382 lines
12 KiB
Bash
382 lines
12 KiB
Bash
#!/bin/sh
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#
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# Copyright (c) 1999 Matt Dillon
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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# On entry to this script the entire system consists of a read-only root
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# mounted via NFS. The kernel has run BOOTP and configured an interface
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# (otherwise it would not have been able to mount the NFS root!)
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#
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# We use the contents of /conf to create and populate memory filesystems
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# that are mounted on top of this root to implement the writable
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# (and host-specific) parts of the root filesystem, and other volatile
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# filesystems.
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#
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# The hierarchy in /conf has the form /conf/T/M/ where M are directories
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# for which memory filesystems will be created and filled,
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# and T is one of the "template" directories below:
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#
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# base universal base, typically a replica of the original root;
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# default secondary universal base, typically overriding some
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# of the files in the original root;
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# ${ipba} where ${ipba} is the assigned broadcast IP address
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# bcast/${ipba} same as above
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# ${class} where ${class} is a list of directories supplied by
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# bootp/dhcp through the T134 option.
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# ${ipba} and ${class} are typically used to configure features
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# for group of diskless clients, or even individual features;
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# ${ip} where ${ip} is the machine's assigned IP address, typically
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# used to set host-specific features;
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# ip/${ip} same as above
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#
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# Template directories are scanned in the order they are listed above,
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# with each successive directory overriding (merged into) the previous one;
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# non-existing directories are ignored. The subdirectory forms exist to
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# help keep the top level /conf manageable in large installations.
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#
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# The existence of a directory /conf/T/M causes this script to create a
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# memory filesystem mounted as /M on the client.
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#
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# Some files in /conf have special meaning, namely:
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#
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# Filename Action
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# ----------------------------------------------------------------
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# /conf/T/M/remount
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# The contents of the file is a mount command. E.g. if
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# /conf/1.2.3.4/foo/remount contains "mount -o ro /dev/ad0s3",
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# then /dev/ad0s3 will be be mounted on /conf/1.2.3.4/foo/
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#
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# /conf/T/M/remount_optional
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# If this file exists, then failure to execute the mount
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# command contained in /conf/T/M/remount is non-fatal.
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#
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# /conf/T/M/remount_subdir
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# If this file exists, then the behaviour of /conf/T/M/remount
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# changes as follows:
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# 1. /conf/T/M/remount is invoked to mount the root of the
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# filesystem where the configuration data exists on a
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# temporary mountpoint.
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# 2. /conf/T/M/remount_subdir is then invoked to mount a
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# *subdirectory* of the filesystem mounted by
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# /conf/T/M/remount on /conf/T/M/.
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#
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# /conf/T/M/diskless_remount
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# The contents of the file points to an NFS filesystem,
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# possibly followed by mount_nfs options. If the server name
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# is omitted, the script will prepend the root path used when
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# booting. E.g. if you booted from foo.com:/path/to/root,
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# an entry for /conf/base/etc/diskless_remount could be any of
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# foo.com:/path/to/root/etc
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# /etc -o ro
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# Because mount_nfs understands ".." in paths, it is
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# possible to mount from locations above the NFS root with
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# paths such as "/../../etc".
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#
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# /conf/T/M/md_size
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# The contents of the file specifies the size of the memory
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# filesystem to be created, in 512 byte blocks.
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# The default size is 10240 blocks (5MB). E.g. if
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# /conf/base/etc/md_size contains "30000" then a 15MB MFS
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# will be created. In case of multiple entries for the same
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# directory M, the last one in the scanning order is used.
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# NOTE: If you only need to create a memory filesystem but not
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# initialize it from a template, it is preferrable to specify
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# it in fstab e.g. as "md /tmp mfs -s=30m,rw 0 0"
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#
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# /conf/T/SUBDIR.cpio.gz
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# The file is cpio'd into /SUBDIR (and a memory filesystem is
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# created for /SUBDIR if necessary). The presence of this file
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# prevents the copy from /conf/T/SUBDIR/
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#
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# /conf/T/SUBDIR.remove
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# The list of paths contained in the file are rm -rf'd
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# relative to /SUBDIR.
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#
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# /conf/diskless_remount
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# Similar to /conf/T/M/diskless_remount above, but allows
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# all of /conf to be remounted. This can be used to allow
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# multiple roots to share the same /conf.
