This help function can manipulate the crashkernel cmdline by adding an
number for each item. Also a basic test case for _crashkernel_add() is
provided in this patch.
Credit to Philipp, who contributes the original code.
Signed-off-by: Pingfan Liu <piliu@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
On aarch64, a 64k kernel's name looks like:
vmlinuz-5.14.0-300.el9.aarch64+64k and the corresponding debug kernel's
name looks like: vmlinuz-5.14.0-300.el9.aarch64+64k-debug, which ends
with the suffix -debug instead of +debug.
Fix the matching pattern by [+|-]debug
Signed-off-by: Pingfan Liu <piliu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
A Unified Kernel Image (UKI) is a single EFI PE executable combining an
EFI stub, a kernel image, an initrd image, and the kernel command line.
They are defined in the Boot Loader Specification [1] as type #2
entries. UKIs have the advantage that all code as well as meta data that
is required to boot the system, not only the kernel image, is combined
in a single PE file and can be signed for EFI SecureBoot. This extends
the coverage of SecureBoot extensively.
For RHEL support for UKI were included into kernel-ark with 16c7e3ee836e
("redhat: Add sub-RPM with a EFI unified kernel image for virtual
machines").
There are two problems with UKIs from the kdump point of view at the
moment. First, they cannot be directly loaded via kexec_file_load and
second, the initrd included isn't suitable for kdump. In order to enable
kdump on systems with UKIs build the kdump initrd as usual and extract
the kernel image before loading the crash kernel.
[1] https://uapi-group.org/specifications/specs/boot_loader_specification/
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Pingfan Liu <piliu@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
The function is only used in do_estimate. Move it to kdumpctl to
prevent confusion.
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Pingfan Liu <piliu@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
The function is only used in kdumpctl. Thus move it there to keep
kdump-lib small and simple.
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
The function isn't used anywhere. Thus remove it to keep kdump-lib small
and simple.
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
The function isn't used anywhere. Thus remove it to keep kdump-lib small
and simple.
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
With the NetworkManager rewrite this function in no longer used. This
also allows to remove a lot of dead code in kdump-lib.
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
A recently added unit test found that prepare_cmdline has several
problems. For example an empty remove list will remove all spaces or
when the cmdline contains a parameter with quoted values containing
spaces will only remove the beginning up to the first space. Furthermore
the old design requires lots of subshells and pipes.
This patch rewrites prepare_cmdline in a way that makes the unit test
happy and tries to use as many bash built-ins as possible.
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
Move the workaround for aws graviton cpus from load_kdump to
prepare_cmdline. This (1) makes the workaround available also for other
callers of prepare_cmdline (although not needed at the moment) and (2)
makes it easier to fix the problems found by the unit test included
earlier as all changes to the cmdline are done at one place now.
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
is_squash_available is only used in dracut-module-setup.sh and mkdumprd.
Neither of the two scripts calls prepare_kdump_bootinfo which determines
and sets KDUMP_KERNELVER. Thus KDUMP_KERNELVER is only non-zero if it
explicitly specified by the user in /etc/sysconfig/kdump (and the file
gets sourced, which is not the case for drachu-module-setup.sh).
In theory this can even lead to bugs. For example consider the case when
a debug kernel is running. In that case kdumpctl will try to use the
non-debug version of the kernel while is_squash_available will make its
decision based on the debug version. So in case the debug kernel has
squash available but the non-debug kernel doesn't mkdumprd will try to
add it nevertheless.
Thus factor out the kernel version detection from prepare_kdump_bootinfo
and make use of the new function when checking for the availability of
those kernel modules.
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
Both functions are almost identical. The only differences are (1) the
sysfs node the status is read from and (2) the fact the fadump version
doesn't verify if the file it's trying to read actually exists. Thus
merge the two functions and get rid of the check_current_status wrapper.
While at it rename the function to is_kernel_loaded which explains
better what the function does.
Finally, after moving FADUMP_REGISTER_SYS_NODE shellcheck can no longer
access the definition and starts complaining about it not being quoted.
Thus quote all uses of FADUMP_REGISTER_SYS_NODE.
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
We need to check if a directory or a device is lvm2 thinp target.
