Current File : //proc/thread-self/root/snap/core20/current/usr/bin/ucf
#!/bin/bash
# -*- Mode: Sh -*-
# updateConfFile.sh ---
# Author : Manoj Srivastava ( srivasta@glaurung.green-gryphon.com )
# Created On : Fri Feb 1 03:41:47 2002
# Created On Node : glaurung.green-gryphon.com
# Last Modified By : Manoj Srivastava
# Last Modified On : Tue Jun 6 09:48:22 2006
# Last Machine Used: glaurung.internal.golden-gryphon.com
# Update Count : 186
# Status : Unknown, Use with caution!
# HISTORY :
# Description :
#
# This script attempts to provide conffile like handling for files not
# shipped in a Debian package, but handled by the postinst. Using this
# script, one may ship a bunch of default cofiguration files somewhere
# in /usr (/usr/share/<pkg> is a good location), and maintain files in
# /etc.
#
# The motivation for this script was to provide conffile like handling
# for start files for emacs lisp packages (for example,
# /etc/emacs21/site-stard.d/50psgml-init.el) These start files are not
# shipped with the package, instead, they are installed during the
# post installation configuration phase by the script
# /usr/lib/emacsen-common/emacs-package-install $package_name.
#
# This script is meant to be invoked by the packages install script at
# /usr/lib/emacsen-common/packages/install/$package_name for each
# flavour of installed emacsen by calling it with the proper values of
# new file (/usr/share/emacs/site-lisp/<pkg>/<pkg>-init.el), and dest file
# (/etc/emacs21/site-stard.d/50<pkg>-init.el)), and it should do the rest.
#
# make sure we exit on error
set -e
# set the version and revision
progname="$(basename $0)"
pversion='Revision: 3.00 '
unset GREP_OPTIONS
######################################################################
######## #########
######## Utility functions #########
######## #########
######################################################################
setq() {
# Variable Value Doc_string
if [ "x$2" = "x" ]; then
echo >&2 "$progname: Unable to determine $3"
exit 1;
else
if [ "x$VERBOSE" != "x" ]; then
echo >&2 "$progname: $3 is $2";
fi
eval "$1=\"\$2\"";
fi
}
# Usage: get_file_metadate file_name
get_file_metadata()
{
if [ -e "$1" ]; then
# get file modification date without the nanoseconds and timezone info
local moddate="$(date +"%F %T" --date $(stat --format '@%Y' "$1"))"
# print file_name user.group permissions above_date
stat --format "%n %U.%G 0%a $moddate" "$1"
else
echo "/dev/null"
fi
}
# Runs the diff command with approrpiate arguments
# Usage run_diff diff|sdiff diff_opts old_file new_file
run_diff()
{
local diff_cmd="$1"
local diff_opt="$2"
local old_file="$3"
local new_file="$4"
# Note: get_file_metadata not in quotes to ignore "\n" characters
local old_file_label=$(get_file_metadata "$old_file")
local new_file_label=$(get_file_metadata "$new_file")
[ -e "$old_file" ] || old_file=/dev/null
[ -e "$new_file" ] || new_file=/dev/null
if [ "$diff_cmd" = "diff" ] ; then
diff "$diff_opt" --label "$old_file_label" "$old_file" \
--label "$new_file_label" "$new_file" || true
elif [ "$diff_cmd" = "sdiff" ] ; then
# unfortunatelly the sdiff command does not support --label option
local out="$(sdiff "$diff_opt" "$old_file" "$new_file")" || true
[ -z "$out" ] || printf "Old file: %s\nNew file: %s\n\n%s" \
"$old_file_label" "$new_file_label" "$out"
else
echo "Unknown diff command: $diff_cmd" >&2
exit 1
fi
}
# Use debconf to show the differences
# Usage: show_diff actual_file_differences file_stat_differences
show_diff() {
if [ -z "$1" ]; then
DIFF="There are no non-white space differences in the files."
else
if [ 99999 -lt "$(echo $1 | wc -c | awk '{print $1; }')" ]; then
DIFF="The differences between the files are too large to display."
else
DIFF="$1"
fi
fi
if [ "$DEBCONF_OK" = "YES" ] && [ "$DEBIAN_HAS_FRONTEND" ]; then
templ=ucf/show_diff
db_capb escape
db_subst $templ DIFF "$(printf %s "$DIFF" | debconf-escape -e)"
db_fset $templ seen false
db_input critical $templ || true
db_go || true
db_get $templ
# may contain sensitive information, so clear
# immediatly after use so it is never written
# to disk
db_subst $templ DIFF ""
db_reset $templ
db_capb
else
if [ -z "$my_pager" ]; then
echo "$DIFF" | sensible-pager
else
echo "$DIFF" | $my_pager
fi
fi
}
withecho () {
echo "$@" >&2
"$@"
}
usageversion () {
cat >&2 <<END
Debian GNU/Linux $progname $pversion.
