3 # This is the X Strike Force shell library for X Window System package
4 # maintainer scripts. It serves to define shell functions commonly used by
5 # such packages, and performs some error checking necessary for proper operation
6 # of those functions. By itself, it does not "do" much; the maintainer scripts
7 # invoke the functions defined here to accomplish package installation and
10 # If you are reading this within a Debian package maintainer script (e.g.,
11 # /var/lib/dpkg)info/PACKAGE.{config,preinst,postinst,prerm,postrm}), you can
12 # skip past this library by scanning forward in this file to the string
15 SOURCE_VERSION=@SOURCE_VERSION@
16 OFFICIAL_BUILD=@OFFICIAL_BUILD@
18 # Use special abnormal exit codes so that problems with this library are more
19 # easily tracked down.
20 SHELL_LIB_INTERNAL_ERROR=86
21 SHELL_LIB_THROWN_ERROR=74
22 SHELL_LIB_USAGE_ERROR=99
24 # old -> new variable names
25 if [ -z "$DEBUG_XORG_PACKAGE" ] && [ -n "$DEBUG_XFREE86_PACKAGE" ]; then
26 DEBUG_XORG_PACKAGE="$DEBUG_XFREE86_PACKAGE"
28 if [ -z "$DEBUG_XORG_DEBCONF" ] && [ -n "$DEBUG_XFREE86_DEBCONF" ]; then
29 DEBUG_XORG_DEBCONF="$DEBUG_XFREE86_DEBCONF"
32 # initial sanity checks
33 if [ -z "$THIS_PACKAGE" ]; then
35 Error: package maintainer script attempted to use shell library without
36 definining \$THIS_PACKAGE shell variable. Please report the package name,
37 version, and the text of this error message to the Debian Bug Tracking System.
38 Visit <http://www.debian.org/Bugs/Reporting> on the World Wide Web for
39 instructions, read the file /usr/share/doc/debian/bug-reporting.txt from the
40 "doc-debian" package, or install the "reportbug" package and use the command of
41 the same name to file a report against version $SOURCE_VERSION of this package.
43 exit $SHELL_LIB_USAGE_ERROR
46 if [ -z "$THIS_SCRIPT" ]; then
48 Error: package maintainer script attempted to use shell library without
49 definining \$THIS_SCRIPT shell variable. Please report the package name,
50 version, and the text of this error message to the Debian Bug Tracking System.
51 Visit <http://www.debian.org/Bugs/Reporting> on the World Wide Web for
52 instructions, read the file /usr/share/doc/debian/bug-reporting.txt from the
53 "doc-debian" package, or install the "reportbug" package and use the command of
54 the same name to file a report against version $SOURCE_VERSION of the
55 "$THIS_PACKAGE" package.
57 exit $SHELL_LIB_USAGE_ERROR
60 if [ "$1" = "reconfigure" ] || [ -n "$DEBCONF_RECONFIGURE" ]; then
66 if ([ "$1" = "install" ] || [ "$1" = "configure" ]) && [ -z "$2" ]; then
70 if [ -z "$RECONFIGURE" ] && [ -z "$FIRSTINST" ]; then
75 message \"Received signal. Aborting $THIS_PACKAGE package $THIS_SCRIPT script.\";\
77 exit 1" HUP INT QUIT TERM
80 # syntax: reject_nondigits [ operand ... ]
82 # scan operands (typically shell variables whose values cannot be trusted) for
83 # characters other than decimal digits and barf if any are found
85 # does the operand contain anything but digits?
86 if ! expr "$1" : "[[:digit:]]\+$" > /dev/null 2>&1; then
87 # can't use die(), because it wraps message() which wraps this function
88 echo "$THIS_PACKAGE $THIS_SCRIPT error: reject_nondigits() encountered" \
89 "possibly malicious garbage \"$1\"" >&2
90 exit $SHELL_LIB_THROWN_ERROR
96 reject_whitespace () {
97 # syntax: reject_whitespace [ operand ]
99 # scan operand (typically a shell variable whose value cannot be trusted) for
100 # whitespace characters and barf if any are found
102 # does the operand contain any whitespace?
