mirror of
https://github.com/balena-io/balena-cli.git
synced 2024-12-29 18:18:50 +00:00
98 lines
3.0 KiB
TypeScript
98 lines
3.0 KiB
TypeScript
/**
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* @license
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* Copyright 2021 Balena Ltd.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { promises as fs, constants } from 'fs';
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import * as path from 'path';
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export const { F_OK, R_OK, W_OK, X_OK } = constants;
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export async function exists(filename: string, mode = F_OK) {
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try {
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await fs.access(filename, mode);
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return true;
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} catch {
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return false;
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}
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}
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/**
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* Replace sequences of untowardly characters like /[<>:"/\\|?*\u0000-\u001F]/g
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* and '.' or '..' with an underscore, plus other rules enforced by the filenamify
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* package. See https://github.com/sindresorhus/filenamify/
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*/
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export function sanitizePath(filepath: string) {
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const filenamify = require('filenamify') as typeof import('filenamify');
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// normalize also converts forward slash to backslash on Windows
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return path
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.normalize(filepath)
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.split(path.sep)
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.map((f) => filenamify(f, { replacement: '_' }))
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.join(path.sep);
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}
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/**
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* Given a program name like 'mount', search for it in a pre-defined set of
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* folders ('/usr/bin', '/bin', '/usr/sbin', '/sbin') and return the full path if found.
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*
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* For executables, in some scenarios, this can be more secure than allowing
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* any folder in the PATH. Only relevant on Linux or macOS.
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*/
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export async function whichBin(programName: string): Promise<string> {
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for (const dir of ['/usr/bin', '/bin', '/usr/sbin', '/sbin']) {
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const candidate = path.join(dir, programName);
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if (await exists(candidate, X_OK)) {
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return candidate;
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}
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}
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return '';
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}
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/**
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* Error handling wrapper around the npm `which` package:
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* "Like the unix which utility. Finds the first instance of a specified
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* executable in the PATH environment variable. Does not cache the results,
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* so hash -r is not needed when the PATH changes."
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*
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* @param program Basename of a program, for example 'ssh'
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* @param rejectOnMissing If the program cannot be found, reject the promise
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* with an ExpectedError instead of fulfilling it with an empty string.
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* @returns The program's full path, e.g. 'C:\WINDOWS\System32\OpenSSH\ssh.EXE'
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*/
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export async function which(
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program: string,
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rejectOnMissing = true,
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): Promise<string> {
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const whichMod = await import('which');
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let programPath: string;
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try {
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programPath = await whichMod(program);
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} catch (err) {
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if (err.code === 'ENOENT') {
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if (rejectOnMissing) {
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const { ExpectedError } = await import('../errors');
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throw new ExpectedError(
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`'${program}' program not found. Is it installed?`,
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);
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} else {
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return '';
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}
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}
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throw err;
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}
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return programPath;
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}
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