Red Hat Bugzilla – Bug 863780
Bash completion fails when egrep is aliased to 'egrep --color=always'
Last modified: 2013-08-01 13:54:48 EDT
Created attachment 622964 [details]
Patch fixing the problem in /etc/bash_completion.d/git
Git's Bash completion script uses egrep to generate possible completions. This fails if the user has aliased egrep to 'egrep --color=always' due to the generated color escape codes.
The attached patch fixes this by calling egrep in the completion script with '--color=never'.
Just FYI, this is being discussed in upstream but there is still no consensus if this is a bug or isn't.
> Just FYI, this is being discussed in upstream but there is still no
> consensus if this is a bug or isn't.
Thanks, Adam. Although I understand Junio's concerns of the patch being rather specific, I think there is a difference between (i) protecting against arbitrary aliases and (ii) protecting against aliases that set some default options.
Protecting against someone aliasing 'grep' to 'shutdown' might be overkill, but using an alias to set, e.g., the preferred output format for a program should have no effect on other--in particular non-interactive--users of this program.
An alias should be considered a definition for interactive shell uses only, and if the shell cannot protect non-interactive scripts from aliases, such scripts should protect themselves. Ideally, the shell would have an "undefine all aliases for this process and all subprocesses" command.
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