Additional log format (dmsg & logcat)

[SylvainDe]

Is your feature request related to a problem? Please describe.

It looks like the 2 (public) log formats that I use the most are not recognized by lnav:

• dmesg ( https://en.wikipedia.org/wiki/Dmesg )

Example:

[    0.011400] ACPI: Reserving SSDT table memory at [mem 0x9bbc7000-0x9bbc719a]
[    0.084325] percpu: Embedded 61 pages/cpu s212992 r8192 d28672 u262144
[    0.227420] ftrace: allocated 196 pages with 3 groups

• logcat ( https://developer.android.com/tools/logcat )

Example:

12-31 00:00:01.979  1482  1482 I SELinux : SELinux: Loaded service_contexts from:
12-31 00:00:03.418  1611  1611 I apexd   : Found /system/apex/com.android.runtime.debug
12-31 00:00:04.190  1448  1448 D RefBase : RefBase: Explicit destruction, weak count = 0 (in 0xb5c2a144)
12-31 00:00:04.190  1448  1448 W RefBase : CallStack::getCurrentInternal not linked, returning null

(Note: other formats can be used such as the output as per https://developer.android.com/tools/logcat#outputFormat )

Describe the solution you'd like

I'd like to know if it is worth spending some time defining these properly (with https://docs.lnav.org/en/latest/formats.html#defining-a-new-format ) and submitting a PR for it.

In particular, may I suggest 2 formats for the same types of logs depending on the formatting used, for instance:

• "dmesg" vs "dmesg --raw"
• "logcat" vs "logcat -v long"

Also, in the case of "logcat", I may have extra lines such as:

--------- beginning of main
12-31 00:00:00.072  1481  1481 W auditd  : type=2000 audit(0.0:1): state=initialized audit_enabled=0 res=1

Do we have to handle them in a special way (so that they do not prevent the format to be recognized) ?

Thanks in advance

[SylvainDe]

Now, it looks like other tickets have been opened mentioning logcat:

• Feature Request: Trigger Tag #539
• :save-session fails to execute properly when executing from shell script #591

and dmesg:

• dmesg format #878

so maybe this is me not doing things correctly... To be investigated on my side.

[limouren]

@SylvainDe Currently lnav provides a logcat format in an extra expo which could be installed as described here: https://docs.lnav.org/en/latest/formats.html#installing-format-files

But the format doesn't match for me and eventually I settled on the one in this PR: #1286