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|
#!/bin/bash
# copy resumably with dd via network
script_name=$(basename "$0")
usage() {
>&2 printf 'usage:\n'
>&2 printf ' %s in-host in-dev out-dev log-file\n' "${script_name}"
>&2 printf ' %s -s in-dev start-position remote-port\n' "${script_name}"
exit 1
}
dd_options='bs=1M'
for needed in dd nc ss screen pgrep kill ssh; do
if ! which "${needed}" >/dev/null; then
>&2 printf 'please install required program %s\n' "${needed}"
exit 1
fi
done
if [ "x$1" = 'x-s' ]; then
shift
if [ $# -ne 3 ]; then
>&2 printf 'expected 3 arguments, got %s:\n' "$#"
>&2 printf '"%s" ' "$@"
>&2 printf '\n'
usage
fi
dev="$1"
start="$2"
remote_ip="${SSH_CLIENT%% *}"
if [ -z "${remote_ip}" ]; then
>&2 printf 'cannot obtain remote ip\n'
exit 1
fi
remote_port="$3"
if [ ! -r "${dev}" ]; then
>&2 printf 'cannot read from %s\n\n' "${dev}"
usage
fi
set +o pipefail
dd if="${dev}" ${dd_options} skip="${start}" 2>/dev/null | \
nc -cn "${remote_ip}" "${remote_port}"
exit $?
fi
if [ $# -ne 4 ]; then
usage
fi
remote_host="$1"
remote_dev="$2"
local_dev="$3"
log_file="$4"
if [ ! -w "${log_file%/*}" ] && [ ! -w "${log_file}" ]; then
>&2 printf 'cannot write/create log-file %s\n\n' "${log_file}"
usage
fi
if [ ! -w "${local_dev}" ]; then
>&2 printf 'cannot write to out-dev %s\n\n' "${local_dev}"
usage
fi
start=0
if [ -f "${log_file}" ]; then
start=$(
sed -n '
1 {
s/^start: //
p
q
}
' "${log_file}"
)
copied=$(
sed '
s/^\([0-9]\+\)+0 records out$/\1/
t
d
' "${log_file}" | \
sort -n | \
tail -n1
)
if [ -n "${copied}" ]; then
start=$((start+copied))
fi
fi
if pgrep -ax dd || pgrep -ax nc; then
>&2 printf 'another dd or nc is already running - this won'"'"'t work\n'
exit 1
fi
printf 'start: %s\n' "${start}" > \
"${log_file}"
screen -d -m bash -c '
set +o pipefail
nc -l -c | \
dd of="'"${local_dev}"'" '"${dd_options}"' seek='"${start}"' 2>>"'"${log_file}"'" >/dev/null
printf '"'"'\nwrite-pipe-exit: %s\n'"'"' $? >>"'"${log_file}"'"
'
for i in {1..20}; do
if [ -n "${port}" ]; then
break
elif [ ${i} -gt 1 ]; then
sleep 0.1
fi
nc_pid=$(
pgrep -x nc
)
dd_pid=$(
pgrep -x dd
)
port=$(
ss -nlp | \
grep -F ",pid=${nc_pid}," | \
awk '{print $5}' | \
sed 's/^.*://'
)
done
if [ -z "${port}" ]; then
>&2 printf 'could not determine listening port\n'
exit 1
fi
screen -d -m bash -c '
while kill -SIGUSR1 '"${dd_pid}"'; do
sleep 1
done
'
ssh "${remote_host}" "${script_name} -s ${remote_dev} ${start} ${port}"
printf '\nssh-exit: %s\n' $? >>"${log_file}"
|