103 if expr "$1" : "[[:space:]]" > /dev/null 2>&1; then
104 # can't use die(), because I want to avoid forward references
105 echo "$THIS_PACKAGE $THIS_SCRIPT error: reject_whitespace() encountered" \
106 "possibly malicious garbage \"$1\"" >&2
107 exit $SHELL_LIB_THROWN_ERROR
112 reject_unlikely_path_chars () {
113 # syntax: reject_unlikely_path_chars [ operand ... ]
115 # scan operands (typically shell variables whose values cannot be trusted) for
116 # characters unlikely to be seen in a path and which the shell might
117 # interpret and barf if any are found
118 while [ -n "$1" ]; do
119 # does the operand contain any funny characters?
120 if expr "$1" : '.*[!$&()*;<>?|].*' > /dev/null 2>&1; then
121 # can't use die(), because I want to avoid forward references
122 echo "$THIS_PACKAGE $THIS_SCRIPT error: reject_unlikely_path_chars()" \
123 "encountered possibly malicious garbage \"$1\"" >&2
124 exit $SHELL_LIB_THROWN_ERROR
130 # Query the terminal to establish a default number of columns to use for
131 # displaying messages to the user. This is used only as a fallback in the
132 # event the COLUMNS variable is not set. ($COLUMNS can react to SIGWINCH while
133 # the script is running, and this cannot, only being calculated once.)
134 DEFCOLUMNS=$(stty size 2> /dev/null | awk '{print $2}') || true
135 if ! expr "$DEFCOLUMNS" : "[[:digit:]]\+$" > /dev/null 2>&1; then
140 # pretty-print messages of arbitrary length
141 reject_nondigits "$COLUMNS"
142 echo "$*" | fmt -t -w ${COLUMNS:-$DEFCOLUMNS} >&2
146 # syntax: observe message ...
148 # issue observational message suitable for logging someday when support for
150 if [ -n "$DEBUG_XORG_PACKAGE" ]; then
151 message "$THIS_PACKAGE $THIS_SCRIPT note: $*"
156 # syntax: warn message ...
158 # issue warning message suitable for logging someday when support for
159 # it exists in dpkg; also send to standard error
160 message "$THIS_PACKAGE $THIS_SCRIPT warning: $*"
164 # syntax: die message ...
166 # exit script with error message
167 message "$THIS_PACKAGE $THIS_SCRIPT error: $*"
168 exit $SHELL_LIB_THROWN_ERROR
172 # exit script with error; essentially a "THIS SHOULD NEVER HAPPEN" message
173 message "internal error: $*"
174 if [ -n "$OFFICIAL_BUILD" ]; then
175 message "Please report a bug in the $THIS_SCRIPT script of the" \
176 "$THIS_PACKAGE package, version $SOURCE_VERSION to the Debian Bug" \
177 "Tracking System. Include all messages above that mention the" \
178 "$THIS_PACKAGE package. Visit " \
179 "<http://www.debian.org/Bugs/Reporting> on the World Wide Web for" \
180 "instructions, read the file" \
181 "/usr/share/doc/debian/bug-reporting.txt from the doc-debian" \
182 "package, or install the reportbug package and use the command of" \
183 "the same name to file a report."
185 exit $SHELL_LIB_INTERNAL_ERROR
189 message "usage error: $*"
190 message "Please report a bug in the $THIS_SCRIPT script of the" \
191 "$THIS_PACKAGE package, version $SOURCE_VERSION to the Debian Bug" \
192 "Tracking System. Include all messages above that mention the" \
193 "$THIS_PACKAGE package. Visit " \
194 "<http://www.debian.org/Bugs/Reporting> on the World Wide Web for" \
195 "instructions, read the file" \
196 "/usr/share/doc/debian/bug-reporting.txt from the doc-debian" \
197 "package, or install the reportbug package and use the command of" \
198 "the same name to file a report."
199 exit $SHELL_LIB_USAGE_ERROR
204 # returns what symlink should point to; i.e., what the "sane" answer is
205 # Keep this in sync with the debian/*.links files.