First, we use get_block_dump_target() to convert dump path into
block device, then we check if the device is lvm2 thinp target by
cmd lvs.
is_lvm2_thinp_device is now located in kdump-lib-initramfs.sh, for it
will be used in 2nd kernel. is_lvm2_thinp_dump_target is located in
kdump-lib.sh, for it is only used in 1st kernel, and it has dependencies
which exist in kdump-lib.sh.
Signed-off-by: Tao Liu <ltao@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Previously kexec-tools will pass "--compress zstd" to dracut. It
will make dracut to decide whether: a) call mksquashfs to make a
zstd format squash-root.img, b) call cmd zstd to make a initramfs.
Since dracut(>= 057) has decoupled the compressor for dracut and
dracut-squash, So in this patch, we will pass the compressor seperately.
Note:
The is_squash_available && !dracut_has_option --squash-compressor
&& !is_zsdt_command_available case is left unprocessed on purpose.
Actually, the situation when we want to call zstd compression is:
1) If squash function OK, we want dracut to invoke mksquashfs to make
a zstd format squash-root.img within initramfs.
2) If squash function is not OK, and cmd zstd presents, we want dracut
to invoke cmd zstd to make a zstd format initramfs.
is_zstd_command_available check can handle case 2 completely.
However, for the is_squash_available check, it cannot handle case 1
completely. It only checks if the kernel supports squashfs, it doesn't
check whether the squash module has been added by dracut when making
initramfs. In fact, in kexec-tools we are unable to do the check,
there are multiple ways to forbit dracut to load a module, such as
"dracut -o module" and "omit_dracutmodules in dracut.conf".
When squash dracut module is omitted, is_squash_available check will
still pass, so "--compress zstd" will be appended to dracut cmdline,
and it will call cmd zstd to do the compression. However cmd zstd may
not exist, so it fails.
The previous "--compress zstd" is ambiguous, after the intro of
"--squash-compressor", "--squash-compressor" only effect for
mksquashfs and "--compress" only effect for specific cmd.
So for the is_squash_available && !dracut_has_option
--squash-compressor && !is_zsdt_command_available case, we just leave
it to be handled the default way.
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Tao Liu <ltao@redhat.com>
This patch add virtiofs support for kexec-tools by introducing a new option
for /etc/kdump.conf:
virtiofs myfs
Where myfs is a variable tag name specified in qemu cmdline
"-device vhost-user-fs-pci,tag=myfs".
The patch covers the following cases:
1) Dumping VM's vmcore to a virtiofs shared directory;
2) When the VM's rootfs is a virtiofs shared directory and dumping the
VM's vmcore to its subdirectory, such as /var/crash;
3) The combination of case 1 & 2: The VM's rootfs is a virtiofs shared
directory and dumping the VM's vmcore to another virtiofs shared
directory.
Case 2 & 3 need dracut >= 057, otherwise VM cannot boot from virtiofs
shared rootfs. But it is not the issue of kexec-tools.
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Tao Liu <ltao@redhat.com>
Since commit c5bdd2d8f1 ("kdump-lib: use non-debug kernels first"),
non-debug kernel is preferred, over the debug variant, as dump capture
kernel to reduce memory consumption. This works alright for kdump as
the capture kernel is loaded using kexec.
In case of fadump, regular boot loader is used to load the capture
kernel. So, the default kernel needs to be used as capture kernel as
well. But with commit c5bdd2d8f1, initrd of a different kernel is
made dump capture capable, breaking fadump's ability to capture dump
properly. Fix this by sticking with the debug variant in case of
fadump.
Fixes: c5bdd2d8f1 ("kdump-lib: use non-debug kernels first")
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Acked-by: Lichen Liu <lichliu@redhat.com>
Acked-by: Coiby Xu <coxu@redhat.com>
The kernel of CoreOS is not in the standard locations, add
/boot/ostree/* to the boot_dirlist to find the vmlinuz.
