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fe6516b2e9
Add lockfile removal before exit in usbmount script per Jerry's recommendation. Also adjusted spacing! Read up on file locking a bit: - https://www.baeldung.com/linux/file-locking - https://linux.die.net/man/1/lockfile-create
235 lines
8.4 KiB
Bash
235 lines
8.4 KiB
Bash
#!/bin/sh
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# This script mounts USB mass storage devices when they are plugged in
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# and unmounts them when they are removed.
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# Copyright © 2004, 2005 Martin Dickopp
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# Copyright © 2008, 2009, 2010 Rogério Theodoro de Brito
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# Copyright © 2025, Jerry Vonau
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#
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# This file is free software; the copyright holder gives unlimited
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# permission to copy and/or distribute it, with or without
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# modifications, as long as this notice is preserved.
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#
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# This file is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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# PARTICULAR PURPOSE.
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# https://github.com/iiab/iiab/blob/master/roles/usb_lib/files/usbmount/copyright
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# https://github.com/rbrito/usbmount/blob/master/debian/copyright
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#set -e
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exec > /dev/null 2>&1
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######################################################################
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# Auxiliary functions
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# Log a string via the syslog facility.
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log()
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{
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if [ $1 != debug ] || expr "$VERBOSE" : "[yY]" > /dev/null; then
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logger -p user.$1 -t "usbmount[$$]" -- "$2"
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fi
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}
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# Test if the first parameter is in the list given by the second
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# parameter.
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in_list()
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{
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for v in $2; do
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[ "$1" != "$v" ] || return 0
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done
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return 1
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}
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######################################################################
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# Main program
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# Default values for configuration variables.
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ENABLED=1
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MOUNTPOINTS=
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FILESYSTEMS=
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MOUNTOPTIONS=
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FS_MOUNTOPTIONS=
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VERBOSE=no
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if [ -r /etc/usbmount/usbmount.conf ]; then
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. /etc/usbmount/usbmount.conf
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log debug "loaded usbmount configurations"
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fi
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if [ "${ENABLED:-1}" -eq 0 ]; then
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log info "usbmount is disabled, see /etc/usbmount/usbmount.conf"
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exit 0
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fi
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if [ ! -x /sbin/blkid ]; then
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log err "cannot execute /sbin/blkid"
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exit 1
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fi
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if [ "$1" = add ]; then
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# Per Policy 9.3.2, directories under /var/run have to be created
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# after every reboot.
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if [ ! -e /var/run/usbmount ]; then
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mkdir -p /var/run/usbmount
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log debug "creating /var/run/usbmount directory"
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else
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log debug "/var/run/usbmount exists"
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fi
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umask 022
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# Acquire lock.
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log debug "trying to acquire lock /var/run/usbmount/.mount.lock"
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lockfile-create --retry 6 /var/run/usbmount/.mount || \
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{ log err "cannot acquire lock /var/run/usbmount/.mount.lock"; exit 1; }
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trap '( lockfile-remove /var/run/usbmount/.mount )' 0
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log debug "acquired lock /var/run/usbmount/.mount.lock"
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# Grab device information from device and "divide it"
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# FIXME: improvement: implement mounting by label (notice that labels
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# can contain spaces, which makes things a little bit less comfortable).
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DEVINFO=$(/sbin/blkid -p $DEVNAME)
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FSTYPE=$(echo "$DEVINFO" | sed 's/.*[[:blank:]]TYPE="\([^"]*\)".*/\1/g; s/[[:blank:]]*//g;')
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UUID=$(echo "$DEVINFO" | sed 's/.*[[:blank:]]UUID="\([^"]*\)".*/\1/g; s/[[:blank:]]*//g;')
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USAGE=$(echo "$DEVINFO" | sed 's/.*[[:blank:]]USAGE="\([^"]*\)".*/\1/g; s/[[:blank:]]*//g;')
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if ! echo $USAGE | egrep -q "(filesystem|disklabel)"; then
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log debug "/$DEVNAME does not contain a filesystem or disklabel"
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lockfile-remove /var/run/usbmount/.mount
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exit
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fi
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log debug "/$DEVNAME contains filesystem type $FSTYPE"
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BOOTFW_DEV=$(/usr/bin/findmnt -no source /boot/firmware)
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log debug "BOOTFW_DEV $BOOTFW_DEV"
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ROOT_DEV=$(/usr/bin/findmnt -no source /)
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log debug "ROOT_DEV $ROOT_DEV"
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BOOT_DEV=$(/usr/bin/findmnt -no source /boot)
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log debug "BOOT_DEV $BOOT_DEV"
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if [ $BOOTFW_DEV = /$DEVNAME ]; then
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log debug "skipping BOOTFS_DEV $BOOTFS_DEV mounted at /boot/firmware"
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lockfile-remove /var/run/usbmount/.mount
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exit
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elif [ $ROOT_DEV = /$DEVNAME ]; then
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log debug "skipping ROOT_DEV $ROOT_DEV mounted at /"
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lockfile-remove /var/run/usbmount/.mount
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exit
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elif [ $BOOT_DEV = /$DEVNAME ]; then
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log debug "skipping BOOT_DEV $BOOT_DEV mount as /boot"
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lockfile-remove /var/run/usbmount/.mount
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exit
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fi
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# Try to use specifications in /etc/fstab to skip.
