Re: Bug#1069978: bash: incorrect value of $BASH for login shells

[Gioele Barabucci]

On 28/04/24 20:01, Chet Ramey wrote:
> On 4/27/24 6:23 PM, Gioele Barabucci wrote:
> > bash 5.0 and 5.2 do not set $BASH to the right value when bash is used 
> > as the login shell:
> >
> >      $ apt install bash-static
> >      $ getent passwd $USER | cut -d: -f 7
> >      /bin/bash
> >
> >      $ su $USER -s /bin/bash-static -c 'echo $BASH; readlink 
> > /proc/$$/exe; true'
> >      /usr/bin/bash-static
> >      /usr/bin/bash-static
> >
> >      $ su -l $USER -s /bin/bash-static -c 'echo $BASH; readlink 
> > /proc/$$/exe; true'
> >      /bin/bash
> >      /usr/bin/bash-static
> >
> > (bash-static is not a link to bash)
>
> What does `su' pass to bash in argv[0]?


    $ su $USER -s /bin/bash-static -c 'echo $BASH; readlink 
/proc/$$/exe; head -1z /proc/$$/cmdline; echo'
    /usr/bin/bash-static
    /usr/bin/bash-static
    bash-static

    $ su -l $USER -s /bin/bash-static -c 'echo $BASH; readlink 
/proc/$$/exe; head -1z /proc/$$/cmdline; echo'
    /bin/bash
    /usr/bin/bash-static
    -bash-static

Regards,

--
Gioele Barabucci