Signed-off-by: Lichen Liu <lichliu@redhat.com>
Acked-by: Coiby Xu <coxu@redhat.com>
Currently $boot_img can get bad data if running on a platform
that doesn't set BOOT_IMAGE in the kernel command line. For
example, currently:
- s390x Fedora CoreOS machine:
```
[root@cosa-devsh ~]# sed "s/^BOOT_IMAGE=\((\S*)\)\?\(\S*\) .*/\2/" /proc/cmdline
mitigations=auto,nosmt ignition.platform.id=qemu ostree=/ostree/boot.0/fedora-coreos/2a72567ac8f7ed678c3ac89408f795e6ccd4e97b41e14af5f471b6a807e858b9/0 root=UUID=2a88436a-3b6b-4706-b33a-b8270bd87cde rw rootflags=prjquota boot=UUID=f4b2eaa5-9317-4798-85cf-308c477fee4c crashkernel=600M
```
where on a platform that uses GRUB we get:
- x86_64 Fedora CoreOS machine:
```
[root@cosa-devsh ~]# sed "s/^BOOT_IMAGE=\((\S*)\)\?\(\S*\) .*/\2/" /proc/cmdline
/ostree/fedora-coreos-af4f6cc7b9ff486cfa647680b180e989c72c8eed03a34a42e7328e49332bd20e/vmlinuz-5.18.5-200.fc36.x86_64
```
We should change the setting of the boot_img variable such that it will
be empty if BOOT_IMAGE doesn't exist.
With this change on the s390x machine:
```
[root@cosa-devsh ~]# grep -P -o '^BOOT_IMAGE=(\S+)' /proc/cmdline | sed "s/^BOOT_IMAGE=\((\S*)\)\?\(\S*\)/\2/"
[root@cosa-devsh ~]#
```
This change mattered much more before the change in c5bdd2d which changed
the following line from [[ -n $boot_img ]] to [[ "$boot_img" == *"$kdump_kernelver" ]].
Still I think this change has merit.
Signed-off-by: Dusty Mabe <dusty@dustymabe.com>
Acked-by: Coiby Xu <coxu@redhat.com>
There are many variants on OSTree based systems these days so
we should probably refer to the class of systems as "OSTree
based systems". Also, Atomic Host is dead.
Signed-off-by: Dusty Mabe <dusty@dustymabe.com>
Acked-by: Coiby Xu <coxu@redhat.com>
On RHEL9 and Fedora, the arm64 platform only supports 4KB page size.
the reserved memory size can be aligned to that on x86_64.
Introducing a new formula for 4KB on arm64, which bases on x86_64 plus
extra 64MB.
Signed-off-by: Pingfan Liu <piliu@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
Kdump uses currently running kernel as default, but when currently
running kernel is a debug kernel, it will consume more memory,
which may cause out-of-memory and fail to collect vmcore.
Now we will try to use non-debug kernels first if possible.
Also extract the logic of determine KDUMP_KERNEL from
prepare_kdump_bootinfo into a function. This function will return
KDUMP_KERNEL given a kernel version.
Signed-off-by: Lichen Liu <lichliu@redhat.com>
Acked-by: Coiby Xu <coxu@redhat.com>
This patch rewrites get_recommend_size to get rid of the following
limitations,
1. only supports ranges in crashkernel sorted in increasing order
2. the first entry of crashkernel should have only a single digit and
it's in gigabytes
Suggested-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Recently, it's found 'kdumpctl estimate' returns 512M while the system
reserves 1024M kdump memory in a case. This happens because the ranges
in /proc/iomem are inclusively. For example, "0-1: System RAM" means 2
bytes of system memory other than 1 byte. Fix this error by adding one
more byte.
Note
1. the function has been simplified as well.
2. define PROC_IOMEM as /proc/iomem for the sake of unit tests
Reported-by: Ruowen Qin <ruqin@redhat.com>
Fixes: 1813189 ("kdump-lib.sh: introduce functions to return recommened mem size")
Suggested-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Currently there are two issues with unit-testing the functions defined
in kdumpctl and other shell scripts after sourcing them,
- kdumpctl would call main which requires root permission and would
create single instance lock (/var/lock/kdump)
- kdumpctl and other shell scripts directly source files under /usr/lib/kdump/
When ShellSpec load a script via "Include", it defines the__SOURCED__
variable. By making use of __SOURCED__, we can
1. let kdumpctl not call main when kdumpctl is "Include"d by ShellSpec
2. instruct kdumpctl and kdump-lib.sh to source the files in the repo
when running ShelSpec tests
Note coverage/ is added to .gitignore because ShellSpec generates code
coverage results in this folder.
