Package: ucf
Version: 3.0038+nmu1
Severity: normal
Selecting the "start a shell" option in ucf is fine for running simple
shell commands like cat, ls, cp, etc... but if you interact with it more
you'll discover it hasn't properly detached itself and begun a new
session.
In particular if you run a fullscreen editor like `vim` (because you
wanted to vimdiff between the old and new config files), you'll find
that trying to hit <Ctrl-Z> to background that vim will break
everything.
The situation at that moment will be:
(outer) bash
+-- apt-get update
+-- ucf
+-- (inner) bash
+-- vimdiff
My intention when pressing <Ctrl-Z> was to background just the vimdiff
and return to the inner bash that ucf had started. What actually
happened was that it backgrounded the entire set of processes, upto and
including the apt-get update, leaving me at the outer bash. This
happened without any of the usual terminal suspend logic running in e.g.
vim, meaning we're still in full altscreen mode, having not cleared the
screen, running the wrong termios settings, with mouse reporting
enabled, etc etc... This quite strongly confuses the outer bash which
wasn't expecting to receive mouse report events.
At this point realising my mistake, I `fg`, which makes the problem even
worse, as now apt or ucf resumes and generally the terminal is in quite
a mess. I couldn't easily work out a way out of this situation short of
`kill -9` every process involved, and begin a resuce attempt with
$ dpkg --reconfigure -a
$ apt-get install -f
Fixing this issue would be useful, as it would make running a subshell
less painful.
This also relates to #358154
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=358154
-- System Information:
Debian Release: buster/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.15.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages ucf depends on:
ii coreutils 8.30-1
ii debconf 1.5.69
ii sensible-utils 0.0.12
ucf recommends no packages.
ucf suggests no packages.
-- debconf information:
ucf/conflicts_found:
* ucf/changeprompt_threeway: keep_current
ucf/title:
* ucf/changeprompt: keep_current
* ucf/show_diff:
