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m4rv1n
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PostPosted: Sat Oct 26, 2013 2:56 pm    Post subject: uam.conf MP_PERMS Reply with quote

I use uam to auto mount my usb devices. It works quite well but I stuck with the configuration of the MP_PERMS value.

The aformentioned value is located in /etc/udev/uam.conf
Code:

# NOTE:
#   This is just a sourced bash script, so think what you put here.
#   If you'd like to use $ sign, you must enclose string in '' or escape it.
#   If you'd like to use some other variable, feel free to use it.
#   In booleans 1, 'y', 't', 'yes', 'true' and 'on' evaluate as true.

# Whether to log progress verbosely, or just print a plain summary at the end.

VERBOSE=0

# A trace file path if tracing should be enabled. Leave empty otherwise.
# (it might be a good idea to place this file in /run, to have R/W ASAP)

TRACE=

# Base path for all uam-created mountpoints.

MOUNTPOINT_BASE='/media'

# Permissions to set on created parent directories and mountpoints.

PARENT_PERMS=0755
MP_PERMS=0700

# GID and umask of mounted filesystems like VFAT or NTFS.
# Is used directly in MOUNT_OPTS configvar.

MOUNT_GROUP='plugdev'
MOUNT_UMASK=07
MOUNT_FMASK=0117 # -x

# Options to pass to mount (default -- will be used if no specific defined).

MOUNT_OPTS='noatime'

# Options to pass to mount with a specific filesystem. For known ids, see udev's
# ${ID_FS_TYPE}. The suffixes MUST be uppercase (unless you have bash with
# case-insensitive variable names).

MOUNT_OPTS_VFAT="umask=${MOUNT_UMASK},fmask=${MOUNT_FMASK},gid=${MOUNT_GROUP},${MOUNT_OPTS}"
MOUNT_OPTS_NTFS="${MOUNT_OPTS_VFAT}"

# You may also use MOUNT_OPTS_* to use a different fs type than one detected
# by mount, e.g.:

MOUNT_OPTS_NTFS_3G="${MOUNT_OPTS_VFAT} -t ntfs-3g"
# MOUNT_OPTS_NTFS_3G="${MOUNT_OPTS_VFAT},force -t ntfs-3g"

# Whether to try to remount fs R/O if umount fails.

UMOUNT_TRY_RO=1

# Whether to engage an lazy-umount if umount fails.

UMOUNT_TRY_LAZY=1

# Whether to remove created mountpoints after umount or mount failure.

REMOVE_MOUNTPOINTS=1

# Whether to search for and remove unused mountpoints when we receive umount
# request for non-mounted (already unmounted?) device.

CLEANUP_ALLOW=1

# How deep to search for unused mountpoints under ${MOUNTPOINT_BASE}.
# 0 means to look only directly under ${MOUNTPOINT_BASE}, 1 to look in its'
# subdirectories etc. If not set, we try to count slashes in
# ${MOUNTPOINT_TEMPLATES}.

# CLEANUP_MAXDEPTH=0

# Whether we should stay on the same filesystem when searching for unused
# mounpoints (to avoid reading through floppies, CDs etc.). If you use
# mountpoints on a different filesystem than ${MOUNTPOINT_BASE} and you want to
# cleanup them too, set this to false.

CLEANUP_XDEV=1

# Whether to search for and remove symlinks to removed mountpoints.

CLEANUP_SYMLINKS=1

# 'Array' of possible mountpoint name templates to use (uam will use first free).
# Can contain pathnames relative to ${MOUNTPOINT_BASE}. If you'd like to use
# absolute pathnames here, just set MOUNTPOINT_BASE=''.
#
# You can use any environment variable provided by udev, including:
#   ${ID_FS_TYPE}      for fs type (ext2, swap, vfat, etc.)
#   ${ID_FS_UUID_ENC}   for fs UUID (unique identifier)
#   ${ID_FS_LABEL_ENC}   for fs label (user-specified)
# Below will work only under real udev, not when launched manually:
#   ${ID_SERIAL}      for full serial of device (incl. vendor, model and inst)
#   ${ID_SERIAL_SHORT}   for actual serial of device
# You can also use the following additional uam-specific vars:
#   ${DEVBASENAME}      to get basename of the device (i.e. sda1)
#   ${PARTN}         partition number (i.e. 1)
#   ${SERIAL}         like ${ID_SERIAL}, but without the instance
# If you would like to lookup these for a specific device, please call:
#   /sbin/blkid -o udev /dev/sdXY
# or (with older udev):
#   /lib/udev/vol_id /dev/sdXY
#
# If your /bin/sh points to bash you might also use standard bash array below.
# Simply change the single quotes below to parentheses and everything should
# work fine. Please notice that due to the nature of processing array variables,
# real bash arrays need to be 'directly' interpolated by bash while
# pseudo-arrays have to be quoted to prevent variable interpolation.

MOUNTPOINT_TEMPLATES='
   "${ID_FS_LABEL_ENC}"                        # label
   "${ID_FS_LABEL_ENC:+${SERIAL}-${ID_FS_LABEL_ENC}}"   # serial-label (if -n label)
   "${SERIAL:+${SERIAL}-${PARTN}}"                  # serial-partition number
   "${DEVBASENAME}"                           # sdXY
'

# Templates used for mountpoint symlink creation, i.e. to get nice names. Can
# overlap with MOUNTPOINT_TEMPLATES - when overlapping mountpoint is used the
# symlink will be skipped.