206 # This is only needed for symlinks to directories.
208 # XXX: Most of these look wrong in the X11R7 world and need to be fixed.
209 # If we've stopped using this function, fixing it might enable us to re-enable
210 # it again and catch more errors.
212 /etc/X11/xkb/compiled) echo /var/lib/xkb ;;
213 /etc/X11/xkb/xkbcomp) echo /usr/X11R6/bin/xkbcomp ;;
214 /usr/X11R6/lib/X11/app-defaults) echo /etc/X11/app-defaults ;;
215 /usr/X11R6/lib/X11/fs) echo /etc/X11/fs ;;
216 /usr/X11R6/lib/X11/lbxproxy) echo /etc/X11/lbxproxy ;;
217 /usr/X11R6/lib/X11/proxymngr) echo /etc/X11/proxymngr ;;
218 /usr/X11R6/lib/X11/rstart) echo /etc/X11/rstart ;;
219 /usr/X11R6/lib/X11/twm) echo /etc/X11/twm ;;
220 /usr/X11R6/lib/X11/xdm) echo /etc/X11/xdm ;;
221 /usr/X11R6/lib/X11/xinit) echo /etc/X11/xinit ;;
222 /usr/X11R6/lib/X11/xkb) echo /etc/X11/xkb ;;
223 /usr/X11R6/lib/X11/xserver) echo /etc/X11/xserver ;;
224 /usr/X11R6/lib/X11/xsm) echo /etc/X11/xsm ;;
225 /usr/bin/X11) echo ../X11R6/bin ;;
226 /usr/bin/rstartd) echo ../X11R6/bin/rstartd ;;
227 /usr/include/X11) echo ../X11R6/include/X11 ;;
228 /usr/lib/X11) echo ../X11R6/lib/X11 ;;
229 *) internal_error "maplink() called with unknown path \"$1\"" ;;
234 # given a supplied set of pathnames, break each one up by directory and do an
235 # ls -dl on each component, cumulatively; i.e.
236 # analyze_path /usr/X11R6/bin -> ls -dl /usr /usr/X11R6 /usr/X11R6/bin
237 # Thanks to Randolph Chung for this clever hack.
241 while [ -n "$1" ]; do
242 reject_whitespace "$1"
244 message "Analyzing $1:"
245 for f in $(echo "$1" | tr / \ ); do
246 if [ -e /$g$f ]; then
247 ls -dl /$g$f /$g$f.dpkg-* 2> /dev/null || true
250 message "/$g$f: nonexistent; directory contents of /$g:"
260 local f p dpkg_info_dir possible_culprits smoking_guns bad_packages package \
263 reject_whitespace "$1"
264 message "Searching for overlapping packages..."
265 dpkg_info_dir=/var/lib/dpkg/info
266 if [ -d $dpkg_info_dir ]; then
267 if [ "$(echo $dpkg_info_dir/*.list)" != "$dpkg_info_dir/*.list" ]; then
268 possible_culprits=$(ls -1 $dpkg_info_dir/*.list | egrep -v \
269 "(xbase-clients|x11-common|xfs|xlibs)")
270 if [ -n "$possible_culprits" ]; then
271 smoking_guns=$(grep -l "$1" $possible_culprits || true)
272 if [ -n "$smoking_guns" ]; then
273 bad_packages=$(printf "\\n")
274 for f in $smoking_guns; do
275 # too bad you can't nest parameter expansion voodoo
276 p=${f%*.list} # strip off the trailing ".list"
277 package=${p##*/} # strip off the directories
278 bad_packages=$(printf "%s\n%s" "$bad_packages" "$package")
281 The following packages appear to have file overlaps with the X.Org packages;
282 these packages are either very old, or in violation of Debian Policy. Try
283 upgrading each of these packages to the latest available version if possible:
284 for example, with the command "apt-get install". If no newer version of a
285 package is available, you will have to remove it; for example, with the command
286 "apt-get remove". If even the latest available version of the package has
287 this file overlap, please file a bug against that package with the Debian Bug
288 Tracking System. You may want to refer the package maintainer to section 12.8
289 of the Debian Policy manual.
