623 lines
20 KiB
Bash
623 lines
20 KiB
Bash
# This is the X Strike Force shell library for X Window System package
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# maintainer scripts. It serves to define shell functions commonly used by
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# such packages, and performs some error checking necessary for proper operation
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# of those functions. By itself, it does not "do" much; the maintainer scripts
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# invoke the functions defined here to accomplish package installation and
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# removal tasks.
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# If you are reading this within a Debian package maintainer script (e.g.,
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# /var/lib/dpkg/info/PACKAGE.{config,preinst,postinst,prerm,postrm}), you can
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# skip past this library by scanning forward in this file to the string
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# "GOBSTOPPER".
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SOURCE_VERSION=@SOURCE_VERSION@
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OFFICIAL_BUILD=@OFFICIAL_BUILD@
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# Use special abnormal exit codes so that problems with this library are more
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# easily tracked down.
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SHELL_LIB_INTERNAL_ERROR=86
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SHELL_LIB_THROWN_ERROR=74
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SHELL_LIB_USAGE_ERROR=99
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# old -> new variable names
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if [ -z "$DEBUG_XORG_PACKAGE" ] && [ -n "$DEBUG_XFREE86_PACKAGE" ]; then
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DEBUG_XORG_PACKAGE="$DEBUG_XFREE86_PACKAGE"
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fi
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if [ -z "$DEBUG_XORG_DEBCONF" ] && [ -n "$DEBUG_XFREE86_DEBCONF" ]; then
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DEBUG_XORG_DEBCONF="$DEBUG_XFREE86_DEBCONF"
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fi
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# initial sanity checks
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if [ -z "$THIS_PACKAGE" ]; then
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cat >&2 <<EOF
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Error: package maintainer script attempted to use shell library without
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definining \$THIS_PACKAGE shell variable. Please report the package name,
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version, and the text of this error message to the Debian Bug Tracking System.
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Visit <http://www.debian.org/Bugs/Reporting> on the World Wide Web for
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instructions, read the file /usr/share/doc/debian/bug-reporting.txt from the
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"doc-debian" package, or install the "reportbug" package and use the command of
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the same name to file a report against version $SOURCE_VERSION of this package.
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EOF
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exit $SHELL_LIB_USAGE_ERROR
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fi
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if [ -z "$THIS_SCRIPT" ]; then
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cat >&2 <<EOF
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Error: package maintainer script attempted to use shell library without
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definining \$THIS_SCRIPT shell variable. Please report the package name,
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version, and the text of this error message to the Debian Bug Tracking System.
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Visit <http://www.debian.org/Bugs/Reporting> on the World Wide Web for
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instructions, read the file /usr/share/doc/debian/bug-reporting.txt from the
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"doc-debian" package, or install the "reportbug" package and use the command of
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the same name to file a report against version $SOURCE_VERSION of the
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"$THIS_PACKAGE" package.
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EOF
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exit $SHELL_LIB_USAGE_ERROR
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fi
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if [ "$1" = "reconfigure" ] || [ -n "$DEBCONF_RECONFIGURE" ]; then
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RECONFIGURE="true"
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else
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RECONFIGURE=
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fi
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if ([ "$1" = "install" ] || [ "$1" = "configure" ]) && [ -z "$2" ]; then
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FIRSTINST="yes"
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fi
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if [ -z "$RECONFIGURE" ] && [ -z "$FIRSTINST" ]; then
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UPGRADE="yes"
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fi
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trap "message;\
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message \"Received signal. Aborting $THIS_PACKAGE package $THIS_SCRIPT script.\";\
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message;\
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exit 1" HUP INT QUIT TERM
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reject_nondigits () {
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# syntax: reject_nondigits [ operand ... ]
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#
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# scan operands (typically shell variables whose values cannot be trusted) for
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# characters other than decimal digits and barf if any are found
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while [ -n "$1" ]; do
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# does the operand contain anything but digits?
