#!/bin/sh
#     Name:  gparted
#  Purpose:  Perform appropriate startup of GParted executable gpartedbin.
#
#            The purpose of these startup methods is to prevent
#            devices from being automounted, and to ensure only one
#            instance of GParted is running.  File system problems can
#            occur if devices are mounted prior to the completion of
#            GParted's operations, or if multiple partition editing
#            tools are in use concurrently.
#
# Copyright (C) 2008, 2009, 2010, 2013, 2015 Curtis Gedak
#
#  This file is part of GParted.
#
#  GParted is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  GParted is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with GParted.  If not, see <http://www.gnu.org/licenses/>.
#

#
#  Only permit one instance of GParted to execute at a time
#
if test "z`ps -e | grep gpartedbin`" != "z"; then
	echo "The process gpartedbin is already running."
	echo "Only one gpartedbin process is permitted."
	exit 1
fi

#
#  Define base command for executing GParted
#
BASE_CMD="@sbindir@/gpartedbin $*"

#
#  For non-root users try to get authorisation to run GParted as root.
#
if test "x`id -u`" != "x0"; then
	#
	#  If there is no configured SU program run gpartedbin as
	#  non-root to display the graphical error about needing root
	#  privileges.
	#
	if test "x@gksuprog@" = "x"; then
		echo "Root privileges are required for running gparted."
		$BASE_CMD
		exit 1
	fi

	@gksuprog@ '@bindir@/gparted' "$@"
	exit $?
fi

#
#  Search PATH to determine if systemctl program can be found
#  and if appropriate daemon is running.
#
HAVE_SYSTEMCTL=no
for k in '' `echo "$PATH" | sed 's,:, ,g'`; do
	if test -x "$k/systemctl"; then
		if test "z`ps -e | grep systemd`" != "z"; then
			HAVE_SYSTEMCTL=yes
			break
		fi
	fi
done

#
#  Check if udisks2-inhibit exists in known location
#  and if appropriate daemon is running.
#
HAVE_UDISKS2_INHIBIT=no
if test -x "/usr/lib/udisks2/udisks2-inhibit"; then
	if test "z`ps -e | grep 'udisksd'`" != "z"; then
		HAVE_UDISKS2_INHIBIT=yes
	fi
fi

#
#  Search PATH to determine if udisks program can be found
#  and if appropriate daemon is running.
#
HAVE_UDISKS=no
for k in '' `echo "$PATH" | sed 's,:, ,g'`; do
	if test -x "$k/udisks"; then
		if test "z`ps -e | grep udisks-daemon`" != "z"; then
			HAVE_UDISKS=yes
			break
		fi
	fi
done

#
#  Search PATH to determine if devkit-disks program can be found
#  and if appropriate daemon is running.
#  On December 1, 2009, devkit-disks was named udisks.
#
HAVE_DEVKIT_DISKS=no
for k in '' `echo "$PATH" | sed 's,:, ,g'`; do
	if test -x "$k/devkit-disks"; then
		if test "z`ps -e | grep devkit-disks-da`" != "z"; then
			HAVE_DEVKIT_DISKS=yes
			break
		fi
	fi
done

#
#  Search PATH to determine if hal-lock program can be found
#  and if appropriate daemon is running.
#
HAVE_HAL_LOCK=no
for k in '' `echo "$PATH" | sed 's,:, ,g'`; do
	if test -x "$k/hal-lock"; then
		if test "z`ps -e | grep hald`" != "z"; then
			HAVE_HAL_LOCK=yes
			break
		fi
	fi
done

#
#  Use systemctl to prevent automount by masking currently unmasked mount points
#
if test "x$HAVE_SYSTEMCTL" = "xyes"; then
	MOUNTLIST=`systemctl list-units --full --all -t mount --no-legend \
	  | grep -v masked | cut -f1 -d' ' \
	  | egrep -v '^(dev-hugepages|dev-mqueue|proc-sys-fs-binfmt_misc|run-user-.*-gvfs|sys-fs-fuse-connections|sys-kernel-config|sys-kernel-debug)'`
	systemctl --runtime mask --quiet -- $MOUNTLIST
fi

