On systemd, SIGPIPE is ignored by default; see man 5 systemd.exec for
IgnoreSIGPIPE=. As a result, lsinitrd.sh under a systemd service
outputs "cat: write error: Broken pipe" in the processing of
determining a compression format of a given initramfs file using cat
command in the write part of a pipeline processing.
For example, this is a log message of kdump.service in RHEL7.1,
-- Logs begin at Wed 2015-11-04 09:57:33 JST, end at Wed 2015-11-04 09:58:28 JST. --
Nov 04 09:57:33 localhost systemd[1]: Stopping Crash recovery kernel arming...
Nov 04 09:57:33 localhost kdumpctl[22545]: kexec: unloaded kdump kernel
Nov 04 09:57:33 localhost kdumpctl[22545]: Stopping kdump: [OK]
Nov 04 09:57:33 localhost systemd[1]: Starting Crash recovery kernel arming...
Nov 04 09:57:36 localhost kdumpctl[22553]: Detected change(s) in the following file(s):
Nov 04 09:57:36 localhost kdumpctl[22553]: /etc/kdump.conf
Nov 04 09:57:36 localhost kdumpctl[22553]: Rebuilding /boot/initramfs-3.10.0-229.el7.x86_64kdump.img
Nov 04 09:57:40 localhost dracut[24914]: Executing: /usr/sbin/dracut --hostonly --hostonly-cmdline -o "plymouth dash resume" -f /boot/initramfs-3.10.0-229.el7.x86_64kdump.img 3.10.0-229.el7.x86_64
...<cut>...
Nov 04 09:58:12 localhost dracut[24914]: *** Creating image file done ***
Nov 04 09:58:12 localhost dracut[24914]: Image: /boot/initramfs-3.10.0-229.el7.x86_64kdump.img: 18M
Nov 04 09:58:12 localhost kdumpctl[22553]: cat: write error: Broken pipe
Nov 04 09:58:12 localhost dracut[24914]: ========================================================================
Nov 04 09:58:12 localhost dracut[24914]: Version: dracut-033-240.el7
Nov 04 09:58:12 localhost dracut[24914]:
Nov 04 09:58:12 localhost dracut[24914]: Arguments: --hostonly --hostonly-cmdline -o 'plymouth dash resume' -f
Nov 04 09:58:13 localhost dracut[24914]:
Nov 04 09:58:13 localhost dracut[24914]: dracut modules:
Nov 04 09:58:13 localhost dracut[24914]: bash
kdump.service builds and loads an initramfs for kdump kernel using
kdumpctl command which uses dracut command and so lsinitrd command,
too.
Although there's no actual harm except for the error message, there
has been several inquiries from customers about this message so
far. We should suppress this message to reduce needless
communications.
To suppress the message, this commit cleans up the processing of
reading the first 6 bytes of a given initramfs file without cat
command.
This patch adds option "-m|--mod" to lsinitrd to list dracut
modules in the image because sometimes having an option to
only list the dracut modules in the image could be handy.
Sample output:
--------------
[hbathini@localhost dracut]$ sudo ./lsinitrd.sh initramfs-3.11.10-100.fc18.x86_64.img -m
Image: initramfs-3.11.10-100.fc18.x86_64.img: 33M
========================================================================
Version: dracut-029-1.fc18.2
dracut modules:
i18n
network
ifcfg
drm
plymouth
btrfs
crypt
dm
dmraid
kernel-modules
lvm
mdraid
cifs
iscsi
nfs
resume
rootfs-block
terminfo
udev-rules
biosdevname
systemd
usrmount
base
fs-lib
shutdown
========================================================================
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
lsinitrd (and hence dracut) currently fail to list the contents of any
LZO-compressed image, and merely spit out misleading xzcat errors.
I guess no-one actually uses them.
Running dracut in a chroot environment, which has /dev not correctly
setup will result in errors like:
/usr/bin/lsinitrd: line 164: /dev/fd/62: No such file or directory
cpio: Malformed number �5�OK��
cpio: Malformed number 5�OK��
cpio: Malformed number �OK��
This is because bash wants /dev/fd/<num> for constructs like:
foo < <$(bar)
Dracut claims to have LZ4 support, but trying to use it will result in an xzcat failure at the end due to missing CAT support.
The lz4 command chokes on '--', so abstract that out into the CAT select.
Something similar will need to be done for LZO.
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
if /boot/<machine-id> exists; then
use /boot/<machine-id>/<kernel-version>/initrd as the default image;
else fallback to /boot/initramfs-<kernel-version>.img
The F16 installation image is two concatenated cpio images:
[xz-compressed dracut initramfs][uncompressed cpio with /squashfs.img]
So to show the contents, use xz with the "--single-stream" option.
https://bugzilla.redhat.com/show_bug.cgi?id=742299
Harald Hoyer