#!/bin/sh
set -e

type=$1
preversion=$2

kernel_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
}

if [ "$type" != abort-upgrade ]
then
    # Load debconf module if available and usable
    if [ -f /usr/share/debconf/confmodule ] && \
       ( [ "$DEBCONF_USE_CDEBCONF" ] || perl -e "" 2>/dev/null ) ; then
        . /usr/share/debconf/confmodule
        USE_DEBCONF=1
    else
        USE_DEBCONF=
    fi

    # Only change LC_ALL after loading debconf to ensure the debconf templates
    # are properly localized.
    export LC_ALL=C

    # 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
        # sanity checking for the appropriate kernel on each architecture.
        kernel_ver=`uname -r`
        case ${DPKG_MAINTSCRIPT_ARCH} in
            *)
                # The GNU libc requires a >= 3.2 kernel, found in wheezy
                kernel_ver_min=3.2
                kernel_ver_rec=3.2
                ;;
        esac

        if kernel_compare_versions "$kernel_ver" lt $kernel_ver_min
        then
            if [ "$USE_DEBCONF" ]
            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 and reboot before installing"
                echo 'glibc. You may need to use "apt -f install" after reboot to solve dependencies.'
                echo
            fi
            exit 1
        fi

        if kernel_compare_versions "$kernel_ver" lt $kernel_ver_rec
        then
            if [ "$USE_DEBCONF" ]
            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 [ $system = "GNU/kFreeBSD" ]
    then
        kernel_ver=`uname -r`
        kernel_ver_min=8.3
        if kernel_compare_versions "$kernel_ver" lt $kernel_ver_min
        then
            if [ "$USE_DEBCONF" ]
            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 and reboot before installing"
                echo 'glibc. You may need to use "apt -f install" after reboot to solve dependencies.'
                echo
            fi
            exit 1
        fi

    elif [ $system = "GNU" ]
    then
        kernel_ver=`uname -v | cut -d / -f 1 | cut -d ' ' -f 2`
        kernel_ver_git=${kernel_ver#*+git}
        kernel_ver_git=${kernel_ver_git%%-*}
        kernel_ver=${kernel_ver%+git*}
        kernel_ver_min=1.8
        kernel_ver_git_min=20210923
        if kernel_compare_versions "$kernel_ver" lt $kernel_ver_min || \
         ( kernel_compare_versions "$kernel_ver" eq $kernel_ver_min && \
            [ "$kernel_ver_git" -lt $kernel_ver_git_min ] )
        then
            if [ "$USE_DEBCONF" ]
            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 $kernel_ver_min+git$kernel_ver_git_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 "$kernel_ver_min+git$kernel_ver_git_min or later."
                echo "Please upgrade your kernel and reboot before installing glibc."
                echo 'You may need to use "apt -f install" after reboot to solve dependencies.'
                echo
            fi
            exit 1
        fi
    fi
fi

if [ "$type" = upgrade ]
then
    if [ -n "$preversion" ] && [ -x "$(command -v ischroot)" ] && ! ischroot; then
	# NSS authentication trouble guard
	if dpkg --compare-versions "$preversion" lt 2.39; then
	    if grep -E -q '(^|/)(xscreensaver|xlockmore)' /proc/*/cmdline 2>/dev/null; then
		if [ "$USE_DEBCONF" ] ; then
		    db_version 2.0
		    db_reset glibc/disable-screensaver
		    db_input critical glibc/disable-screensaver || true
		    db_go || true
		else
		    echo "xscreensaver and xlockmore must be restarted before upgrading"
		    echo
		    echo "One or more running instances of xscreensaver or xlockmore have been"
		    echo "detected on this system. Because of incompatible library changes, the"
		    echo "upgrade of the GNU C library will leave you unable to authenticate to"
		    echo "these programs. You should arrange for these programs to be restarted"
		    echo "or stopped before continuing this upgrade, to avoid locking your users"
		    echo "out of their current sessions."
		    echo
		    frontend=`echo "$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"
	    # NSS services check:
	    	    echo -n "Checking for services that may need to be restarted..."
	    # Only get the ones that are installed, of the same architecture
	    # as libc (or arch all) and configured. Restart openssh-server even
	    # if only half-configured to continue accepting new connections
	    # during the upgrade.
	    [ -n "$check" ] && check=$(dpkg-query -W -f='${binary:Package} ${Status} ${Architecture}\n' $check 2> /dev/null | \
			grep -E "(^openssh-server .* unpacked|installed) (all|${DPKG_MAINTSCRIPT_ARCH})$" | sed 's/[: ].*//')
	    # some init scripts don't match the package names
	    check=$(echo $check | \
		    sed -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/\bopenssh-server\b/ssh/g' \
			-e's/\bsasl2-bin\b/saslauthd/g' \
			-e's/\bsamba\b/smbd/g' \
			-e's/\bpostgresql-common\b/postgresql/g' \
		    )
	    echo
	    echo "Checking init scripts..."
	    for service in $check; do
		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
	    done

	    if [ -n "$services" ]; then 
		if [ "$USE_DEBCONF" ] ; 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

