From a27a8077481f9c855ba8424bbbf368dec9f62f26 Mon Sep 17 00:00:00 2001 From: trasz Date: Thu, 21 May 2015 13:08:30 +0000 Subject: [PATCH] MFC r275681: Add "-media" autofs map, to access data on removable media, such as CD drives or flash keys. It can be enabled by uncommenting a single entry in default /etc/auto_master. It can also be easily modified to use fuse-based filesystems instead of in-kernel ones. There is still one deficiency - the mountpoints are permanent, they don't disappear when user removes the media. Fixing it needs some autofs changes. Relnotes: yes Sponsored by: The FreeBSD Foundation git-svn-id: svn://svn.freebsd.org/base/stable/10@283223 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- etc/auto_master | 3 ++ etc/autofs/Makefile | 2 +- etc/autofs/special_media | 93 +++++++++++++++++++++++++++++++++++ etc/devd.conf | 12 +++++ usr.sbin/autofs/auto_master.5 | 15 +++--- 5 files changed, 118 insertions(+), 7 deletions(-) create mode 100755 etc/autofs/special_media diff --git a/etc/auto_master b/etc/auto_master index 3b3e5dad7..2e4db21fe 100644 --- a/etc/auto_master +++ b/etc/auto_master @@ -3,3 +3,6 @@ # Automounter master map, see auto_master(5) for details. # /net -hosts -nobrowse,nosuid +# When using the -media special map, make sure to edit devd.conf(5) +# to move the call to "automount -c" out of the comments section. +#/media -media -nosuid diff --git a/etc/autofs/Makefile b/etc/autofs/Makefile index c9eda5073..3aa7e0307 100644 --- a/etc/autofs/Makefile +++ b/etc/autofs/Makefile @@ -1,6 +1,6 @@ # $FreeBSD$ -FILES= include_ldap special_hosts special_null +FILES= include_ldap special_hosts special_media special_null NO_OBJ= FILESDIR= /etc/autofs diff --git a/etc/autofs/special_media b/etc/autofs/special_media new file mode 100755 index 000000000..2a654b1d5 --- /dev/null +++ b/etc/autofs/special_media @@ -0,0 +1,93 @@ +#!/bin/sh +# +# $FreeBSD$ +# + +# Print newline-separated list of devices available for mounting. +# If there is a filesystem label - use it, otherwise use device name. +print_available() { + local _fstype _fstype_and_label _label _p + + for _p in ${providers}; do + _fstype_and_label="$(fstyp -l "/dev/${_p}" 2> /dev/null)" + if [ $? -ne 0 ]; then + # Ignore devices for which we were unable + # to determine filesystem type. + continue + fi + + _fstype="${_fstype_and_label%% *}" + if [ "${_fstype}" != "${_fstype_and_label}" ]; then + _label="${_fstype_and_label#* }" + echo "${_label}" + continue + fi + + echo "${_p}" + done +} + +# Print a single map entry. +print_one() { + local _fstype _fstype_and_label _label _key _p + + _key="$1" + + _fstype="$(fstyp "/dev/${_key}" 2> /dev/null)" + if [ $? -eq 0 ]; then + echo "-fstype=${_fstype},nosuid :/dev/${_key}" + return + fi + + for _p in ${providers}; do + _fstype_and_label="$(fstyp -l "/dev/${_p}" 2> /dev/null)" + if [ $? -ne 0 ]; then + # Ignore devices for which we were unable + # to determine filesystem type. + continue + fi + + _fstype="${_fstype_and_label%% *}" + if [ "${_fstype}" = "${_fstype_and_label}" ]; then + # No label, try another device. + continue + fi + + _label="${_fstype_and_label#* }" + if [ "${_label}" != "${_key}" ]; then + # Labels don't match, try another device. + continue + fi + + echo "-fstype=${_fstype},nosuid :/dev/${_p}" + done + + # No matching device - don't print anything, autofs will handle it. +} + +# Obtain a list of (geom-provider-name, access-count) pairs, turning this: +# +# z0xfffff80005085d00 [shape=hexagon,label="ada0\nr2w2e3\nerr#0\nsector=512\nstripe=0"]; +# +# Into this: +# +# ada0 r2w2e3 +# +# XXX: It would be easier to use kern.geom.conftxt instead, but it lacks +# access counts. +pairs=$(sysctl kern.geom.confdot | sed -n 's/^.*hexagon,label="\([^\]*\)\\n\([^\]*\).*/\1 \2/p') + +# Obtain a list of GEOM providers that are not already open - not mounted, +# and without other GEOM class, such as gpart, attached. In other words, +# grep for "r0w0e0". Skip providers with names containing slashes; we're +# not interested in geom_label(4) creations. +providers=$(echo "$pairs" | awk '$2 == "r0w0e0" && $1 !~ /\// { print $1 }') + +if [ $# -eq 0 ]; then + print_available + exit 0 +fi + +print_one "$1" +exit 0 + diff --git a/etc/devd.conf b/etc/devd.conf index 12f6931d4..742871768 100644 --- a/etc/devd.conf +++ b/etc/devd.conf @@ -318,4 +318,16 @@ notify 0 { action "/usr/local/etc/rc.d/postgresql restart"; }; +# Discard autofs caches, useful for the -media special map. The one +# second delay is for GEOM to finish tasting. +# +# XXX: We should probably have a devctl(4) event that fires after GEOM +# tasting. +# +notify 100 { + match "system" "DEVFS"; + match "cdev" "(da|mmcsd)[0-9]+"; + action "sleep 1 && /usr/sbin/automount -c"; +}; + */ diff --git a/usr.sbin/autofs/auto_master.5 b/usr.sbin/autofs/auto_master.5 index 8e817fe05..baad6407a 100644 --- a/usr.sbin/autofs/auto_master.5 +++ b/usr.sbin/autofs/auto_master.5 @@ -27,7 +27,7 @@ .\" .\" $FreeBSD$ .\" -.Dd November 21, 2014 +.Dd November 22, 2014 .Dt AUTO_MASTER 5 .Os .Sh NAME @@ -213,14 +213,17 @@ Supported special maps are: .Pp .Bl -tag -width "-hosts" -compact .It Li -hosts -This map queries the remote NFS server and maps exported volumes. -It is traditionally mounted on +Query the remote NFS server and map exported shares. +This map is traditionally mounted on .Pa /net . -It enables access to files on a remote NFS server by accessing +Access to files on a remote NFS server is provided through the .Pa /net/nfs-server-ip/share-name/ -directory, without the need for any further configuration. +directory without any additional configuration. +.It Li -media +Query devices that are not yet mounted, but contain valid filesystems. +Generally used to access files on removable media. .It Li -null -This map prevents the +Prevent .Xr automountd 8 from mounting anything on the mountpoint. .El -- 2.45.0