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Mike Fleetwood 24d9599f66 Enable online resizing of extended partitions (!23)
A forum user had a case where they wanted to grow their in use root,
ext4 file system.  GParted supports this, but the partition was a
logical partition inside an extended partition and GParted doesn't
support resizing an extended partition while any contained logical
partitions are busy.

Example layout:

    Partition              File System   Mount Point
    /dev/sdb1              ntfs
    /dev/sdb2     [busy]
        /dev/sdb5 [busy]   ext4          /
    unallocated            unallocated

So just allow extended partitions to be resized online when online
partition resizing is available via libparted.

NOTE:
The block device that the Linux kernel provides for an extended
partition just maps to the first 1 KiB of the extended partition where
the Extended Boot Record is stored, and does not include any of the
contained logical partitions.  Therefore no application can care that
the extended partition is resized while a logical partition is in use
because it can't use the extended partition block device to access any
data.

The on disk layout looks like this:

    # fdisk -l /dev/sdb

    Disk /dev/sdb: 8589 MB, 8589934592 bytes, 16777216 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk label type: dos
    Disk identifier: 0x0007650e

       Device Boot      Start         End      Blocks   Id  System
    /dev/sdb1            2048     1050623      524288    7  HPFS/NTFS/exFAT
    /dev/sdb2         1050624     2101247      525312    5  Extended
    /dev/sdb5         1052672     2101247      524288   83  Linux

    # parted /dev/sdb unit s print free
    Model: ATA VBOX HARDDISK (scsi)
    Disk /dev/sdb: 16777216s
    Sector size (logical/physical): 512B/512B
    Partition Table: msdos
    Disk Flags:

    Number  Start     End        Size       Type      File system  Flags
            63s       2047s      1985s                Free Space
     1      2048s     1050623s   1048576s   primary   ntfs
     2      1050624s  2101247s   1050624s   extended
     5      1052672s  2101247s   1048576s   logical   ext4
            2101248s  16777215s  14675968s            Free Space

The kernel's partition sizes from /sys/block/sdb/sdb${N}/{start,size}
shows extended partition 2 has a size of only 2 sectors:

    # for N in 1 2 5
    > do
    > echo -e "/dev/sdb${N}\tstart=`cat /sys/block/sdb/sdb${N}/start`\tsize=`cat /sys/block/sdb/sdb${N}/size`"
    > done
    /dev/sdb1       start=2048      size=1048576
    /dev/sdb2       start=1050624   size=2
    /dev/sdb5       start=1052672   size=1048576

The EBR read from the whole of extended partition 2 block device:

    # hexdump -C /dev/sdb2
    00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
    *
    000001b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 86  |................|
    000001c0  06 41 83 cb 09 82 00 08  00 00 00 00 10 00 00 00  |.A..............|
    000001d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
    *
    000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa  |..............U.|
    00000200  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
    *
    00000400

