On 2020-04-03 10:22:54+0200, SZEDER Gábor <szeder.dev@xxxxxxxxx> wrote:
> On Thu, Apr 02, 2020 at 08:04:01PM +0700, Đoàn Trần Công Danh wrote:
> > We're using "su -m" to preserve environment variables in the shell run
> > by "su". But, that options will be ignored while "-l" (aka "--login") is
> > specified.
>
> This is not true. See any previous runs of the 32 bit Linux job,
> which worked as expected, because none of these environment variables
> were cleared.
Different su have different behavior when combine "-m" and "-l"
util-linux's su has this as far as 60541961f, (docs: improve grammar,
wording and formatting of su man page, 2013-10-12)
-m, -p, --preserve-environment
Preserve the entire environment, i.e., it does not set HOME,
SHELL, USER nor LOGNAME. This option is ignored if the option
--login is specified.
https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/tree/login-utils/su.1#n120
Ubuntu (our Linux32 builder), ships su by shadow-utils:
Note that the default behavior for the environment is the following:
The $HOME, $SHELL, $USER, $LOGNAME, $PATH,
and $IFS environment variables are reset.
If --login is not used, the environment is copied,
except for the variables above.
If --login is used, the $TERM, $COLORTERM, $DISPLAY, and
$XAUTHORITY environment variables are copied if they were set.
There're no mentions of other variables, I _think_ our Linux32 works
by accident.
Alpine ships su from busybox, this su ignores "-m" if "-l" is set.
--
Danh