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if ! expr "$1" : "[[:digit:]]\+$" > /dev/null 2>&1; then
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# can't use die(), because it wraps message() which wraps this function
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echo "$THIS_PACKAGE $THIS_SCRIPT error: reject_nondigits() encountered" \
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"possibly malicious garbage \"$1\"" >&2
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exit $SHELL_LIB_THROWN_ERROR
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fi
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shift
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done
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}
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reject_unlikely_path_chars () {
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# syntax: reject_unlikely_path_chars [ operand ... ]
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#
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# scan operands (typically shell variables whose values cannot be trusted) for
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# characters unlikely to be seen in a path and which the shell might
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# interpret and barf if any are found
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while [ -n "$1" ]; do
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# does the operand contain any funny characters?
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if expr "$1" : '.*[!$&()*;<>?|].*' > /dev/null 2>&1; then
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# can't use die(), because I want to avoid forward references
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echo "$THIS_PACKAGE $THIS_SCRIPT error: reject_unlikely_path_chars()" \
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"encountered possibly malicious garbage \"$1\"" >&2
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exit $SHELL_LIB_THROWN_ERROR
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fi
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shift
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done
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}
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# Query the terminal to establish a default number of columns to use for
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# displaying messages to the user. This is used only as a fallback in the
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# event the COLUMNS variable is not set. ($COLUMNS can react to SIGWINCH while
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# the script is running, and this cannot, only being calculated once.)
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DEFCOLUMNS=$(stty size 2> /dev/null | awk '{print $2}') || true
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if ! expr "$DEFCOLUMNS" : "[[:digit:]]\+$" > /dev/null 2>&1; then
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DEFCOLUMNS=80
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fi
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message () {
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# pretty-print messages of arbitrary length
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reject_nondigits "$COLUMNS"
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echo "$*" | fmt -t -w ${COLUMNS:-$DEFCOLUMNS} >&2
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}
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observe () {
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# syntax: observe message ...
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#
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# issue observational message suitable for logging someday when support for
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# it exists in dpkg
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if [ -n "$DEBUG_XORG_PACKAGE" ]; then
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message "$THIS_PACKAGE $THIS_SCRIPT note: $*"
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fi
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}
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warn () {
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# syntax: warn message ...
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#
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# issue warning message suitable for logging someday when support for
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# it exists in dpkg; also send to standard error
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message "$THIS_PACKAGE $THIS_SCRIPT warning: $*"
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}
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die () {
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# syntax: die message ...
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#
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# exit script with error message
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message "$THIS_PACKAGE $THIS_SCRIPT error: $*"
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exit $SHELL_LIB_THROWN_ERROR
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}
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internal_error () {
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# exit script with error; essentially a "THIS SHOULD NEVER HAPPEN" message
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message "internal error: $*"
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if [ -n "$OFFICIAL_BUILD" ]; then
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message "Please report a bug in the $THIS_SCRIPT script of the" \
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"$THIS_PACKAGE package, version $SOURCE_VERSION to the Debian Bug" \
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"Tracking System. Include all messages above that mention the" \
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"$THIS_PACKAGE package. Visit " \
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"<http://www.debian.org/Bugs/Reporting> on the World Wide Web for" \
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"instructions, read the file" \
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"/usr/share/doc/debian/bug-reporting.txt from the doc-debian" \
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"package, or install the reportbug package and use the command of" \
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"the same name to file a report."
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fi
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exit $SHELL_LIB_INTERNAL_ERROR
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}
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usage_error () {
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message "usage error: $*"
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message "Please report a bug in the $THIS_SCRIPT script of the" \
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"$THIS_PACKAGE package, version $SOURCE_VERSION to the Debian Bug" \
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"Tracking System. Include all messages above that mention the" \
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"$THIS_PACKAGE package. Visit " \
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"<http://www.debian.org/Bugs/Reporting> on the World Wide Web for" \
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"instructions, read the file" \
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"/usr/share/doc/debian/bug-reporting.txt from the doc-debian" \
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"package, or install the reportbug package and use the command of" \
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"the same name to file a report."
