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lxc-attach: update and improve tests
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>
This commit is contained in:
Christian Brauner
parent
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@ -6,7 +6,7 @@
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# Christian Brauner <christian.brauner@mailbox.org>
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#
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# This is a test script for the lxc-attach program. It tests whether I/O
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# redirection works correctly.
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# redirection and pty allocation works correctly.
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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@ -24,6 +24,25 @@
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set -e
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# NOTE:
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# lxc-attach allocates a pty on the host and attaches any standard file
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# descriptors that refer to a pty to it. Standard file descriptors which do not
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# refer to a pty are not attached. In order to determine whether lxc-attach
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# works correctly we test various methods of redirection on the host. E.g.:
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#
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# lxc-attach -n busy -- hostname < /dev/null
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#
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# This is done to check whether the file descriptor that gets redirected to
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# /dev/null is (a) left alone and (b) that lxc-attach does not fail. When
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# lxc-attach fails we know that it's behavior has been altered, e.g. by trying
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# to attach a standard file descriptor that does not refer to a pty.
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# The small table preceeding each test case show which standard file descriptors
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# we expect to be attached to a pty and which we expect to be redirected. E.g.
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#
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# stdin --> attached to pty
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# stdout --> attached to pty
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# stderr --> attached to pty
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FAIL() {
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echo -n "Failed " >&2
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echo "$*" >&2
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@ -31,103 +50,129 @@ FAIL() {
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exit 1
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}
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# Create a container, start it and wait for it to be in running state
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# Create a container, start it and wait for it to be in running state.
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lxc-create -t busybox -n busy || FAIL "creating busybox container"
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lxc-start -n busy -d || FAIL "starting busybox container"
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lxc-wait -n busy -s RUNNING || FAIL "waiting for busybox container to run"
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# Test if simple attach is working
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# - stdin --> attached to pty
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# - stdout --> attached to pty
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# - stderr --> attached to pty
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attach=$(lxc-attach -n busy -- hostname) # expect output
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# stdin --> attached to pty
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# stdout --> attached to pty
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# stderr --> attached to pty
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attach=$(lxc-attach -n busy -- hostname || FAIL " to allocate or setup pty")
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if [ "$attach" != "busy" ]; then
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FAIL " simple attach"
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fi
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# Test if we still receive output when stdin does not refer to a tty
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# - stdin --> /dev/null
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# - stdout --> attached to pty
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# - stderr --> attached to pty
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attach=$(lxc-attach -n busy -- hostname < /dev/null) # expect output
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# stdin --> /dev/null
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# stdout --> attached to pty
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# stderr --> attached to pty
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attach=$(lxc-attach -n busy -- hostname < /dev/null || FAIL " to allocate or setup pty")
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if [ "$attach" != "busy" ]; then
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FAIL " with stdin redirection < /dev/null"
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FAIL " lxc-attach -n busy -- hostname < /dev/null"
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fi
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# Test if we are silent when stdout does not refer to a tty
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# - stdin --> attached to pty
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# - stdout --> /dev/null
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# - stderr --> attached to pty
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attach=$(lxc-attach -n busy -- hostname > /dev/null) # expect no output
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# stdin --> attached to pty
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# stdout --> /dev/null
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# stderr --> attached to pty
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attach=$(lxc-attach -n busy -- hostname > /dev/null || FAIL " to allocate or setup pty")
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if [ -n "$attach" ]; then
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FAIL " with stdout redirection > /dev/null"
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FAIL " lxc-attach -n busy -- hostname > /dev/null"
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fi
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# Test if we are silent when stdout and stdin do not refer to a tty
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# - stdin --> /dev/null
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# - stdout --> /dev/null
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# - stderr --> attached to pty
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attach=$(lxc-attach -n busy -- hostname > /dev/null < /dev/null) # expect no output
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# stdin --> attached to pty
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# stdout --> attached to pty
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# stderr --> /dev/null
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attach=$(lxc-attach -n busy -- hostname 2> /dev/null || FAIL " to allocate or setup pty")
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if [ "$attach" != "busy" ]; then
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FAIL " lxc-attach -n busy -- hostname 2> /dev/null < /dev/null"
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fi
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# stdin --> /dev/null
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# stdout --> attached to pty
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# stderr --> /dev/null
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attach=$(lxc-attach -n busy -- hostname 2> /dev/null < /dev/null || FAIL " to allocate or setup pty")
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if [ "$attach" != "busy" ]; then
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FAIL " lxc-attach -n busy -- hostname 2> /dev/null < /dev/null"
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fi
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# Use a synthetic reproducer in container to produce output on stderr. stdout on
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# the host gets redirect to /dev/null. We should still be able to receive
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# containers output on stderr on the host. (The command is run in a subshell.
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# This allows us to redirect stderr to stdout for the subshell and capture the
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# output in the attach variable.)
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# stdin --> attached to pty
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# stdout --> /dev/null
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# stderr --> attached to pty
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attach=$( ( lxc-attach -n busy -- sh -c 'hostname >&2' > /dev/null ) 2>&1 || FAIL " to allocate or setup pty")
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if [ "$attach" != "busy" ]; then
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FAIL " lxc-attach -n busy -- sh -c 'hostname >&2' > /dev/null"
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fi
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# Use a synthetic reproducer in container to produce output on stderr. stderr on
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# the host gets redirect to /dev/null. We should not receive output on stderr on
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# the host. (The command is run in a subshell. This allows us to redirect stderr
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# to stdout for the subshell and capture the output in the attach variable.)
