* Simplify the population of the /etc memory filesystem. To avoid

    the null mount, we currently create a temporary mfs on /tmp, copy
    /etc to /tmp, then mount /etc as mfs and copy everything back from
    /tmp, then delete the /tmp mfs.

    The patch eliminates the temporary /tmp mfs and the subsequent
    copying and simply populates the /etc mfs by copying from
    /conf/default/etc.  This requires that /conf/default/etc contain a
    complete copy of all the /etc stuff instead of just overrides.  I
    don't think that is too much of an extra step in setting up a
    diskless environment.

  * Provide the ability to make /tmp a memory filesystem independent
    of /var.  This removes the requirement that /tmp be a symlink to
    /var/tmp and this makes the diskless code work with the default
    filesystem layout.  If a seperate /tmp memory filesystem is
    created, the 'tmpsize' environment variable is used to determine
    its size (default to 10 Meg).

  * Reduce diffs between the -current and -stable versions of these
    files to a bare minimum.  Only the definition of the shell
    function 'mount_md' is different.

Not Objected to by: -arch@, -small@

MFC after: 2 days

1 files changed, 18 insertions, 8 deletions

diff --git a/etc/rc.d/tmp b/etc/rc.d/tmp
index 37c1cf6..f297e24 100644
--- a/etc/rc.d/tmp
+++ b/etc/rc.d/tmp
@@ -29,10 +29,20 @@
 
 # PROVIDE: diskless
 # REQUIRE: initdiskless mountcritlocal
+# BEFORE: addswap random
+# KEYWORD: FreeBSD
 
+dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null`
+[ ${dlv:=0} -eq 0 ] && exit 0
+
+name="diskless2"
+
+# Provide a function for normalizing the mounting of memory
+# filesystems.  This should allow the rest of the code here to remain
+# as close as possible between 5-current and 4-stable.
 #   $1 = size
 #   $2 = mount point
-	/sbin/newfs /dev/md$3c
+#   $3 = md unit number (ignored in pre 5.0 systems)
 #   $4 = (optional) bytes-per-inode
 mount_md()
 {
@@ -46,7 +56,7 @@ mount_md()
 }
 
 echo "+++ mfs_mount of /var"
-mount_md ${varsize:=65536} /var 2
+mount_md ${varsize:=65536} /var 1
 if [ -r /etc/rc.subr ]; then
         . /etc/rc.subr
         load_rc_config $name
@@ -63,11 +73,11 @@ fi
 if [ -d /conf/default/etc ]; then
 	newaliases
 fi
-# We assume that /tmp is symlinked to /var/tmp on the shared root
-# partition. mount_null seems to have problems.
-#if [ ! -h /tmp -a ! -h /var/tmp ]; then
-#	mount_null /var/tmp /tmp
-#fi
+
+#
+# /var/tmp, otherwise, use a small memory filesystem for /tmp.
+	mount_md ${tmpsize:=20480} /tmp 2
+# so if /var/tmp == /tmp, then you don't get a vi.recover.
 #
 if [ ! -h /tmp ]; then
 	mount_md ${tmpsize:=64m} /tmp 2
@@ -75,7 +85,7 @@ if [ ! -h /tmp ]; then
 fi
 
 if sysctl vfs.devfs.generation > /dev/null 2>&1 ; then
-	mount_mfs -s 4096 -i 512 -T qp120at dummy /dev
+	# we have DEVFS, no worries...
 	true
 else
 	# extract a list of device entries, then copy them to a writable fs