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This patch adds some helper scripts that make talking to a given
testenv's namespace slightly easier.
One of the really cool things about namespaces is you can run multiple
different programs that can all talk to the testenv DC. However, the
command to do this is a bit unweildly, it's based on PID so it changes
everytime you start up a testenv, and you loose all the environment
variables that selftest normally sets up.
This patch adds a couple of helper scripts:
- nsenter-helper.sh: this takes the variables defined in an exports_file
and exports them all. It prints some basic help and then starts a new
shell session (this whole script gets run in the new namespace).
Essentially this achieves something similar to the legacy
selftest-vars.sh script (except this one actually works).
- mk_nsenter.sh: this generates a simple wrapper script that'll run
nsenter and then call nsenter-helper.sh. A separate wrapper script
gets created for each testenv. E.g. to run it, just go:
./st/ad_dc/nsenter.sh
This is a wrapper for a more complicated command underneath like:
nsenter -t 437353 --net --user --preserve-credentials \
/home/timbeale/code/samba/selftest/ns/nsenter-helper.sh \
/home/timbeale/code/samba/st/ad_dc/exports.sh
Signed-off-by: Tim Beale <timbeale@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
62 lines
2.4 KiB
Bash
Executable File
62 lines
2.4 KiB
Bash
Executable File
#!/bin/sh
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#
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# Starts samba in a separate namespace. This gets passed the interface/IP
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# to use, as well as the Samba command to run. The whole script gets run
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# (via unshare) in a separate namespace.
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# the first 3 args are our interface-name, parent-PID, and a exports file
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# containing environment variables ($SERVER, $SERVER_IP, etc)
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interface=$1
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exports_file=$2
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parent_pid=$3
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# we write the testenv environment variables to file, which makes it easier
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# to work out the $SERVER, $SERVER_IP, etc
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. $exports_file
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# The namespaces we use are anonymous, which means other processes would need
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# to use our PID to access the new namespace
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echo "-------------------------------------------------------------"
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echo "Created namespace for $NETBIOSNAME ($ENVNAME) PID $$"
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# generate a helper script if the developer wants to talk to this namespace
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# in another shell
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mk_nsenter_script="$(dirname $0)/mk_nsenter.sh"
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helper_script=$($mk_nsenter_script $$ $exports_file)
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echo "To communicate with this testenv, use: $helper_script"
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echo "-------------------------------------------------------------"
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# the rest of the args are the samba command to run
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shift 3
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SAMBA_CMD=$@
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# make sure namespace loopback is up (it's needed for ping, etc)
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ip link set dev lo up
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# Create the interfaces needed for communication between namespaces.
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# We use a veth pair, which acts as a tunnel between the namespaces.
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# One end of the veth link is added to a common bridge in the top-level (i.e.
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# selftest) namespace, and the other end is added to the testenv's namespace.
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# This means each testenv DC is in its own namespace, but they can talk to
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# each other via the common bridge interface.
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# The new veth interfaces are named "vethX" and "vethX-br", where
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# X = the testenv IP (i.e. Samba::get_interface()). E.g. ad_dc = veth30,
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# and veth30-br.
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# The "vethX" interface will live in the new testenv's namespace.
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# The "vethX-br" end is added to the bridge in the main selftest namespace.
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ip link add dev $interface-br type veth peer name $interface
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# move the bridge end of the link back into the parent namespace.
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ip link set $interface-br netns $parent_pid
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# configure our IP address and bring the interface up
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ip addr add $SERVER_IP/24 dev $interface
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# Note that samba can't bind to the IPv6 address while DAD is in progress,
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# so we use 'nodad' when configuring the address
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ip addr add $SERVER_IPV6/112 dev $interface nodad
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ip link set dev $interface up
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# start samba
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$SAMBA_CMD
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