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#
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#
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# You will almost universally want to create the following files under /conf
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#
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# File Content
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# ---------------------------- ----------------------------------
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# /conf/base/etc/md_size size of /etc filesystem
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# /conf/base/etc/diskless_remount "/etc"
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# /conf/default/etc/rc.conf generic diskless config parameters
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# /conf/default/etc/fstab generic diskless fstab e.g. like this
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#
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# foo:/root_part / nfs ro 0 0
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# foo:/usr_part /usr nfs ro 0 0
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# foo:/home_part /home nfs rw 0 0
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# md /tmp mfs -s=30m,rw 0 0
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# md /var mfs -s=30m,rw 0 0
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# proc /proc procfs rw 0 0
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#
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# plus, possibly, overrides for password files etc.
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#
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# NOTE! /var, /tmp, and /dev will be typically created elsewhere, e.g.
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# as entries in the fstab as above.
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# Those filesystems should not be specified in /conf.
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#
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# (end of documentation, now get to the real code)
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dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null`
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# DEBUGGING
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# log something on stdout if verbose.
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o_verbose=0 # set to 1 or 2 if you want more debugging
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log() {
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[ ${o_verbose} -gt 0 ] && echo "*** $* ***"
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[ ${o_verbose} -gt 1 ] && read -p "=== Press enter to continue" foo
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}
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# chkerr:
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#
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# Routine to check for error
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#
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# checks error code and drops into shell on failure.
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# if shell exits, terminates script as well as /etc/rc.
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# if remount_optional exists under the mountpoint, skip this check.
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#
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chkerr() {
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lastitem () ( n=$(($# - 1)) ; shift $n ; echo $1 )
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mountpoint="$(lastitem $2)"
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[ -r $mountpoint/remount_optional ] && ( echo "$2 failed: ignoring due to remount_optional" ; return )
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case $1 in
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0)
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;;
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*)
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echo "$2 failed: dropping into /bin/sh"
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/bin/sh
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# RESUME
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;;
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esac
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}
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# The list of filesystems to umount after the copy
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to_umount=""
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handle_remount() { # $1 = mount point
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local nfspt mountopts b
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b=$1
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log handle_remount $1
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[ -d $b -a -f $b/diskless_remount ] || return
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read nfspt mountopts < $b/diskless_remount
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log "nfspt ${nfspt} mountopts ${mountopts}"
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# prepend the nfs root if not present
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[ `expr "$nfspt" : '\(.\)'` = "/" ] && nfspt="${nfsroot}${nfspt}"
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mount_nfs $mountopts $nfspt $b
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chkerr $? "mount_nfs $nfspt $b"
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to_umount="$b ${to_umount}"
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}
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# Create a generic memory disk
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#
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mount_md() {
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/sbin/mdmfs -S -i 4096 -s $1 -M md $2
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}
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# Create the memory filesystem if it has not already been created
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#
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create_md() {
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[ "x`eval echo \\$md_created_$1`" = "x" ] || return # only once
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if [ "x`eval echo \\$md_size_$1`" = "x" ]; then
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md_size=10240
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else
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md_size=`eval echo \\$md_size_$1`
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fi
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log create_md $1 with size $md_size
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mount_md $md_size /$1
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/bin/chmod 755 /$1
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eval md_created_$1=created
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}
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# DEBUGGING
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#
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# set -v
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# Figure out our interface and IP.
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#
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bootp_ifc=""
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bootp_ipa=""
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bootp_ipbca=""
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class=""
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if [ ${dlv:=0} -ne 0 ] ; then
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iflist=`ifconfig -l`
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for i in ${iflist} ; do
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set -- `ifconfig ${i}`
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while [ $# -ge 1 ] ; do
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if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then
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bootp_ifc=${i} ; bootp_ipa=${2} ; shift
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fi
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if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then
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bootp_ipbca=$2; shift
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fi
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shift
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done
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if [ "${bootp_ifc}" != "" ] ; then
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break
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fi
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done
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# Get the values passed with the T134 bootp cookie.