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exit $SHELL_LIB_USAGE_ERROR
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}
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font_update () {
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# run $UPDATECMDS in $FONTDIRS
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local dir cmd shortcmd x_font_dir_prefix
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x_font_dir_prefix="/usr/share/fonts/X11"
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if [ -z "$UPDATECMDS" ]; then
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usage_error "font_update() called but \$UPDATECMDS not set"
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fi
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if [ -z "$FONTDIRS" ]; then
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usage_error "font_update() called but \$FONTDIRS not set"
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fi
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reject_unlikely_path_chars "$UPDATECMDS"
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reject_unlikely_path_chars "$FONTDIRS"
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for dir in $FONTDIRS; do
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if [ -d "$x_font_dir_prefix/$dir" ]; then
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for cmd in $UPDATECMDS; do
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if which "$cmd" > /dev/null 2>&1; then
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shortcmd=${cmd##*/}
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observe "running $shortcmd in $dir font directory"
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cmd_opts=
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if [ "$shortcmd" = "update-fonts-alias" ]; then
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cmd_opts=--x11r7-layout
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fi
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if [ "$shortcmd" = "update-fonts-dir" ]; then
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cmd_opts=--x11r7-layout
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fi
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if [ "$shortcmd" = "update-fonts-scale" ]; then
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cmd_opts=--x11r7-layout
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fi
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$cmd $cmd_opts $dir || warn "$cmd $cmd_opts $dir" \
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"failed; font directory data may not" \
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"be up to date"
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else
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warn "$cmd not found; not updating corresponding $dir font" \
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"directory data"
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fi
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done
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else
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warn "$dir is not a directory; not updating font directory data"
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fi
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done
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}
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remove_conffile_prepare () {
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# syntax: remove_conffile_prepare filename official_md5sum ...
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#
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# Check a conffile "filename" against a list of canonical MD5 checksums.
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# If the file's current MD5 checksum matches one of the "official_md5sum"
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# operands provided, then prepare the conffile for removal from the system.
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# We defer actual deletion until the package is configured so that we can
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# roll this operation back if package installation fails.
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#
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# Call this function from a preinst script in the event $1 is "upgrade" or
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# "install" and verify $2 to ensure the package is being upgraded from a
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# version (or installed over a version removed-but-not-purged) prior to the
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# one in which the conffile was obsoleted.
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local conffile current_checksum
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# validate arguments
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if [ $# -lt 2 ]; then
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usage_error "remove_conffile_prepare() called with wrong number of" \
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"arguments; expected at least 2, got $#"
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exit $SHELL_LIB_USAGE_ERROR
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fi
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conffile="$1"
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shift
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# does the conffile even exist?
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if [ -e "$conffile" ]; then
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# calculate its checksum
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current_checksum=$(md5sum < "$conffile" | sed 's/[[:space:]].*//')
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# compare it to each supplied checksum
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while [ -n "$1" ]; do
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if [ "$current_checksum" = "$1" ]; then
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# we found a match; move the confffile and stop looking
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observe "preparing obsolete conffile $conffile for removal"
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mv "$conffile" "$conffile.$THIS_PACKAGE-tmp"
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break
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fi
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shift
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done
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fi
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}
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remove_conffile_lookup () {
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# syntax: remove_conffile_lookup package filename
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#
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# Lookup the md5sum of a conffile in dpkg's database, and prepare for removal
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# if it matches the actual file's md5sum.
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#
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# Call this function when you would call remove_conffile_prepare but only
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# want to check against dpkg's status database instead of known checksums.
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local package conffile old_md5sum
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# validate arguments
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if [ $# -ne 2 ]; then
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usage_error "remove_conffile_lookup() called with wrong number of" \
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"arguments; expected 1, got $#"
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exit $SHELL_LIB_USAGE_ERROR
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fi
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package="$1"
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conffile="$2"
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if ! [ -e "$conffile" ]; then
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return
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fi
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old_md5sum="$(dpkg-query -W -f='${Conffiles}' "$package" | \
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awk '{ if (match($0, "^ '"$conffile"' ")) print $2}')"
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if [ -n "$old_md5sum" ]; then
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remove_conffile_prepare "$conffile" "$old_md5sum"
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fi
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}
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remove_conffile_commit () {
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# syntax: remove_conffile_commit filename
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#
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# Complete the removal of a conffile "filename" that has become obsolete.
