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test: In demos, use pgrep instead of pstree to find namespace PID

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Parsing pstree's output is somewhat unreliable: there might be
multiple pasta instances running on the same host, and depending on
the overall output width pstree might truncate some branches.

Ask pasta to save its PID to file, and use that as parameter for
pgrep to find the PID of the interactive shell whose user and network
namespaces we want to join.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2022-07-21 13:53:21 +02:00
parent 95f7b4ec3f
commit a4778b3b81
2 changed files with 6 additions and 8 deletions
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5
test/demo/passt
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@ -70,7 +70,7 @@ say 'pasta' demo above.
sleep 3
passt cd __TEMPDIR__/passt
passtb ./pasta
passtb ./pasta -P /tmp/pasta.pid
sleep 3
passt /sbin/dhclient -4 --no-pid
sleep 2
@ -83,8 +83,7 @@ say Now let's run 'passt' in the new namespace, and
nl
say enter this namespace from the guest terminal too.
sleep 3
guest pstree -p | grep pasta
gout TARGET_PID pstree -p | grep pasta | sed -n 's/.*(\([0-9].*\))$/\1/p'
gout TARGET_PID pgrep -P $(cat /tmp/pasta.pid)
sleep 1
passtb ./passt -f -t 5201,5203

9
test/demo/pasta
View file

@ -48,7 +48,7 @@ nl
say without PID, it will create a namespace.
sleep 3
passt cd __TEMPDIR__/passt
passtb ./pasta
passtb ./pasta -P /tmp/pasta.pid
sleep 3
nl
@ -57,8 +57,7 @@ say For convenience, let's enter this namespace
nl
say from another terminal.
sleep 3
ns pstree -p | grep pasta
nsout TARGET_PID pstree -p | grep pasta | sed -n 's/.*(\([0-9].*\))$/\1/p'
nsout TARGET_PID pgrep -P $(cat /tmp/pasta.pid)
sleep 1
ns nsenter -t __TARGET_PID__ -U -n --preserve-credentials
@ -171,10 +170,10 @@ passt exit
passt make clean
passt CFLAGS="-g" make
sleep 2
passtb perf record -g ./pasta
passtb perf record -g ./pasta -P /tmp/pasta.pid
sleep 2
nsout TARGET_PID pstree -p | grep pasta | sed -n 's/.*(\([0-9].*\))$/\1/p'
nsout TARGET_PID pgrep -P $(cat /tmp/pasta.pid)
sleep 1
ns nsenter -t __TARGET_PID__ -U -n --preserve-credentials
sleep 5