Closes !23 - Enable online resizing of extended partitions
2019-02-20 16:15:17 +00:00
compose Remove old .cvsignore files 2017-06-02 10:47:35 -06:00
data Increase minimum required gtkmm to 2.11.1 (#794253) 2018-03-26 10:16:45 -06:00
doc Update URLs in the remaining files to https://gparted.org (#796411) 2018-06-19 09:47:19 -06:00
help Update Swedish translation 2019-01-02 21:17:08 +00:00
include Change Gtk::ProgressBar appearance by providing custom CSS (#7) 2019-02-11 08:57:18 +00:00
lib Update to Google Test 1.8.1 2019-01-21 16:41:31 +00:00
m4 Update Autoconf macro AX_CXX_COMPILE_STDCXX_11 to latest serial 18 2018-08-01 19:03:01 +01:00
po prepare-for-gtk3: Prepare for removal of Gtk::Menu_Helpers::Element (#7) 2019-02-11 08:57:18 +00:00
src Enable online resizing of extended partitions (!23) 2019-02-20 16:15:17 +00:00
tests Remove custom main() from test_PipeCapture (!22) 2019-01-21 16:41:31 +00:00
.gitignore .gitignore: Do not track compile script 2018-11-12 21:50:42 +00:00
.gitlab-ci.yml port-to-gtk3: Switch to Gtkmm3 (#7) 2019-02-11 08:57:18 +00:00
AUTHORS Recognise contribution by Luca Bacci 2019-02-11 09:21:01 +00:00
COPYING Revert "Fixed FSF's address. Fixes #721565" 2014-01-31 14:39:20 +01:00
COPYING-DOCS Added COPYING-DOCS and removed help/C/legal.xml file. The GFDL license should be translated only once per language, and not for each and every project that uses the license. See GParted bug #550047 2008-09-01 17:01:14 +00:00
ChangeLog Correctly capitalise GNOME in the Manual and man page (#739805) 2014-12-20 10:02:55 -07:00
HACKING Add translatable files reminder to HACKING file 2016-12-02 10:06:09 -07:00
Makefile.am Only when configured, grant root access to the X11 display (#776437) 2017-09-01 10:14:20 -06:00
NEWS Update name typo in NEWS file 2018-12-17 20:06:41 +00:00
README port-to-gtk3: Switch to Gtkmm3 (#7) 2019-02-11 08:57:18 +00:00
autogen.sh Remove deprecated USE_GNOME2_MACROS from autogen.sh 2018-02-08 21:58:51 +00:00
configure.ac port-to-gtk3: Use Gdk::AppLaunchContext to launch yelp (#7) 2019-02-11 08:57:18 +00:00
gparted.appdata.xml.in Update GParted appdata file (#12) 2018-10-08 09:53:58 -06:00
gparted.desktop.in.in Now install gparted wrapper script into $prefix/bin (#776437) 2017-09-01 10:14:20 -06:00
gparted.doap Update bug links from Bugzilla to GitLab issues (!11) 2018-08-24 09:54:12 +01:00
gparted.in Remove support for obsolete devkit-disks automount inhibitor 2018-06-27 20:26:40 +00:00
logo.png Add logo.png for automatic GitLab/GitHub project avatar 2018-05-25 17:18:49 +01:00
org.gnome.gparted.policy.in.in Update URLs in the remaining files to https://gparted.org (#796411) 2018-06-19 09:47:19 -06:00
testbuild.sh Add testbuild.sh script (#699881) 2013-05-27 11:08:39 -06:00

README

GPARTED
=======
Gparted is the GNOME Partition Editor for creating, reorganizing, and
deleting disk partitions.

A hard disk is usually subdivided into one or more partitions.  These
partitions are normally not re-sizable (making one smaller and the
adjacent one larger.)  Gparted makes it possible for you to take a
hard disk and change the partition organization, while preserving the
partition contents.

More specifically, Gparted enables you to create, destroy, resize,
move, check, label, and copy partitions, and the file systems
contained within.  This is useful for creating space for new operating
systems, reorganizing disk usage, and mirroring one partition with
another (disk imaging).

Gparted can also be used with storage devices other than hard disks,
such as USB flash drives, and memory cards.

Visit https://gparted.org for more information.


LICENSING
---------
GParted is released under the General Public License version 2, or (at
your option) any later version.  (GPLv2+).  All files are released under
the GPLv2+ unless explicitly licensed otherwise.

The GParted Manual is released under the GNU Free Documentation License
version 1.2 or any later version.  (GFDLv1.2+).

Google Test C++ test framework is released under the 3-Clause BSD
License.  (BSD-3-Clause).

See these files for more details:
   COPYING      - GNU General Public License version 2
   COPYING-DOCS - GNU Free Documentation License version 1.2
   lib/gtest/LICENSE
                - 3-Clause BSD License


NEWS
----
Information about changes to this release, and past releases can be
found in the file:
   NEWS


INSTALL
-------
a. Pre-built Binary

   Many GNU/Linux distributions already provide a pre-built binary
   package for GParted.  Instructions on how to install GParted on
   some distributions is given below:

      Debian or Ubuntu
      ----------------
      sudo apt-get install gparted

      Fedora or CentOS/RHEL
      ---------------------
      su -
      yum install gparted

      OpenSUSE
      --------
      sudo zypper install gparted

b. Building from Source

   Briefly, build and install GParted into the default location of
   /usr/local using:
      ./configure
      make
      sudo make install
      sudo install -m 644 org.gnome.gparted.policy \
             /usr/share/polkit-1/actions/org.gnome.gparted.local.policy
   This assumes all the dependencies are already installed, builds the
   default configuration and polkit is being used as the graphical su
   program.

