresql-common\b/postgresql/g' \
)
echo
echo "Checking init scripts..."
rl=$(runlevel | sed 's/.*\ //')
for service in $check; do
if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
invoke-rc.d ${service} status >/dev/null 2>/dev/null && status=0 || status=$?
if [ "$status" = "0" ] || [ "$status" = "2" ] ; then
services="$service $services"
elif [ "$status" = "100" ] ; then
echo "WARNING: init script for $service not found."
fi
else
if [ -f /usr/share/file-rc/rc ] || [ -f /usr/lib/file-rc/rc ] && [ -f /etc/runlevel.conf ]; then
idl=$(filerc $rl $service)
else
idl=$(ls /etc/rc${rl}.d/S??${service} 2> /dev/null | head -1)
fi
if [ -n "$idl" ] && [ -x $idl ]; then
services="$service $services"
fi
fi
done
if [ -n "$services" ]; then
if [ -f /usr/share/debconf/confmodule ] ; then
db_version 2.0
db_reset glibc/upgrade
db_subst glibc/upgrade services $services
if [ "$RELEASE_UPGRADE_MODE" = desktop ]; then
db_input medium glibc/upgrade || true
else
db_input critical glibc/upgrade || true
fi
db_go || true
db_get glibc/upgrade
answer=$RET
else
echo "Do you want to upgrade glibc now?"
echo
echo "Running services and programs that are using NSS need to be restarted,"
echo "otherwise they might not be able to do lookup or authentication any more."
echo "The installation process is able to restart some services (such as ssh or"
echo "telnetd), but other programs cannot be restarted automatically. One such"
echo "program that needs manual stopping and restart after the glibc upgrade by"
echo "yourself is xdm - because automatic restart might disconnect your active"
echo "X11 sessions."
echo
echo "This script detected the following installed services which must be"
echo "stopped before the upgrade: $services"
echo
echo "If you want to interrupt the upgrade now and continue later, please"
echo "answer No to the question below."
echo
frontend=`echo "$DEBIAN_FRONTEND" | tr '[:upper:]' '[:lower:]'`
if [ "$frontend" = noninteractive ]; then
echo "Non-interactive mode, upgrade glibc forcibly"
answer=true
else
echo -n "Do you want to upgrade glibc now? [Y/n] "
read answer
case $answer in
Y*|y*) answer=true ;;
N*|n*) answer=false ;;
*) answer=true ;;
esac
fi
echo
fi
if [ "x$answer" != "xtrue" ]; then
echo "Stopped glibc upgrade. Please retry the upgrade after you have"
echo "checked or stopped services by hand."
exit 1
fi
fi
services=""
check="apache2.2-common apache apache-ssl apache-perl autofs at"
check="$check boa cucipop courier-authdaemon cron cups exim"
check="$check exim4-base dovecot-common cucipop incron lprng lpr"
check="$check lpr-ppd mysql-server nis openbsd-inetd"
check="$check openldapd postgresql-common proftpd postfix postfix-tls"
check="$check rsync samba sasl2-bin slapd smail sendmail snmpd ssh"
check="$check spamassassin vsftpd wu-ftpd wu-ftpd-academ wwwoffle"
check="$check webmin dropbear"
# the following substitution processes the check variable
# and returns results in the services variable
# NSS services check: NSS_CHECK
if [ -n "$services" ]; then
if [ -f /usr/share/debconf/confmodule ] ; then
db_version 2.0
if [ "$RELEASE_UPGRADE_MODE" = desktop ]; then
db_input medium libraries/restart-without-asking || true
else
db_input critical libraries/restart-without-asking || true
fi
db_go || true
db_get libraries/restart-without-asking
if [ "$RET" != true ]; then
db_reset glibc/restart-services
db_set glibc/restart-services "$services"
if [ "$RELEASE_UPGRADE_MODE" = desktop ]; then
db_input medium glibc/restart-services || true
else
db_input critical glibc/restart-services || true
fi
db_go || true
db_get glibc/restart-services
services="$RET"
fi
else
echo
echo "Name Service Switch update in the C Library: post-installation question."
echo
echo "Running services and programs that are using NSS need to be restarted,"
echo "otherwise they might not be able to do lookup or authentication any more"
echo "(for services such as ssh, this can affect your ability to login)."
echo "Note: restarting sshd/telnetd should not affect any existing connections."
echo
echo "The services detected are: "
echo " $services"
echo
echo "If other services have begun to fail mysteriously after this upgrade, it is"
echo "probably necessary to restart them too. We recommend that you reboot your"
echo "machine after the upgrade to avoid NSS-related troubles."
echo
frontend=`echo "$DEBIAN_FRONTEND" | tr '[:upper:]' '[:lower:]'`
if [ "$frontend" = noninteractive ]; then
echo "Non-interactive mode, restarting services"
answer=yes
else
echo -n "Do you wish to restart services? [Y/n] "
read answer
case $answer in
N*|n*) services="" ;;
*) ;;
esac
fi
fi
if [ -n "$services" ]; then
echo "Stopping some services possibly affected by the upgrade (will be restarted later):"
for service in $services; do
# We can't just use a generic rewrite here, as it was
# samba in wheezy and smbd in jessie, which confuses.
if [ "$service" = "samba" ]; then
if [ -x /etc/init.d/smbd ] || [ -f /etc/init/smbd ]; then
service="smbd"
fi
fi
if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
idl="invoke-rc.d ${service}"
idlopt="stop"
elif [ -f /usr/share/file-rc/rc ] || [ -f /usr/lib/file-rc/rc ] && [ -f /etc/runlevel.conf ]; then
idl=$(filerc $rl $service)
idlopt="stop"
else
idl=$(ls /etc/rc${rl}.d/S??${service} 2> /dev/null | head -1)
idlopt="stop"
fi
case "$service" in
cron)
# See bug (LP: #508083)
echo -n " $service: stopping..."
if $idl $idlopt > /dev/null 2>&1; then
echo "done."
echo "$service" >> /var/run/services.need_start
else
echo "FAILED! ($?)"
echo "$service" >> /var/run/services.need_restart
fi
;;
*)
# log service details to allow postinst to handle the
# restart.
echo "$service" >> /var/run/services.need_restart
;;
esac
done
fi
echo
else
echo "Nothing to restart."
fi
fi # end upgrading and $preversion lt 2.27
fi # Upgrading
# This will keep us from using hwcap libs (optimized) during an
# upgrade.
touch /etc/ld.so.nohwcap
fi
if [ -n "$preversion" ]; then
if dpkg --compare-versions "$preversion" lt 2.27; then
# unconditionally wipe ld.so.cache on major version upgrades; this
# makes those upgrades a bit slower, but is less error-prone than
# hoping we notice every time the cache format is changed upstream
rm -f /etc/ld.so.cache
rm -f /var/cache/ldconfig/aux-cache
fi
fi
exit 0
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