#
# Create temporary blank overrides for all udev rules which automatically
# start Linux Software RAID array members.
#
# Udev stores volatile / temporary runtime rules in directory /run/udev/rules.d.
# Older versions use /dev/.udev/rules.d instead, and even older versions don't
# have such a directory at all.  Volatile / temporary rules are use to override
# default rules from /lib/udev/rules.d.  (Permanent local administrative rules
# in directory /etc/udev/rules.d override all others).  See udev(7) manual page
# from various versions of udev for details.
#
# Default udev rules containing mdadm to incrementally start array members are
# found in 64-md-raid.rules and/or 65-md-incremental.rules, depending on the
# distribution and age.  The rules may be commented out or not exist at all.
#
UDEV_TEMP_MDADM_RULES=''  # List of temporary override rules files.
for udev_temp_d in /run/udev /dev/.udev; do
	if test -d "$udev_temp_d"; then
		test ! -d "$udev_temp_d/rules.d" && mkdir "$udev_temp_d/rules.d"
		udev_mdadm_rules=`egrep -l '^[^#].*mdadm (-I|--incremental)' /lib/udev/rules.d/*.rules 2> /dev/null`
		UDEV_TEMP_MDADM_RULES=`echo "$udev_mdadm_rules" | sed 's,^/lib/udev,'"$udev_temp_d"','`
		break
	fi
done
for rule in $UDEV_TEMP_MDADM_RULES; do
	touch "$rule"
done

#
#  Use udisks2-inhibit if udisks2-inhibit exists and deamon running.
#  Else use both udisks and hal-lock for invocation if both binaries exist and both
#  daemons are running.
#  Else use udisks if binary exists and daemon is running.
#  Else use both devkit-disks and hal-lock for invocation if both binaries exist
#  and both of the daemons are running.
#  Else use devkit-disks if binary exists and daemon is running.
#  Otherwise use hal-lock for invocation if binary exists and daemon is running.
#  If the above checks fail then simply run gpartedbin.
#
if test "x$HAVE_UDISKS2_INHIBIT" = "xyes"; then
	/usr/lib/udisks2/udisks2-inhibit $BASE_CMD
elif test "x$HAVE_UDISKS" = "xyes" && test "x$HAVE_HAL_LOCK" = "xyes"; then
	udisks --inhibit -- \
		hal-lock --interface org.freedesktop.Hal.Device.Storage --exclusive \
			--run "$BASE_CMD"
elif test "x$HAVE_UDISKS" = "xyes"; then
	udisks --inhibit -- $BASE_CMD
elif test "x$HAVE_DEVKIT_DISKS" = "xyes" && test "x$HAVE_HAL_LOCK" = "xyes"; then
	devkit-disks --inhibit -- \
		hal-lock --interface org.freedesktop.Hal.Device.Storage --exclusive \
			--run "$BASE_CMD"
elif test "x$HAVE_DEVKIT_DISKS" = "xyes"; then
	devkit-disks --inhibit -- $BASE_CMD
elif test "x$HAVE_HAL_LOCK" = "xyes"; then
	hal-lock --interface org.freedesktop.Hal.Device.Storage --exclusive \
		--run "$BASE_CMD"
else
	$BASE_CMD
fi

#
# Clear any temporary override udev rules used to stop udev automatically
# starting Linux Software RAID array members.
#
for rule in $UDEV_TEMP_MDADM_RULES; do
	rm -f "$rule"
done

#
#  Use systemctl to restore that status of any mount points changed above
#
if test "x$HAVE_SYSTEMCTL" = "xyes"; then
	systemctl --runtime unmask --quiet -- $MOUNTLIST
fi