   The following dependencies are required to build GParted from source:
      g++
      e2fsprogs
      parted
      gnome-common
      gtkmm3
      gettext
      gnome-doc-utils     - required if help documentation is to be built

   On Debian or Ubuntu, these dependencies may be obtained by running
   one of the following commands:
     Either;
      sudo apt-get build-dep gparted
     Or;
      sudo apt-get install build-essential e2fsprogs uuid uuid-dev \
                           gnome-common libparted-dev libgtkmm-3.0-dev \
                           libdevmapper-dev gnome-doc-utils docbook-xml

   On Fedora, you will need to run (as root);
      yum install gtkmm30-devel parted-devel e2fsprogs-devel gettext \
                  'perl(XML::Parser)' desktop-file-utils libuuid-devel \
                  gnome-doc-utils docbook-dtds intltool gnome-common \
                  gcc-c++
      yum groupinstall 'Development Tools'

   On openSUSE, these dependencies may be obtained by running the
   following commands;
      sudo zypper install automake autoconf make gnome-common \
                          libuuid-devel parted-devel gtkmm3-devel \
                          gnome-doc-utils-devel docbook-xsl-stylesheets
      sudo zypper install -t pattern devel_c_c++

   Again, build GParted with the default configuration and install into
   the default location of /usr/local using:
      ./configure
      make
      sudo make install

   If you wish to build this package without the help documentation use
   the --disable-doc flag:
      E.g., ./configure --disable-doc

   Scrollkeeper is needed on GNOME/Gtk 2 desktops to update the OMF
   catalog files to allow yelp to display the GParted help manual.  On
   GNOME/Gtk 3 desktops scrollkeeper in not required.  Use can be
   explicitly disabled with the --disable-scrollkeeper flag:
      E.g., ./configure --disable-scrollkeeper
   Note that the configure script will automatically disable
   scrollkeeper if the scrollkeeper-update command is not found.

   If you wish to build this package to use native libparted /dev/mapper
   dmraid support use the --enable-libparted-dmraid flag:
      E.g., ./configure --enable-libparted-dmraid

   If you wish to build this package with online resize support then
   the following is required:
      a)  Linux kernel version 3.6 or higher.
      b)  Libparted with online resize support.  Either:
          i)  Libparted version 3.2 or later which includes online
              resize support as standard.  In this case GParted is
              automatically built with online resize support.
          ii) Online resize support back ported into an earlier version
              of libparted.  This is only known to be included in Debian
              and derived distributions with parted version 2.3-14 and
              higher.  In this case online resize support must be
              specifically enabled with the --enable-online-resize flag:
                E.g., ./configure --enable-online-resize

   If you wish to build GParted to allow it to use xhost to grant root
   access to the X11 server use the --enable-xhost-root flag.  This is
   required to allow GParted to display under Wayland.
      ./configure --enable-xhost-root

   Please note that more than one configure flag can be used:
      E.g., ./configure --disable-doc --enable-libparted-dmraid

   The INSTALL file contains further GNU installation instructions.

c. Installing polkit's Action File

   GParted needs to run as root therefore it needs a graphical switch
   user program to allow normal users to run it.  Most desktops now use
   polkit as their preferred authorisation mechanism.  Therefore
   ./configure looks for polkit's pkexec as the first choice with
   fallbacks in order being: gksudo, gksu, kdesudo and finally xdg-su.
   Also polkit reads action files only from directory
   /usr/share/polkit-1/actions.  Therefore it is likely that a polkit
   action file will need to be installed into this directory.

   To determine if polkit's pkexec program is being used as the
   graphical privilege escalation program examine the output from
   ./configure.  These lines report that pkexec is being used:

      checking for pkexec >= 0.102... 0.112 found

   Where as either of these lines of ./configure output report that
   pkexec is not being used because either it was too old a version or
   it was not found:

      checking for pkexec >= 0.102... 0.96 found

      checking for pkexec >= 0.102... not found

   When GParted is configured with prefix /usr (using command
   ./configure --prefix=/usr) then make install will automatically
   install the polkit action file into the correct directory and no
   further steps need to be taken.  This is typically the case for
   distribution builds of GParted.

   However when GParted is configured with the default prefix of
   /usr/local, or any prefix other than /usr, then the polkit action
   file has to be manually installed into the correct directory.  Also
   it should have a unique file name to avoid overwriting the action
   file from the distribution's package.  Install the polkit action file
   with a unique name including an extra ".local" in the name:

      sudo install -m 644 org.gnome.gparted.policy \
             /usr/share/polkit-1/actions/org.gnome.gparted.local.policy

d. Building using a Specific (lib)parted Version

   1) Download the parted version you wish to use (e.g., 3.2) from:

      http://ftp.gnu.org/gnu/parted/

   2) Build and install parted.

