A partition containing LUKS encryption can only be moved when closed and
the Device Mapper encryption mapping only exists to be resized when
open. As GParted can't yet open or close LUKS encryption these
restrictions have to be adhered to when composing operations. Also as
encrypted partitions are only being resized when open, additionally
libparted and the kernel have to both be capable of resizing a partition
while in use.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Ensure pre-condition of never being passed a Partition object containing
an open LUKS encryption mapping is met for copy operation related
methods.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Users will expect to see that copying of LUKS is available in the File
System Support dialog, even if technically what is implemented is
copying of the file system within an open encryption mapping. There is
no other reason to do this change as these two previous commits have
fully enabled copying of encrypted content:
Implement copy operation of encrypted file systems (#774814)
Preview copy operation of encrypted file systems (#774818)
Set LUKS .copy capability so that the dialog shows copying availability,
but then disallow copying of closed LUKS. (Checking for the capability
and performing copying the content of an open LUKS encryption mapping is
inherent in Win_GParted::set_valid_operations() and GParted_Core::copy()
in the way that they access the block device containing the file system,
whether encrypted or not).
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Implement the copy operation by making the copy code work with the
Partition object directly containing the file system, instead of the
enclosing PartitionLUKS object containing the LUKS encryption mapping.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Implement composing of the copy paste operation for encrypted file
systems.
Copying a closed LUKS partition would duplicate the LUKS header
containing the UUID, passphrase and master encryption key. From a
security point of view having additional copies of encrypted data with
the same master key is an extra risk, but it all depends on what is
going to happen with that copy. The Cryptsetup FAQ [1] talks about how
to make a backup at the file system level and block level, preferring
file system level with separate encryption if needed. It strongly
recommends separate encryption if the copy is removable or going
off-site [2]. Also in the case of cloning the data, cloning the LUKS
container is strongly discouraged [3].
Therefore copying of encrypted file systems will be implemented by
copying the file system inside an open LUKS encryption mapping and not
by copying a closed LUKS partition.
Also, while creating new LUKS encryption is not yet supported, copying
an encrypted file system into a new partition will not be permitted as
that will always decrypt the data. An encrypted file system will be
allowed to be copied into an existing plain partition, decrypting the
data, or into an existing open encrypted partition, keeping it
encrypted. Pasting over the top of a closed encrypted partition will
remove the LUKS encryption. (This is planned to be removed when
creating and removing LUKS encryption is implemented as part of full
LUKS read-write support).
Remember that when pasting into an existing partition the file system
must fit within the available space and that encryption has overhead
from the LUKS header. Therefore copying from a plain partition into a
partition of the same size with open an encryption mapping will not fit
for space reasons.
[1] The Cryptsetup FAQ, Backup and data Recovery section
https://gitlab.com/cryptsetup/cryptsetup/wikis/FrequentlyAskedQuestions
[2] 6.7 Does a backup compromise security?
"If you do network-backup or tape-backup, I strongly recommend to go the
filesystem backup path with independent encryption, as you typically
cannot reliably delete data in these scenarios, especially in a cloud
setting."
[3] 6.15 Can I clone a LUKS container?
"You can, but it breaks security, because the cloned container has the
same header and hence the same master key. You cannot change the master
key on a LUKS container, even if you change the passphrase(s), the
master key stays the same. That means whoever has access to one of the
clones can decrypt them all, completely bypassing the passphrases.
The right way to do this is to first luksFormat the target container,
then to clone the contents of the source container, with both containers
mapped, i.e. decrypted. You can clone the decrypted contents of a LUKS
container in binary mode, although you may run into secondary issues
with GUIDs in filesystems, partition tables, RAID-components and the
like. These are just the normal problems binary cloning causes.
Note that if you need to ship (e.g.) cloned LUKS containers with a
default passphrase, that is fine as long as each container was
individually created (and hence has its own master key). In this case,
changing the default passphrase will make it secure again."