Copyright (C) 2002-2005 Manoj Srivastava.
This is free software; see the GNU General Public Licence for copying
conditions. There is NO warranty.
Usage: $progname [options] new_file destination
Options:
-h, --help print this message
-s foo, --src-dir foo Set the src dir (historical md5sums live here)
--sum-file bar Force the historical md5sums to be read from
this file. Overrides any setting of --src-dir.
-d[n], --debug=[n] Set the Debug level to N. Please note there must
be no spaces before the debug level
-n, --no-action Dry run. No action is actually taken.
-v, --verbose Make the script verbose
--three-way Register this file in the cache, and turn on the
diff3 option allowing the merging of maintainer
changes into a (potentially modified) local
configuration file. )
--state-dir bar Set the state directory to bar instead of the
default '/var/lib/ucf'. Used mostly for testing.
--debconf-ok Indicate that it is ok for ucf to use an already
running debconf instance for prompting.
--debconf-template bar
Specify an alternate, caller-provided debconf
template to use for prompting.
Usage: $progname -p destination
-p, --purge Remove any reference to destination from records
By default, the directory the new_file lives in is assumed to be the src-dir,
which is where we look for any historical md5sums.
END
}
######################################################################
######## #########
######## file and hash save/restore functions #########
######## #########
######################################################################
purge_md5sum () {
for i in $(/usr/bin/seq 6 -1 0); do
if [ -e "${statedir}/hashfile.${i}" ]; then
if [ "X$docmd" = "XYES" ]; then
cp -pf "${statedir}/hashfile.${i}" \
"${statedir}/hashfile.$(($i+1))"
else
echo cp -pf "${statedir}/hashfile.${i}" \
"${statedir}/hashfile.$(($i+1))"
fi
fi
done
if [ -e "$statedir/hashfile" ]; then
if [ "X$docmd" = "XYES" ]; then
cp -pf "$statedir/hashfile" "$statedir/hashfile.0"
else
echo cp -pf "$statedir/hashfile" "$statedir/hashfile.0"
fi
if [ "X$docmd" = "XYES" ]; then
set +e
if [ "X$VERBOSE" != "X" ]; then
echo >&2 "egrep -v [[:space:]]${safe_dest_file}$ $statedir/hashfile"
egrep -v "[[:space:]]${safe_dest_file}$" "$statedir/hashfile" >&2 \
|| true;
fi
#echo "egrep -v [[:space:]]${safe_dest_file}$ $statedir/hashfile"
egrep -v "[[:space:]]${safe_dest_file}$" "$statedir/hashfile" > \
"$statedir/hashfile.tmp" || true;
if [ "X$docmd" = "XYES" ]; then
mv -f "$statedir/hashfile.tmp" "$statedir/hashfile"
else
echo mv -f "$statedir/hashfile.tmp" "$statedir/hashfile"
fi
set -e
fi
fi
test -n "$VERBOSE" && echo >&2 "The cache file is $cached_file"
if [ ! -z "$cached_file" -a -f "$statedir/cache/$cached_file" ]; then
$action rm -f "$statedir/cache/$cached_file"
fi
}
replace_md5sum () {
for i in $(/usr/bin/seq 6 -1 0); do
if [ -e "${statedir}/hashfile.${i}" ]; then
if [ "X$docmd" = "XYES" ]; then
cp -pf "${statedir}/hashfile.${i}" \
"${statedir}/hashfile.$(($i+1))"
else
echo cp -pf "${statedir}/hashfile.${i}" \
"${statedir}/hashfile.$(($i+1))"
fi
fi
done
if [ -e "$statedir/hashfile" ]; then
if [ "X$docmd" = "XYES" ]; then
cp -pf "$statedir/hashfile" "$statedir/hashfile.0"
else
echo cp -pf "$statedir/hashfile" "$statedir/hashfile.0"
fi
if [ "X$docmd" = "XYES" ]; then
set +e
if [ "X$VERBOSE" != "X" ]; then
echo >&2 "(egrep -v \"[[:space:]]${safe_dest_file}$\" \"$statedir/hashfile\";"
egrep -v "[[:space:]]${safe_dest_file}$" "$statedir/hashfile" >&2 || true;
md5sum "$orig_new_file" | sed "s|$orig_new_file|$dest_file|" >&2;
fi
egrep -v "[[:space:]]${safe_dest_file}$" "$statedir/hashfile" > \
"$statedir/hashfile.tmp" || true;
md5sum "$orig_new_file" | sed "s|$orig_new_file|$dest_file|" >> \
"$statedir/hashfile.tmp";
mv -f "$statedir/hashfile.tmp" "$statedir/hashfile"
set -e
else
echo "(egrep -v \"[[:space:]]${safe_dest_file}$\" \"$statedir/hashfile\""
echo " md5sum \"$orig_new_file\" | sed \"s|$orig_new_file|$dest_file|\"; "
echo ") | sort > \"$statedir/hashfile\""
fi
else
if [ "X$docmd" = "XYES" ]; then
md5sum "$orig_new_file" | sed "s|$orig_new_file|$dest_file|" > \
"$statedir/hashfile"
else
echo " md5sum \"$orig_new_file\" | sed \"s|$orig_new_file|$dest_file|\" >" \
"\"$statedir/hashfile\""
fi
fi
file_size=$(stat -c '%s' "$orig_new_file")
if [ "X$THREEWAY" != "X" ] || [ "$file_size" -lt 25600 ]; then
$action cp -pf "$orig_new_file" "$statedir/cache/$cached_file"
fi
# cp -pf "$orig_new_file" "$dest_file.${DIST_SUFFIX}"
}
replace_conf_file () {
# do not mangle $dest_file since it's the one registered in the hashfile
# or we have been ask to register
real_file="$dest_file"
if [ -L "$dest_file" ]; then
real_file="$(readlink -nf $dest_file || :)"
if [ "x$real_file" = "x" ]; then
echo >&2 "$dest_file is a broken symlink!"
