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nodejs/configure
Eli Schwartz b21556d28b build: fix inability to detect correct python command in configure
The "which" utility is not guaranteed to be installed, and if it is, its
behavior is not portable.

Conversely, the "command -v" shell builtin is required to exist in all
POSIX 2008 compliant shells, and is thus guaranteed to work everywhere.

Examples of open-source shells likely to be installed as /bin/sh on
Linux, which implement the 12-year-old standard: ash, bash, busybox,
dash, ksh, mksh and zsh.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>

PR-URL: https://github.com/nodejs/node/pull/32925
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
2020-05-25 19:24:28 +02:00

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#!/bin/sh
# Locate an acceptable python interpreter and then re-execute the script.
# Note that the mix of single and double quotes is intentional,
# as is the fact that the ] goes on a new line.
_=[ 'exec' '/bin/sh' '-c' '''
test ${FORCE_PYTHON2} && exec python2 "$0" "$@" # workaround for gclient
command -v python3.8 >/dev/null && exec python3.8 "$0" "$@"
command -v python3.7 >/dev/null && exec python3.7 "$0" "$@"
command -v python3.6 >/dev/null && exec python3.6 "$0" "$@"
command -v python3.5 >/dev/null && exec python3.5 "$0" "$@"
command -v python2.7 >/dev/null && exec python2.7 "$0" "$@"
exec python "$0" "$@"
''' "$0" "$@"
]
del _
import sys
from distutils.spawn import find_executable
print('Node.js configure: Found Python {0}.{1}.{2}...'.format(*sys.version_info))
acceptable_pythons = ((3, 8), (3, 7), (3, 6), (3, 5), (2, 7))
if sys.version_info[:2] in acceptable_pythons:
import configure
else:
python_cmds = ['python{0}.{1}'.format(*vers) for vers in acceptable_pythons]
sys.stderr.write('Please use {0}.\n'.format(' or '.join(python_cmds)))
for python_cmd in python_cmds:
python_cmd_path = find_executable(python_cmd)
if python_cmd_path and 'pyenv/shims' not in python_cmd_path:
sys.stderr.write('\t{0} {1}\n'.format(python_cmd_path,
' '.join(sys.argv[:1])))
sys.exit(1)