On Sat, 27 Oct 2012 16:27:27 +0300 Reinis Danne <rei4...@gmail.com> wrote:
> On Sat, Oct 27, 2012 at 01:02:47PM +0200, Michał Górny wrote:
> > This can be used to create copies of Python scripts for various
> > implementation when build system doesn't do that.
> > ---
> > gx86/eclass/python-r1.eclass | 126
> > +++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 126 insertions(+)
> >
> > diff --git a/gx86/eclass/python-r1.eclass b/gx86/eclass/python-r1.eclass
> > index d7cdfa8..6178969 100644
> > --- a/gx86/eclass/python-r1.eclass
> > +++ b/gx86/eclass/python-r1.eclass
> > @@ -412,3 +412,129 @@ python_export_best() {
> > debug-print "${FUNCNAME}: Best implementation is: ${impl}"
> > python_export "${impl}" "${@}"
> > }
> > +
> > +# @FUNCTION: _python_rewrite_shebang
> > +# @INTERNAL
> > +# @USAGE: [<EPYTHON>] <path>...
> > +# @DESCRIPTION:
> > +# Replaces 'python' executable in the shebang with the executable name
> > +# of the specified interpreter. If no EPYTHON value (implementation) is
> > +# used, the current ${EPYTHON} will be used.
> > +#
> > +# All specified files must start with a 'python' shebang. A file not
> > +# having a matching shebang will be refused. The exact shebang style
> > +# will be preserved in order not to break anything.
> > +#
> > +# Example conversions:
> > +# @CODE
> > +# From: #!/usr/bin/python -R
> > +# To: #!/usr/bin/python2.7 -R
> > +#
> > +# From: #!/usr/bin/env FOO=bar python
> > +# To: #!/usr/bin/env FOO=bar python2.7
> > +# @CODE
> > +_python_rewrite_shebang() {
> > + debug-print-function ${FUNCNAME} "${@}"
> > +
> > + local impl
> > + case "${1}" in
> > + python*|jython*|pypy-c*)
> > + impl=${1}
> > + shift
> > + ;;
> > + *)
> > + impl=${EPYTHON}
> > + [[ ${impl} ]] || die "${FUNCNAME}: no impl nor EPYTHON"
> > + ;;
> > + esac
> > + debug-print "${FUNCNAME}: implementation: ${impl}"
> > +
> > + local f
> > + for f; do
> > + local shebang=$(head -n 1 "${f}")
> > + debug-print "${FUNCNAME}: path = ${f}"
> > + debug-print "${FUNCNAME}: shebang = ${shebang}"
> > +
> > + if [[ ${shebang} != *python* ]]; then
> > + eerror "A file does not seem to have a supported
> > shebang:"
> > + eerror " file: ${f}"
> > + eerror " shebang: ${shebang}"
> > + die "${FUNCNAME}: ${f} does not seem to have a valid
> > shebang"
> > + fi
> > +
> > + sed -i -e "s:python:${impl}:" "${f}" || die
> > + done
> > +}
>
> Better would be also to check if the shebang already has
> specific python version and in such a case probably an error
> message would be appropriate, so ebuild should explicitly change
> it to bare "python" if replication for versions is desired.
To be honest, I think I lack a good, simple way of guessing that. But I
guess a hack like [[ "${shebang} " != *'python '* ]] could work.
On the other hand, I'm not sure if it shouldn't work on things like
'python2' as well. But then, if someone ever needs that working, he can
ping me/report a bug.
--
Best regards,
Michał Górny
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