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#
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# Call this function from a postinst script after having used
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# remove_conffile_prepare() in the preinst.
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local conffile
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# validate arguments
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if [ $# -ne 1 ]; then
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usage_error "remove_conffile_commit() called with wrong number of" \
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"arguments; expected 1, got $#"
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exit $SHELL_LIB_USAGE_ERROR
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fi
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conffile="$1"
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# if the temporary file created by remove_conffile_prepare() exists, remove it
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if [ -e "$conffile.$THIS_PACKAGE-tmp" ]; then
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observe "committing removal of obsolete conffile $conffile"
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rm "$conffile.$THIS_PACKAGE-tmp"
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fi
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}
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remove_conffile_rollback () {
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# syntax: remove_conffile_rollback filename
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#
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# Roll back the removal of a conffile "filename".
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#
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# Call this function from a postrm script in the event $1 is "abort-upgrade"
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# or "abort-install" is after having used remove_conffile_prepare() in the
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# preinst.
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local conffile
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# validate arguments
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if [ $# -ne 1 ]; then
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usage_error "remove_conffile_rollback() called with wrong number of" \
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"arguments; expected 1, got $#"
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exit $SHELL_LIB_USAGE_ERROR
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fi
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conffile="$1"
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# if the temporary file created by remove_conffile_prepare() exists, move it
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# back
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if [ -e "$conffile.$THIS_PACKAGE-tmp" ]; then
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observe "rolling back removal of obsolete conffile $conffile"
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mv "$conffile.$THIS_PACKAGE-tmp" "$conffile"
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fi
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}
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replace_conffile_with_symlink_prepare () {
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# syntax: replace_conffile_with_symlink_prepare oldfilename newfilename \
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# official_md5sum ...
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#
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# Check a conffile "oldfilename" against a list of canonical MD5 checksums.
|
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# If the file's current MD5 checksum matches one of the "official_md5sum"
|
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# operands provided, then prepare the conffile for removal from the system.
|
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# We defer actual deletion until the package is configured so that we can
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# roll this operation back if package installation fails. Otherwise copy it
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# to newfilename and let dpkg handle it through conffiles mechanism.
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#
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# Call this function from a preinst script in the event $1 is "upgrade" or
|
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# "install" and verify $2 to ensure the package is being upgraded from a
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# version (or installed over a version removed-but-not-purged) prior to the
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# one in which the conffile was obsoleted.
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local conffile current_checksum
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|
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# validate arguments
|
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if [ $# -lt 3 ]; then
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usage_error "replace_conffile_with_symlink_prepare() called with wrong" \
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" number of arguments; expected at least 3, got $#"
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exit $SHELL_LIB_USAGE_ERROR
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fi
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oldconffile="$1"
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shift
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newconffile="$1"
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shift
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|
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remove_conffile_prepare "$_oldconffile" "$@"
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# If $oldconffile still exists, then md5sums didn't match.
|
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# Copy it to new one.
|
|
if [ -f "$oldconffile" ]; then
|
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cp "$oldconffile" "$newconffile"
|
|
fi
|
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|
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}
|
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|
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replace_conffile_with_symlink_commit () {
|
|
# syntax: replace_conffile_with_symlink_commit oldfilename
|
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#
|
|
# Complete the removal of a conffile "oldfilename" that has been
|
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# replaced by a symlink.
|
|
#
|
|
# Call this function from a postinst script after having used
|
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# replace_conffile_with_symlink_prepare() in the preinst.
