author | Dan Fuhry <dan@enanocms.org> |
Mon, 05 Jul 2010 23:57:56 -0400 | |
changeset 5 | 7d3b7009399d |
parent 4 | c6c431cf0a89 |
permissions | -rw-r--r-- |
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#!/bin/bash |
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if test -z "$BASH"; then |
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cmd="$0" |
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if test "`basename $0`" = "$0"; then |
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cmd="./$0" |
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fi |
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echo "This script is designed to be run using GNU bash." |
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echo "Try: chmod +x $0 && $cmd" |
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exit 1 |
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fi |
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# OS X sed (at least leopard and up) seem to support -E |
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sedflags=Ee |
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if ( sed --version 2>&1 | grep 'GNU sed' 2>&1 ) > /dev/null ; then |
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sedflags=re |
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fi |
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my_which_real() |
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{ |
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test -n "$1" || return 1 |
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local i |
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local part |
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for (( i=1; ; i++ )); do |
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part=`echo "$PATH" | cut -d ':' -f $i` |
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test -n "$part" || return 1 |
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if test -x "$part/$1"; then |
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echo "$part/$1" |
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return 0 |
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fi |
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done |
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} |
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my_which() |
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{ |
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local out |
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local r |
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out=`my_which_real "$1"` |
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r=$? |
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if [ -z "$out" -o $r = 1 ]; then |
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echo "ERROR: $1 command not found on system" 1>&2 |
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exit 1 |
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fi |
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echo $out |
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return $r |
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} |
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# Show the extraction progress spinner. |
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# Spins the propeller one time for each line on stdin |
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progressbit() |
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{ |
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local i |
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local pbar |
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local line |
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i=0 |
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pbar="-\\|/" |
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while read line; do |
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((i++)) |
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j=$(($i % ${#pbar})) |
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echo -ne "\r${pbar:$j:1} Extracting..." |
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done |
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} |
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# Create a temp directory. Very bad in terms of randomness source, but hey, I'm a security major. Can't help it. |
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mktempdir() |
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local tempdir |
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tempdir=/tmp/ext`$dd if=/dev/urandom bs=128 count=1 2>/dev/null | $md5sum - | cut -c 1-6` |
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echo $tempdir |
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return 0 |
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} |
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# Outputs the raw compressed tarball data on stdout. |
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getdata() |
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{ |
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offset=`$cat $0 | $grep -an '^##DATA' | cut -d ':' -f 1 || exit 1` |
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offset=$((offset + 1)) |
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$cat $0 | $tail -n+$offset |
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} |
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# Go through each required command, and make sure it's on the system. If not, fail. |
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for cmd in bzip2 tar grep tail cat wc dd; do |
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my_which $cmd>/dev/null || exit 1 |
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eval $cmd=`my_which $cmd` |
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if test x$? = x1; then |
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exit 1 |
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fi |
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done |
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# special case for md5sum |
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if my_which_real md5sum 2>&1 > /dev/null; then |
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md5sum=`my_which_real md5sum` |
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elif my_which_real openssl 2>&1 > /dev/null; then |
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md5sum=md5sum |
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md5sum() |
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{ |
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local f=${1:--} |
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cat $f | openssl dgst -md5 | sed -$sedflags 's/^\(stdin\)= //' |
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} |
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else |
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echo "Could not find md5sum or openssl" |
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exit 1 |
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fi |
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tempdir="" |
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extractonly=0 |
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while test -n "$1"; do |
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case "$1" in |
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-x) |
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extractonly=1 |
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if test -n "$2"; then |
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tempdir=$2 |
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else |
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tempdir=`echo $0 | sed -$sedflags 's/\.[a-z0-9_-]{1,5}$//'` |
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fi |
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;; |
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esac |
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shift |
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done |
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# Make sure we have a working temp directory |
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test -n "$tempdir" || tempdir=`mktempdir` |
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if [ -d "$tempdir" ]; then |
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if [ $extractonly = 1 ]; then |
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i=0 |
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basetemp="$tempdir" |
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while test -d "$tempdir"; do |
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tempdir="${basetemp}${i}" |
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((i++)) |
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done |
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else |
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while test -d "$tempdir"; do |
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tempdir=`mktempdir` |
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done |
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fi |
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fi |
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mkdir "$tempdir" || exit 1 |
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# Finally, extract the data. |
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echo -ne "\e[?25l- Extracting..." |
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getdata | $bzip2 -dc | $tar xvCf $tempdir - | progressbit \ |
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|| ( |
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rm -rf $tempdir |
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echo -ne "\e[?25h" |
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exit 1 |
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) |
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# clear out the extraction progress |
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echo -ne "\r\e[?25h" |
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# trap exits so we can clean up if the script is interrupted |
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handle_interrupt() |
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{ |
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rm -rf $tempdir |
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# added in rev. 2, interrupts should cause an error exit |
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exit 1 |
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} |
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trap handle_interrupt 0 |
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if test -x $tempdir/autorun.sh && test $extractonly != 1; then |
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# Run the autorun script |
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$tempdir/autorun.sh |
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ret=$? |
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rm -rf $tempdir |
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exit $ret |
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else |
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# Just let the user know where the files are and die. |
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echo "Contents extracted to $tempdir." |
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fi |
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# free our trap on signals |
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trap "exit 0;" 0 |
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# done! |
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exit 0 |
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# don't touch this marker! Everything after this is expected to be binary data. |
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0 | 181 |
##DATA |