$action rm -f "$dest_file";
real_file="$dest_file"
fi
fi
if [ -e "$real_file" ]; then
if [ -z "$RETAIN_OLD" ]; then
#echo "Saving ${real_file}.${OLD_SUFFIX}, in case."
if [ "x$VERBOSE" != "x" ]; then
echo >&2 "Not saving ${real_file}, since it was unmodified"
fi
else
$action cp -pf "${real_file}" "${real_file}.${OLD_SUFFIX}"
fi
fi
$action cp -pf "$new_file" "${real_file}"
replace_md5sum;
}
# Escape single quotes in the arguments passed in
quote_single() {
echo "$1" | sed -e "s,','\\\\'',g"
}
######################################################################
######## #########
######## Command line args #########
######## #########
######################################################################
#
# Long term variables#
#
docmd='YES'
action='withecho'
action=
DEBUG=0
VERBOSE=''
statedir='/var/lib/ucf';
THREEWAY=
DIST_SUFFIX="ucf-dist"
NEW_SUFFIX="ucf-new"
OLD_SUFFIX="ucf-old"
ERR_SUFFIX="merge-error"
# save up the cmdline with proper quoting/escaping
for arg in "$@"; do
saved="${saved:+$saved }'$(quote_single "$arg")'"
done
# Note that we use `"$@"' to let each command-line parameter expand to a
# separate word. The quotes around `$@' are essential!
# We need TEMP as the `eval set --' would nuke the return value of getopt.
TEMP=$(getopt -a -o hs:d::D::nv -n "$progname" \
--long help,src-dir:,sum-file:,dest-dir:,debug::,DEBUG::,no-action,purge,verbose,three-way,debconf-ok,debconf-template:,state-dir: \
-- "$@")
# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"
while true ; do
case "$1" in
-h|--help) usageversion; exit 0 ;;
-n|--no-action) action='echo'; docmd='NO'; shift ;;
-v|--verbose) VERBOSE=1; shift ;;
-s|--src-dir)
opt_source_dir="$2"; shift 2 ;;
--sum-file)
opt_old_mdsum_file="$2"; shift 2 ;;
--state-dir)
opt_state_dir="$2"; shift 2 ;;
--debconf-template)
override_template="$2"; shift 2 ;;
-D|-d|--debug|--DEBUG)
# d has an optional argument. As we are in quoted mode,
# an empty parameter will be generated if its optional
# argument is not found.
case "$2" in
"") setq DEBUG 1 "The Debug value"; shift 2 ;;
*) setq DEBUG "$2" "The Debug value"; shift 2 ;;
esac ;;
-p|--purge) PURGE=YES; shift ;;
--three-way) THREEWAY=YES; shift ;;
--debconf-ok) DEBCONF_OK=YES; shift ;;
--) shift ; break ;;
*) echo >&2 "Internal error!" ; exit 1 ;;
esac
done
######################################################################
######## #########
######## Sanity checking #########
######## #########
######################################################################
# Need to run as root, or else the
if test "$(id -u)" != 0; then
if [ "$docmd" = "YES" ]; then
echo "$progname: Need to be run as root." >&2
echo "$progname: Setting up no action mode." >&2
action='echo'; docmd='NO';
fi
fi
if [ "X$PURGE" = "XYES" ]; then
if [ $# != 1 ]; then
echo >&2 "*** ERROR: Need exactly one argument when purging, got $#";
echo >&2 ""
usageversion;
exit 2 ;
fi
temp_dest_file="$1";
if [ -e "$temp_dest_file" ]; then
setq dest_file "$(readlink -q -m $temp_dest_file)" "The Destination file";
else
setq dest_file "$temp_dest_file" "The Destination file";
fi
else
if [ $# != 2 ]; then
echo >&2 "*** ERROR: Need exactly two arguments, got $#";
echo >&2 ""
usageversion;
exit 2 ;
fi
temp_new_file="$1";
temp_dest_file="$2";
if [ ! -e "${temp_new_file}" ]; then
echo >&2 "Error: The new file ${temp_new_file} does not exist!";
exit 1;
fi
setq new_file "$(readlink -q -m $temp_new_file)" "The new file";
if [ -e "$temp_dest_file" ]; then
setq dest_file "$(readlink -q -m $temp_dest_file)" "The Destination file";
else
setq dest_file "$temp_dest_file" "The Destination file";
fi
fi
safe_dest_file=$(echo "$dest_file" | perl -nle 'print "\Q$_\E\n"')
