From 4bfadd7120a1c5485a9994822242a2a163dc0814 Mon Sep 17 00:00:00 2001 From: Matthieu Baerts Date: Wed, 9 Mar 2022 11:16:35 -0800 Subject: [PATCH] selftests: mptcp: join: avoid backquotes As explained on ShellCheck's wiki [1], it is recommended to avoid backquotes `...` in favour of parenthesis $(...): > Backtick command substitution `...` is legacy syntax with several > issues. > > - It has a series of undefined behaviors related to quoting in POSIX. > - It imposes a custom escaping mode with surprising results. > - It's exceptionally hard to nest. > > $(...) command substitution has none of these problems, and is > therefore strongly encouraged. [1] https://www.shellcheck.net/wiki/SC2006 Signed-off-by: Matthieu Baerts Signed-off-by: Mat Martineau Signed-off-by: Jakub Kicinski --- .../testing/selftests/net/mptcp/mptcp_join.sh | 66 ++++++++++--------- 1 file changed, 34 insertions(+), 32 deletions(-) diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh index d8dc36fcdb560..f5391d027af20 100755 --- a/tools/testing/selftests/net/mptcp/mptcp_join.sh +++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh @@ -83,7 +83,7 @@ init_partial() # ns1eth4 ns2eth4 local i - for i in `seq 1 4`; do + for i in $(seq 1 4); do ip link add ns1eth$i netns "$ns1" type veth peer name ns2eth$i netns "$ns2" ip -net "$ns1" addr add 10.0.$i.1/24 dev ns1eth$i ip -net "$ns1" addr add dead:beef:$i::1/64 dev ns1eth$i nodad @@ -102,7 +102,7 @@ init_partial() init_shapers() { local i - for i in `seq 1 4`; do + for i in $(seq 1 4); do tc -n $ns1 qdisc add dev ns1eth$i root netem rate 20mbit delay 1 tc -n $ns2 qdisc add dev ns2eth$i root netem rate 20mbit delay 1 done @@ -969,7 +969,7 @@ chk_csum_nr() fi printf "%-${nr_blank}s %s" " " "sum" - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtDataCsumErr | awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtDataCsumErr | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != $csum_ns1 -a $allow_multi_errors_ns1 -eq 0 ] || [ "$count" -lt $csum_ns1 -a $allow_multi_errors_ns1 -eq 1 ]; then @@ -980,7 +980,7 @@ chk_csum_nr() echo -n "[ ok ]" fi echo -n " - csum " - count=`ip netns exec $ns2 nstat -as | grep MPTcpExtDataCsumErr | awk '{print $2}'` + count=$(ip netns exec $ns2 nstat -as | grep MPTcpExtDataCsumErr | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != $csum_ns2 -a $allow_multi_errors_ns2 -eq 0 ] || [ "$count" -lt $csum_ns2 -a $allow_multi_errors_ns2 -eq 1 ]; then @@ -1001,7 +1001,7 @@ chk_fail_nr() local dump_stats printf "%-${nr_blank}s %s" " " "ftx" - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPFailTx | awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtMPFailTx | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$fail_tx" ]; then echo "[fail] got $count MP_FAIL[s] TX expected $fail_tx" @@ -1012,7 +1012,7 @@ chk_fail_nr() fi echo -n " - failrx" - count=`ip netns exec $ns2 nstat -as | grep MPTcpExtMPFailRx | awk '{print $2}'` + count=$(ip netns exec $ns2 nstat -as | grep MPTcpExtMPFailRx | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$fail_rx" ]; then echo "[fail] got $count MP_FAIL[s] RX expected $fail_rx" @@ -1121,7 +1121,7 @@ chk_join_nr() fi printf "%03u %-36s %s" "${TEST_COUNT}" "${title}" "syn" - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinSynRx | awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinSynRx | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$syn_nr" ]; then echo "[fail] got $count JOIN[s] syn expected $syn_nr" @@ -1132,8 +1132,8 @@ chk_join_nr() fi echo -n " - synack" - with_cookie=`ip netns exec $ns2 sysctl -n net.ipv4.tcp_syncookies` - count=`ip netns exec $ns2 nstat -as | grep MPTcpExtMPJoinSynAckRx | awk '{print $2}'` + with_cookie=$(ip netns exec $ns2 sysctl -n net.ipv4.tcp_syncookies) + count=$(ip netns exec $ns2 nstat -as | grep MPTcpExtMPJoinSynAckRx | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$syn_ack_nr" ]; then # simult connections exceeding the limit with cookie enabled could go up to @@ -1151,7 +1151,7 @@ chk_join_nr() fi echo -n " - ack" - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinAckRx | awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinAckRx | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$ack_nr" ]; then echo "[fail] got $count JOIN[s] ack expected $ack_nr" @@ -1184,9 +1184,9 @@ chk_stale_nr() local recover_nr printf "%-${nr_blank}s %-18s" " " "stale" - stale_nr=`ip netns exec $ns nstat -as | grep MPTcpExtSubflowStale | awk '{print $2}'` + stale_nr=$(ip netns exec $ns nstat -as | grep MPTcpExtSubflowStale | awk '{print $2}') [ -z "$stale_nr" ] && stale_nr=0 - recover_nr=`ip netns exec $ns nstat -as | grep MPTcpExtSubflowRecover | awk '{print $2}'` + recover_nr=$(ip netns exec $ns nstat -as | grep MPTcpExtSubflowRecover | awk '{print $2}') [ -z "$recover_nr" ] && recover_nr=0 if [ $stale_nr -lt $stale_min ] || @@ -1222,10 +1222,10 @@ chk_add_nr() local dump_stats local timeout - timeout=`ip netns exec $ns1 sysctl -n net.mptcp.add_addr_timeout` + timeout=$(ip netns exec $ns1 sysctl -n net.mptcp.add_addr_timeout) printf "%-${nr_blank}s %s" " " "add" - count=`ip netns exec $ns2 nstat -as MPTcpExtAddAddr | grep MPTcpExtAddAddr | awk '{print $2}'` + count=$(ip netns exec $ns2 nstat -as MPTcpExtAddAddr | grep MPTcpExtAddAddr | awk '{print $2}') [ -z "$count" ] && count=0 # if the test configured a short timeout tolerate greater then expected @@ -1239,7 +1239,7 @@ chk_add_nr() fi echo -n " - echo " - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtEchoAdd | awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtEchoAdd | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$echo_nr" ]; then echo "[fail] got $count ADD_ADDR echo[s] expected $echo_nr" @@ -1251,7 +1251,7 @@ chk_add_nr() if [ $port_nr -gt 0 ]; then echo -n " - pt " - count=`ip netns exec $ns2 nstat -as | grep MPTcpExtPortAdd | awk '{print $2}'` + count=$(ip netns exec $ns2 nstat -as | grep MPTcpExtPortAdd | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$port_nr" ]; then echo "[fail] got $count ADD_ADDR[s] with a port-number expected $port_nr" @@ -1262,8 +1262,8 @@ chk_add_nr() fi printf "%-${nr_blank}s %s" " " "syn" - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinPortSynRx | - awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinPortSynRx | + awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$syn_nr" ]; then echo "[fail] got $count JOIN[s] syn with a different \ @@ -1275,8 +1275,8 @@ chk_add_nr() fi echo -n " - synack" - count=`ip netns exec $ns2 nstat -as | grep MPTcpExtMPJoinPortSynAckRx | - awk '{print $2}'` + count=$(ip netns exec $ns2 nstat -as | grep MPTcpExtMPJoinPortSynAckRx | + awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$syn_ack_nr" ]; then echo "[fail] got $count JOIN[s] synack with a different \ @@ -1288,8 +1288,8 @@ chk_add_nr() fi echo -n " - ack" - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinPortAckRx | - awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinPortAckRx | + awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$ack_nr" ]; then echo "[fail] got $count JOIN[s] ack with a different \ @@ -1301,8 +1301,8 @@ chk_add_nr() fi printf "%-${nr_blank}s %s" " " "syn" - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMismatchPortSynRx | - awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtMismatchPortSynRx | + awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$mis_syn_nr" ]; then echo "[fail] got $count JOIN[s] syn with a mismatched \ @@ -1314,8 +1314,8 @@ chk_add_nr() fi echo -n " - ack " - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMismatchPortAckRx | - awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtMismatchPortAckRx | + awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$mis_ack_nr" ]; then echo "[fail] got $count JOIN[s] ack with a mismatched \ @@ -1361,7 +1361,7 @@ chk_rm_nr() fi printf "%-${nr_blank}s %s" " " "rm " - count=`ip netns exec $addr_ns nstat -as | grep MPTcpExtRmAddr | awk '{print $2}'` + count=$(ip netns exec $addr_ns nstat -as | grep MPTcpExtRmAddr | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$rm_addr_nr" ]; then echo "[fail] got $count RM_ADDR[s] expected $rm_addr_nr" @@ -1372,7 +1372,7 @@ chk_rm_nr() fi echo -n " - rmsf " - count=`ip netns exec $subflow_ns nstat -as | grep MPTcpExtRmSubflow | awk '{print $2}'` + count=$(ip netns exec $subflow_ns nstat -as | grep MPTcpExtRmSubflow | awk '{print $2}') [ -z "$count" ] && count=0 if [ -n "$simult" ]; then local cnt=$(ip netns exec $addr_ns nstat -as | grep MPTcpExtRmSubflow | awk '{print $2}') @@ -1414,7 +1414,7 @@ chk_prio_nr() local dump_stats printf "%-${nr_blank}s %s" " " "ptx" - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPPrioTx | awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtMPPrioTx | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$mp_prio_nr_tx" ]; then echo "[fail] got $count MP_PRIO[s] TX expected $mp_prio_nr_tx" @@ -1425,7 +1425,7 @@ chk_prio_nr() fi echo -n " - prx " - count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPPrioRx | awk '{print $2}'` + count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtMPPrioRx | awk '{print $2}') [ -z "$count" ] && count=0 if [ "$count" != "$mp_prio_nr_rx" ]; then echo "[fail] got $count MP_PRIO[s] RX expected $mp_prio_nr_rx" @@ -1444,8 +1444,10 @@ chk_link_usage() local link=$2 local out=$3 local expected_rate=$4 - local tx_link=`ip netns exec $ns cat /sys/class/net/$link/statistics/tx_bytes` - local tx_total=`ls -l $out | awk '{print $5}'` + + local tx_link tx_total + tx_link=$(ip netns exec $ns cat /sys/class/net/$link/statistics/tx_bytes) + tx_total=$(ls -l $out | awk '{print $5}') local tx_rate=$((tx_link * 100 / $tx_total)) local tolerance=5 -- 2.30.2