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Ensure pre-condition of never being passed a Partition object containing
an open LUKS encryption mapping is met for format operation related
methods.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Formatting an existing encrypted partition will format the file system
within the encrypted mapping. Formatting over the top of a closed
encrypted partition will remove the encryption. (The latter is planned
to be prevented when creating and removing LUKS encryption is
implemented as part of full LUKS read-write support).
Composing the format operation inside an open LUKS encryption mapping
also has to account for the size of that mapping and construct a
PartitionLUKS object containing the new file system. Implementing the
operation itself is as simple as passing the Partition object directly
containing the file system, instead of the outer PartitionLUKS object.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Already have:
Utils::get_filesystem_string(FS_EXT2) -> "ext2"
virtual Partition::get_filesystem_string() -> "ext2"
virtual PartitionLUKS::get_filesystem_string() -> "[Encrypted] ext2"
Add these:
Utils::get_encrypted_string() -> "[Encrypted]"
Utils::get_filesystem_string(false, FS_EXT2) -> "ext2"
Utils::get_filesystem_string(true, FS_EXT2) -> "[Encrypted] ext2"
This is ready for use of Utils::get_filesystem_string(true, FS_EXT2)
when composing the preview of a format of an encrypted file system by
Win_GParted::activate_format().
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Adapts the swapon/swapoff, activate/deactivate Volume Group and mount/
unmount file system code to work with the Partition object directly
containing the file system.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Ensure pre-condition of never being passed a Partition object containing
an open LUKS encryption mapping is met for check operation related
methods.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Just update the code describing and implementing the check operation.
No need to update the code composing the operation in
Win_GParted::activate_check() as that is incredibly simple, just cloning
the Partition object and doesn't need changing.
Note that for encrypted file systems this does:
1) runs FSCK on the encrypted file system;
2) grows the file system to fill the encrypted mapping.
At this time it does not grow the encryption mapping to fill the
partition. That will be added after resize/move has been implemented.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Ensure pre-condition of never being passed a Partition object containing
an open LUKS encryption mapping is met for label file system operation
related methods.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Again, just need to change the code when composing, describing and
implementing the operation to query and set the Partition object
directly containing the file system, instead of the enclosing encryption
mapping to make it work.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Ensure pre-condition of never being passed a Partition object containing
an open LUKS encryption mapping is met for change UUID operation related
methods.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
When composing, describing and implementing the operation just need the
code to query and set the Partition object directly containing the file
system, instead of the enclosing encryption mapping to make it work.
The operation details for setting a new UUID on an encrypted ext4 file
system become:
Set a new random UUID on [Encrypted] ext4 file system on /dev/sdb4
+ calibrate /dev/sdb4
+ Set UUID on /dev/mapper/sdb4_crypt to a new, random value
+ tune2fs -U random /dev/mapper/sdb4_crypt
tune2fs 1.41.12 (17-May-2010)
Also note the now documented rule in apply_operation_to_disk() which
says each operation must leave the status of the encryption mapping and
file system as it found it.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
Provide and use a single interface for getting the file system string
for display, regardless of whether the partition is encrypted or the
encryption mapping is active or not.
Example return values for get_filesystem_string() for different types
and states of Partition objects:
1) Plain ext4 file system: -> "ext4"
2) Closed encrypted: -> "[Encrypted]"
3) Open encrypted ext4 file system: -> "[Encrypted] ext4"
This simplifies the code in TreeView_Detail::create_row() which sets the
file system type displayed in the main window. The same method will
then also be used when setting the operation description as each
operation is updated to handle encrypted file systems.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
The previous commit changed how the code behind the main window
retrieved the file system label for display. This is the relevant
changes in TreeView_Detail::create_row():
+ const Partition & filesystem_ptn = partition.get_filesystem_partition();
...
- Glib::ustring temp_filesystem_label = partition.get_filesystem_label();
+ Glib::ustring temp_filesystem_label = filesystem_ptn.get_filesystem_label();
treerow[treeview_detail_columns.label] = temp_filesystem_label;
In the case of an encrypted file system get_filesystem_label() is now
called on the Partition object directly rather than on the outer
Partition object containing the LUKS encryption.
