examples/var_service/supplicant_if: new service example

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

examples/var_service/supplicant_if/README

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+The real README file is one directory up.
+
+This directory's run script can have useful comments.
+If it doesn't but you feel it should, please send a patch
+to busybox's mailing list.

examples/var_service/supplicant_if/log/run

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+#!/bin/sh
+
+user=logger
+
+logdir="/var/log/service/`(cd ..;basename $PWD)`"
+mkdir -p "$logdir" 2>/dev/null
+chown -R "$user": "$logdir"
+chmod -R go-rwxst,u+rwX "$logdir"
+rm -rf logdir
+ln -s "$logdir" logdir
+
+# make this dir accessible to logger
+chmod a+rX .
+
+exec >/dev/null
+exec 2>&1
+exec \
+env - PATH="$PATH" \
+softlimit \
+setuidgid "$user" \
+svlogd -tt "$logdir"

examples/var_service/supplicant_if/p_log

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+#!/bin/sh
+
+cd log/logdir || exit 1
+cat @* current | $PAGER

examples/var_service/supplicant_if/run

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+#!/bin/sh
+
+exec 2>&1
+exec </dev/null
+
+pwd="$PWD"
+
+if="${PWD##*/dhcp_}"
+
+echo "* Upping iface $if"
+ip link set dev "$if" up
+
+##echo "* Powersave disable on $if"
+##iw dev "$if" set power_save off
+
+echo "* Starting wpa_supplicant"
+exec \
+env - PATH="$PATH" \
+softlimit \
+setuidgid root \
+wpa_supplicant -i "$if" -c "$pwd/wpa_supplicant.conf" -d

examples/var_service/supplicant_if/w_log

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+#!/bin/sh
+
+cd log/logdir || exit 1
+watch -n2 'w=`ttysize w`; h=`ttysize h`; tail -$((h-3)) current 2>&1 | cut -b1-$((w-2))'

examples/var_service/supplicant_if/wpa_supplicant.conf

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+# allow frontend (e.g., wpa_cli) to be used by all users in 'wheel' group
+ctrl_interface=DIR=/var/run/wpa_supplicant
+#GROUP=wheel
+
+# Typical minimal wifi setup:
+network={
+    ssid="--your-ESSID--"
+    key_mgmt=WPA-PSK
+    psk="--your-password--"
+}
+
+# Other fields:
+#    scan_ssid=1
+#    key_mgmt=WPA-EAP WPA-PSK IEEE8021X NONE
+#    pairwise=CCMP TKIP
+#    group=CCMP TKIP WEP104 WEP40
+#    psk="very secret passphrase"
+#    eap=TTLS PEAP TLS
+#    identity="user@example.com"
+#    ca_cert="/etc/cert/ca.pem"
+#    client_cert="/etc/cert/user.pem"
+#    private_key="/etc/cert/user.prv"
+#    private_key_passwd="password"
+#    phase1="peaplabel=0"
+#    ca_cert2="/etc/cert/ca2.pem"
+#    client_cert2="/etc/cer/user.pem"
+#    private_key2="/etc/cer/user.prv"
+#    private_key2_passwd="password"