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#!/bin/bash
########################################################
# Include: Detect, whether runvirt runs in legacy mode #
########################################################
## Functions ##
# Legacy mode: As runvirt has been before.
# New mode: uuid in xml _and_ vmx given via http.
download_metadata() {
local TRIES EXTRA_ERROR WLOG TMPFILE RET ERRCODE
# Sanity checks
if ! check_dep wget; then
writelog "Could not find 'wget' in PATH: $PATH"
EXIT_TYPE="internal" EXIT_REASON="Fehlendes Dienstprogramm 'wget'!" cleanexit 1
fi
if isempty SLX_VMCHOOSER_BASE_URL; then
writelog "SLX_VMCHOOSER_BASE_URL is not set! Was /opt/openslx/config sourced?"
EXIT_TYPE="internal" EXIT_REASON="msg.vmchooser.url-missing Keine URL zur Schnittstelle des bwLehrpool-Satelliten gefunden!" cleanexit 1
fi
writelog "Detecting current/legacy mode..."
# Try new unified .tar.gz way
TMPFILE="$TMPDIR/metadata.tgz"
WLOG="$TMPDIR/wget-metadata.log"
curl -L -o "$TMPFILE" -w '\nretval:%{http_code}\n' --retry 3 --max-time 6 --retry-max-time 15 "${SLX_VMCHOOSER_BASE_URL}/lecture/${IMGUUID}/metadata" &> "$WLOG"
ERRCODE=$( awk -F: '{ if ($1 == "retval") print $2 }' "$WLOG" )
RET=$?
if [ "$RET" = 0 ] && [ -n "$ERRCODE" ] && [ "$ERRCODE" -ge 200 ] && [ "$ERRCODE" -lt 300 ]; then
# Success, see if data is usable
mkdir -p "$TMPDIR/metadata"
if tar -C "$TMPDIR/metadata" -x -f "$TMPFILE" && [ -s "$TMPDIR/metadata/vmx" ]; then
declare -rg TMPCONFIG="$TMPDIR/metadata/vmx"
declare -rg CONFDIR="$TMPDIR/metadata"
return 0
fi
rm -rf -- "$TMPDIR/metadata" "$TMPFILE"
writelog "Extracting metadata.tgz failed. Trying legacy mode."
elif [ -n "$ERRCODE" ] && [ "$ERRCODE" -ge 500 ]; then
slxlog --delete "run-virt-wget" "Downloading MetaData failed" "$WLOG"
fi
writelog "Metadata download failed, trying legacy approach..."
declare -rg TMPCONFIG="$TMPDIR/vmconfig.tmp"
TRIES=0
while [ "$TRIES" -lt 3 ]; do
TRIES=$(( TRIES + 1 ))
writelog "wget try $TRIES"
WLOG="$TMPDIR/wget-${TRIES}.log"
if wget -T 6 -O "$TMPCONFIG" "${SLX_VMCHOOSER_BASE_URL}/lecture/${IMGUUID}" &>"$WLOG"; then
rm -f -- "$WLOG"
writelog "Downloaded VM description from '${SLX_VMCHOOSER_BASE_URL}/lecture/${IMGUUID}' successfully."
if [ -s "$TMPCONFIG" ]; then
# Downloaded a non-zero VM description file, all good
return 0
else
writelog "Server sent zero byte virtual machine description file."
EXTRA_ERROR="(Der Server hat eine leere Antwort gesendet)"
fi
else
local ERRCODE=$(grep -m1 -o -E '\b[0-9]{3}\b' "$WLOG")
if [ -n "$ERRCODE" ]; then
EXTRA_ERROR="(HTTP Error Code $ERRCODE)"
else
EXTRA_ERROR="(Der Server ist nicht erreichbar)"
fi
writelog "wget failed."
slxlog --delete "run-virt-wget" "Downloading VMX failed" "$WLOG"
fi
done
# Seems we are in legacy mode, which is no longer supported. Warn user and exit
EXIT_TYPE="user" EXIT_REASON="msg.vm.no-metadata
Die Metadaten der Lehrumgebung konnten nicht vom bwLehrpool-Satelliten
heruntergeladen werden. Bitte versuchen Sie es in wenigen Minuten erneut
und wenden Sie sich an den Support, wenn das Problem bestehen bleibt.
$EXTRA_ERROR
" cleanexit 1
}
## Main ##
call_post_source download_metadata
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