            # As long systemd-logind has not seen any login request since the system has been
            # booted, it has not loaded any NSS module. In that condition if glibc is upgraded
            # (that means with a non session shell or by some automation), the NSS modules are
            # replaced by a new major version which might be incompatible (and definitely are
            # for some versions).
            #
            # The solution implemented for most daemons is to restart them, but unfortunately
            # it is not something supported with systemd-logind (see bug#91950).
            #
            # As a workaround, when detected that the system is using systemd and that the
            # systemd-logind process has not not loaded any NSS module, force systemd-logind to
            # load NSS modules. This is done by disabling lingering on a non-existing user. This
            # has to be done by talking directly to systemd-logind through sd-bus, as loginctl
            # first checks if the user actually exist. The nonexistent uid is chosen as
            # 4294967294, which is reserved by Policy §9.2.2.
            #
            # Note that starting with glibc 2.34, the nss_files is builtin. When glibc >= 2.34
            # ends-up in a stable release, this workaround can therefore be dropped.
            if dpkg --compare-versions "$preversion" lt 2.34 && [ -d /run/systemd/system ]; then
                if ! grep -q -E 'libnss_(compat|db|files)' /proc/$(systemctl show --property MainPID --value systemd-logind.service)/maps >/dev/null 2>&1; then
                    echo "Forcing systemd-logind to load NSS modules..."
                    busctl call --system org.freedesktop.login1 /org/freedesktop/login1 org.freedesktop.login1.Manager \
                        SetUserLinger ubb 4294967294 false false >/dev/null 2>&1 || true
                fi
            fi

            services=""
            check="apache2 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="$check webmin dropbear gdm gdm3"
            # the following substitution processes the check variable
            # and returns results in the services variable
            # NSS services check:
            	    echo -n "Checking for services that may need to be restarted..."
	    # Only get the ones that are installed, of the same architecture
	    # as libc (or arch all) and configured. Restart openssh-server even
	    # if only half-configured to continue accepting new connections
	    # during the upgrade.
	    [ -n "$check" ] && check=$(dpkg-query -W -f='${binary:Package} ${Status} ${Architecture}\n' $check 2> /dev/null | \
			grep -E "(^openssh-server .* unpacked|installed) (all|${DPKG_MAINTSCRIPT_ARCH})$" | sed 's/[: ].*//')
	    # some init scripts don't match the package names
	    check=$(echo $check | \
		    sed -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/\bopenssh-server\b/ssh/g' \
			-e's/\bsasl2-bin\b/saslauthd/g' \
			-e's/\bsamba\b/smbd/g' \
			-e's/\bpostgresql-common\b/postgresql/g' \
		    )
	    echo
	    echo "Checking init scripts..."
	    for service in $check; do
		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
	    done

            if [ -n "$services" ] && [ ! -x /usr/lib/needrestart/apt-pinvoke ]; then
                if [ "$USE_DEBCONF" ] ; 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 $services; do
                        case "$service" in
                            cron)
                                # See bug (LP: #508083)
                                echo -n "  $service: stopping..."
                                if invoke-rc.d ${service} stop > /dev/null 2>&1; then
                                    echo "done."
                                    echo "$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 Glibc6_VERSION
    fi # Upgrading
fi

# We create the top-level lib symlink on merged-usr systems, so that we can
# cover cases where for example libc6:amd64 on i386 is installed and then removed
# (which deletes the symlink too). Note that we only suppor the simplest case,
# no conversion (moving files) is done here, as that's the job of the usrmerge
# package. See: https://bugs.debian.org/926699
# Once all packages install only under /usr, this can be removed, as removing
# this package will no longer result in the symlink being deleted.
if [ "$1" = "install" ] || [ "$1" = "upgrade" ]; then
    if [ -L "$DPKG_ROOT/lib" ]; then
        # Has the link already been created?
        # If it has not, is a directory already there? Half-merged systems are
        # the problem of usrmerge, simply ignore them here.
        if [ ! -L "${DPKG_ROOT}/lib64" ] && [ ! -d "${DPKG_ROOT}/lib64" ]; then
            mkdir -p "$DPKG_ROOT/usr/lib64"
            ln -s usr/lib64 "${DPKG_ROOT}/lib64"
        fi
    fi
fi

# begin-remove-after: released:forky
# Add DEP17 M4 protective diversions. These should be added by base-files, but
# we want to avoid Pre-Depends: base-files (>= trixie) and therefore add them
# for base-files. As bookworm's base-files installs bin lib and sbin, the only
# directory we may miss is the one containing the runtime linker when it is not
# /lib.
if [ "$1" = install -o "$1" = upgrade ] && [ "/lib64" != "/lib" ]; then
    dpkg-divert --quiet --add --no-rename --package base-files --divert "/lib64.usr-is-merged" "/lib64"
fi
# end-remove-after

# Add DEP17 M8 protective diversions for the runtime dynamic linker. It is
# installed in both libc (multiarch) and libc-alt (multilib) amounting to a
# move and thus DEP17 P1 problem. This diversion should be removed by forky's
# libc.postinst.
if [ "$1" = install ] || [ "$1" = upgrade ]; then
    dpkg-divert --quiet --add --no-rename --divert "/lib64/ld-linux-x86-64.so.2.usr-is-merged" "/lib64/ld-linux-x86-64.so.2"
fi



if [ -n "$preversion" ]; then
    if dpkg --compare-versions "$preversion" lt 2.39; 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 "$DPKG_ROOT/etc/ld.so.cache"
       rm -f "$DPKG_ROOT/var/cache/ldconfig/aux-cache"
    fi
fi

exit 0
