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#!/bin/bash
# This is a shell script for keeping the support code
# for the 15-410 kernel up to date.
#
# Ivan Jager (aij)
#
###########################################################
# Usage:
# update.sh <how> [query]
#
# <how>:
# afs - update files by comparing md5sums
# taken from course afs space. If
# files don't match digests, grab
# updated files from course afs space.
#
# web - same but from course webspace.
#
# offline - build support libraries using
# code present in local directories.
# This method is *not* recommended for
# typical use.
#
###########################################################
# location of official support code and libraries
AFS_PATH=${AFS_PATH-/afs/cs.cmu.edu/academic/class/15410-s23/Web/update/proj4}
WEB_URL=${WEB_URL-'http://www.cs.cmu.edu/~410-s23/update/proj4'}
# the name of the file containing the MD5s for the files we want to update
WHAT=all.md5s
#fetches a file from the update area, either to a specific destination, or
# to the same relative filename if no destination is specified
function fetch () {
local mode=$1
local from=$2
local to=${3:-$2}
# make the directory to put the file in if it doesn't exist
test -d `dirname "$to"` || mkdir -p `dirname "$to"`
case "$METHOD" in
afs)
cp "$AFS_PATH/$from" "$to.tmp" && mv "$to.tmp" "$to" ;;
web)
wget -nv "$WEB_URL/$from" -O "$to.tmp" && mv "$to.tmp" "$to" ;;
query)
test -f "$to" && echo "$from hasn't been updated since `stat -c %y $to`" || echo "File $to is missing"
NEEDS_UPDATING=true
return ;;
*) echo fetch: method invalid: $METHOD; exit 2 ;;
esac &&
chmod $mode "$to"
}
# reads a list of md5s to check and update from stdin
function do_update () {
rc=0
while read mode md5 filename
#for filename in `md5sum -c | tee >(cat >&3) | grep -v OK$ | sed 's/: FAILED.*//g'`
do
current=`md5sum "$filename" | cut -d ' ' -f 1`
if [ "$current" != "$md5" ]
then
echo Update "$filename"
fetch $mode "$filename" || rc=$?
fi
done 3>&1
test -z "$NEEDS_UPDATING" || { /bin/echo -e '****\nUpdates are available. Please run make update sometime soon.\n****\7'; sleep 1; /bin/echo -e '\7'; sleep 1; /bin/echo -e '\7'; }
return $rc
}
# find out what method we were told to use
# One of afs, web, or offline. (rsync coming "soon")
case $1 in
'')
{ test -d $AFS_PATH && METHOD=afs ; } || \
{ which wget >/dev/null 2>&1 && METHOD=web ; } || \
METHOD=offline
;;
afs|web|offline)
METHOD=$1
;;
*)
echo usage: $0 'afs|web|offline' '[query]'
exit 9
;;
esac
if [ "$METHOD" = offline ] ; then
echo UPDATE METHOD IS OFFLINE. This is not recommended.
echo Be sure to update and make sure your code works before handing it in.
sleep 3
exit
fi
# this could be changed to not make a copy when updating from AFS
fetch 644 $WHAT .md5s || { echo Failed to fetch the list of MD5s.; exit 1; }
echo "# Fetched by $0 $@ at `date`" >>.md5s
test "$2" = query && METHOD=query
grep -v '^#' .md5s | do_update
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