293 message "The overlapping packages are: $bad_packages"
295 message "no overlaps found."
299 message "cannot search; no matches for $dpkg_info_dir/*.list."
302 message "cannot search; $dpkg_info_dir does not exist."
307 # syntax: check_symlink symlink
309 # See if specified symlink points where it is supposed to. Return 0 if it
310 # does, and 1 if it does not.
312 # Primarily used by check_symlinks_and_warn() and check_symlinks_and_bomb().
317 if [ $# -ne 1 ]; then
318 usage_error "check_symlink() called with wrong number of arguments;" \
320 exit $SHELL_LIB_USAGE_ERROR
325 if [ "$(maplink "$symlink")" = "$(readlink "$symlink")" ]; then
332 check_symlinks_and_warn () {
333 # syntax: check_symlinks_and_warn symlink ...
335 # For each argument, check for symlink sanity, and warn if it isn't sane.
337 # Call this function from a preinst script in the event $1 is "upgrade" or
343 if [ $# -lt 1 ]; then
344 usage_error "check_symlinks_and_warn() called with wrong number of" \
345 "arguments; expected at least 1, got $#"
346 exit $SHELL_LIB_USAGE_ERROR
349 while [ -n "$1" ]; do
351 if [ -L "$symlink" ]; then
352 if ! check_symlink "$symlink"; then
353 observe "$symlink symbolic link points to wrong location" \
354 "$(readlink "$symlink"); removing"
357 elif [ -e "$symlink" ]; then
358 errmsg="$symlink exists and is not a symbolic link; this package cannot"
359 errmsg="$errmsg be installed until this"
360 if [ -f "$symlink" ]; then
361 errmsg="$errmsg file"
362 elif [ -d "$symlink" ]; then
363 errmsg="$errmsg directory"
365 errmsg="$errmsg thing"
367 errmsg="$errmsg is removed"
374 check_symlinks_and_bomb () {
375 # syntax: check_symlinks_and_bomb symlink ...
377 # For each argument, check for symlink sanity, and bomb if it isn't sane.
379 # Call this function from a postinst script.
381 local problem symlink
384 if [ $# -lt 1 ]; then
385 usage_error "check_symlinks_and_bomb() called with wrong number of"
386 "arguments; expected at least 1, got $#"
387 exit $SHELL_LIB_USAGE_ERROR
390 while [ -n "$1" ]; do
393 if [ -L "$symlink" ]; then
394 if ! check_symlink "$symlink"; then
396 warn "$symlink symbolic link points to wrong location" \
397 "$(readlink "$symlink")"
399 elif [ -e "$symlink" ]; then
401 warn "$symlink is not a symbolic link"
404 warn "$symlink symbolic link does not exist"
406 if [ -n "$problem" ]; then
407 analyze_path "$symlink" "$(readlink "$symlink")"
408 find_culprits "$symlink"
409 die "bad symbolic links on system"
416 # run $UPDATECMDS in $FONTDIRS
418 local dir cmd shortcmd x_font_dir_prefix
420 x_font_dir_prefix="/usr/share/fonts/X11"
422 if [ -z "$UPDATECMDS" ]; then
423 usage_error "font_update() called but \$UPDATECMDS not set"
425 if [ -z "$FONTDIRS" ]; then
426 usage_error "font_update() called but \$FONTDIRS not set"
429 reject_unlikely_path_chars "$UPDATECMDS"
430 reject_unlikely_path_chars "$FONTDIRS"
432 for dir in $FONTDIRS; do
433 if [ -d "$x_font_dir_prefix/$dir" ]; then
434 for cmd in $UPDATECMDS; do
435 if which "$cmd" > /dev/null 2>&1; then
437 observe "running $shortcmd in $dir font directory"
439 if [ "$shortcmd" = "update-fonts-alias" ]; then
440 cmd_opts=--x11r7-layout
442 if [ "$shortcmd" = "update-fonts-dir" ]; then
443 cmd_opts=--x11r7-layout
445 if [ "$shortcmd" = "update-fonts-scale" ]; then
446 cmd_opts=--x11r7-layout
448 $cmd $cmd_opts $dir || warn "$cmd $cmd_opts $dir" \
449 "failed; font directory data may not" \
452 warn "$cmd not found; not updating corresponding $dir font" \
457 warn "$dir is not a directory; not updating font directory data"
462 remove_conffile_prepare () {
463 # syntax: remove_conffile_prepare filename official_md5sum ...
