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Prompt sample: Debian chroot environment

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When you chroot in Debian, bash shows the chroot environment in the prompt:

```bash

...

if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)
fi

PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '

...
```

This is the effect:

```
(chroot_env) user@host:~#
```

It is useful when chrooting, since usually the hostname remains the same and thus you can't distinguish where you are.
This commit is contained in:
Maurizio De Santis
2014-03-21 17:48:35 +01:00
committed by ridiculousfish
parent e530af1ff7
commit 4285baa6e1
1 changed files with 55 additions and 0 deletions
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55
share/tools/web_config/sample_prompts/debian_chroot.fish Normal file
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# name: Debian chroot
# author: Maurizio De Santis
function fish_prompt --description 'Write out the prompt, prepending the Debian chroot environment if present'
# Just calculate these once, to save a few cycles when displaying the prompt
if not set -q __fish_prompt_hostname
set -g __fish_prompt_hostname (hostname|cut -d . -f 1)
end
if not set -q __fish_prompt_normal
set -g __fish_prompt_normal (set_color normal)
end
if not set -q __fish_prompt_chroot_env
set -g __fish_prompt_chroot_env (set_color yellow)
end
# Set variable identifying the chroot you work in (used in the prompt below)
if begin; not set -q debian_chroot; and test -r /etc/debian_chroot; end
set debian_chroot (cat /etc/debian_chroot)
end
if begin; not set -q __fish_debian_chroot_prompt; and set -q debian_chroot; and test -n $debian_chroot; end
set -g __fish_debian_chroot_prompt "($debian_chroot)"
end
# Prepend the chroot environment if present
if set -q __fish_debian_chroot_prompt
echo -n -s "$__fish_prompt_chroot_env" "$__fish_debian_chroot_prompt" "$__fish_prompt_normal" ' '
end
switch $USER
case root
if not set -q __fish_prompt_cwd
if set -q fish_color_cwd_root
set -g __fish_prompt_cwd (set_color $fish_color_cwd_root)
else
set -g __fish_prompt_cwd (set_color $fish_color_cwd)
end
end
echo -n -s "$USER" @ "$__fish_prompt_hostname" ' ' "$__fish_prompt_cwd" (prompt_pwd) "$__fish_prompt_normal" '# '
case '*'
if not set -q __fish_prompt_cwd
set -g __fish_prompt_cwd (set_color $fish_color_cwd)
end
echo -n -s "$USER" @ "$__fish_prompt_hostname" ' ' "$__fish_prompt_cwd" (prompt_pwd) "$__fish_prompt_normal" '> '
end
end