The code behind the Information dialog always obtained and used the
Partition object directly containing the file system to call
get_filesystem_label() since read-only LUKS support was added.
Therefore the virtualised PartitionLUKS::get_filesystem_label() is no
longer needed, so remove it.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
There are multiple cases of code wanting to work with the Partition
object directly containing the file system, regardless of whether it is
within a PartitionLUKS object or not. The code had to do something
similar to this to access it:
const Partition * filesystem_ptn = &partition;
if ( partition.filesystem == FS_LUKS && partition.busy )
filesystem_ptn = &dynamic_cast<const PartitionLUKS *>( &partition )->get_encrypted();
...
// Access Partition object directly containing the file system
filesystem_ptn-> ...
Implement and use virtual accessor get_filesystem_partition() which
allows the code to be simplified like this:
const Partition & filesystem_ptn = partition.get_filesystem_partition();
...
// Access Partition object directly containing the file system
filesystem_ptn. ...
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
In the main window, display the busy status of the file system only
according to whether it is mounted or not, ignoring the status of the
encryption mapping.
Bug 774818 - Implement LUKS read-write actions NOT requiring a
passphrase
More recent versions of blkid don't report an ISO9660 file system on the
whole disk device if partitions can be reports for embedded partitions.
However when querying the whole disk device directly then the expected
ISO9660 file system is reported. For example on CentOS 7 with the
previous ISO images:
# wget http://git.kernel.org/cgit/utils/util-linux/util-linux.git/plain/tests/ts/isosize/sample.iso.gz
# dd if=/dev/zero bs=1M of=/dev/sdc
# zcat sample.iso.gz | dd of=/dev/sdc
# blkid -v
blkid from util-linux 2.23.2 (libblkid 2.23.0, 25-Apr-2013)
# blkid | fgrep /dev/sdc
/dev/sdc1: UUID="2013-01-04-22-05-45-00" LABEL="ARCH_201301" TYPE="iso9660" PTTYPE="dos"
# blkid /dev/sdc
/dev/sdc: UUID="2013-01-04-22-05-45-00" LABEL="ARCH_201301" TYPE="iso9660" PTTYPE="dos"
# wget http://cdimage.debian.org/debian-cd/8.6.0/amd64/iso-cd/debian-8.6.0-amd64-netinst.iso
# dd if=/dev/zero bs=1M of=/dev/sdc
# dd if=debian-8.6.0-amd64-netinst.iso bs=1M of=/dev/sdc
# blkid | fgrep /dev/sdc
/dev/sdc1: UUID="2016-09-17-14-23-48-00" LABEL="Debian 8.6.0 amd64 1" TYPE="iso9660" PTTYPE="dos"
/dev/sdc2: SEC_TYPE="msdos" UUID="17F3-1162" TYPE="vfat"
# blkid /dev/sdc
/dev/sdc: UUID="2016-09-17-14-23-48-00" LABEL="Debian 8.6.0 amd64 1" TYPE="iso9660" PTTYPE="dos"
This behavioural difference with blkid is probably as a result of newer
versions of udev informing the kernel of the partitions embedded within
the ISO9660 image, and not directly as a result of a change in blkid
itself. Older distributions don't have partition entries for the above
ISO images, but CentOS 7 (with udev 219) and later distributions do have
partition entries:
# fgrep sdc /proc/partitions
8 16 8388608 sdc
8 17 252928 sdc1
8 18 416 sdc2
Fix by ensuring that the blkid FS_Info cache has entries for whole disk
devices, even if each entry has all empty attributes because there is a
partition table and not a recognised file system.
Calling blkid on whole disk devices containing partition tables produces
output like this, with newer versions of blkid:
# blkid /dev/sda
/dev/sda: PTTYPE="dos"
# blkid /dev/sdb
/dev/sdb: PTTYPE="gpt"
This will be loaded into the FS_Info cache as a blank entry for the
device by run_blkid_load_cache(). There will be a path name but all the
other attributes will be blank because there are no TYPE, SEC_TYPE, UUID
or LABEL name value pairs. With older versions of blkid no output is
produced at all. In that case load_fs_info_cache_extra_for_path() will
create the same blank entry with just the path name defined.
