void-packages/common/hooks/pre-pkg/03-rewrite-python-shebang.sh

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# This hook executes the following tasks:
# - rewrites python shebangs with the corresponding python version
hook() {
local pyver= shebang= off=
if [ -d ${PKGDESTDIR}/usr/lib/python* ]; then
pyver="$(find ${PKGDESTDIR}/usr/lib/python* -prune -type d | grep -o '[[:digit:]]\.[[:digit:]]$')"
fi
if [ -n "$python_version" ]; then
pyver="$python_version"
fi
if [ -n "$pyver" ]; then
shebang="#!/usr/bin/python${pyver%.*}"
fi
find "${PKGDESTDIR}" -type f -print0 | \
while IFS= read -r -d '' file; do
[ ! -s "$file" ] && continue
[ -z "$(sed -n -E -e 2q -e '/^#!.*([[:space:]]|\/)python([0-9]\.[0-9])?([[:space:]]+|$)/p' "$file")" ] && continue
[ -n "$shebang" ] || msg_error "cannot convert shebang, set python_version\n"
echo " Shebang converted to '$shebang': ${file#$PKGDESTDIR}"
sed -i "1s@.*python.*@${shebang}@" -- "$file"
done
}