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class="`/sbin/sysctl -qn kern.bootp_cookie`"
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echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca} ${class}"
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fi
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log Figure out our NFS root path
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#
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set -- `mount -t nfs`
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while [ $# -ge 1 ] ; do
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if [ "$2" = "on" -a "$3" = "/" ]; then
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nfsroot="$1"
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break
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fi
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shift
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done
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# The list of directories with template files
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templates="base default"
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if [ -n "${bootp_ipbca}" ]; then
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templates="${templates} ${bootp_ipbca} bcast/${bootp_ipbca}"
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fi
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if [ -n "${class}" ]; then
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templates="${templates} ${class}"
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fi
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if [ -n "${bootp_ipa}" ]; then
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templates="${templates} ${bootp_ipa} ip/${bootp_ipa}"
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fi
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# If /conf/diskless_remount exists, remount all of /conf.
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handle_remount /conf
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# Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca},
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# and /conf/${bootp_ipa}. For each subdirectory found within these
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# directories:
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#
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# - calculate memory filesystem sizes. If the subdirectory (prior to
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# NFS remounting) contains the file 'md_size', the contents specified
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# in 512 byte sectors will be used to size the memory filesystem. Otherwise
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# 8192 sectors (4MB) is used.
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#
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# - handle NFS remounts. If the subdirectory contains the file
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# diskless_remount, the contents of the file is NFS mounted over
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# the directory. For example /conf/base/etc/diskless_remount
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# might contain 'myserver:/etc'. NFS remounts allow you to avoid
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# having to dup your system directories in /conf. Your server must
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# be sure to export those filesystems -alldirs, however.
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# If the diskless_remount file contains a string beginning with a
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# '/' it is assumed that the local nfsroot should be prepended to
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# it before attemping to the remount. This allows the root to be
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# relocated without needing to change the remount files.
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#
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log "templates are ${templates}"
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for i in ${templates} ; do
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for j in /conf/$i/* ; do
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[ -d $j ] || continue
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# memory filesystem size specification
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subdir=${j##*/}
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[ -f $j/md_size ] && eval md_size_$subdir=`cat $j/md_size`
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# remount. Beware, the command is in the file itself!
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if [ -f $j/remount ]; then
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if [ -f $j/remount_subdir ]; then
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k="/conf.tmp/$i/$subdir"
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[ -d $k ] || continue
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# Mount the filesystem root where the config data is
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# on the temporary mount point.
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nfspt=`/bin/cat $j/remount`
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$nfspt $k
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chkerr $? "$nfspt $k"
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# Now use a nullfs mount to get the data where we
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# really want to see it.
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remount_subdir=`/bin/cat $j/remount_subdir`
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remount_subdir_cmd="mount -t nullfs $k/$remount_subdir"
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$remount_subdir_cmd $j
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chkerr $? "$remount_subdir_cmd $j"
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# XXX check order -- we must force $k to be unmounted
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# after j, as j depends on k.
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to_umount="$j $k ${to_umount}"
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else
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nfspt=`/bin/cat $j/remount`
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$nfspt $j
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chkerr $? "$nfspt $j"
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to_umount="$j ${to_umount}" # XXX hope it is really a mount!
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fi
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fi
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# NFS remount
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handle_remount $j
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done
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done
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# - Create all required MFS filesystems and populate them from
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# our templates. Support both a direct template and a dir.cpio.gz
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# archive. Support dir.remove files containing a list of relative
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# paths to remove.
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#
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# The dir.cpio.gz form is there to make the copy process more efficient,
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# so if the cpio archive is present, it prevents the files from dir/
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# from being copied.
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for i in ${templates} ; do
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for j in /conf/$i/* ; do
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subdir=${j##*/}
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if [ -d $j -a ! -f $j.cpio.gz ]; then
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create_md $subdir
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cp -Rp $j/ /$subdir
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fi
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done
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for j in /conf/$i/*.cpio.gz ; do
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subdir=${j%*.cpio.gz}
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subdir=${subdir##*/}
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if [ -f $j ]; then
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create_md $subdir
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echo "Loading /$subdir from cpio archive $j"
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(cd / ; /rescue/tar -xpf $j)
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fi
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done
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for j in /conf/$i/*.remove ; do
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subdir=${j%*.remove}
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subdir=${subdir##*/}
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if [ -f $j ]; then
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# doubly sure it is a memory disk before rm -rf'ing
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create_md $subdir
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(cd /$subdir; rm -rf `/bin/cat $j`)
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fi
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done
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done
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# umount partitions used to fill the memory filesystems
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[ -n "${to_umount}" ] && umount $to_umount
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