Bug 771244 - gparted does not recognize the iso9660 file system in
cloned Ubuntu USB boot drives
ISO9660 images can contain embedded partitions which when encountered on
whole disk drives causes libparted to report various warnings and
errors. For example on CentOS 6 with upgraded libparted 2.4 the
following errors and warnings are encountered with various ISO images.
(Deliberately using an older distribution with older blkid to avoid
another issue with blkid addressed in the following patch).
Libparted error message 1:
# wget http://git.kernel.org/cgit/utils/util-linux/util-linux.git/plain/tests/ts/isosize/sample.iso.gz
# dd if=/dev/zero bs=1M of=/dev/sdc
# zcat sample.iso.gz | dd of=/dev/sdc
# blkid -v
blkid from util-linux-ng 2.17.2 (libblkid 2.17.0, 22-Mar-2010)
# blkid | fgrep /dev/sdc
/dev/sdc: LABEL="ARCH_201301" TYPE="iso9660"
# ./gpartedbin /dev/sdc
======================
libparted : 2.4
======================
Invalid partition table - recursive partition on /dev/sdc.
Libparted Error
(-) Invalid partition table - recursive partition on /dev/sdc.
[ Cancel ] [ Ignore ]
Libparted error message 2:
# wget http://cdimage.debian.org/debian-cd/8.6.0/amd64/iso-cd/debian-8.6.0-amd64-netinst.iso
# dd if=/dev/zero bs=1M of=/dev/sdc
# dd if=debian-8.6.0-amd64-netinst.iso bs=1M of=/dev/sdc
# blkid | fgrep /dev/sdc
/dev/sdc: LABEL="Debian 8.6.0 amd64 1" TYPE="iso9660"
# ./gpartedbin /dev/sdc
======================
libparted : 2.4
======================
/dev/sdc contains GPT signatures, indicating that it has a GPT
table. However, it does not have a valid fake msdos partition
table, as it should. Perhaps it was corrupted -- possibly by a
program that doesn't understand GPT partition tables. Or perhaps
you deleted the GPT table, and are now using an msdos partition
table. Is this a GPT partition table?
Libparted Warning
/!\ /dev/sdc contains GPT signatures, indicating that it has a GPT
table. However, it does not have a valid fake msdos partition
table, as it should. Perhaps it was corrupted -- possibly by a
program that doesn't understand GPT partition tables. Or
perhaps you deleted the GPT table, and are now using an msdos
partition table. Is this a GPT partition table?
[ Yes ] [ No ]
These messages are because GParted is calling ped_disk_new() to attempt
to read the partition table even before it has tried to recognise the
ISO9660 file system on the whole disk drive. Full call chain is:
set_devices_thread()
set_device_from_disk()
get_device_and_disk()
get_disk()
ped_disk_new()
Fix this by delaying the call to ped_disk_new() until after whole disk
drive recognition has been performed. Replace combined
get_device_and_disk() with separate get_device() and only call
get_disk() after no whole disk drive file system has been recognised.
This is similar to how calibrate_partition() and
erase_filesystem_signatures() are structured to also handle whole disk
drive file systems.
Bug 771244 - gparted does not recognize the iso9660 file system in
cloned Ubuntu USB boot drives
Move code from GParted_Core::set_devices_thread() performing top level
population of each Device object during the scan of the drives into new
set_device_from_disk() method.
Bug 771244 - gparted does not recognize the iso9660 file system in
cloned Ubuntu USB boot drives
Requires blkid.