#SYMLINK_TEMPLATES='
#   "by-id/${SERIAL}"
#'

# Enable or disable supplied default hooks.

# Wait for /media to become writable before starting to mount. This is required
# in order to mount correctly media already inserted on boot.
HOOK_WAIT_FOR_MEDIA=1

# Notice user about (u)mounts using libnotify. This requires the sw-notify-send
# hack: x11-misc/sw-notify-send or http://github.com/mgorny/tinynotify-send/
HOOK_SW_NOTIFY=1

# Store additional (${MOUNT_GROUP}-readable) cache for uam-pmount helper.
# Disabled when unset.
HOOK_PMOUNT_CACHE=
#HOOK_PMOUNT_CACHE=/run/uam.cache

# Filter out devices you don't want uam to handle. The function below should
# return true value when a particular device should not be mounted and false
# otherwise (which is equal to not declaring the func at all).
#
# The following example disables mounting partitions with one of the predefined
# UUIDs (these are VFAT-style UUIDs). Please notice that it is either necessary
# to use boolean operators or '&& return 0' to keep returned value clean.
#
# filter_devices() {
#   [ "${ID_FS_UUID}" = "1234-5678" ] || \
#   [ "${ID_FS_UUID}" = "ABCD-ABCD" ]
# }

# vim:syntax=sh


My intesion was to set MP_PERMS=0770 so that all members of the group 'plugdev' have full access to the mount point. But unfortunately I alway end up with the permissions 'drwxr-xr-x' no matter to which value MP_PERMS is set:
Code:

drwxr-xr-x  3 root root 4096 Oct 24 00:01 SAM-1
drwxr-xr-x  3 root root 4096 Oct 24 00:02 SAM-2


I also had a look to the uam-common.sh under /lib/udev/uam or https://bitbucket.org/mgorny/uam/src/83f96a87ab21296672813ae45ee7841db381f29f/src/uam-common.sh?at=master but I didn't found out why it should not work. Especially the mp_create() function do excatly what I would suppose.
Code:
# mp_create( <mountpoint-path> )
# Create the mountpoint if it doesn't exist yet.

mp_create() {
        local mp notefile
        mp=${1}
        notefile=${mp}/${MP_NOTEFN}

        # we need to call it instead of using 'mkdir -p' below
        # because we want parents to have another permissions
        mkdir_parents "${mp}"
        if [ ! -d "${MP}" ]; then
                debug "... trying to create ${mp}"
                mkdir -m "${MP_PERMS}" "${mp}"
                date -u "+%D %T ${$}" > "${notefile}"
        fi
}


Do you have a clue what the issue could be?
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eyoung100
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PostPosted: Mon Oct 28, 2013 10:17 pm    Post subject: Reply with quote

Code:
MP_PERMS
0 - Use set setuid, setgid, or sticky bit
7 - Full permission for owner (rwx = 4+2+1=7)
0 - Remove group permission (--- = 0+0+0=0)
0 - Remove world permission (--- = 0+0+0=0)


MP_PERMS inherits from
Code:
PARENT_PERMS
0 - Use set setuid, setgid, or sticky bit
7 - Full permission for owner (rwx = 4+2+1=7)
5 - Read/Execute for Group (rx = 4+0+1=5)
5 - Read/Execute for Others (rx = 4+0+1=5)


Code:
drwxr-xr-x  3 root root 4096 Oct 24 00:01 SAM-1
drwxr-xr-x  3 root root 4096 Oct 24 00:02 SAM-2
= 0755
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m4rv1n
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PostPosted: Thu Oct 31, 2013 4:39 pm    Post subject: Reply with quote

Thanks!

Based on your info I could set MP_PERMS and PARENT_PERMS to

Code:
PARENT_PERMS=0775
MP_PERMS=0700


or

Code:
PARENT_PERMS=0775
MP_PERMS=0775


But for both I still end up with
Code:
drwxr-xr-x  3 root root 4096 Oct 24 00:01 SAM-1
drwxr-xr-x  3 root root 4096 Oct 24 00:02 SAM-2


Which looks quite strange to me. It is probably worth to mention that both SAM-1 and SAM-2 are ext3 formated.

Do I have to consider some other features?
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eyoung100
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PostPosted: Thu Oct 31, 2013 4:48 pm    Post subject: Reply with quote

Did the mount directories exist before you installed uam :?:

Code:
# Permissions to set on created parent directories and mountpoints.


Created Parents mean the new permissions only happen if the directories didn't exist
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PostPosted: Thu Oct 31, 2013 6:16 pm    Post subject: Reply with quote

No, except the /media directory.

All the other directories going to be created by uam and get removed via uam-pumount.
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eyoung100
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PostPosted: Thu Oct 31, 2013 6:50 pm    Post subject: Reply with quote

That answers that:
If the parent directory /media was created before uam, UAM cannot monitor or set permisions as it did not create the directory
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PostPosted: Sat Nov 09, 2013 2:47 pm    Post subject: Reply with quote

Ok, thanks for the info.
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