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
in prepare_kdump_bootinfo s/defaut/default/.
While at it declare it with the other local variables as local.
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Tao Liu <ltao@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
Previously the output of blkid is not checked. If the output
is empty, the eval will report the following error message:
/lib/kdump/kdump-lib.sh: eval: line 925: syntax error near unexpected token `;'
/lib/kdump/kdump-lib.sh: eval: line 925: `; echo $TYPE'
For example, we can observe such a failing when blkid is invoked
against a lvm thinpool block device:
$ blkid -u filesystem,crypto -o export -- "/dev/block/253\:2"
$ echo $?
2
$ udevadm info /dev/block/253\:2|grep S\:
S: mapper/vg00-thinpoll_tmeta
In this patch, we will use sed instead of eval, to output the
fstype of block device if any.
Signed-off-by: Tao Liu <ltao@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
shellcheck finds the following problem,
$ shellcheck kdump-lib.sh
In kdump-lib.sh line 876:
get_recommend_size "$sys_mem" "$ck_cmdline"
^---------^ SC2154: ck_cmdline is referenced but not assigned (did you mean '_ck_cmdline'?).
s/ck_cmdline/_ck_cmdline to fix kdump_get_arch_recommend_size.
Note s/sys_mem/_sys_mem as well to make the changes consistent.
Fixes: 105c016 ("factor out kdump_get_arch_recommend_crashkernel")
Signed-off-by: Coiby Xu <coxu@redhat.com>
Acked-by: Tao Liu <ltao@redhat.com>
This patch makes the default crashkernel value consistent with previous
one.
Fixes: 105c016 ("factor out kdump_get_arch_recommend_crashkernel")
Signed-off-by: Coiby Xu <coxu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
There is a mechanism to keep memory consumption minimum, i.e. equal
to trace_buf_size=1, until tracing by ftrace is actually started:
tracing: keep ring buffer to minimum size till used
73c5162aa3
Since ftrace is usually never used in the kdump 2nd kernel, the kdump
2nd kernel behaves in the same way with or without trace_buf_size=1.
So the issue which the patch want to solve never exists. Let's revert
the patch for better maintainance and avoid confusion.
ref link: https://bugzilla.redhat.com/show_bug.cgi?id=2034501#c20
This reverts commit f39000f.
Signed-off-by: Tao Liu <ltao@redhat.com>
Acked-by: Coiby Xu <coxu@redhat.com>
Since kdump-lib-initramfs.sh is included by kdump-lib.sh, and
FENCE_KDUMP_SEND is used by both 1st and 2nd kernel, moving
FENCE_KDUMP_SEND from kdump-lib.sh to kdump-lib-initramfs.sh.
Signed-off-by: Pingfan Liu <piliu@redhat.com>
Acked-by: Tao Liu <ltao@redhat.com>
This patch will make zstd as recommended instead of required for
kexec-tools. If zstd command/package is unavaliable, it can failback to invoke
gzip when making kdump initramfs.
Fixes: 0311f6e ("Set zstd as the default compression method for kdump initrd")
Signed-off-by: Tao Liu <ltao@redhat.com>
Acked-by: Coiby Xu <coxu@redhat.com>
The '|' in 'failure_action|default' should be replaced with '\|' when
passed to kdump_get_conf_val function. Because '|' needs to be escaped
to mean OR operation in sed regex, otherwise it will consider
'failure_action|default' as a whole string.
Fixes: ab1ef78 ("kdump-lib.sh: use kdump_get_conf_val to read config values")
v1 -> v2:
Rephased the commit message.
Replaced " with '.
Signed-off-by: Tao Liu <ltao@redhat.com>
Acked-by: Coiby Xu <coxu@redhat.com>
zstd has better compression ratio and time consumption balance.
When no customized compression method specified in kdump.conf,
we will use zstd as the default compression method.