Note that FS_LUKS was also moved to more closely match the order in
include/Utils.h
Bug 771244 - gparted does not recognize the iso9660 file system in
cloned Ubuntu USB boot drives
Glibc 2.25 is deprecating <sys/types.h> including <sys/sysmacros.h>.
https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=dbab6577c6684c62bd2521c1c29dc25c3cac966f
Deprecate inclusion of <sys/sysmacros.h> by <sys/types.h>
Building on Fedora Rawhide with Glibc 2.24.90 produces these warnings:
BlockSpecial.cc:64:13: warning: In the GNU C Library, "major" is defined
by <sys/sysmacros.h>. For historical compatibility, it is
currently defined by <sys/types.h> as well, but we plan to
remove this soon. To use "major", include <sys/sysmacros.h>
directly. If you did not intend to use a system-defined macro
"major", you should undefine it after including <sys/types.h>.
m_major = major( sb.st_rdev );
^~~~~~~~~~~~~~~~~~~~
BlockSpecial.cc:65:13: warning: In the GNU C Library, "minor" is defined
by <sys/sysmacros.h>. For historical compatibility, it is
currently defined by <sys/types.h> as well, but we plan to
remove this soon. To use "minor", include <sys/sysmacros.h>
directly. If you did not intend to use a system-defined macro
"minor", you should undefine it after including <sys/types.h>.
m_minor = minor( sb.st_rdev );
^~~~~~~~~~~~~~~~~~~~
Code needing major and minor macros should include <sys/sysmacros.h>
directly. As both Glibc and musl-libc have always provided this header
and GParted is a Linux only application, just always include the header
and don't bother with an autoconf check for its existence.
Bug 776173 - Missing sys/sysmacros.h #include, needed for experimental
glibc versions
The details for a file system shrink operation look like this with the
"shrink file system" message being missing:
Shrink /dev/sdb1 from 128.00 MiB to 100.00 MiB
+ calibrate /dev/sdb1
+ check file system on /dev/sdb1 for errors and (if possible) fix them
+ e2fsck -f -y -v -C 0 /dev/sdb1
+ resize2fs -p /dev/sdb1 102400K
+ shrink partition from 128.00 MiB to 100.00 MiB
This earlier commit [1] in the series dropped the message while moving
code from resize_filesystem() to shrink_filesystem(). Re-add the
message back.
[1] a0158abbeb
Refactor resizing file system apply methods (#775932)
Bug 775932 - Refactor mostly applying of operations
Explain when and why shrinking file systems is disallowed.
Unnecessary history. Check added in 2004-12-15:
d100935b55
:Set_Valid_Operations()
Comment later added in 2006-07-30:
677a21f50a
improved errorhandling a bit. At the initialscan we store errors/warnings
FileSystem::resize() (and derived) is only ever called from a single
location and always with the fill_partition argument supplied [1].
Therefore providing a default for the argument is unnecessary. So
remove it.
[1] Since these two commits from 2006-06-17, before GParted 0.3.0, which
added resize_filesystem() and maximize_filesystem() methods to wrap
calls to p_filesystem->resize() into a single location:
08245cd08c
cleanups in the core and the fs'es (resize)
2d7fb5700b
more cleanups in the core and the fs'es (these changelogs are getting
It made the code look a little messy, is easily resolved in the build
system and made the dependencies more complicated than needed. Each
GParted header was tracked via multiple different names (different
numbers of "../include/" prefixes). For example just looking at how
DialogFeatures.o depends on Utils.h:
$ cd src
$ make DialogFeatures.o
$ egrep ' [^ ]*Utils.h' .deps/DialogFeatures.Po
../include/DialogFeatures.h ../include/../include/Utils.h \
../include/../include/../include/../include/../include/../include/Utils.h \
../include/../include/../include/Utils.h \
After removing "../include/" from the GParted header #includes, just
need to add "-I../include" to the compile command via the AM_CPPFLAGS in
src/Makefile.am. Now the dependencies on GParted header files are
tracked under a single name (with a single "../include/" prefix). Now
DialogFeatures.o only depends on a single name to Utils.h:
$ make DialogFeatures.o
$ egrep ' [^ ]*Utils.h' .deps/DialogFeatures.Po
../include/DialogFeatures.h ../include/Utils.h ../include/i18n.h \
Simplify conditions checking whether activate/deactivate of an LVM2 PV
is possible. Excluding extended partition type was unnecessary as it
only matters that the file system type is LVM2 PV or not.
