Bug 5723 - Some strange characters in log when using journalctl to query the log
Summary: Some strange characters in log when using journalctl to query the log
Status: RESOLVED WONTFIX
Alias: None
Product: System Startup
Classification: Runtime
Component: system-startup (show other bugs)
Version: 1.6
Hardware: x86 Multiple
: Low normal
Target Milestone: 1.7
Assignee: Chen Qi
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Reported: 2014-01-14 08:14 UTC by Yi Zhao
Modified: 2014-11-11 02:05 UTC (History)
4 users (show)

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OS type for building Yocto: ---
Type of Regression: ---
Verified:
Documentation change: No (bug/feature does not impact docs)

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Description Yi Zhao 2014-01-14 08:14:37 UTC 
git rev: master/1b636173ca88e5ccca1992f9a12367a1189fa674

Steps:
1. Add the following lines in conf/local.conf
DISTRO_FEATURES_append = " systemd"
VIRTUAL-RUNTIME_init_manager = "systemd"
DISTRO_FEATURES_BACKFILL_CONSIDERED = "sysvinit"

2. bitbake core-image-sato

When using journalctl to query the log, there are some strange characters in the log:
#############################################
Jan 14 07:59:34 qemux86 kernel: ACPI: Local APIC address 0xfee00000
Jan 14 07:59:34 qemux86 kernel: [[1;39m0MB HIGHMEM available.[[0m
Jan 14 07:59:34 qemux86 kernel: [[1;39m255MB LOWMEM available.[[0m
Jan 14 07:59:34 qemux86 kernel:   mapped low ram: 0 - 0fffe000
Jan 14 07:59:34 qemux86 kernel:   low ram: 0 - 0fffe000
Jan 14 07:59:34 qemux86 kernel: BRK [0x01c15000, 0x01c15fff] PGTABLE
Jan 14 07:59:34 qemux86 kernel: [[1;39mZone ranges:[[0m
Jan 14 07:59:34 qemux86 kernel: [[1;39m  DMA      [mem 0x00001000-0x00ffffff][[0m
Jan 14 07:59:34 qemux86 kernel: [[1;39m  Normal   [mem 0x01000000-0x0fffdfff][[0m
Jan 14 07:59:34 qemux86 kernel: [[1;39m  HighMem  empty[[0m
Jan 14 07:59:34 qemux86 kernel: [[1;39mMovable zone start for each node[[0m
Jan 14 07:59:34 qemux86 kernel: [[1;39mEarly memory node ranges[[0m
Jan 14 07:59:34 qemux86 kernel: [[1;39m  node   0: [mem 0x00001000-0x0009efff][[0m
Jan 14 07:59:34 qemux86 kernel: [[1;39m  node   0: [mem 0x00100000-0x0fffdfff][[0m
Jan 14 07:59:34 qemux86 kernel: On node 0 totalpages: 65436
###############################################
Comment 1 Chen Qi 2014-01-17 02:10:38 UTC 
The `less' command from busybox doesn't interpret these characters.
Installing the less package into the image will solve this problem.

As journal is a key functionality of systemd, I think we'd better add the 'less' package to the RDEPENDS of systemd.

//Chen Qi
Comment 2 Richard Purdie 2014-02-10 12:53:02 UTC 
Adding less as a dependency of systemd is a bit of a hack.

I believe busybox implemented some better handling of this?

I'd really prefer to see:

a) busybox handling of the escape sequences handled (backport the patch?)
and/or
b) systemd learning not to use the sequences on things that aren't terminals
Comment 3 Chen Qi 2014-11-11 02:05:20 UTC 
It's not a big problem. '--no-pager' can almost always work.