465 # Check a conffile "filename" against a list of canonical MD5 checksums.
466 # If the file's current MD5 checksum matches one of the "official_md5sum"
467 # operands provided, then prepare the conffile for removal from the system.
468 # We defer actual deletion until the package is configured so that we can
469 # roll this operation back if package installation fails.
471 # Call this function from a preinst script in the event $1 is "upgrade" or
472 # "install" and verify $2 to ensure the package is being upgraded from a
473 # version (or installed over a version removed-but-not-purged) prior to the
474 # one in which the conffile was obsoleted.
476 local conffile current_checksum
479 if [ $# -lt 2 ]; then
480 usage_error "remove_conffile_prepare() called with wrong number of" \
481 "arguments; expected at least 2, got $#"
482 exit $SHELL_LIB_USAGE_ERROR
488 # does the conffile even exist?
489 if [ -e "$conffile" ]; then
490 # calculate its checksum
491 current_checksum=$(md5sum < "$conffile" | sed 's/[[:space:]].*//')
492 # compare it to each supplied checksum
493 while [ -n "$1" ]; do
494 if [ "$current_checksum" = "$1" ]; then
495 # we found a match; move the confffile and stop looking
496 observe "preparing obsolete conffile $conffile for removal"
497 mv "$conffile" "$conffile.$THIS_PACKAGE-tmp"
505 remove_conffile_lookup () {
506 # syntax: remove_conffile_lookup package filename
508 # Lookup the md5sum of a conffile in dpkg's database, and prepare for removal
509 # if it matches the actual file's md5sum.
511 # Call this function when you would call remove_conffile_prepare but only
512 # want to check against dpkg's status database instead of known checksums.
514 local package conffile old_md5sum
517 if [ $# -ne 2 ]; then
518 usage_error "remove_conffile_lookup() called with wrong number of" \
519 "arguments; expected 1, got $#"
520 exit $SHELL_LIB_USAGE_ERROR
526 if ! [ -e "$conffile" ]; then
529 old_md5sum="$(dpkg-query -W -f='${Conffiles}' "$package" | \
530 awk '{ if (match($0, "^ '"$conffile"' ")) print $2}')"
531 if [ -n "$old_md5sum" ]; then
532 remove_conffile_prepare "$conffile" "$old_md5sum"
536 remove_conffile_commit () {
537 # syntax: remove_conffile_commit filename
539 # Complete the removal of a conffile "filename" that has become obsolete.
541 # Call this function from a postinst script after having used
542 # remove_conffile_prepare() in the preinst.
547 if [ $# -ne 1 ]; then
548 usage_error "remove_conffile_commit() called with wrong number of" \
549 "arguments; expected 1, got $#"
550 exit $SHELL_LIB_USAGE_ERROR
555 # if the temporary file created by remove_conffile_prepare() exists, remove it
556 if [ -e "$conffile.$THIS_PACKAGE-tmp" ]; then
557 observe "committing removal of obsolete conffile $conffile"
558 rm "$conffile.$THIS_PACKAGE-tmp"
562 remove_conffile_rollback () {
563 # syntax: remove_conffile_rollback filename
565 # Roll back the removal of a conffile "filename".
