When you call close on any block device, udev kicks off a rule which
runs blkid to reexamine the device. We need to wait for this rule to
finish running since it holds the device open and can cause other
operations to fail, notably BLKRRPART.
Since we implement the new api e2fsck, just change the
internal of e2fsck_f to use e2fsck now.
v1->v2: use optargs_bitmask
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
m: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Add a new api e2fsck with two options:
correct: same as '-p' option of e2fsck
forceall: same as '-y' option of e2fsck
Thanks for Rich's idea.
v1->v2: use optargs_bitmask
v2->v3: change the optargs_bitmask check
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Tweak the error message "e2fsck -f" and "e2fsck -fy".
Indicate the user to use the correct and/or forceall options.
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
v1->v2: fix a typo pointed by Matt
Optimizations by reducing the STREQ operations and do some
code cleanup.
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
RWMJ: Whitespace changes.
This also adds comprehensive tests for utimens on regular files,
directories (RHBZ#761451), named pipes (RHBZ#761460), symbolic links,
block and char devices.
Note that there is a small change in the (previously undefined)
semantics of this call: It now sets the time on a symbolic link
itself, not on what the symbolic link points to.
You don't need to open the file O_WRONLY in order to call futimens on
the file descriptor. Opening it O_WRONLY fails for directories.
Therefore open O_RDONLY instead.
RHEL5 shoult not support '-p', '-i' and '-o export' options.
But we just split it according to the '-p' option.
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Augeas 0.10 depends on libxml2, so this is now required in the
appliance (in fact, it was already present).
However this exposed two bugs:
(1) In libguestfs we use a home-brewed recipe for Augeas flags,
resulting in this error:
/usr/include/augeas.h:24:25: fatal error: libxml/tree.h: No such file or directory
(2) Augeas's own augeas.pc didn't include the libxml2 flags, so
it was broken. This requires a patch to Augeas 0.10, see:
https://www.redhat.com/archives/augeas-devel/2011-December/msg00008.html
Change to using pkg-config to detect Augeas. It is still an optional
library.
A NEW API blkid.
It can print the device attributes.
Use it after list-devices, we can list ower devices and the attributes
of each device.
Use it like:
blkid <device>
It's should be a usefull function.
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Just add the -f option to mkfs.xfs to make sure we can
make a xfs filesystem when the device already has a
filesystem on it.
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Since some modules (`getopt', for example) may copy files
into the build directory, `top_builddir/lib' is needed as well as
`top_srcdir/lib'. -- GNU Gnulib manual, section 2.2 Initial import
This API is used to stop a md device.
When we want to move a device to another md array, we should
stop the md device which contained this device first.
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
This change renames the following 2 apis:
* mdadm_create -> md_create
* mdadm_detail -> md_detail
This is more consistent with list_md_devices, and removes a reference to an
implementation detail from the api.
Previously we bound the 'tune2fs -l' command so that we could list out
the tunables of an ext2/3/4 filesystem. Also commands like
set_e2label and set_e2uuid used tune2fs.
This commit binds many of the tunables that can be set using tune2fs.
The coverage is not complete, but we can add more later because this
uses optional parameters so the call is extensible without breaking
ABI. The current change gives us enough for using libguestfs within
OpenStack.
In the libguestfs live case we need to be careful not to modify the
real /etc/lvm/lvm.conf file (when setting the filter rule).
When the daemon starts, make a complete copy of /etc/lvm in a
temporary directory, and adjust LVM_SYSTEM_DIR to point to the copy.
All changes are made in the temporary copy.
Although this doesn't matter for the ordinary (appliance) case, it
matters for the libguestfs live case. In that case it could cause the
guest to be exploited by a tmp/symlink attack.
When given an invalid debug command, libguestfs responds with the
error message:
libguestfs: error: debug: use 'debug help' to list the supported commands
However this command does not work, as debug requires two
arguments. This change updates the message to prompt the user to use
'debug help 0'.
The four new APIs:
guestfs_copy_device_to_device,
guestfs_copy_device_to_file,
guestfs_copy_file_to_device, and
guestfs_copy_file_to_file
let you copy from a source to a destination, between files and
devices, optionally allowing source and destination offsets and size
to be specified.
This converts a partition device name (eg. /dev/sda1) to a partition
number (eg. 1). This is useful in conjunction with the parted APIs
that mostly take a disk device + partnum.
This reverts commit 025dba7f80.
If build and source directories are the same, you get this error:
make[3]: Leaving directory `/home/rjones/d/libguestfs/generator'
make[2]: Circular guestfs_protocol.c <- guestfs_protocol.c dependency dropped.
make[2]: Circular guestfs_protocol.h <- guestfs_protocol.h dependency dropped.
rm -f guestfs_protocol.h
ln guestfs_protocol.h
ln: accessing `guestfs_protocol.h': No such file or directory
These APIs let you copy compressed files or devices out from the disk
image.
Compression is useful for large images which are mostly zeroes. We
cannot currently do sparseness detection, and compression gives us a
form of zero detection for free.
Example usage:
$ guestfish --ro -a /dev/vg_pin/F16x64 -i \
compress-out gzip /etc/passwd /tmp/passwd.gz
$ file -z /tmp/passwd.gz
/tmp/passwd.gz: ASCII text (gzip compressed data, was "passwd", from
Unix, last modified: Sun Aug 28 14:40:46 2011)
This also improves the documentation for this call, pointing out
several pitfalls in using it.
This unfortunately breaks existing callers that might use
guestfs_grub_install without checking for this new group.
There is another case where downloads of small files could fail if the
library side (writer) fails. In this case the library would send back
a cancellation, but it would be received after the daemon had finished
sending the whole file (because the file is small enough). The daemon
would reenter the main loop and immediately get an unexpected cancel
message, causing the daemon to die.
This commit also makes test-cancellation-download-librarycancels.sh
more robust. We use Monte-Carlo testing with a range of file sizes.
Small file sizes should trigger the error case.
This code modifies zero, zero-device, is-zero, is-zero-device.
zero and zero-device are modified so that if the blocks of the device
already contain zeroes, then we don't write zeroes. The reason for
this is to avoid unnecessarily making the underlying storage
non-sparse or (in the qcow2 case) growing it.
is-zero and is-zero-device are modified so that zero detection is
faster. This is a nice side effect of making the first change.
Since avoiding unnecessary zeroing involves reading the blocks before
writing them, whereas before we just blindly wrote, this can be
slower. As you can see from the tests below, in the case where the
disk is sparse, it actually turns out to be faster, because we avoid
allocating the underlying blocks.
However in the case where the disk is non-sparse and full of existing
data, it is much slower. There might be a case for an API flag to
adjust whether or not we perform the zero check. I did not add this
flag because it is unlikely that the caller would have enough
information to be able to set the flag correctly.
(Elapsed time in seconds)
Format Test case Before After
Raw Sparse 16.4 5.3
Preallocated zero 17.0 18.8
Preallocated random 16.0 41.3
Qcow2 preallocation=off 18.7 5.6
preallocation=metadata 17.4 5.8
The current code uses a fixed block size of 4K for reading and
writing. I also tried the same tests with a block size of 64K but it
didn't make any significant difference.
(Thanks to Federico Simoncelli for suggesting this change)
Combine the two Gnulib instances together.
Add checks from old daemon/configure.ac into configure.ac.
Fix daemon/Makefile.am so it is like a normal subdirectory
Makefile.am.
Because we are now using the replacement strerror_r function from
Gnulib (instead of the one from glibc directly), this requires a small
change to src/guestfs.c.