|
|
|
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local conffile
|
|
|
|
# validate arguments
|
|
if [ $# -ne 1 ]; then
|
|
usage_error "replace_conffile_with_symlink_commit() called with wrong" \
|
|
"number of arguments; expected 1, got $#"
|
|
exit $SHELL_LIB_USAGE_ERROR
|
|
fi
|
|
|
|
conffile="$1"
|
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|
|
remove_conffile_commit "$conffile"
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}
|
|
|
|
replace_conffile_with_symlink_rollback () {
|
|
# syntax: replace_conffile_with_symlink_rollback oldfilename newfilename
|
|
#
|
|
# Roll back the replacing of a conffile "oldfilename" with symlink to
|
|
# "newfilename".
|
|
#
|
|
# Call this function from a postrm script in the event $1 is "abort-upgrade"
|
|
# or "abort-install" and verify $2 to ensure the package failed to upgrade
|
|
# from a version (or install over a version removed-but-not-purged) prior
|
|
# to the one in which the conffile was obsoleted.
|
|
# You should have used replace_conffile_with_symlink_prepare() in the
|
|
# preinst.
|
|
|
|
local conffile
|
|
|
|
# validate arguments
|
|
if [ $# -ne 2 ]; then
|
|
usage_error "replace_conffile_with_symlink_rollback() called with wrong" \
|
|
"number of arguments; expected 2, got $#"
|
|
exit $SHELL_LIB_USAGE_ERROR
|
|
fi
|
|
|
|
oldconffile="$1"
|
|
newconffile="$2"
|
|
|
|
remove_conffile_rollback "$_oldconffile"
|
|
if [ -f "$newconffile" ]; then
|
|
rm "$newconffile"
|
|
fi
|
|
}
|
|
|
|
run () {
|
|
# syntax: run command [ argument ... ]
|
|
#
|
|
# Run specified command with optional arguments and report its exit status.
|
|
# Useful for commands whose exit status may be nonzero, but still acceptable,
|
|
# or commands whose failure is not fatal to us.
|
|
#
|
|
# NOTE: Do *not* use this function with db_get or db_metaget commands; in
|
|
# those cases the return value of the debconf command *must* be checked
|
|
# before the string returned by debconf is used for anything.
|
|
|
|
local retval
|
|
|
|
# validate arguments
|
|
if [ $# -lt 1 ]; then
|
|
usage_error "run() called with wrong number of arguments; expected at" \
|
|
"least 1, got $#"
|
|
exit $SHELL_LIB_USAGE_ERROR
|
|
fi
|
|
|
|
"$@" || retval=$?
|
|
|
|
if [ ${retval:-0} -ne 0 ]; then
|
|
observe "command \"$*\" exited with status $retval"
|
|
fi
|
|
}
|
|
|
|
make_symlink_sane () {
|
|
# syntax: make_symlink_sane symlink target
|
|
#
|
|
# Ensure that the symbolic link symlink exists, and points to target.
|
|
#
|
|
# If symlink does not exist, create it and point it at target.
|
|
#
|
|
# If symlink exists but is not a symbolic link, back it up.
|
|
#
|
|
# If symlink exists, is a symbolic link, but points to the wrong location, fix
|
|
# it.
|
|
#
|
|
# If symlink exists, is a symbolic link, and already points to target, do
|
|
# nothing.
|
|
#
|
|
# This function wouldn't be needed if ln had an -I, --idempotent option.
|
|
|
|
# Validate arguments.
|
|
if [ $# -ne 2 ]; then
|
|
usage_error "make_symlink_sane() called with wrong number of arguments;" \
|
|
"expected 2, got $#"
|
|
exit $SHELL_LIB_USAGE_ERROR
|
|
fi
|
|
|
|
# We could just use the positional parameters as-is, but that makes things
|
|
# harder to follow.
|
|
local symlink target
|
|
|
|
symlink="$1"
|
|
target="$2"
|
|
|
|
if [ -L "$symlink" ] && [ "$(readlink "$symlink")" = "$target" ]; then
|
|
observe "link from $symlink to $target already exists"
|
|
else
|
|
observe "creating symbolic link from $symlink to $target"
|
|
mkdir -p "${target%/*}" "${symlink%/*}"
|
|
ln -s -b -S ".dpkg-old" "$target" "$symlink"