**The test method:
I installed kexec-tools with and without the patch, executing the following
command for 4 times, and calculate the averange time:
$ rm -f /boot/initramfs-*kdump.img && time kdumpctl rebuild && \
ls -ail /boot/initramfs-*kdump.img
**The test result:
Bare metal x86_64 machine:
dracut with squash module
zlib lzo xz lz4 zstd
real 10.6282 11.0398 11.395 8.6424 10.1676
user 9.8932 11.9072 14.2304 2.8286 8.6468
sys 3.523 3.4626 3.6028 3.5 3.4942
size of
kdump.img 30575616 31419392 27102208 36666368 29236224
dracut without squash module
zlib lzo xz lz4 zstd
real 9.509 19.4876 11.6724 9.0338 10.267
user 10.6028 14.516 17.8662 4.0476 9.0936
sys 2.942 2.9184 3.0662 2.9232 3.0662
size of
kdump.img 19247949 19958120 14505056 21112544 17007764
PowerVM hosted ppc64le VM:
dracut with squash module | dracut without sqaush module
zlib zstd | zlib zstd
real 10.6742 10.7572 | 9.7676 10.5722
user 18.754 19.8338 | 20.7932 13.179
sys 1.8358 1.864 | 1.637 1.663
|
size of |
kdump.img 36917248 35467264 | 21441323 19007108
**discussion
zstd has a better compression ratio and time consumption balance.
v1 -> v2:
Use kdump_get_conf_val() to get dracut_args values of kdump.conf
v2 -> v3:
Attached testing benchmark
v3 -> v4:
Re-measured and re-attached the testing benchmark of x86_64 and ppc64le.
Changed regex '.*[[:space:]]' to '(^|[[:space:]])'
v4 -> v5:
Attacked lzo/xz/lz4 testing benchmark.
v5 -> v6:
Add zstd as required in kexec-tools.spec
Hello Coiby, you may use "RELEASE=34 make test-run", for
CONFIG_RD_ZSTD is enabled since fc-cloud-34
Acked-by: Coiby Xu <coxu@redhat.com>
Signed-off-by: Tao Liu <ltao@redhat.com>
Factor out kdump_get_arch_recommend_crashkernel to prepare for
kdump-anaconda-plugin for example to retrieve the default crashkernel
value.
Note the support of crashkenrel.default is dropped.
Reviewed-by: Pingfan Liu <piliu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
It has been decided to increase default crashkernel value to reduce the
possibility of OOM.
Fixes: 7b7ddab ("kdump-lib.sh: kdump_get_arch_recommend_size uses crashkernel.default")
Reviewed-by: Pingfan Liu <piliu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
This is a batch update done with:
shfmt -s -w kdump-lib.sh
Clean up code style and reduce code base size, no behaviour change.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Philipp Rudo <prudo@redhat.com>
Fix a few ambiguous syntax issues and remove some unused variables.
Also refactor some code to make it more robust.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Philipp Rudo <prudo@redhat.com>
Get rid of let, and remove useless '$' on arithmetic variables.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Philipp Rudo <prudo@redhat.com>
Replace echo "$(cmd)" and "var=$(cmd); echo $var" with just `cmd`.
And remove some useless cat.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Philipp Rudo <prudo@redhat.com>
This fixes word splitting issue with nmcli args. Current kexec-tools
scripts won't call nmcli with correct arguments when there are space in
network interface name.
nmcli expects multiple parameters, but get_nmcli_value_by_field only
accepts two params and depends on shell word splitting to split the
_nm_show_cmd into multiple params, which is very fragile.
So switch the param order, simplified this function and now multiple
params can be used properly.
And get_nmcli_connection_show_cmd_by_ifname returns multiple
nmcli params in a single variable, it depend on shell word splitting to
split the words when calling nmcli. But this is very fragile and break
easily when there are any special character in the connection path.
This function is only introduced to get and cache the nmcli command
which contains the "connection name".
Actually only cache the "connection path" is enough. Callers should
just call get_nmcli_connection_apath_by_ifname to cache the path, and
a new helper get_nmcli_field_by_conpath is introduced here to get value
from nmcli. This way "connection path" can contain any character.
