uftrace tui in docker shows ~T~\ ~T~@(1) instead of pseudographics

[vt-alt]

uftrace tui in docker displays like this:

  TOTAL TIME : FUNCTION
   17.001  s : (1) apt-get
   19.261 us :   ~T~\ ~T~@(1) mkostemp
             :   ~T~B
    0.409 us :   ~T~\ ~T~@(1) getpid
             :   ~T~B
    0.316 us :   ~T~\ ~T~@(1) __snprintf_chk
             :   ~T~B
   41.176 us :   ~T~\ ~T~@(2) setenv
             :   ~T~B
    4.800 us :   ~T~\ ~T~@(12) signal
             :   ~T~B
   86.704 us :   ~T~\ ~T~@(1) fork
             :   ~T~B
   17.000  s :   ~T~\ ~T~@(1) waitpid
             :   ~T~B
             :   ~T~\ ~T~@(1) execvp
             :   ~T~B
    2.913 us :   ~T~\ ~T~@(1) fstat
             :   ~T~B
   20.147 us :   ~T~T ~T~@(1) unlink

TERM is xterm, terminfo is installed. There is no other TERM* env variables. It looked OK without docker. Maybe I'm missing something but I don't understand what.

Maybe there could be a option to force ascii or pseudographic lines?

[vt-alt]

ps. Btw, just a UI/UX thought: It would be easier to understand TUI navigation if q (or maybe arrow left) in G view would return to S view (i.e. to the first view when uftrace tui is started). It's not so intuitive that top view is a 'Session view' since it not marked in a TUI like this (only in man page, but not everybody study manpages extensively). Or maybe it should say instead:

S  Session view (this)

[vt-alt]

One more thought or maybe this is the TUI bug? Hard to tell since I never seen other behavior.

(Context) I want to analyze very huge trace (of apt-get install run with interaction between apt-get and librpm* libs [this is APT-RPM package manager)) so TUI in very important because there is extremely many calls.

So I want everything collapsed in Graph view (G) but when I press C it only collapses a single branch like c, not everything. 🤷

This is all in docker. Also (reversed selection cursor) line cross the window width to the next line sometimes (sometimes not) when scrolling. (Maybe this all related to the terminal mishandling.)

[namhyung]

Thanks for the report and the suggestions. I don't know what happened on the docker environment but can you please check your locale settings?

[vt-alt]

[root@eca26e7a5988 /]# locale
LANG=
LC_CTYPE="POSIX"
LC_NUMERIC="POSIX"
LC_TIME="POSIX"
LC_COLLATE="POSIX"
LC_MONETARY="POSIX"
LC_MESSAGES="POSIX"
LC_PAPER="POSIX"
LC_NAME="POSIX"
LC_ADDRESS="POSIX"
LC_TELEPHONE="POSIX"
LC_MEASUREMENT="POSIX"
LC_IDENTIFICATION="POSIX"
LC_ALL=

But this prompted me to try other locale:

[root@eca26e7a5988 /]# export LANG=en_US.UTF-8
[root@eca26e7a5988 /]# locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=
[root@eca26e7a5988 /]#

After this TUI graph is the same broken. But I notice error message, they are due to absence of glibc-locales.

[root@eca26e7a5988 /]# apt-get install -y glibc-locales
[root@eca26e7a5988 /]# locale
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

After this (still with LANG=en_US.UTF-8) graph is fixed:

   16.988  s : (1) apt-get
   10.149 us :  ├─(4) std::basic_ostream::basic_ostream
    1.329 us :  │  ├─(4) std::ios_base::ios_base
    0.293 us :  │  │ (4) std::locale::locale
             :  │  │
    4.869 us :  │  └─(4) std::basic_ios::init
    2.189 us :  │     ├─(4) std::ios_base::_M_init

Thanks for the suggestions!

After this install and with unset LANG which returns to a POSIX locale graph is broken again:

   16.988  s : (1) apt-get
   10.149 us :   ~T~\ ~T~@(4) std::basic_ostream::basic_ostream
    1.329 us :   ~T~B   ~T~\ ~T~@(4) std::ios_base::ios_base
    0.293 us :   ~T~B   ~T~B (4) std::locale::locale
             :   ~T~B   ~T~B
    4.869 us :   ~T~B   ~T~T ~T~@(4) std::basic_ios::init

It seems that we don't have LANG nor any LC_* env set out Docker image.

I checked other distros, Fedora have LANG=C.UTF-8 in their fedora:rawhide docker image (for run command), but ubuntu:mantic nor debian:12 do not have LANG set.

[vt-alt]

So I want everything collapsed in Graph view (G) but when I press C it only collapses a single branch like c, not everything. 🤷

I realized I could C on the top node and this collapses everything like I wanted. 👌

[namhyung]

Ok, sounds like we can check if LANG has "UTF-8" and then use the unicode glyphs.