567 # Call this function from a postrm script in the event $1 is "abort-upgrade"
568 # or "abort-install" is after having used remove_conffile_prepare() in the
574 if [ $# -ne 1 ]; then
575 usage_error "remove_conffile_rollback() called with wrong number of" \
576 "arguments; expected 1, got $#"
577 exit $SHELL_LIB_USAGE_ERROR
582 # if the temporary file created by remove_conffile_prepare() exists, move it
584 if [ -e "$conffile.$THIS_PACKAGE-tmp" ]; then
585 observe "rolling back removal of obsolete conffile $conffile"
586 mv "$conffile.$THIS_PACKAGE-tmp" "$conffile"
590 replace_conffile_with_symlink_prepare () {
591 # syntax: replace_conffile_with_symlink_prepare oldfilename newfilename \
592 # official_md5sum ...
594 # Check a conffile "oldfilename" against a list of canonical MD5 checksums.
595 # If the file's current MD5 checksum matches one of the "official_md5sum"
596 # operands provided, then prepare the conffile for removal from the system.
597 # We defer actual deletion until the package is configured so that we can
598 # roll this operation back if package installation fails. Otherwise copy it
599 # to newfilename and let dpkg handle it through conffiles mechanism.
601 # Call this function from a preinst script in the event $1 is "upgrade" or
602 # "install" and verify $2 to ensure the package is being upgraded from a
603 # version (or installed over a version removed-but-not-purged) prior to the
604 # one in which the conffile was obsoleted.
606 local conffile current_checksum
609 if [ $# -lt 3 ]; then
610 usage_error "replace_conffile_with_symlink_prepare() called with wrong" \
611 " number of arguments; expected at least 3, got $#"
612 exit $SHELL_LIB_USAGE_ERROR
620 remove_conffile_prepare "$_oldconffile" "$@"
621 # If $oldconffile still exists, then md5sums didn't match.
622 # Copy it to new one.
623 if [ -f "$oldconffile" ]; then
624 cp "$oldconffile" "$newconffile"
629 replace_conffile_with_symlink_commit () {
630 # syntax: replace_conffile_with_symlink_commit oldfilename
632 # Complete the removal of a conffile "oldfilename" that has been
633 # replaced by a symlink.
635 # Call this function from a postinst script after having used
636 # replace_conffile_with_symlink_prepare() in the preinst.
641 if [ $# -ne 1 ]; then
642 usage_error "replace_conffile_with_symlink_commit() called with wrong" \
643 "number of arguments; expected 1, got $#"
644 exit $SHELL_LIB_USAGE_ERROR
649 remove_conffile_commit "$conffile"
652 replace_conffile_with_symlink_rollback () {
653 # syntax: replace_conffile_with_symlink_rollback oldfilename newfilename
655 # Roll back the replacing of a conffile "oldfilename" with symlink to
658 # Call this function from a postrm script in the event $1 is "abort-upgrade"
659 # or "abort-install" and verify $2 to ensure the package failed to upgrade
660 # from a version (or install over a version removed-but-not-purged) prior
661 # to the one in which the conffile was obsoleted.
662 # You should have used replace_conffile_with_symlink_prepare() in the
668 if [ $# -ne 2 ]; then
669 usage_error "replace_conffile_with_symlink_rollback() called with wrong" \
670 "number of arguments; expected 2, got $#"
671 exit $SHELL_LIB_USAGE_ERROR
677 remove_conffile_rollback "$_oldconffile"
678 if [ -f "$newconffile" ]; then
684 # syntax: run command [ argument ... ]
686 # Run specified command with optional arguments and report its exit status.
687 # Useful for commands whose exit status may be nonzero, but still acceptable,
688 # or commands whose failure is not fatal to us.
690 # NOTE: Do *not* use this function with db_get or db_metaget commands; in
691 # those cases the return value of the debconf command *must* be checked
692 # before the string returned by debconf is used for anything.
697 if [ $# -lt 1 ]; then
698 usage_error "run() called with wrong number of arguments; expected at" \
700 exit $SHELL_LIB_USAGE_ERROR
705 if [ ${retval:-0} -ne 0 ]; then
706 observe "command \"$*\" exited with status $retval"
710 make_symlink_sane () {
711 # syntax: make_symlink_sane symlink target
713 # Ensure that the symbolic link symlink exists, and points to target.
715 # If symlink does not exist, create it and point it at target.
