Description:
I want to configure my wireless connection in "adhoc-mode".

Here is my profile, according the wiki instructions http://wiki.archlinux.org/index.php/Netcfg#Execute_commands_before.2Fafter_interface_up.2Fdown :

CONNECTION='wireless'
DESCRIPTION='A simple WEP encrypted wireless connection'
INTERFACE='eth1'
SECURITY='wep'
ESSID='tomato'
KEY='86AAD51EB12345A43077F52C6B6'
PRE_UP="ifconfig eth0 down; iwconfig eth0 mode ad-hoc"
IP='dhcp'

The connection fails with this debugging output :

# NETCFG_DEBUG="yes" netcfg -u wireless-tomato
DEBUG: Loading profile wireless-tomato
DEBUG: Configuring interface eth1
:: wireless-tomato up [BUSY] DEBUG: status reported to profile_up as:
DEBUG: Loading profile wireless-tomato
DEBUG: Configuring interface eth1
DEBUG: wireless_up stop_wpa eth1
DEBUG: wireless_up ifup
DEBUG: wireless_up Configuration generated at /tmp/wpa.eth1/wpa.conf
DEBUG: wireless_up start_wpa eth1 /tmp/wpa.eth1/wpa.conf wext
DEBUG: wireless_up wpa_check

> WPA Authentication/Association Failed
DEBUG: profile_up connect failed

Here is the file /tmp/wpa.eth1/wpa.conf produced by netcfg :

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
network={
ssid="tomato"
key_mgmt=NONE
wep_key0=86AAD51EB12345A43077F52C6B6
wep_tx_keyidx=0
}


I notice that wpa_supplicant switch back my wifi device in managed mode after executing the PRE_UP commands. To work in adhoc-mode, the configuration file must look like that :

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
ap_scan=2
network={
mode=1
ssid="tomato"
key_mgmt=NONE
wep_key0=86AAD51EB12345A43077F52C6B6
wep_tx_keyidx=0
}

a small patch is attached to this bug report.