Also get rid of another nmcli_cmd usage in
get_nmcli_connection_apath_by_ifname which stores multiple params in a
single bash variable separated by space.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Philipp Rudo <prudo@redhat.com>
Updated file syntax with following command:
sed -i -e 's/\(\s\)\[\s\([^]]*\)\s\]/\1\[\[\ \2 \]\]/g' kdump-lib.sh
(replace '[ ]' with '[[ ]]')
sed -i -e 's/`\([^`]*\)`/\$(\1)/g' kdump-lib.sh
(replace `...` with $(...))
And manually updated [[ ... -a ... ]] and [[ ... -o ... ]] with && and
||.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Philipp Rudo <prudo@redhat.com>
Move all functions needed in the second kernel from kdump-lib.sh
to kdump-lib-initramfs.sh, and update shebang headers.
Now, kdump-lib-initramfs.sh is an independent lib script, no longer
depend on kdump-lib.sh, and kdump-lib.sh is no longer needed for
the second kernel.
In later commits, functions in kdump-lib-initramfs.sh will be reworked
to be POSIX compatible, kdump-lib.sh will contain bash only functions.
POSIX shell have very limited features, eg. `local` keyword doesn't
exist in POSIX but we rely on that heavily. So kdump-lib.sh will
use bash syntax and contain the most complex helper and codes.
kdump-lib-initramfs.sh will contain the minimum set of helpers,
and be shared by both the first and second kernel.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Philipp Rudo <prudo@redhat.com>
Add a helper kdump_get_conf_val to replace get_option_value.
It can help cover more corner cases in the code, like when there are
multiple spaces in config file, config value separated by a tab,
heading spaces, or trailing comments.
And this uses "sed group command" and "sed hold buffer", make it much
faster than previous `grep <config> | tail -1`.
This helper is supposed to provide a universal way for kexec-tools
scripts to read in config value. Currently, different scripts are
reading the config in many different fragile ways.
For example, following codes are found in kexec-tools script code base:
1. grep ^force_rebuild $KDUMP_CONFIG_FILE
echo $_force_rebuild | cut -d' ' -f2
2. grep ^kdump_post $KDUMP_CONFIG_FILE | cut -d\ -f2
3. awk '/^sshkey/ {print $2}' $conf_file
4. grep ^path $KDUMP_CONFIG_FILE | cut -d' ' -f2-
1, 2, and 4 will fail if the space is replaced by, e.g. a tab
1 and 2 might fail if there are multiple spaces between config name
and config value:
"kdump_post /var/crash/scripts/kdump-post.sh"
A space will be read instead of config value.
1, 2, 3 will fail if there are space in file path, like:
"kdump_post /var/crash/scripts dir/kdump-post.sh"
4 will fail if there are trailing comments:
"path /var/crash # some comment here"
And all will fail if there are heading space,
" path /var/crash"
And all will most likely cause problems if the config file contains
the same option more than once.
And all of them are slower than the new sed call. Old get_option_value
is also very slow and doesn't handle heading space.
Although we never claim to support heading space or tailing comments
before, it's harmless to be more robust on config reading, and many
conf files in /etc support heading spaces. And have a faster and
safer config reading helper makes it easier to clean up the code.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Philipp Rudo <prudo@redhat.com>
Add a helper `kdump_read_conf` to replace read_strip_comments.
`kdump_read_conf` does a few more things:
- remove trailing spaces.
- format the content, remove duplicated spaces between name and value.
- read from KDUMP_CONFIG_FILE (/etc/kdump.conf) directly, avoid pasting
"/etc/kdump.conf" path everywhere in the code.
- check if config file exists, just in case.
Also unify the environmental variable, now KDUMP_CONFIG_FILE stands for
the default config location.
This helps avoid some shell pitfalls about spaces when reading config.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Philipp Rudo <prudo@redhat.com>
The new `crashkernel.default` file in kernel package can be used as the
ck_cmdline source.
Also keep the legacy code so old kernel packages will still work.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Pingfan Liu <piliu@redhat.com>
Now we need this helper again, for `reset-crashkernel`
This reverts commit ff46cfb19e.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
