Public bug reported:
The new-ish "apt" command draws its progress bar and produces escape
codes regardless of advertised terminal capabilities; in particular,
with TERM=dumb, "apt" still produces save_cursor and restore_cursor
escape codes ("\0337" and "\0338"), in addition to colors and other ANSI
escapes.
An example of a commonly used shell with TERM=dump is Emacs' shell
buffers. In these, running "apt" produces the following:
```
(Reading database ... 363533 files and directories currently installed.)
Removing wireshark (2.0.2+ga16e22e-1) ...
7Progress: [ 0%]
[...............................................................................................]
87Progress: [ 25%]
[########################.......................................................................]
87Progress: [ 50%]
[################################################...............................................]
87Progress: [ 75%]
[########################################################################.......................]
8
7[0;30r8[1A[J
```
This is due in part to the PackageManagerFancy::DrawStatusLine()
function in apt-pkg/install-progress.cc.
Note that Emacs can process and display typical SGR ANSI escapes (in the
form [<number>m; but not the more complex cursor manipulation commands.
```
$ apt policy apt
apt:
Installed: 1.2.12~ubuntu16.04.1
Candidate: 1.2.12~ubuntu16.04.1
Version table:
*** 1.2.12~ubuntu16.04.1 500
500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.2.10ubuntu1 500
500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
```
** Affects: apt (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1606270
Title:
"apt" command line tool does not correctly check for terminal
capabilities
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