      Extract parted tarball, configure, make, and sudo make install.
      Note that by default this will install into /usr/local.

   3) Set environment variables to inform the GParted build system to
      use libparted from /usr/local:

        export CPPFLAGS=-I/usr/local/include
        export LDFLAGS=-L/usr/local/lib
        export LD_RUN_PATH=/usr/local/lib
        export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

   4) Build gparted using steps listed above in "Building from Source".

      Note that when you run ./configure you should see the specific
      version of parted listed in the check for libparted >= 1.7.1.

      You will also see the libparted version listed when running
      gparted from the command line.


DIRECTORIES
------------
compose  - contains String::ucompose() function

data     - contains desktop icons

doc      - contains manual page documentation

help     - contains GParted Manual and international translations

include  - contains source header files

lib/gtest
         - contains Google Test C++ test framework libraries

m4       - contains macro files

po       - contains international language translations

src      - contains C++ source code


DISTRIBUTION NOTES
------------------
GParted uses GNU libparted to detect and manipulate devices and
partition tables.  The blkid command is also required to detect those
file systems which libparted doesn't detect.  (The blkid command should
be considered a mandatory requirement).

GParted also queries and manipulates the file systems within those
devices and partitions.  When available, it uses each file system's
specific commands.  The following optional file system specific packages
provide this support:

   btrfs-progs / btrfs-tools
   e2fsprogs
   f2fs-tools
   dosfstools
   mtools          - required to read and write FAT16/32 volume labels
                     and UUIDs
   hfsutils
   hfsprogs
   jfsutils
   nilfs-utils
   ntfs-3g / ntfsprogs
   reiser4progs
   reiserfsprogs / reiserfs-utils / reiserfs
   udftools
   util-linux      - required to create and check MINIX file systems
   xfsprogs, xfsdump


For dmraid support, the following packages are required:

   dmsetup         - removes /dev/mapper entries
   dmraid          - lists dmraid devices and creates /dev/mapper
                     entries

For GNU/Linux distribution dmraid support, the following are required:
   - kernel built with Device Mapping and Mirroring built.  From
     menuconfig, it is under Device Drivers -> <something> (RAID & LVM).
   - dmraid drive arrays activated on boot (e.g., dmraid -ay).


For LVM2 Physical Volume support the following command is required:
   lvm             - LVM2 administration tool
And device-mapper support in the kernel.


For accurate detection and reporting of Linux Software RAID Arrays the
following command is required:

   mdadm           - SWRaid administration tool


For LUKS support the following commands are required:
   cryptsetup      - LUKS volume administration tool
   dmsetup         - Device-mapper administration tool


For attempt data rescue for lost partitions, the following package
is required:
   gpart           - guesses PC-type hard disk partitions


Several more commands are optionally used by GParted if found on the
system.  These commands include:

   blkid           - [mandatory requirement] used to detect file systems
                     libparted doesn't, read UUIDs and volume labels
   hdparm          - used to query disk device serial numbers
   udisks          - used to prevent automounting of file systems
   devkit-disks    - used to prevent automounting of file systems
   {filemanager}   - used in attempt data rescue to display discovered
                     file systems.  (e.g., nautilus, pcmanfm)
   hal-lock        - used to prevent automounting of file systems
   pkexec          - used to acquire root privileges in gparted shell
                     script wrapper, but only if available when gparted
                     source is configured
   gksudo          - alternatively used to acquire root privileges in
                     gparted shell script wrapper, second choice if
                     available when gparted source is configured
   gksu            - alternatively used to acquire root privileges in
                     gparted shell script wrapper, third choice if
                     available when gparted source is configured
   kdesudo         - alternatively used to acquire root privileges in
                     gparted shell script wrapper, fourth choice if
                     available when gparted source is configured
   xdg-su          - alternatively used to acquire root privileges in
                     gparted shell script wrapper, last choice if
                     available when gparted source is configured
   udevinfo        - used in dmraid to query udev name
   udevadm         - used in dmraid to query udev name
   yelp            - used to display help manual
   xhost           - used to grant root access to the X11 server, only
                     when configured to do so