######################################################################
######## #########
######## Set Default Values #########
######## #########
######################################################################
# Load site defaults and over rides.
if [ -f /etc/ucf.conf ]; then
. /etc/ucf.conf
fi
# Command line, env variable, config file, or default
if [ ! "x$opt_source_dir" = "x" ]; then
setq source_dir "$opt_source_dir" "The Source directory"
elif [ ! "x$UCF_SOURCE_DIR" = "x" ]; then
setq source_dir "$UCF_SOURCE_DIR" "The Source directory"
elif [ ! "x$conf_source_dir" = "x" ]; then
setq source_dir "$conf_source_dir" "The Source directory"
else
if [ "X$new_file" != "X" ]; then
setq source_dir "$(dirname $new_file)" "The Source directory"
else
setq source_dir "/tmp" "The Source directory"
fi
fi
if [ "X$PAGER" != "X" ] && which "$PAGER" >/dev/null 2>&1 ; then
my_pager="$(which $PAGER)";
elif [ -s /usr/bin/pager ] &&
[ "X$(readlink -e /usr/bin/pager || :)" != "X" ]; then
my_pager=/usr/bin/pager
elif [ -x /usr/bin/sensible-pager ]; then
my_pager=/usr/bin/sensible-pager
elif [ -x /bin/more ]; then
my_pager=/bin/more
else
my_pager=
fi
# Command line, env variable, config file, or default
if [ ! "x$opt_state_dir" = "x" ]; then
setq statedir "$opt_state_dir" "The State directory"
elif [ ! "x$UCF_STATE_DIR" = "x" ]; then
setq statedir "$UCF_STATE_DIR" "The State directory"
elif [ ! "x$conf_state_dir" = "x" ]; then
setq statedir "$conf_state_dir" "The State directory"
else
setq statedir '/var/lib/ucf' "The State directory"
fi
# Command line, env variable, config file, or default
if [ ! "x$opt_force_conffold" = "x" ]; then
setq force_conffold "$opt_force_conffold" "Keep the old file"
elif [ ! "x$UCF_FORCE_CONFFOLD" = "x" ]; then
setq force_conffold "$UCF_FORCE_CONFFOLD" "Keep the old file"
elif [ ! "x$conf_force_conffold" = "x" ]; then
setq force_conffold "$conf_force_conffold" "Keep the old file"
else
force_conffold=''
fi
# Command line, env variable, config file, or default
if [ ! "x$opt_force_conffnew" = "x" ]; then
setq force_conffnew "$opt_force_conffnew" "Replace the old file"
elif [ ! "x$UCF_FORCE_CONFFNEW" = "x" ]; then
setq force_conffnew "$UCF_FORCE_CONFFNEW" "Replace the old file"
elif [ ! "x$conf_force_conffnew" = "x" ]; then
setq force_conffnew "$conf_force_conffnew" "Replace the old file"
else
force_conffnew=''
fi
# Command line, env variable, config file, or default
if [ ! "x$opt_force_conffmiss" = "x" ]; then
setq force_conffmiss "$opt_force_conffmiss" "Replace any missing files"
elif [ ! "x$UCF_FORCE_CONFFMISS" = "x" ]; then
setq force_conffmiss "$UCF_FORCE_CONFFMISS" "Replace any missing files"
elif [ ! "x$conf_force_conffmiss" = "x" ]; then
setq force_conffmiss "$conf_force_conffmiss" "Replace any missing files"
else
force_conffmiss=''
fi
if [ -n "$opt_old_mdsum_file" ]; then
setq old_mdsum_file "$opt_old_mdsum_file" "The md5sum is found here"
elif [ ! "x$UCF_OLD_MDSUM_FILE" = "x" ]; then
setq old_mdsum_file "$UCF_OLD_MDSUM_FILE" "The md5sum is found here"
elif [ ! "x$conf_old_mdsum_file" = "x" ]; then
setq old_mdsum_file "$conf_old_mdsum_file" "Replace the old file"
elif [ ! "x${new_file}" = "x" ]; then
old_mdsum_file="$source_dir/$(basename ${new_file}).md5sum";
else
old_mdsum_file="";
fi
######################################################################
######## #########
######## More Sanity checking #########
######## #########
######################################################################
if [ "X$force_conffold" != "X" -a "X$force_conffnew" != "X" ]; then
echo >&2 "Error: Only one of force_conffold and force_conffnew should";
echo >&2 " be set";
exit 1;
fi
# VERBOSE of 0 is supposed to be the same as not setting VERBOSE
if [ "X$VERBOSE" = "X0" ]; then