Also remove activate/deactivate from the comment above as that check
only determines if the busy state of file systems and swap space can be
toggled.
Linux-swap is recreated as part of copy, resize and move operations and
the code was special cased to implement that by calling the linux-swap
specific resize method. However the displayed text always said "growing
file system" and then proceeded to recreate linux swap. Example
operation:
Copy /dev/sdb1 to /dev/sdb2
...
+ copy file system from /dev/sdb1 to /dev/sdb2
Partition copy action skipped because linux-swap file system does not contain data
+ grow file system to fill the partition
+ create new linux-swap file system
+ mkswap -L"" -U "77d939ef-54d6-427a-a2bf-a053da7eed4c" /dev/sdb2
Setting up swapspace version 1, size = 262140 KiB
LABEL=, UUID=77d939ef-54d6-427a-a2bf-a053da7eed4c
Fix by writing recreate_linux_swap_filesystem() method with better
messaging and use everywhere maximise_filesystem() was previously used
to recreate linux-swap. Also as this is a create step, erase the
partition first to prevent the possibility of any other file system
signatures being found afterwards. Now the operation steps are more
reflective of what is actually being performed.
Copy /dev/sdb1 to /dev/sdb2
...
+ copy file system from /dev/sdb1 to /dev/sdb2
Partition copy action skipped because linux-swap file system does not contain data
+ clear old file system signatures in /dev/sdb2
+ create new linux-swap file system
+ mkswap -L"" -U "77d939ef-54d6-427a-a2bf-a053da7eed4c" /dev/sdb2
Setting up swapspace version 1, size = 262140 KiB
LABEL=, UUID=77d939ef-54d6-427a-a2bf-a053da7eed4c
Bug 775932 - Refactor mostly applying of operations
Resizing a file system only checked the .grow and .shrink support
capabilities of the file system, even when perform online resizing.
This wasn't a issue because .online_grow and .online_shrink were always
set from the offline .grow and .shrink capabilities respectively, but
only when online resizing was possible.
However the Device Mapper encryption mapping used for LUKS can only be
resized when online, and not when offline. Therefore the correct
.online_grow and .online_shrink capabilities needs to be checked to
prevent a LUKS resize step failing as not implemented.
Bug 775932 - Refactor mostly applying of operations
resize_filesystem() was meeting two different needs:
1) when called with fill_partition = false it generated operation
details;
2) when called from maximize_filesystem() with fill_partition = true it
skipped generating any operation details;
then ran the switch statement to select the resize implementation. So
extract the common switch statement into new method
resize_filesystem_implement().
Then observe that the only time resize_filesystem() was called to grow
the file system was when re-creating linux-swap. Therefore change that
call to use maximize_filesystem() and rename to shrink_filesystem() and
modify the operation detail messages to match.
Bug 775932 - Refactor mostly applying of operations
Attempting to copy or move linux-swap partition was possible when the
mkswap command was unavailable. However as linux-swap is re-created as
part of these operations the mkswap command is a mandatory requirement.
Example copy operation results:
Copy /dev/sdb1 to /dev/sdb2
+ calibrate /dev/sdb1
+ check file system on /dev/sdb1 for errors and (if possible) fix them
+ create empty partition
+ set partition type on /dev/sdb2
+ copy file system from /dev/sdb1 to /dev/sdb2 [SUCCESS]
Partition copy action skipped because linux-swap file system does not contain data
+ grow file system to fill the partition [WARNING]
growing is not available for this file system
Because mkswap was not available the grow action didn't re-create
the linux-swap so the newly copied partition is left without any content
and therefore reported as an unknown partition.
Fix by making copying and moving linux-swap depend on mkswap being
available.
Bug 775932 - Refactor mostly applying of operations
Make the methods called below apply_operation_to_disk() follow a
standard naming convention:
* Contains "_partition"
Uses libparted to query or change the partition in the disk label
(partition table).