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if egrep -q "^[[:blank:]]*$DEVNAME" /etc/fstab; then
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log debug "skipping /$DEVNAME exit"
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lockfile-remove /var/run/usbmount/.mount
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exit
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elif grep -q "^[[:blank:]]*UUID=$UUID" /etc/fstab; then
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log debug "skipping $UUID"
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lockfile-remove /var/run/usbmount/.mount
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exit
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else
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log debug "/$DEVNAME contains filesystem type $FSTYPE"
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fstype=$FSTYPE
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# Test if the filesystem type is in the list of filesystem
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# types to mount.
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if in_list "$fstype" "$FILESYSTEMS"; then
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# Search an available mountpoint.
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for v in $MOUNTPOINTS; do
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if [ -d "$v" ] && ! grep -q "^[^ ][^ ]* *$v " /proc/mounts; then
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mountpoint="$v"
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log debug "mountpoint $mountpoint is available for /$DEVNAME"
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break
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fi
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done
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if [ -n "$mountpoint" ]; then
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# Determine mount options.
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options=
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for v in $FS_MOUNTOPTIONS; do
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if expr "$v" : "-fstype=$fstype,."; then
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options="$(echo "$v" | sed 's/^[^,]*,//')"
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break
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fi
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done
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if [ -n "$MOUNTOPTIONS" ]; then
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options="$MOUNTOPTIONS${options:+,$options}"
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fi
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# Mount the filesystem.
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log info "executing command: mount -t$fstype ${options:+-o$options} $DEVNAME $mountpoint"
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mount "-t$fstype" "${options:+-o$options}" "$DEVNAME" "$mountpoint"
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# Determine vendor and model.
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vendor=
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if [ -r "/sys$DEVPATH/device/vendor" ]; then
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vendor="`cat \"/sys$DEVPATH/device/vendor\"`"
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elif [ -r "/sys$DEVPATH/../device/vendor" ]; then
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vendor="`cat \"/sys$DEVPATH/../device/vendor\"`"
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elif [ -r "/sys$DEVPATH/device/../manufacturer" ]; then
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vendor="`cat \"/sys$DEVPATH/device/../manufacturer\"`"
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elif [ -r "/sys$DEVPATH/../device/../manufacturer" ]; then
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vendor="`cat \"/sys$DEVPATH/../device/../manufacturer\"`"
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fi
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vendor="$(echo "$vendor" | sed 's/^[[:blank:]]\+//; s/[[:blank:]]\+$//')"
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model=
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if [ -r "/sys$DEVPATH/device/model" ]; then
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model="`cat \"/sys$DEVPATH/device/model\"`"
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elif [ -r "/sys$DEVPATH/../device/model" ]; then
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model="`cat \"/sys$DEVPATH/../device/model\"`"
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elif [ -r "/sys$DEVPATH/device/../product" ]; then
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model="`cat \"/sys$DEVPATH/device/../product\"`"
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elif [ -r "/sys$DEVPATH/../device/../product" ]; then
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model="`cat \"/sys$DEVPATH/../device/../product\"`"
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fi
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model="$(echo "$model" | sed 's/^[[:blank:]]\+//; s/[[:blank:]]\+$//')"
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# Run hook scripts; ignore errors.
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export UM_DEVICE="$DEVNAME"
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export UM_MOUNTPOINT="$mountpoint"
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export UM_FILESYSTEM="$fstype"
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export UM_MOUNTOPTIONS="$options"
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export UM_VENDOR="$vendor"
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export UM_MODEL="$model"
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log info "executing command: run-parts /etc/usbmount/mount.d"
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run-parts /etc/usbmount/mount.d || :
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else
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# No suitable mount point found.
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log warning "no mountpoint found for $DEVNAME"
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exit 1
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fi
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fi
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fi
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elif [ "$1" = remove ]; then
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# A block or partition device has been removed.
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# Test if it is mounted.
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while read device mountpoint fstype remainder; do
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if [ "$DEVNAME" = "$device" ]; then
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# If the mountpoint and filesystem type are maintained by
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# this script, unmount the filesystem.
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if in_list "$mountpoint" "$MOUNTPOINTS" &&
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in_list "$fstype" "$FILESYSTEMS"; then
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log info "executing command: umount -l $mountpoint"
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umount -l "$mountpoint"
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# Run hook scripts; ignore errors.
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export UM_DEVICE="$DEVNAME"
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export UM_MOUNTPOINT="$mountpoint"
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export UM_FILESYSTEM="$fstype"
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log info "executing command: run-parts /etc/usbmount/umount.d"
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run-parts /etc/usbmount/umount.d || :
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fi
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break
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fi
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done < /proc/mounts
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else
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log err "unexpected: action '$1'"
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exit 1
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fi
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log debug "usbmount execution finished"
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