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#!/bin/sh
# livenetroot - fetch a live image from the network and run it
type getarg > /dev/null 2>&1 || . /lib/dracut-lib.sh
. /lib/url-lib.sh
PATH=/usr/sbin:/usr/bin:/sbin:/bin
RETRIES=${RETRIES:-100}
SLEEP=${SLEEP:-5}
[ -e /tmp/livenet.downloaded ] && exit 0
# args get passed from 40network/netroot
netroot="$2"
liveurl="${netroot#livenet:}"
info "fetching $liveurl"
if getargbool 0 'rd.writable.fsimg'; then
imgheader=$(curl -sIL "$liveurl")
# shellcheck disable=SC2181
ret=$?
if [ $ret != 0 ]; then
warn "failed to get live image header: error $ret"
else
imgheaderlen=$(echo "$imgheader" | sed -n 's/[cC]ontent-[lL]ength: *\([[:digit:]]*\).*/\1/p')
if [ -z "$imgheaderlen" ]; then
warn "failed to get 'Content-Length' header from live image"
else
imgsize=$((imgheaderlen / (1024 * 1024)))
check_live_ram $imgsize
fi
fi
fi
imgfile=
#retry until the imgfile is populated with data or the max retries
i=1
while [ "$i" -le "$RETRIES" ]; do
imgfile=$(fetch_url "$liveurl")
# shellcheck disable=SC2181
ret=$?
if [ $ret != 0 ]; then
warn "failed to download live image: error $ret"
imgfile=
fi
if [ -n "$imgfile" ] && [ -s "$imgfile" ]; then
break
else
if [ $i -ge "$RETRIES" ]; then
warn "failed to download live image after $i attempts."
exit 1
fi
sleep "$SLEEP"
fi
i=$((i + 1))
done > /tmp/livenet.downloaded
# TODO: couldn't dmsquash-live-root handle this?
if [ "${imgfile##*.}" = "iso" ]; then
root=$(losetup -f)
losetup "$root" "$imgfile"
else
root=$imgfile
fi
exec /sbin/dmsquash-live-root "$root"
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