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.
Reinis
> +
> +# @FUNCTION: _python_ln_rel
> +# @USAGE: <from> <to>
> +# @DESCRIPTION:
> +# Create a relative symlink.
> +_python_ln_rel() {
> + debug-print-function ${FUNCNAME} "${@}"
> +
> + local from=${1}
> + local to=${2}
> +
> + local frpath=${from%/*}/
> + local topath=${to%/*}/
> + local rel_path=
> +
> + # remove double slashes
> + frpath=${frpath/\/\///}
> + topath=${topath/\/\///}
> +
> + while [[ ${topath} ]]; do
> + local frseg=${frpath%%/*}
> + local toseg=${topath%%/*}
> +
> + if [[ ${frseg} != ${toseg} ]]; then
> + rel_path=../${rel_path}${frseg:+${frseg}/}
> + fi
> +
> + frpath=${frpath#${frseg}/}
> + topath=${topath#${toseg}/}
> + done
> + rel_path+=${frpath}${1##*/}
> +
> + debug-print "${FUNCNAME}: ${from} -> ${to}"
> + debug-print "${FUNCNAME}: rel_path = ${rel_path}"
> +
> + ln -fs "${rel_path}" "${to}"
> +}
> +
> +# @FUNCTION: python_replicate_scripts
> +# @USAGE: <path>...
> +# @DESCRIPTION:
> +# Copy the given script to variants for all enabled Python
> +# implementations, then replace it with a symlink to the wrapper.
> +#
> +# All specified files must start with a 'python' shebang. A file not
> +# having a matching shebang will be refused.
> +python_replicate_scripts() {
> + debug-print-function ${FUNCNAME} "${@}"
> +
> + local suffixes=()
> +
> + _add_suffix() {
> + suffixes+=( "${EPYTHON}" )
> + }
> + python_foreach_impl _add_suffix
> + debug-print "${FUNCNAME}: suffixes = ( ${suffixes[@]} )"
> +
> + local f suffix
> + for suffix in "${suffixes[@]}"; do
> + for f; do
> + local newf=${f}-${suffix}
> +
> + debug-print "${FUNCNAME}: ${f} -> ${newf}"
> + cp "${f}" "${newf}" || die
> + done
> +
> + _python_rewrite_shebang "${suffix}" "${@/%/-${suffix}}"
> + done
> +
> + for f; do
> + _python_ln_rel "${ED}"/usr/bin/python-exec "${f}" || die
> + done
> +}
> --
> 1.7.12.4
>
>
