On Tue, Dec 03, 2019 at 07:46:03AM +0100, Michael Olbrich wrote:
> On Thu, Nov 28, 2019 at 12:19:44AM +0100, Florian Klink wrote:
> > Some distributions might not have bash in /bin, but in $PATH.
> >
> > Using #!/usr/bin/env bash solves this, and is consistent with how the
> > perl and python shebangs look like in the tree.
> > ---
> > scripts/canon-a1100-image | 2 +-
> > scripts/check_size | 2 +-
> > scripts/dfuboot.sh | 2 +-
> > scripts/extract_symbol_offset | 2 +-
> > scripts/gen-dtb-s | 2 +-
> > scripts/genenv | 2 +-
> > scripts/socfpga_get_sequencer | 2 +-
> > scripts/socfpga_import_preloader | 2 +-
> > scripts/socfpga_xml_to_config.sh | 2 +-
> > 9 files changed, 9 insertions(+), 9 deletions(-)
> >
> > diff --git a/scripts/canon-a1100-image b/scripts/canon-a1100-image
> > index 6c08d7493..237ce26d8 100755
> > --- a/scripts/canon-a1100-image
> > +++ b/scripts/canon-a1100-image
> > @@ -1,4 +1,4 @@
> > -#!/bin/bash -e
> > +#!/usr/bin/env bash -e
>
> This does not work:
>
> /usr/bin/env: ‘bash -e’: No such file or directory
> /usr/bin/env: use -[v]S to pass options in shebang lines
>
> Using '/usr/bin/env -S bash -e' works, but I'm not sure how portable that
> is.
According to execve(2) [1], this behaviour is specific to Linux:
The semantics of the optional-arg argument of an interpreter script
vary across implementations. On Linux, the entire string following
the interpreter name is passed as a single argument to the
interpreter, and this string can include white space. However,
behavior differs on some other systems. Some systems use the first
white space to terminate optional-arg. On some systems, an
interpreter script can have multiple arguments, and white spaces in
optional-arg are used to delimit the arguments.
So /usr/bin/env apparently does some argument splitting itself when
called with -S.
[1]: http://man7.org/linux/man-pages/man2/execve.2.html#NOTES
- Roland
--
Roland Hieber, Pengutronix e.K. | r.hieber@xxxxxxxxxxxxxx |
Steuerwalder Str. 21 | https://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
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