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#!/bin/sh
# $XTermId: sinstall.sh,v 1.16 2008/03/02 23:35:02 tom Exp $
#
# Install program setuid if the installer is running as root, and if xterm is
# already installed on the system with setuid privilege. This is a safeguard
# for ordinary users installing xterm for themselves on systems where the
# setuid is not needed to access a PTY, but only for things like utmp.
#
# Options:
# u+s, g+s as in chmod
# -u, -g and -m as in install. If any options are given, $3 is ignored.
#
# Parameters:
# $1 = program to invoke as "install"
# $2 = program to install
# $3 = previously-installed program, for reference
# $4 = final installed-path, if different from reference
trace=:
trace=echo
# override locale...
# (otherwise GNU ls displays date column in a locale-dependent manner).
LANG=C; export LANG
LANGUAGE=C; export LANGUAGE
LC_ALL=C; export LC_ALL
LC_CTYPE=C; export LC_CTYPE
OPTS_SUID=
OPTS_SGID=
OPTS_MODE=
OPTS_USR=
OPTS_GRP=
while test $# != 0
do
case $1 in
-*)
OPT="$1"
shift
if test $# != 0
then
case $OPT in
-u) OPTS_USR="$1"; shift;;
-g) OPTS_GRP="$1"; shift;;
-m) OPTS_MODE="$1"; shift;;
esac
else
break
fi
;;
u+s) shift; OPTS_SUID=4000;;
g+s) shift; OPTS_SGID=2000;;
*) break
;;
esac
done
SINSTALL="$1"
SRC_PROG="$2"
REF_PROG="$3"
DST_PROG="$4"
test -z "$SINSTALL" && SINSTALL=install
test -z "$SRC_PROG" && SRC_PROG=xterm
test -z "$REF_PROG" && REF_PROG=/usr/bin/X11/xterm
test -z "$DST_PROG" && DST_PROG="$REF_PROG"
test -n "$OPTS_SUID" && test -n "$OPTS_USR" && REF_PROG=
test -n "$OPTS_SGID" && test -n "$OPTS_GRP" && REF_PROG=
echo checking for presumed installation-mode
PROG_SUID=
PROG_SGID=
PROG_MODE=
PROG_USR=
PROG_GRP=
if test -z "$REF_PROG" ; then
$trace "... reference program not used"
elif test -f "$REF_PROG" ; then
cf_option="-l -L"
MYTEMP=${TMPDIR-/tmp}/sinstall$$
# Expect listing to have fields like this:
#-r--r--r-- 1 user group 34293 Jul 18 16:29 pathname
ls $cf_option $REF_PROG
ls $cf_option $REF_PROG >$MYTEMP
read cf_mode cf_links cf_usr cf_grp cf_size cf_date1 cf_date2 cf_date3 cf_rest <$MYTEMP
$trace "... if \"$cf_rest\" is null, try the ls -g option"
if test -z "$cf_rest" ; then
cf_option="$cf_option -g"
ls $cf_option $REF_PROG
ls $cf_option $REF_PROG >$MYTEMP
read cf_mode cf_links cf_usr cf_grp cf_size cf_date1 cf_date2 cf_date3 cf_rest <$MYTEMP
fi
rm -f $MYTEMP
# If we have a pathname, and the date fields look right, assume we've
# captured the group as well.
$trace "... if \"$cf_rest\" is null, we do not look for group"
if test -n "$cf_rest" ; then
cf_test=`echo "${cf_date2}${cf_date3}" | sed -e 's/[0-9:]//g'`
$trace "... if we have date in proper columns ($cf_date1 $cf_date2 $cf_date3), \"$cf_test\" is null"
if test -z "$cf_test" ; then
PROG_USR=$cf_usr;
PROG_GRP=$cf_grp;
fi
fi
$trace "... derived user \"$PROG_USR\", group \"$PROG_GRP\" of previously-installed $SRC_PROG"
$trace "... see if mode \"$cf_mode\" has s-bit set"
case ".$cf_mode" in #(vi
.???s??s*) #(vi
$trace "... both setuid/setgid"
PROG_SUID=4000
PROG_SGID=2000
;;
.???s*) #(vi
$trace "... setuid"
PROG_SUID=4000
PROG_GRP=
;;
.??????s*)
$trace "... setgid"
PROG_SGID=2000
PROG_USR=
;;
esac
PROG_MODE=`echo ".$cf_mode" | sed -e 's/^..//' -e 's/rw./7/g' -e 's/r-./5/g' -e 's/---/0/g' -e 's/--[sxt]/1/g' -e 's/+//g'`
fi
# passed-in options override the reference
test -n "$OPTS_SUID" && PROG_SUID="$OPTS_SUID"
test -n "$OPTS_SGID" && PROG_SGID="$OPTS_SGID"
test -n "$OPTS_MODE" && PROG_MODE="$OPTS_MODE"
test -n "$OPTS_USR" && PROG_USR="$OPTS_USR"
test -n "$OPTS_GRP" && PROG_GRP="$OPTS_GRP"
# we always need a mode
test -z "$PROG_MODE" && PROG_MODE=755
if test -n "${PROG_USR}${PROG_GRP}" ; then
cf_uid=`id | sed -e 's/^[^=]*=//' -e 's/(.*$//'`
cf_usr=`id | sed -e 's/^[^(]*(//' -e 's/).*$//'`
cf_grp=`id | sed -e 's/^.* gid=[^(]*(//' -e 's/).*$//'`
$trace "... installing $SRC_PROG as user \"$cf_usr\", group \"$cf_grp\""
if test "$cf_uid" != 0 ; then
PROG_SUID=
PROG_SGID=
PROG_USR=""
PROG_GRP=""
fi
test "$PROG_USR" = "$cf_usr" && PROG_USR=""
test "$PROG_GRP" = "$cf_grp" && PROG_GRP=""
fi
test -n "${PROG_SUID}${PROG_SGID}" && PROG_MODE=`expr $PROG_MODE % 1000`
test -n "$PROG_SUID" && PROG_MODE=`expr $PROG_SUID + $PROG_MODE`
test -n "$PROG_SGID" && PROG_MODE=`expr $PROG_SGID + $PROG_MODE`
test -n "$PROG_USR" && PROG_USR="-o $PROG_USR"
test -n "$PROG_GRP" && PROG_GRP="-g $PROG_GRP"
echo "$SINSTALL -m $PROG_MODE $PROG_USR $PROG_GRP $SRC_PROG $DST_PROG"
eval "$SINSTALL -m $PROG_MODE $PROG_USR $PROG_GRP $SRC_PROG $DST_PROG"
|