E.g.:
calibrate_partition()
create_partition()
delete_partition()
name_partition()
resize_move_partition()
set_partition_type()
* Contains "_filesystem"
Manipulates the file system within the partition, mostly using the
FileSystem and derived class methods.
E.g.:
create_filesystem()
remove_filesystem()
label_filesystem()
copy_filesystem()
erase_filesystem_signatures()
check_repair_filesystem()
resize_filesystem()
maximize_filesystem()
* Other
Compound method calling multiple partition and file system related
apply methods.
E.g.:
create()
format()
copy()
resize_move()
resize()
move()
Rename:
Delete() -> delete_partition()
change_uuid() -> change_filesystem_uuid()
Bug 775932 - Refactor mostly applying of operations
The initial check in each of GParted_Core::resize() and move() check for
impossible conditions. (See resize_move() where both functions are
called for confirmation). The old messages could have suggested the
user somehow composed the operation incorrectly if they had ever been
seen.
Make it clear these failures are programming bugs, thus expecting the
user to raise a bug report should they ever be seen. While for now the
checks are obviously impossible they document preconditions for the
functions. More precondition checks are expected to be added later.
Bug 775932 - Refactor mostly applying of operations
Simplify the move() function. Change it into an if-operation-fails-
return-false style and re-write the final overly complicated conditional
check repair and maximise file system.
The final condition said if the file system was linux-swap or the new
partition was larger, perform a check repair and maximize file system.
However this is a move only step with a check at the top of the move()
function ensuring the Partition objects are the same size. So that
simplifies to only checking for linux-swap. As the context is a move
and linux-swap is recreated, performing a check repair first is
unnecessary, so remove that too.
Bug 775932 - Refactor mostly applying of operations
Make the logic at the resize_move_partition() call sites a little
simpler by not having to avoid calling it for whole disk device
partitions. Make it a successful non-operation in that case.
Bug 775932 - Refactor mostly applying of operations
Make the logic at the check_repair_filesystem() call sites a little
easier by not having to avoid calling it for online file systems. The
function handles that itself as a silent non-operation.
Bug 775932 - Refactor mostly applying of operations
Make the logic at the set_partition_type() call sites a little simpler
by not having to avoid calling it for whole disk device Partition
objects. Make set_partition_type() handle those itself as a silent
non-operation.
This is similar to how calibrate_partition() could be called on an
UNALLOCATED Partition object, and update_bootsector() is called on
non-NTFS file system Partition objects. Both are successful and silent
non-operations.
Bug 775932 - Refactor mostly applying of operations
Until now an encryption mapping has been modelled as a Partition object
similar to a partition like this:
.encrypted.device_path = "/dev/sdb1"
.encrypted.path = "/dev/mapper/sdb1_crypt"
.encrypted.whole_device = false
.encrypted.sector_start = // start of the mapping in the partition
.encrypted.sector_end = // end of the mapping in the partition
However accessing device_path in the start to end sector range is not
equivalent to accessing the partition path as it doesn't provide access
to the encrypted data. Therefore existing functions which read and
write partition data (GParted file system copying and signature erasure)
via libparted using the device_path won't work and will in fact destroy
the encrypted data. This could be coded around with an extra case in
the device opening code, however it is not necessary.
An encrypted block special device /dev/mapper/CRYPTNAME looks just like
a whole disk device because it doesn't contain a partition and the file
system it contains starts at sector 0 and goes to the end. Therefore
model an encryption mapping in the same way a whole disk device is
modelled as a Partition object like this:
.encrypted.device_path = "/dev/mapper/sdb1_crypt"
.encrypted.path = "/dev/mapper/sdb1_crypt"
.encrypted.whole_device = true
.encrypted.sector_start = 0
.encrypted.sector_end = // size of the encryption mapping - 1
Now GParted file system copy and erasure will just work without any
change. Just need to additionally store the LUKS header size, which was
previous stored in the sector_start, for use in the
get_sectors_{used,unused,unallocated}() calculations.
Bug 775932 - Refactor mostly applying of operations