VERBOSE=''
fi
#
if [ -e "$statedir/hashfile" -a ! -w "$statedir/hashfile" ]; then
echo >&2 "ucf: do not have write privilege to the state data"
if [ "X$docmd" = "XYES" ]; then
exit 1;
fi
fi
if [ ! -d $statedir/cache ]; then
$action mkdir -p $statedir/cache ;
fi
# test and see if this file exists in the database
if [ -e "$statedir/hashfile" ]; then
if [ "X$VERBOSE" != "X" ]; then
echo >&2 "The hash file exists"
echo >&2 egrep "[[:space:]]${safe_dest_file}$" "$statedir/hashfile"
egrep "[[:space:]]${safe_dest_file}$" "$statedir/hashfile" >&2 || true
fi
lastsum=$(egrep "[[:space:]]${safe_dest_file}$" "$statedir/hashfile" | \
awk '{print $1;}' )
fi
if [ ! "x${new_file}" = "x" ]; then
old_mdsum_dir="$source_dir/"$(basename "${new_file}")".md5sum.d";
else
old_mdsum_dir="";
fi
cached_file="$(echo $dest_file | tr / :)"
######################################################################
######## #########
######## Debugging dump #########
######## #########
######################################################################
if [ $DEBUG -gt 0 ]; then
cat >&2 <<EOF
The new start file is \`$new_file\'
The destination is \`$dest_file\' (\`$safe_dest_file\')
The history is kept under \'$source_dir\'
The file may be cached at \'$statedir/cache/$cached_file\'
EOF
if [ -s "$dest_file" ]; then
echo "The destination file exists, and has md5sum:"
md5sum "$dest_file"
else
echo "The destination file does not exist."
fi
if [ "X$lastsum" != "X" ]; then
echo "The old md5sum exists, and is:"
echo "$lastsum"
else
echo "The old md5sum does not exist."
if [ -d "$old_mdsum_dir" -o -f "$old_mdsum_file" ]; then
echo "However, there are historical md5sums around."
fi
fi
if [ -e "$new_file" ]; then
echo "The new file exists, and has md5sum:"
md5sum "$new_file"
else
echo "The new file does not exist."
fi
if [ -d "$old_mdsum_dir" ]; then
echo "The historical md5sum dir $old_mdsum_dir exists"
elif [ -f "$old_mdsum_file" ]; then
echo "The historical md5sum file $old_mdsum_file exists"
else
echo "Historical md5sums are not available"
fi
fi
######################################################################
######## #########
######## Short circuit if we are purging #########
######## #########
######################################################################
if [ "X$PURGE" = "XYES" ]; then
if [ "X$VERBOSE" != "X" ]; then
echo >&2 "Preparing to purge ${dest_file}"
fi
purge_md5sum;
exit 0;
fi
# now we can restore $@
eval set -- "$saved"
######################################################################
######## #########
######## DebConf stuff #########
######## #########
######################################################################
# Is debconf already running? Kinda tricky, because it will be after the
# confmodule is sourced, so only test before that.
if [ -z "$DEBCONF_ALREADY_RUNNING" ]; then
if [ "$DEBIAN_HAS_FRONTEND" ]; then
DEBCONF_ALREADY_RUNNING='YES'
else
DEBCONF_ALREADY_RUNNING='NO'
fi
fi
export DEBCONF_ALREADY_RUNNING
if [ -z "$DEBCONF_OK" ]; then
if [ "$DEBCONF_ALREADY_RUNNING" = 'YES' ]; then
DEBCONF_OK='NO'
else
DEBCONF_OK='YES'
fi
fi
# Time to start nagging the users who call ucf without debconf-ok
if [ "$DEBCONF_ALREADY_RUNNING" = 'YES' ] && [ "$DEBCONF_OK" = NO ]; then
# Commented out for now, uncomment after a while to begin nagging
# maintainers to fix their scripts.
cat \
<<END
*** WARNING: ucf was run from a maintainer script that uses debconf, but
the script did not pass --debconf-ok to ucf. The maintainer
script should be fixed to not stop debconf before calling ucf,
and pass it this parameter. For now, ucf will revert to using
old-style, non-debconf prompting. Ugh!
Please inform the package maintainer about this problem.
