[Bug 2029465] Re: autopkgtest fails due to netcat-openbsd prints connection info on stderr

[Shengjing Zhu]

With netcat-openbsd 1.219-1ubuntu1

ubuntu at ubuntu-devel:~$ nc.openbsd -z 127.0.0.1 22
ubuntu at ubuntu-devel:~$ 

It prints nothing.

With netcat-openbsd 1.225-1ubuntu1

$ nc.openbsd -z 127.0.0.1 22
Connection to 127.0.0.1 22 port [tcp/ssh] succeeded!
ubuntu at ubuntu-devel:~$ 

It prints info on stderr.

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Title:
  autopkgtest fails due to netcat-openbsd prints connection info on
  stderr

Status in davmail package in Ubuntu:
  New
Status in ganglia package in Ubuntu:
  New
Status in netcat-openbsd package in Ubuntu:
  New

Bug description:
  https://autopkgtest.ubuntu.com/results/autopkgtest-
  mantic/mantic/amd64/d/davmail/20230801_081825_da2e8@/log.gz

  260s autopkgtest [08:18:03]: test binary-starts: [-----------------------
  261s 2023-08-01 08:18:03,408 DEBUG [main] davmail.DavGateway  - Start DavMail in server mode
  261s 2023-08-01 08:18:03,443 INFO  [main] davmail  - DavMail Gateway 6.1.0-trunk listening on SMTP port 1025 POP port 1110 IMAP port 1143 CALDAV port 1080 LDAP port 1389 
  270s Connection to localhost (::1) 1025 port [tcp/*] succeeded!
  270s 2023-08-01 08:18:13,251 DEBUG [davmail.smtp.SmtpServer] davmail  - Connection from /0:0:0:0:0:0:0:1 on port 1025
  270s 2023-08-01 08:18:13,253 INFO  [davmail.smtp.SmtpServer] davmail.connection  - CONNECT - 0:0:0:0:0:0:0:1:39534 
  270s 2023-08-01 08:18:13,254 DEBUG [Shutdown] davmail  - Stopping DavMail gateway
  270s 2023-08-01 08:18:13,256 INFO  [davmail.smtp.SmtpServer] davmail.connection  - DISCONNECT - 0:0:0:0:0:0:0:1:39534 
  271s autopkgtest [08:18:14]: test binary-starts: -----------------------]
  271s autopkgtest [08:18:14]: test binary-starts:  - - - - - - - - - - results - - - - - - - - - -
  271s binary-starts        FAIL stderr: Connection to localhost (::1) 1025 port [tcp/*] succeeded!
  271s autopkgtest [08:18:14]: test binary-starts:  - - - - - - - - - - stderr - - - - - - - - - -

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