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astring.strip_console_codes raises error on recent kernel messages #133

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smitterl opened this issue Aug 7, 2024 · 1 comment · May be fixed by #134
Open

astring.strip_console_codes raises error on recent kernel messages #133

smitterl opened this issue Aug 7, 2024 · 1 comment · May be fixed by #134

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@smitterl
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smitterl commented Aug 7, 2024 •
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Applying the strip_console_codes to the output of a recent (rescue) kernel "6.10.0-15" boot messages, a test error is raised:

ERROR: c is not included in the known console codes list %[G@8]|\[[@A-HJ-MPXa-hl-nqrsu\`]|\[[\d;]+[HJKgqnrm]|#8|\([B0UK]|\)|\[\?2004[lh]

The location that hits this is after the 'read-only' in

[    0.527428] systemd[1]: Successfully made /usr/ read-only.
^[c^[[!p^[]104^G^[[?7h[    0.527576] systemd[1]: systemd 256-11<cut> running in system mode (+PAM +AUDIT +SELINUX -APPARMOR +IMA +SMACK +SECCOMP -GCRYPT -GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN -IPTC +KMOD +LIBCRYPTSETUP +LIBCRYPTSETUP_PLUGINS +LIBFDISK +PCRE2 +PWQUALITY +P11KIT -QRENCODE +TPM2 +BZIP2 +LZ4 +XZ +ZLIB +ZSTD +BPF_FRAMEWORK +XKBCOMMON +UTMP +SYSVINIT +LIBARCHIVE)

The tmp_word at this point is:

2024-08-07 09:57:07,684 astring          L0052 DEBUG| tmp_word: ^[
2024-08-07 09:57:07,684 astring          L0052 DEBUG| tmp_word: ^[c
2024-08-07 09:57:07,684 astring          L0052 DEBUG| tmp_word: ^[c^[
2024-08-07 09:57:07,684 astring          L0056 DEBUG| tmp_word: c

before it's recognized as unknown word.

IIUC "ESC c" is used to clear the console and in python this ESC is \x1b displayed as ^[. https://man7.org/linux/man-pages/man4/console_codes.4.html
smitterl added a commit to smitterl/aexpect that referenced this issue Aug 7, 2024
@smitterl
utils/astring: add expected control characters
e4f4a86 
Fixes: avocado-framework#133

In recent kernel boots, stripping raised error because of missing
control characters.

Add them:
`c` is clear/reset screen
`!p` - don't know
`]104` - don't know

Signed-off-by: Sebastian Mitterle <[email protected]>
@smitterl smitterl linked a pull request Aug 7, 2024 that will close this issue
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@smitterl
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It looks to me the sequences are:

ESC c: terminal reset
ESC !p: terminal reset
ESC ]: introduces an OS command

I don't have details about the OS command 104.

Ref. https://gist.github.com/justinmk/a5102f9a0c1810437885a04a07ef0a91

smitterl added a commit to smitterl/aexpect that referenced this issue Aug 30, 2024
@smitterl
utils/astring: add expected control characters
f8b6d37 
Fixes: avocado-framework#133

In recent kernel boots, stripping raised error because of missing
control characters.

Add them:
`c` reset screen
`!p` soft reset terminal
`]104` - execute OS command '104'

These control characters are listed in the xterm control sequence cheat
sheet at
https://gist.github.com/justinmk/a5102f9a0c1810437885a04a07ef0a91

Signed-off-by: Sebastian Mitterle <[email protected]>
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utils/astring: add expected control characters smitterl/aexpect
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