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115 lines
3.2 KiB
Bash
115 lines
3.2 KiB
Bash
#!/bin/bash
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# Part of the xs-activity-server package
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#
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# based on a similarly named script in the xs-rsync package
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# by Martin Langhoff <martin@laptop.org>
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#
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# Adapted for xs-activity-server by Douglas Bagnall
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# <douglas@paradise.net.nz>
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#
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# Copyright: One Laptop per Child
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set -e
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VERBOSE=yes
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MAGIC_DIR=$UM_MOUNTPOINT/xs-activity-server
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FINAL_DIR=/library/xs-activity-server/activities
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FILES_TO_RM=""
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# combined with set -e, error() is called if something fails.
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error(){
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logger -puser.err -t "xs-activity-server[$$]" "Error at line $(caller)"
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[ "$FILES_TO_RM" ] && rm -rf $FILES_TO_RM
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}
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trap error ERR
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# Log a string via the syslog facility.
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log()
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{
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if test $1 != debug || expr "$VERBOSE" : "[yY]" > /dev/null; then
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logger -p user.$1 -t "xs-activity-server[$$]" -- "$2"
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fi
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}
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STEPS=7
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[ -d $MAGIC_DIR ] || exit 0
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log notice 'Found activity install directory';
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log notice "[1/$STEPS] Checking whether it has a manifest";
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if [ -r $MAGIC_DIR/manifest.sha1 ];then
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log notice "[2/$STEPS] Seems to have a manifest";
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else
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log err "[2/$STEPS] Missing manifest"
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exit 1;
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fi
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## Do we have enough space?
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# note: we could use awk {'print $4'} instead of the
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# perl regex, but it breaks with long /dev nodes
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# such as those from LVMs -which wrap. The regex captures the
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# number just left of the number with the percentage sign.
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NEED=`du -s -B1M $MAGIC_DIR | awk {'print $1'}`
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HAVE=`df -B1M $FINAL_DIR | tail -n1 | \
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perl -pe 'm/(\d+)\s+\d+\%/; $_=($1-1);'`
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if [ $NEED -gt $HAVE ];then
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log err 'Not enough free space in /library for these activities - cancelling';
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exit 1;
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fi
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### Copy it first - as the media is bound to be slow
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# - make this atomic by cp'ing to a tmpdir, and mv'ing into place
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# to be fail-safe
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# - mv aside manifest.sha1 and its sig
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# - TODO? we could avoid cp'ing files we already have using
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# rsync --copy-dest instead of cp
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#
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log notice "[3/$STEPS] Copying activities to disk";
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TMPDEST=`mktemp -d -p /library/xs-activity-server/tmp`
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#make sure the tmp directory goes
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FILES_TO_RM="$FILES_TO_RM '$TMPDEST'"
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cp --preserve=timestamps $MAGIC_DIR/* $TMPDEST
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# In a tmpdir we own, safe from race conditions
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# run the checksums...
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log notice "[4/$STEPS] Checking the manifest";
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# mv the manifest to a different dir
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TMPMANIF=`mktemp -d -p /library/xs-activity-server/tmp`
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FILES_TO_RM="$FILES_TO_RM '$TMPMANIF'"
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mv $TMPDEST/manifest.sha1 $TMPMANIF/
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if [ -e $TMPDEST/manifest.sha1.sig ]; then
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mv $TMPDEST/manifest.sha1.sig $TMPMANIF/
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fi
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xs-sum -c $TMPMANIF/manifest.sha1 -d $TMPDEST
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#Let syslog know what we're doing
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cd $TMPDEST
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log notice "found $(ls *.xo |wc -l) activities"
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log debug "found these activities: $(ls *.xo)"
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cd -
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log notice "[5/$STEPS] Copy the directories into place";
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#XXX not checking whether this clobbers existing files.
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mv $TMPDEST/* $FINAL_DIR
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#So, now all the activities are in place, but maybe they're not
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#newer than what we have. So xs-regenerate-activities has to work that out.
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log notice "[6/$STEPS] Regenerating the list of available activities";
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/usr/bin/xs-regenerate-activities $FINAL_DIR 2>&1 | logger -p user.debug -t "xs-activity-server[$$]"
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log notice "[$STEPS/$STEPS] Finished - XOs can now update activities.";
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rm -fr $FILES_TO_RM
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