717 # If symlink exists but is not a symbolic link, back it up.
719 # If symlink exists, is a symbolic link, but points to the wrong location, fix
722 # If symlink exists, is a symbolic link, and already points to target, do
725 # This function wouldn't be needed if ln had an -I, --idempotent option.
727 # Validate arguments.
728 if [ $# -ne 2 ]; then
729 usage_error "make_symlink_sane() called with wrong number of arguments;" \
731 exit $SHELL_LIB_USAGE_ERROR
734 # We could just use the positional parameters as-is, but that makes things
741 if [ -L "$symlink" ] && [ "$(readlink "$symlink")" = "$target" ]; then
742 observe "link from $symlink to $target already exists"
744 observe "creating symbolic link from $symlink to $target"
745 mkdir -p "${target%/*}" "${symlink%/*}"
746 ln -s -b -S ".dpkg-old" "$target" "$symlink"
750 migrate_dir_to_symlink () {
751 # syntax: migrate_dir_to_symlink old_location new_location
753 # Per Debian Policy section 6.5.4, "A directory will never be replaced by a
754 # symbolic link to a directory or vice versa; instead, the existing state
755 # (symlink or not) will be left alone and dpkg will follow the symlink if
758 # We have to do it ourselves.
760 # This function moves the contents of old_location, a directory, into
761 # new_location, a directory, then makes old_location a symbolic link to
764 # old_location need not exist, but if it does, it must be a directory (or a
765 # symlink to a directory). If it is not, it is backed up. If new_location
766 # exists already and is not a directory, it is backed up.
768 # This function should be called from a package's preinst so that other
769 # packages unpacked after this one --- but before this package's postinst runs
770 # --- are unpacked into new_location even if their payloads contain
771 # old_location filespecs.
773 # Validate arguments.
774 if [ $# -ne 2 ]; then
775 usage_error "migrate_dir_to_symlink() called with wrong number of"
776 "arguments; expected 2, got $#"
777 exit $SHELL_LIB_USAGE_ERROR
780 # We could just use the positional parameters as-is, but that makes things
787 # Is old location a symlink?
788 if [ -L "$old" ]; then
789 # Does it already point to new location?
790 if [ "$(readlink "$old")" = "$new" ]; then
791 # Nothing to do; migration has already been done.
792 observe "migration of $old to $new already done"
796 warn "backing up symbolic link $old as $old.dpkg-old"
797 mv -b "$old" "$old.dpkg-old"
801 # Does old location exist, but is not a directory?
802 if [ -e "$old" ] && ! [ -d "$old" ]; then
804 warn "backing up non-directory $old as $old.dpkg-old"
805 mv -b "$old" "$old.dpkg-old"
808 observe "migrating $old to $new"
810 # Is new location a symlink?
811 if [ -L "$new" ]; then
812 # Does it point the wrong way, i.e., back to where we're migrating from?
813 if [ "$(readlink "$new")" = "$old" ]; then
815 observe "removing symbolic link $new which points to $old"
819 warn "backing up symbolic link $new as $new.dpkg-old"
820 mv -b "$new" "$new.dpkg-old"
824 # Does new location exist, but is not a directory?
825 if [ -e "$new" ] && ! [ -d "$new" ]; then
826 warn "backing up non-directory $new as $new.dpkg-old"
827 mv -b "$new" "$new.dpkg-old"
830 # Create new directory if it does not yet exist.
831 if ! [ -e "$new" ]; then
832 observe "creating $new"
836 # Copy files in old location to new location. Back up any filenames that
837 # already exist in the new location with the extension ".dpkg-old".
838 observe "copying files from $old to $new"
839 if ! (cd "$old" && cp -a -b -S ".dpkg-old" . "$new"); then
840 die "error(s) encountered while copying files from $old to $new"
843 # Remove files at old location.
844 observe "removing $old"
847 # Create symlink from old location to new location.
848 make_symlink_sane "$old" "$new"
851 # vim:set ai et sw=2 ts=2 tw=80:
853 # GOBSTOPPER: The X Strike Force shell library ends here.