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expect: Add (back) a simple test for PTY

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We used to run "expect -c 'spawn ls'" for this in Binutils, but then we
thought expect test suite was enough as such a simple PTY test.  However
expect test can fail due to some different reason, so add back a simple
test using Python pty module before building expect.  Now we no longer
need to consider expect test critical (IIRC there was a report saying
one expect test failed for unknown reason but all other things OK).
This commit is contained in:
Xi Ruoyao 2024-02-06 01:00:53 +08:00
parent ce11e97f01
commit 1fde756b12
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1 changed files with 19 additions and 17 deletions
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36
chapter08/expect.xml
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@ -48,6 +48,25 @@
<sect2 role="installation">
<title>Installation of Expect</title>
<para>Expect needs PTYs to work. Verify that the PTYs are working
properly inside the chroot environment by performing a simple
test:</para>
<screen><userinput remap="test">python3 -c 'from pty import spawn; spawn(["echo", "ok"])'</userinput></screen>
<para>This command should output <computeroutput>ok</computeroutput>.
If, instead, the output includes <computeroutput>OSError: out of pty
devices</computeroutput>, then the environment is not set up for proper
PTY operation. You need to exit from the chroot environment, read
<xref linkend='ch-tools-kernfs'/> again, and ensure the
<systemitem class="filesystem">devpts</systemitem> file system (and
other virtual kernel file systems) mounted correctly. Then reenter
the chroot environment following <xref linkend='ch-tools-chroot'/>.
This issue needs to be resolved before continuing, or the test suites
requring Expect (for example the test suites of Bash, Binutils, GCC,
GDBM, and of course Expect itself) will fail catastrophically, and other
subtle breakages may also happen.</para>
<para>Prepare Expect for compilation:</para>
<screen><userinput remap="configure">./configure --prefix=/usr \
@ -82,27 +101,10 @@
<screen><userinput remap="make">make</userinput></screen>
<important>
<para>The test suite for Expect is considered critical.
Do not skip it under any circumstances.</para>
</important>
<para>To test the results, issue:</para>
<screen><userinput remap="test">make test</userinput></screen>
<para>If any test fails with the message
<computeroutput>The system has no more ptys. Ask your system
administrator to create more</computeroutput>, it indicates
you've not mounted the
<systemitem class="filesystem">devpts</systemitem> file system
correctly. You need to exit from the chroot environment, read
<xref linkend='ch-tools-kernfs'/> again, and ensure the
<systemitem class="filesystem">devpts</systemitem> file system (and
other virtual kernel file systems) mounted correctly. Then reenter
the chroot environment following <xref linkend='ch-tools-chroot'/>.
This issue needs to be resolved before continuing.</para>
<para>Install the package:</para>
<screen><userinput remap="install">make install