END
fi
# Start up debconf or at least get the db_* commands available
if [ -e /usr/share/debconf/confmodule ]; then
if test "$(id -u)" = 0; then
. /usr/share/debconf/confmodule
# Load our templates, just in case our template has
# not been loaded or the Debconf DB lost or corrupted
# since then, but only if it is OK to use debconf.
if [ "$DEBCONF_OK" = 'YES' ]; then
db_x_loadtemplatefile "$(dpkg-query --control-path ucf templates)" ucf
fi
else
echo >&2 "$progname: Not loading confmodule, since we are not running as root."
fi
# Only set the title if debconf was not already running.
# If it was running, then we do not want to clobber the
# title used for configuring the whole package with debconf.
if [ "$DEBCONF_ALREADY_RUNNING" = 'NO' ]; then
if ! db_settitle ucf/title 2>/dev/null; then
# Older debconf that does not support that command.
if test "$(id -u)" = 0; then
db_title "Modified configuration file"
else
echo >&2 "$progname: Not changing title, since we are not running as root."
fi
fi
fi
fi
######################################################################
######## #########
######## Start Processing #########
######## #########
######################################################################
orig_new_file="$new_file" # Since sometimes we replace the newfile below
newsum=$(md5sum "$new_file" | awk '{print $1}')
# Determine the action for the current file. The default is to ask,
# with non-replacement being the norm.
# If the config dir exists
# if file in always overwrite, state +=1;
# fi
# if file in never overwrite, state +=2;
# fi
# if file in ask; state +=4
# fi
# if state == 0; then state = default
# if state >= 4; ask
# if state == 3; ask
# if state == 2; exit
# if state == 1; then replace_conffile; exit
######################################################################
######## #########
######## Do the replacement #########
######## #########
######################################################################
# Step 1: If we have no record of this file, and dest file
# does, We need to determine how to initialize the
# ${old_mdsum_prefix}.old file..
if [ -e "$dest_file" ]; then
destsum=$(md5sum "$dest_file" | awk '{print $1}');
if [ "X$lastsum" = "X" ]; then
# a: If we have a directory containing historical md5sums of this
# file in question, we should look and see if the currently
# installed file matches any of the old md5sums; in which case
# it can be silently replaced.
if [ -d "$old_mdsum_dir" -o -f "$old_mdsum_file" ]; then
if [ -d "$old_mdsum_dir" ]; then
for file in ${old_mdsum_dir}/*; do
oldsum="$(awk '{print $1}' $file)";
if [ "$oldsum" = "$destsum" ]; then
if [ "X$force_conffold" = "X" ]; then
# Bingo! replace, set the md5sum, and we are done
if [ "X$VERBOSE" != "X" ]; then
echo >&2 \
"Replacing config file $dest_file with new version"
fi
replace_conf_file;
exit 0;
else
replace_md5sum;
cp -pf "$orig_new_file" "$dest_file.${DIST_SUFFIX}"
exit 0;
fi
fi
done
elif [ -f "$old_mdsum_file" ]; then
oldsum=$(egrep "^${destsum}" "$old_mdsum_file" || true)
if [ "X$oldsum" != "X" ]; then
# Bingo
if [ "X$force_conffold" = "X" ]; then
if [ "X$VERBOSE" != "X" ]; then
echo >&2 \
"Replacing config file $dest_file with new version"
fi
replace_conf_file;
exit 0;
else
replace_md5sum;
cp -pf "$orig_new_file" "$dest_file.${DIST_SUFFIX}"
exit 0;
fi
fi
fi
# Well, nothing matched. We now check to see if the
# maintainer has an opinion on how to set the ``md5sum of the
# previously installed version'', since we have no way of
# determining that automatically. Please note that unless
# there are limited number of previously released packages
# (like just one), the maintainer is also making a guess at
# this point by supplying a historical md5sum default file.
if [ "X$VERBOSE" != "X" ]; then
echo >&2 "Histotical md5sums did not match."
fi
if [ -d "$old_mdsum_dir" ]; then
if [ -e "${old_mdsum_dir}/default" ]; then
if [ "X$VERBOSE" != "X" ]; then
echo >&2 "However, a default entry exists, using it."
fi
lastsum="$(awk '{print $1;}' ${old_mdsum_dir}/default)"
do_replace_md5sum=1;
fi
elif [ -f "$old_mdsum_file" ]; then
oldsum=$(egrep "[[:space:]]default$" "$old_mdsum_file" | \
awk '{print $1;}')
if [ "X$oldsum" != "X" ]; then
# Bingo
lastsum=$oldsum;
do_replace_md5sum=1;
fi
fi
fi
# At this point, we are almost certain that either the
# historical record of md5sums is not complete, or the user has
# changed the configuration file. Rather than guessing and
# chosing one of the historical md5sums, we fall through to the
# solution used if there had been no historical md5sums
# directory/file.
if [ "X$lastsum" = "X" ]; then
# b: We do not have a historical list of md5sums, or none
# matched, and we still need to initialize the
# ${old_mdsum_prefix}.old file. We can't determine whther or
# not they made any changes, so we err on the side of caution
# and ask'
if [ "X$VERBOSE" != "X" ]; then
echo >&2 "No match found, we shall ask."
