Adjust instructions for /dev/shm when creating virtual filesystems.

Some host create /dev/shm as a tmpfs.  Some have is as
a symlink to a location in another directory.  This
change handles both cases.

The change to the sysV bootscripts now creates /dev/shm
as a separate tmpfs from /run.  This makes LFS sysV and
systemd versions treat /dev/shm the same.

bootscripts/ChangeLog

@@ -1,3 +1,6 @@
+2022-09-30 Bruce Dubbs <bdubbs@linuxfromscratch.org>
+   * Mount /dev/shm as a tmpfs.
+
 2022-07-23 Thomas Trepl <thomas@linuxfromscratch.org>
    * Mark an raid array clean when root (/) has been remounted
      r/o when system goes down. Otherwise, array does remain

bootscripts/lfs/init.d/mountvirtfs

@@ -38,8 +38,8 @@ case "${1}" in
          mount /run || failed=1
       fi
 
-      mkdir -p /run/lock /run/shm
+      mkdir -p   /run/lock 
-      chmod 1777 /run/shm /run/lock
+      chmod 1777 /run/lock
 
       log_info_msg "Mounting virtual file systems: ${INFO}/run"
 
@@ -58,7 +58,9 @@ case "${1}" in
          mount -o mode=0755,nosuid /dev  || failed=1
       fi
 
-      ln -sfn /run/shm /dev/shm
+      mkdir -p /dev/shm
+      log_info_msg2 " ${INFO}/dev/shm"
+      mount -o nosuid,nodev /dev/shm || failed=1
 
       (exit ${failed})
       evaluate_retval

chapter01/changelog.xml

@@ -40,6 +40,17 @@
     appropriate for the entry or if needed the entire day's listitem.
     -->
 
+    <listitem>
+      <para>2022-09-20</para>
+      <itemizedlist>
+        <listitem>
+          <para>[bdubbs] - Adappt instructions depending on 
+          host setup of /dev/shm when creating virtual filesystems
+          for chroot.</para>
+        </listitem>
+      </itemizedlist>
+    </listitem>
+
     <listitem>
       <para>2022-09-15</para>
       <itemizedlist>

chapter07/cleanup.xml

@@ -95,7 +95,8 @@
 
     <para>Before making a backup, unmount the virtual file systems:</para>
 
-<screen role="nodump"><userinput>umount $LFS/dev/pts
+<screen role="nodump"><userinput>[ mountpoint -q $LFS/dev/shm ] &amp;&amp; umount $LFS/dev/shm
+umount $LFS/dev/pts
 umount $LFS/{sys,proc,run,dev}</userinput></screen>
 
     <para>

chapter07/kernfs.xml

@@ -89,8 +89,15 @@ mount -vt tmpfs tmpfs $LFS/run</userinput></screen>
       The /run tmpfs was mounted above so in this case only a
       directory needs to be created.</para>
 
+      <para>In other cases <filename>/dev/shm</filename> is a mountpoint 
+      for a tmpfs. In that case the mount of /dev above will only create
+      /dev/shm in the chroot environment as a directory. In this situation
+      we explicitly mount a tmpfs,</para>
+
 <screen><userinput>if [ -h $LFS/dev/shm ]; then
   mkdir -pv $LFS/$(readlink $LFS/dev/shm)
+else
+  mount -t tmpfs -o nosuid,nodev tmpfs $LFS/dev/shm
 fi</userinput></screen>
 
   </sect2>

chapter10/fstab.xml

@@ -32,6 +32,7 @@ sysfs          /sys         sysfs    nosuid,noexec,nodev 0     0
 devpts         /dev/pts     devpts   gid=5,mode=620      0     0
 tmpfs          /run         tmpfs    defaults            0     0
 devtmpfs       /dev         devtmpfs mode=0755,nosuid    0     0
+tmpfs          /dev/shm     tmpfs    nosuid,nodev        0     0
 
 # End /etc/fstab</literal>
 EOF</userinput></screen>

chapter11/afterlfs.xml

@@ -129,7 +129,12 @@ mounttype dev/pts devpts devpts -o gid=5,mode=620
 mounttype proc    proc   proc
 mounttype sys     sysfs  sysfs
 mounttype run     tmpfs  run
-mkdir $LFS/run/shm
+if [ -h $LFS/dev/shm ]; then
+  mkdir -pv $LFS/$(readlink $LFS/dev/shm)
+else
+  mounttype dev/shm tmpfs tmpfs -o nosuid,nodev
+fi 
+
 #mountbind usr/src
 #mountbind boot
 #mountbind home

packages.ent

@@ -382,7 +382,7 @@
 <!ENTITY less-fin-du "4.2 MB">
 <!ENTITY less-fin-sbu "less than 0.1 SBU">
 
-<!ENTITY lfs-bootscripts-version "20220723">      <!-- Scripts depend on this format -->
+<!ENTITY lfs-bootscripts-version "20220920">      <!-- Scripts depend on this format -->
 <!ENTITY lfs-bootscripts-size "BOOTSCRIPTS-SIZE KB">
 <!ENTITY lfs-bootscripts-url "&downloads-root;lfs-bootscripts-&lfs-bootscripts-version;.tar.xz">
 <!ENTITY lfs-bootscripts-md5 "BOOTSCRIPTS-MD5SUM">