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# stdin --> attached to pty
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# stdout --> attach to pty
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# stderr --> /dev/null
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attach=$( ( lxc-attach -n busy -- sh -c 'hostname >&2' 2> /dev/null ) 2>&1 || FAIL " to allocate or setup pty")
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if [ -n "$attach" ]; then
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FAIL " with stdin and stdout redirection > /dev/null < /dev/null"
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FAIL " lxc-attach -n busy -- sh -c 'hostname >&2' 2> /dev/null"
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fi
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# Test if we still receive output when stdin and stderr do not refer to a tty
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# - stdin --> /dev/null
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# - stdout --> attached to pty
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# - stderr --> /dev/null
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attach=$(lxc-attach -n busy -- hostname 2> /dev/null < /dev/null) # expect output
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if [ "$attach" != "busy" ]; then
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FAIL " with stdin and stderr redirection 2> /dev/null < /dev/null"
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# stdin --> attached to pty
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# stdout --> /dev/null
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# stderr --> attached to pty
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# (As we expect the exit code of the command to be 1 we ignore it.)
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attach=$(lxc-attach -n busy -- sh -c 'rm 2>&1' > /dev/null || true)
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if [ -n "$attach" ]; then
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FAIL " lxc-attach -n busy -- sh -c 'rm 2>&1' > /dev/null"
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fi
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# - produce output on stderr in container
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# - redirect stdout on host to /dev/null
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# - output on host should be received on stderr
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# - to capture the ouput on stderr on the host we redirect stderr on the host to
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# stdout
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# - stdin --> attached to pty
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# - stdout --> /dev/null
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# - stderr --> attached to pty
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attach=$( ( lxc-attach -n busy -- sh -c 'hostname >&2' > /dev/null ) 2>&1 )
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if [ "$attach" != "busy" ]; then
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FAIL " bla sh -c 'hostname >&2' >/dev/null"
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fi
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# - produce output on stderr in container
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# - redirect stderr on host to /dev/null
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# - no output from container should be received on stderr on host
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# - stdin --> attached to pty
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# - stdout --> attached to pty
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# - stderr --> /dev/null
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attach=$( ( lxc-attach -n busy -- sh -c 'hostname >&2' 2> /dev/null ) 2>&1 )
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if [ -n "$attach" ]; then
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FAIL " bla sh -c 'hostname >&2' 2> /dev/null"
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# (As we expect the exit code of the command to be 1 we ignore it.)
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attach=$(lxc-attach -n busy -- sh -c 'rm 2>&1' 2> /dev/null || true)
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if [ -z "$attach" ]; then
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FAIL " lxc-attach -n busy -- sh -c 'rm 2>&1' 2> /dev/null"
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fi
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# Test file redirection
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# - stdin --> attached to pty
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# - stdout --> /dev/null
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# - stderr --> /dev/null
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# stdin --> $in
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# stdout --> attached to pty
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# stderr --> attached to pty
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attach=$(echo hostname | lxc-attach -n busy -- || FAIL " to allocate or setup pty")
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if [ "$attach" != "busy" ]; then
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FAIL " echo hostname | lxc-attach -n busy --"
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fi
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# stdin --> attached to pty
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# stdout --> $out
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# stderr --> $err
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out=$(mktemp /tmp/out_XXXX)
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err=$(mktemp /tmp/err_XXXX)
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lxc-attach -n busy -- sh -c 'echo OUT; echo ERR >&2' > $out 2> $err
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trap "rm -f $out $err" EXIT INT QUIT PIPE
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lxc-attach -n busy -- sh -c 'echo OUT; echo ERR >&2' > $out 2> $err || FAIL " to allocate or setup pty"
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outcontent=$(cat $out)
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errcontent=$(cat $err)
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if [ "$outcontent" != "OUT" ] || [ "$errcontent" != "ERR" ]; then
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FAIL " bla sh -c 'echo OUT; echo ERR >&2' > $out 2> $err"
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FAIL " lxc-attach -n busy -- sh -c 'echo OUT; echo ERR >&2' > $out 2> $err"
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fi
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# Test stdin input
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# - stdin --> $in
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# - stdout --> attached to pty
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# - stderr --> attached to pty
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in=$(mktemp /tmp/in_XXXX)
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echo '#!/bin/sh' > $in
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echo hostname >> $in
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attach=$(lxc-attach -n busy -- < $in)
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if [ "$attach" != "busy" ]; then
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FAIL " < $in"
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# stdin --> $in
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# stdout --> $out
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# stderr --> $err
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# (As we expect the exit code of the command to be 1 we ignore it.)
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out=$(mktemp /tmp/out_XXXX)
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err=$(mktemp /tmp/err_XXXX)
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trap "rm -f $out $err" EXIT INT QUIT PIPE
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echo "hostname; rm" | lxc-attach -n busy > $out 2> $err || true
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outcontent=$(cat $out)
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errcontent=$(cat $err)
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if [ "$outcontent" != "busy" ] || [ -z "$errcontent" ]; then
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FAIL " echo 'hostname; rm' | lxc-attach -n busy > $out 2> $err"
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fi
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lxc-destroy -n busy -f
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