fi
lastsum='AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA';
fi # the old md5sum file does not exist, and the historical
# record failed
fi # the old md5sum file does not exist (bug))
else # "$dest_file" does not exist
# Step 2: If destfile does not exist, create it, set the file
# "${old_mdsum_prefix}.old" to the md5sum of the new file, and we
# are done
if [ "X$lastsum" = "X" ]; then
# Ok, so there is no indication that the package was ever
# installed on this machine.
echo >&2 ""
echo >&2 "Creating config file $dest_file with new version"
replace_conf_file;
exit 0;
elif [ "$lastsum" = "$newsum" ]; then
# OK, new version of the file is the same as the last version
# we saw. Since the user apparently has deleted the file,
# nothing needs be done, unless we have been told differently
if [ "X$force_conffmiss" != "X" ]; then
echo >&2 ""
echo >&2 "Recreating deleted config file $dest_file with new version, as asked"
replace_conf_file;
exit 0;
else
echo >&2 "Not replacing deleted config file $dest_file";
fi
else
# OK. New upstream version.
if [ "X$force_conffmiss" != "X" ]; then
# User has said to replace missing files, so we do so, no
# questions asked.
echo >&2 ""
echo >&2 "Recreating deleted config file $dest_file with new version, as asked"
replace_conf_file;
exit 0;
else
# Even though the user has deleted this file, they should
# be asked now, unless specified otherwise.
if [ "X$force_conffold" = "X" ]; then
destsum='AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA';
else
exit 0;
fi
fi
fi
fi
# Here, the destfile exists.
# step 3: If the old md5sum and the md5sum of the new file
# do not match, we need to take action.
if [ "$lastsum" = "$newsum" ]; then
if [ "X$VERBOSE" != "X" ]; then
echo >&2 "md5sums match, nothing needs be done."
fi
if [ "X$do_replace_md5sum" != "X" ]; then
replace_md5sum;
fi
exit 0; # Hah. Match. We are done.
fi
# a: If the md5sum of the dest file is the same as lastsum, replace the
# destfile, saying we are replacing old config files
if [ "$destsum" = "$lastsum" ]; then
if [ "X$force_conffold" = "X" ]; then
echo >&2 "Replacing config file $dest_file with new version"
replace_conf_file;
exit 0;
else
replace_md5sum;
cp -pf "$orig_new_file" "$dest_file.${DIST_SUFFIX}"
exit 0;
fi
else
# b: If the md5sum of the dest file differs from lastsum, we need to ask
# the user what action to take.
if [ "X$force_conffnew" != "X" ]; then
echo >&2 "Replacing config file $dest_file with new version"
echo >&2 "since you asked for it."
if [ "$destsum" = "$newsum" ]; then
echo >&2 "The new and the old files are identical, AFAICS"
else
echo >&2 "The new and the old files are different"
fi
replace_conf_file;
exit 0;
fi
if [ "X$force_conffold" != "X" ]; then
replace_md5sum;
cp -pf "$orig_new_file" "$dest_file.${DIST_SUFFIX}"
exit 0;
fi
# c: If the destination file is the same as the new maintianer provided one,
# we need do nothing.
if [ "$newsum" = "$destsum" ]; then
if [ "X$VERBOSE" != "X" ]; then
echo >&2 "md5sums of the file in place matches, nothing needs be done."
fi
replace_md5sum;
exit 0; # Hah. Match. We are done.
fi
done='NO';
while [ "X$done" = "XNO" ]; do
if [ "$DEBCONF_OK" = "YES" ] && [ "$DEBIAN_HAS_FRONTEND" ]; then
# Use debconf to prompt.
if [ -e "$statedir/cache/$cached_file" ] && [ "X$THREEWAY" != "X" ]; then
templ=ucf/changeprompt_threeway
else
templ=ucf/changeprompt
fi
if [ "X$override_template" != "X" ]; then
choices="$(db_metaget $templ Choices-C)"
choices2="$(db_metaget $override_template Choices-C)"
if [ "$choices" = "$choices2" ]; then
templ=$override_template
fi
fi
db_fset "$templ" seen false
db_reset "$templ"
db_subst "$templ" FILE "$dest_file"
db_subst "$templ" NEW "$new_file"
db_subst "$templ" BASENAME "$(basename $dest_file)"
