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[Bug testsuite/16326] client.exp and local stap-server interactions

https://sourceware.org/bugzilla/show_bug.cgi?id=16326

--- Comment #6 from Martin Cermak <mcermak at redhat dot com> ---
Created attachment 7329
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7329&action=edit
logfile acquired using client.exp 8b68fe58c64f

Not yet there. The testcase fails in case there is a local trusted server
*running*.

Have one local and one remote servers running before executing our testcase.
Now edit the testcase like this:

verbose -log "SLEEP..."
exec sleep 40

# Now start our own server and make sure we can work with it.
if {! [setup_server] || $avahi_ok_p != 1} {
    untested "Compile-server client tests against a server"
    return;
}

verbose -log "SLEEP..."
exec sleep 40

1) check before running the testcase:

# stap --list-servers=all; stap --list-servers=online; stap
--list-servers=signer; stap --list-servers=trusted
Systemtap Compile Server Status for 'all'
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
Systemtap Compile Server Status for 'online'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
Systemtap Compile Server Status for 'signer'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
Systemtap Compile Server Status for 'trusted'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"

2) check within the first sleep

# stap --list-servers=all; stap --list-servers=online; stap
--list-servers=signer; stap --list-servers=trusted
Systemtap Compile Server Status for 'all'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
Systemtap Compile Server Status for 'online'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
Systemtap Compile Server Status for 'signer'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
Systemtap Compile Server Status for 'trusted'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"

3) check within the second sleep

# stap --list-servers=all; stap --list-servers=online; stap
--list-servers=signer; stap --list-servers=trusted
Systemtap Compile Server Status for 'all'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=60632
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b9:55:00"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
 host=box1 address=YY.YY.YY.YY port=48702 sysinfo="3.10.0-55.el7.x86_64 x86_64"
version=2.4 certinfo="00:9d:a3:a2:73"
 host=box1.blah.redhat.com address=offline port=unknown sysinfo="unknown"
version=unknown certinfo="00:9d:a3:a2:73"
Systemtap Compile Server Status for 'online'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=60632
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b9:55:00"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
 host=box1 address=YY.YY.YY.YY port=48702 sysinfo="3.10.0-55.el7.x86_64 x86_64"
version=2.4 certinfo="00:9d:a3:a2:73"
Systemtap Compile Server Status for 'signer'
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
 host=box1 address=YY.YY.YY.YY port=48702 sysinfo="3.10.0-55.el7.x86_64 x86_64"
version=2.4 certinfo="00:9d:a3:a2:73"
 host=box1.blah.redhat.com address=offline port=unknown sysinfo="unknown"
version=unknown certinfo="00:9d:a3:a2:73"
Systemtap Compile Server Status for 'trusted'
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
 host=box1 address=YY.YY.YY.YY port=48702 sysinfo="3.10.0-55.el7.x86_64 x86_64"
version=2.4 certinfo="00:9d:a3:a2:73"
 host=box1.blah.redhat.com address=offline port=unknown sysinfo="unknown"
version=unknown certinfo="00:9d:a3:a2:73"

4) check after the testcasse finish

# stap --list-servers=all; stap --list-servers=online; stap
--list-servers=signer; stap --list-servers=trusted
Systemtap Compile Server Status for 'all'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
Systemtap Compile Server Status for 'online'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
Systemtap Compile Server Status for 'signer'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
Systemtap Compile Server Status for 'trusted'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"

I see 3 issues:

1) After *careful* text-diffing these outputs it appears that one can't rely on
the line order produced by --list-servers, which may complicate array key-val
comparisons in the testcase.

2) I'm a bit confused about what happens when additional local server is
started: Let's have following initial state:

# stap --list-servers=all; netstat -tlpn | grep stap
Systemtap Compile Server Status for 'all'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=48702
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
tcp6       0      0 :::48702                :::*                    LISTEN     
27016/stap-serverd

Now let's fire up an extra local server by executing
`/usr/libexec/systemtap/stap-serv --log=/tmp/mystaplog` under some regular user
(this is what the testcase does). Now I got:

# stap --list-servers=all; netstat -tlpn | grep stap
Systemtap Compile Server Status for 'all'
 host=box1.blah.redhat.com address=YY.YY.YY.YY port=35053
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b9:70:b9"
 host=box3.blah.redhat.com address=XX.XX.XX.XX port=56334
sysinfo="3.10.0-61.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b8:18:bb"
 host=box1 address=YY.YY.YY.YY port=48702 sysinfo="3.10.0-55.el7.x86_64 x86_64"
version=2.4 certinfo="00:9d:a3:a2:73"
 host=box1.blah.redhat.com address=offline port=unknown sysinfo="unknown"
version=unknown certinfo="00:9d:a3:a2:73"
tcp6       0      0 :::35053                :::*                    LISTEN     
17991/stap-serverd
tcp6       0      0 :::48702                :::*                    LISTEN     
27016/stap-serverd

Not sure what does "host=box1.blah.redhat.com address=offline" mean..

3) It might be useful to move those newly created array_* procs to some shared
library, possibly lib/systemtap.exp

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