|
|
fi
|
|
}
|
|
|
|
migrate_dir_to_symlink () {
|
|
# syntax: migrate_dir_to_symlink old_location new_location
|
|
#
|
|
# Per Debian Policy section 6.5.4, "A directory will never be replaced by a
|
|
# symbolic link to a directory or vice versa; instead, the existing state
|
|
# (symlink or not) will be left alone and dpkg will follow the symlink if
|
|
# there is one."
|
|
#
|
|
# We have to do it ourselves.
|
|
#
|
|
# This function moves the contents of old_location, a directory, into
|
|
# new_location, a directory, then makes old_location a symbolic link to
|
|
# new_location.
|
|
#
|
|
# old_location need not exist, but if it does, it must be a directory (or a
|
|
# symlink to a directory). If it is not, it is backed up. If new_location
|
|
# exists already and is not a directory, it is backed up.
|
|
#
|
|
# This function should be called from a package's preinst so that other
|
|
# packages unpacked after this one --- but before this package's postinst runs
|
|
# --- are unpacked into new_location even if their payloads contain
|
|
# old_location filespecs.
|
|
|
|
# Validate arguments.
|
|
if [ $# -ne 2 ]; then
|
|
usage_error "migrate_dir_to_symlink() called with wrong number of"
|
|
"arguments; expected 2, got $#"
|
|
exit $SHELL_LIB_USAGE_ERROR
|
|
fi
|
|
|
|
# We could just use the positional parameters as-is, but that makes things
|
|
# harder to follow.
|
|
local new old
|
|
|
|
old="$1"
|
|
new="$2"
|
|
|
|
# Is old location a symlink?
|
|
if [ -L "$old" ]; then
|
|
# Does it already point to new location?
|
|
if [ "$(readlink "$old")" = "$new" ]; then
|
|
# Nothing to do; migration has already been done.
|
|
observe "migration of $old to $new already done"
|
|
return 0
|
|
else
|
|
# Back it up.
|
|
warn "backing up symbolic link $old as $old.dpkg-old"
|
|
mv -b "$old" "$old.dpkg-old"
|
|
fi
|
|
fi
|
|
|
|
# Does old location exist, but is not a directory?
|
|
if [ -e "$old" ] && ! [ -d "$old" ]; then
|
|
# Back it up.
|
|
warn "backing up non-directory $old as $old.dpkg-old"
|
|
mv -b "$old" "$old.dpkg-old"
|
|
fi
|
|
|
|
observe "migrating $old to $new"
|
|
|
|
# Is new location a symlink?
|
|
if [ -L "$new" ]; then
|
|
# Does it point the wrong way, i.e., back to where we're migrating from?
|
|
if [ "$(readlink "$new")" = "$old" ]; then
|
|
# Get rid of it.
|
|
observe "removing symbolic link $new which points to $old"
|
|
rm "$new"
|
|
else
|
|
# Back it up.
|
|
warn "backing up symbolic link $new as $new.dpkg-old"
|
|
mv -b "$new" "$new.dpkg-old"
|
|
fi
|
|
fi
|
|
|
|
# Does new location exist, but is not a directory?
|
|
if [ -e "$new" ] && ! [ -d "$new" ]; then
|
|
warn "backing up non-directory $new as $new.dpkg-old"
|
|
mv -b "$new" "$new.dpkg-old"
|
|
fi
|
|
|
|
# Create new directory if it does not yet exist.
|
|
if ! [ -e "$new" ]; then
|
|
observe "creating $new"
|
|
mkdir -p "$new"
|
|
fi
|
|
|
|
# Copy files in old location to new location. Back up any filenames that
|
|
# already exist in the new location with the extension ".dpkg-old".
|
|
observe "copying files from $old to $new"
|
|
if ! (cd "$old" && cp -a -b -S ".dpkg-old" . "$new"); then
|
|
die "error(s) encountered while copying files from $old to $new"
|
|
fi
|
|
|
|
# Remove files at old location.
|
|
observe "removing $old"
|
|
rm -r "$old"
|
|
|
|
# Create symlink from old location to new location.
|
|
make_symlink_sane "$old" "$new"
|
|
}
|
|
|
|
# vim:set ai et sw=2 ts=2 tw=80:
|
|
|
|
# GOBSTOPPER: The X Strike Force shell library ends here.
|