/usr/lib/dracut/modules.d/90livenet/fetch-liveupdate.sh is in dracut-network 040+1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | #!/bin/bash
# fetch-liveupdate - fetch an update image for dmsquash-live media.
# this gets called by the "initqueue/online" hook for each network interface
# that comes online.
# no updates requested? we're not needed.
[ -e /tmp/liveupdates.info ] || return 0
command -v getarg >/dev/null || . /lib/dracut-lib.sh
command -v fetch_url >/dev/null || . /lib/url-lib.sh
command -v unpack_img >/dev/null || . /lib/img-lib.sh
read url < /tmp/liveupdates.info
info "fetching live updates from $url"
fetch_url "$url" /tmp/updates.img
if [ $? != 0 ]; then
warn "failed to fetch update image!"
warn "url: $url"
return 1
fi
unpack_img /tmp/updates.img /updates.tmp.$$
if [ $? != 0 ]; then
warn "failed to unpack update image!"
warn "url: $url"
return 1
fi
copytree /updates.tmp.$$ /updates
mv /tmp/liveupdates.info /tmp/liveupdates.done
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