[lfs] branch trunk updated: systemd: run the test suite in a separate mount namespace

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git pushed a commit to branch trunk
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The following commit(s) were added to refs/heads/trunk by this push:
     new 2d0c43a31 systemd: run the test suite in a separate mount namespace
2d0c43a31 is described below

commit 2d0c43a315d6d2b0b2d676ba8109ca4ac0e3c24a
Author: Xi Ruoyao <[email protected]>
AuthorDate: Sat Jan 31 22:06:34 2026 +0800

    systemd: run the test suite in a separate mount namespace
    
    The systemd test suite creates a mountpoint in /tmp, causing an error in
    Cleaning Up at the end of Ch. 08:
    
        rm: cannot remove '/tmp/not-mounted-gQSHWD/regular': Device or resource busy
    
    Run the test suite in a separate mount namespace so the mount point gets
    invisible to everything except the test suite and cleaned up after the
    test suite finishes.
---
 chapter08/systemd.xml | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/chapter08/systemd.xml b/chapter08/systemd.xml
index 7fee06900..cbb43cd76 100644
--- a/chapter08/systemd.xml
+++ b/chapter08/systemd.xml
@@ -216,11 +216,16 @@ meson setup ..                \
 
 <screen><userinput remap="make">ninja</userinput></screen>
 
-    <para>Some tests need a basic <filename>/etc/os-release</filename> file.
-    To test the results, issue:</para>
+    <para>One test creates a mount point in
+    <filename class='directory'>/tmp</filename> that we cannot clean up so
+    easily after running the test suite, and some tests need a basic
+    <filename>/etc/os-release</filename> file.  To test the results, create
+    this file and run the test suite in a separate mount namespace (so the
+    mount point is only visible for the test suite and it gets cleaned up
+    automatically after the test suite finishes):</para>
 
 <screen><userinput remap="test">echo 'NAME="Linux From Scratch"' &gt; /etc/os-release
-ninja test</userinput></screen>
+unshare -m ninja test</userinput></screen>
 
     <!-- test-namespace needs /run/systemd/inaccessible/sock, which only exists
          after initializing the system with systemd.  -->

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