modules.d/90livenet/livenetroot.sh

   1 #!/bin/sh
   2 # livenetroot - fetch a live image from the network and run it
   3
   4 type getarg > /dev/null 2>&1 || . /lib/dracut-lib.sh
   5
   6 . /lib/url-lib.sh
   7
   8 PATH=/usr/sbin:/usr/bin:/sbin:/bin
   9 RETRIES=${RETRIES:-100}
  10 SLEEP=${SLEEP:-5}
  11
  12 [ -e /tmp/livenet.downloaded ] && exit 0
  13
  14 # args get passed from 40network/netroot
  15 netroot="$2"
  16 liveurl="${netroot#livenet:}"
  17 info "fetching $liveurl"
  18
  19 if getargbool 0 'rd.writable.fsimg'; then
  20
  21     imgsize=$(($(curl -sIL "$liveurl" | sed -n 's/Content-Length: *\([[:digit:]]*\).*/\1/p') / (1024 * 1024)))
  22
  23     check_live_ram $imgsize
  24 fi
  25
  26 imgfile=
  27 #retry until the imgfile is populated with data or the max retries
  28 i=1
  29 while [ "$i" -le "$RETRIES" ]; do
  30     imgfile=$(fetch_url "$liveurl")
  31
  32     # shellcheck disable=SC2181
  33     if [ $? != 0 ]; then
  34         warn "failed to download live image: error $?"
  35         imgfile=
  36     fi
  37
  38     if [ -n "$imgfile" -a -s "$imgfile" ]; then
  39         break
  40     else
  41         if [ $i -ge "$RETRIES" ]; then
  42             warn "failed to download live image after $i attempts."
  43             exit 1
  44         fi
  45
  46         sleep "$SLEEP"
  47     fi
  48
  49     i=$((i + 1))
  50 done > /tmp/livenet.downloaded
  51
  52 # TODO: couldn't dmsquash-live-root handle this?
  53 if [ "${imgfile##*.}" = "iso" ]; then
  54     root=$(losetup -f)
  55     losetup "$root" "$imgfile"
  56 else
  57     root=$imgfile
  58 fi
  59
  60 exec /sbin/dmsquash-live-root "$root"