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|
#! /bin/bash
# @file update_install
# @author Nat Goodspeed
# @date 2013-01-09
# @brief Update the containing Second Life application bundle to the version in
# the specified tarball.
#
# This bash implementation is derived from the previous linux-updater.bin
# application.
#
# $LicenseInfo:firstyear=2013&license=viewerlgpl$
# Copyright (c) 2013, Linden Research, Inc.
# $/LicenseInfo$
tarball="$1" # the file to install
markerfile="$2" # create this file on failure
mandatory="$3" # what to write to markerfile on failure
function log {
# our log file will be open as stderr -- but until we set up that
# redirection, logging to stderr is better than nothing
echo "$*" 1>&2
}
function status {
log "$@"
# Prefix with '#' so xmenity will recognize it as a status message
echo "#$*"
}
function fail {
# Log the message
log "$@"
# tell subsequent viewer things went south
echo "$mandatory" > "$markerfile"
# add boilerplate
local msg="An error occurred while updating Second Life:
$*
Please download the latest viewer from www.secondlife.com."
# Restate test from xmenity to detect whether we can use zenity or must
# fall back to xmessage
zenpath="$(which zenity)"
if [ -n "$zenpath" -a -x "$zenpath" ]
then "$zenpath" --error --title "Second Life Viewer Updater" \
--width=320 --height=120 --text="$msg"
else xmessage -buttons -OK:2 -center "$msg"
fi
exit 1
}
function sudo_mv {
# If we have write permission to both parent directories, shouldn't need
# sudo.
if [ -w "$(dirname "$1")" -a -w "$(dirname "$2")" ]
then mv "$1" "$2"
else # use one of the likely sudo programs
sudo="$(which gksudo)"
if [ -z "$sudo" ]
then sudo="$(which kdesu)"
fi
if [ -z "$sudo" ]
then # couldn't find either one, just try it anyway
mv "$1" "$2"
else # even with sudo, could fail, e.g. different filesystems
"$sudo" mv "$1" "$2"
fi
fi
}
# empty array
cleanups=()
function cleanup {
# wacky bash syntax for appending to array
cleanups[${#cleanups[*]}]="$*"
}
function onexit {
for action in "${cleanups[@]}"
do # don't quote, support actions consisting of multiple words
$action
done
}
trap 'onexit' EXIT
mydir="$(dirname "$0")"
# We happen to know that the viewer specifies a marker-file pathname within
# the logs directory.
logsdir="$(dirname "$markerfile")"
logname="$logsdir/updater.log"
# move aside old updater.log; we're about to create a new one
[ -f "$logname" ] && mv "$logname" "$logname.old"
# Set up redirections for this script such that stderr is logged. (But first
# move the previous stderr to file descriptor 3.)
exec 3>&2- 2> "$logname"
# Piping to xmenity requires that we end with a line consisting of the string
# "100" to terminate zenity progress bar.
cleanup echo 100
# Rather than setting up a special pipeline to timestamp every line of stderr,
# produce header lines into log file indicating timestamp and the arguments
# with which we were invoked.
date 1>&2
log "$0 $*"
# Log every command we execute, along with any stderr it might produce
set -x
status 'Installing Second Life...'
# Creating tempdir under /tmp means it's possible that tempdir is on a
# different filesystem than INSTALL_DIR. One is tempted to create tempdir on a
# path derived from `dirname INSTALL_DIR`, but then we might need to add
# another sudo prompt to create it.
tempdir="/tmp/$(basename "$0").$$"
tempinstall="$tempdir/install"
mkdir -p "$tempinstall" || fail "Couldn't create $tempinstall"
cleanup rm -rf "$tempdir"
# If we already knew the name of the tarball's top-level directory, we could
# just move that when all was said and done. Since we don't, untarring to the
# 'install' subdir with --strip 1 effectively renames that top-level
# directory.
tar --strip 1 -xjf "$tarball" -C "$tempinstall" || fail "Untar command failed"
INSTALL_DIR="$(cd "$mydir/.." ; pwd)"
# Considering we're launched from a subdirectory of INSTALL_DIR, would be
# surprising if it did NOT already exist...
if [ -e "$INSTALL_DIR" ]
then backup="$INSTALL_DIR.backup"
backupn=1
while [ -e "$backup" ]
do backup="$INSTALL_DIR.backup.$backupn"
((backupn += 1))
done
sudo_mv "$INSTALL_DIR" "$backup" || fail "Couldn't move $INSTALL_DIR to $backup"
fi
# We unpacked the tarball into tempinstall. Move that.
if ! sudo_mv "$tempinstall" "$INSTALL_DIR"
then # If we failed to move the temp install to INSTALL_DIR, try to restore
# INSTALL_DIR from backup
sudo_mv "$backup" "$INSTALL_DIR"
fail "Couldn't move $1 to $2"
fi
rm -f "$tarball"
# Launch the updated viewer. Restore original stderr from file descriptor 3,
# though -- otherwise updater.log gets cluttered with the viewer log!
"$INSTALL_DIR/secondlife" 2>&3- &
|