db_input critical "$templ" || true
if ! db_go; then
# The current ucf interface does not provide a way for it
# to tell its caller that the user chose to back up.
# However, we could get here, if the caller turned on
# debconf's backup capb. The best thing to do seems to be
# to ignore requests to back up.
continue
fi
db_get "$templ"
ANSWER="$RET"
else
echo >&2 "Need debconf to interact"
exit 2
########################################################################################
# # Prompt without using debconf. #
# cat >&2 <<EOPRMT #
# Configuration file \`$dest_file' #
# ==> File on system created by you or by a script. #
# ==> File also in package provided by package maintainer. #
# What would you like to do about it ? Your options are: #
# Y or I : install the package maintainer's version #
# N or O : keep your currently-installed version #
# D : show the differences between the versions #
# S : show the side-by-side differences between the versions #
# EOPRMT #
# if [ "X$THREEWAY" != "X" -a -e "$statedir/cache/$cached_file" ]; then #
# cat >&2 <<EOTD #
# 3 or T : show a three way difference between current, older, #
# and new versions of the file #
# M : Do a 3 way merge between current, older, #
# and new versions of the file [Very Experimental] #
# EOTD #
# fi #
# cat >&2 <<EOPEND #
# Z : start a new shell to examine the situation #
# The default action is to keep your current version. #
# EOPEND #
# if [ "X$THREEWAY" != "X" -a -e "$statedir/cache/$cached_file" ]; then #
# echo -n >&2 "*** " $(basename "$dest_file") \ #
# " (Y/I/N/O/D/3/T/M/Z) [default=N] ?" #
# else #
# echo -n >&2 "*** " $(basename "$dest_file") \ #
# " (Y/I/N/O/D/Z) [default=N] ?" #
# fi #
# read -e ANSWER </dev/tty #
########################################################################################
fi
case "$ANSWER" in
install_new|y|Y|I|i)
echo >&2 "Replacing config file $dest_file with new version"
RETAIN_OLD=YES
replace_conf_file;
exit 0;
;;
diff|D|d)
DIFF="$(run_diff diff -uBbwt "$dest_file" "$new_file")"
show_diff "$DIFF"
;;
sdiff|S|s)
DIFF="$(run_diff sdiff -BbW "$dest_file" "$new_file")"
show_diff "$DIFF"
;;
diff_threeway|3|t|T)
if [ -e "$statedir/cache/$cached_file" \
-a "X$THREEWAY" != "X" ]; then
if [ -e "$dest_file" ]; then
DIFF="$(diff3 -L Current -L Older -L New -A \
"$dest_file" "$statedir/cache/$cached_file" \
"$new_file")" || true
else
DIFF="$(diff3 -L Current -L Older -L New -A \
/dev/null "$statedir/cache/$cached_file" \
"$new_file")" || true
fi
show_diff "$DIFF"
else
DIFF="$(run_diff diff -uBbwt "$dest_file" "$new_file")"
show_diff "$DIFF"
fi
;;
merge_threeway|M|m)
echo >&2 "Merging changes into the new version"
if [ -e "$statedir/cache/$cached_file" \
-a "X$THREEWAY" != "X" ]; then
ret=0
diff3 -L Current -L Older -L New -m \
"$dest_file" "$statedir/cache/$cached_file" \
"$new_file" > "$dest_file.${NEW_SUFFIX}" || ret=$?
case "$ret" in
0)
new_file="$dest_file.${NEW_SUFFIX}"
RETAIN_OLD=YES
replace_conf_file
rm -f "$dest_file.${NEW_SUFFIX}" # don't need this around no mo'
exit 0
;;
*)
mv "$dest_file.${NEW_SUFFIX}" "$dest_file.${ERR_SUFFIX}"
db_subst ucf/conflicts_found dest_file "$dest_file"
db_subst ucf/conflicts_found ERR_SUFFIX "${ERR_SUFFIX}"
db_input critical ucf/conflicts_found || true
db_go || true
;;
esac
else
replace_conf_file
rm -f "$dest_file.${NEW_SUFFIX}" # don't need this around no mo'
exit 0
fi
;;
shell|Z|z)
# We explicitly connect STDIN and STDOUT to the
# script's controlling terminal, so even if STDIN is
# fed by a pipe, as is the case when run from
# /usr/bin/debconf, the shell should be fully
# functional. However, the test for a controlling
# terminal uses /usr/bin/tty, which consults only
# STDIN. As far as I can tell, when run from debconf,
# ucf will _never_ use the current terminal. If the
# goal is to check for access to a terminal, the test
# should be for foreground process group membership,
# not a terminal connected to STDIN (tty -s), and not
# a terminal it doesn't necessarily own (tty -s
# </dev/tty). The easiest way do this from a shell is
# probably with /bin/ps.
if ps -o stat= --ppid $$ | grep -q '+'; then
bash >/dev/tty </dev/tty || true
elif [ -n "$DISPLAY" ]; then
x-terminal-emulator || true
else
# Don't know what to do
echo >&2 "No terminal, and no DISPLAY set, can't fork shell."
sleep 3;
fi
;;
keep_current|n|N|o|O|'')
replace_md5sum;
cp -pf "$orig_new_file" "$dest_file.${DIST_SUFFIX}"
exit 0;
;;
*)
if [ "$DEBCONF_OK" = "YES" ]; then
echo "Error: unknown response from debconf:'$RET'" >&2
exit 1
else
echo
echo "Please answer with one of the single letters listed." >&2
echo
fi
esac
done
fi
db_stop
exit 0;
Mini Shell