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// This file is a modified version of the fs-extra's copySync method.
const { areIdentical, isSrcSubdir } = require('internal/fs/cp/cp');
const { codes } = require('internal/errors');
const {
os: {
errno: {
EEXIST,
EISDIR,
EINVAL,
ENOTDIR,
}
}
} = internalBinding('constants');
const {
ERR_FS_CP_DIR_TO_NON_DIR,
ERR_FS_CP_EEXIST,
ERR_FS_CP_EINVAL,
ERR_FS_CP_FIFO_PIPE,
ERR_FS_CP_NON_DIR_TO_DIR,
ERR_FS_CP_SOCKET,
ERR_FS_CP_SYMLINK_TO_SUBDIRECTORY,
ERR_FS_CP_UNKNOWN,
ERR_FS_EISDIR,
ERR_INVALID_RETURN_VALUE,
} = codes;
const {
chmodSync,
copyFileSync,
existsSync,
lstatSync,
mkdirSync,
opendirSync,
readlinkSync,
statSync,
symlinkSync,
unlinkSync,
utimesSync,
} = require('fs');
const {
dirname,
isAbsolute,
join,
parse,
resolve,
} = require('path');
const { isPromise } = require('util/types');
function cpSyncFn(src, dest, opts) {
// Warn about using preserveTimestamps on 32-bit node
if (opts.preserveTimestamps && process.arch === 'ia32') {
const warning = 'Using the preserveTimestamps option in 32-bit ' +
'node is not recommended';
process.emitWarning(warning, 'TimestampPrecisionWarning');
}
const { srcStat, destStat } = checkPathsSync(src, dest, opts);
checkParentPathsSync(src, srcStat, dest);
return handleFilterAndCopy(destStat, src, dest, opts);
}
function checkPathsSync(src, dest, opts) {
const { srcStat, destStat } = getStatsSync(src, dest, opts);
if (destStat) {
if (areIdentical(srcStat, destStat)) {
throw new ERR_FS_CP_EINVAL({
message: 'src and dest cannot be the same',
path: dest,
syscall: 'cp',
errno: EINVAL,
code: 'EINVAL',
});
}
if (srcStat.isDirectory() && !destStat.isDirectory()) {
throw new ERR_FS_CP_DIR_TO_NON_DIR({
message: `cannot overwrite directory ${src} ` +
`with non-directory ${dest}`,
path: dest,
syscall: 'cp',
errno: EISDIR,
code: 'EISDIR',
});
}
if (!srcStat.isDirectory() && destStat.isDirectory()) {
throw new ERR_FS_CP_NON_DIR_TO_DIR({
message: `cannot overwrite non-directory ${src} ` +
`with directory ${dest}`,
path: dest,
syscall: 'cp',
errno: ENOTDIR,
code: 'ENOTDIR',
});
}
}
if (srcStat.isDirectory() && isSrcSubdir(src, dest)) {
throw new ERR_FS_CP_EINVAL({
message: `cannot copy ${src} to a subdirectory of self ${dest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
code: 'EINVAL',
});
}
return { srcStat, destStat };
}
function getStatsSync(src, dest, opts) {
let destStat;
const statFunc = opts.dereference ?
(file) => statSync(file, { bigint: true }) :
(file) => lstatSync(file, { bigint: true });
const srcStat = statFunc(src);
try {
destStat = statFunc(dest);
} catch (err) {
if (err.code === 'ENOENT') return { srcStat, destStat: null };
throw err;
}
return { srcStat, destStat };
}
function checkParentPathsSync(src, srcStat, dest) {
const srcParent = resolve(dirname(src));
const destParent = resolve(dirname(dest));
if (destParent === srcParent || destParent === parse(destParent).root) return;
let destStat;
try {
destStat = statSync(destParent, { bigint: true });
} catch (err) {
if (err.code === 'ENOENT') return;
throw err;
}
if (areIdentical(srcStat, destStat)) {
throw new ERR_FS_CP_EINVAL({
message: `cannot copy ${src} to a subdirectory of self ${dest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
code: 'EINVAL',
});
}
return checkParentPathsSync(src, srcStat, destParent);
}
function handleFilterAndCopy(destStat, src, dest, opts) {
if (opts.filter) {
const shouldCopy = opts.filter(src, dest);
if (isPromise(shouldCopy)) {
throw new ERR_INVALID_RETURN_VALUE('boolean', 'filter', shouldCopy);
}
if (!shouldCopy) return;
}
const destParent = dirname(dest);
if (!existsSync(destParent)) mkdirSync(destParent, { recursive: true });
return getStats(destStat, src, dest, opts);
}
function startCopy(destStat, src, dest, opts) {
if (opts.filter && !opts.filter(src, dest)) return;
return getStats(destStat, src, dest, opts);
}
function getStats(destStat, src, dest, opts) {
const statSyncFn = opts.dereference ? statSync : lstatSync;
const srcStat = statSyncFn(src);
if (srcStat.isDirectory() && opts.recursive) {
return onDir(srcStat, destStat, src, dest, opts);
} else if (srcStat.isDirectory()) {
throw new ERR_FS_EISDIR({
message: `${src} is a directory (not copied)`,
path: src,
syscall: 'cp',
errno: EINVAL,
code: 'EISDIR',
});
} else if (srcStat.isFile() ||
srcStat.isCharacterDevice() ||
srcStat.isBlockDevice()) {
return onFile(srcStat, destStat, src, dest, opts);
} else if (srcStat.isSymbolicLink()) {
return onLink(destStat, src, dest, opts);
} else if (srcStat.isSocket()) {
throw new ERR_FS_CP_SOCKET({
message: `cannot copy a socket file: ${dest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
code: 'EINVAL',
});
} else if (srcStat.isFIFO()) {
throw new ERR_FS_CP_FIFO_PIPE({
message: `cannot copy a FIFO pipe: ${dest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
code: 'EINVAL',
});
}
throw new ERR_FS_CP_UNKNOWN({
message: `cannot copy an unknown file type: ${dest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
code: 'EINVAL',
});
}
function onFile(srcStat, destStat, src, dest, opts) {
if (!destStat) return copyFile(srcStat, src, dest, opts);
return mayCopyFile(srcStat, src, dest, opts);
}
function mayCopyFile(srcStat, src, dest, opts) {
if (opts.force) {
unlinkSync(dest);
return copyFile(srcStat, src, dest, opts);
} else if (opts.errorOnExist) {
throw new ERR_FS_CP_EEXIST({
message: `${dest} already exists`,
path: dest,
syscall: 'cp',
errno: EEXIST,
code: 'EEXIST',
});
}
}
function copyFile(srcStat, src, dest, opts) {
copyFileSync(src, dest);
if (opts.preserveTimestamps) handleTimestamps(srcStat.mode, src, dest);
return setDestMode(dest, srcStat.mode);
}
function handleTimestamps(srcMode, src, dest) {
// Make sure the file is writable before setting the timestamp
// otherwise open fails with EPERM when invoked with 'r+'
// (through utimes call)
if (fileIsNotWritable(srcMode)) makeFileWritable(dest, srcMode);
return setDestTimestamps(src, dest);
}
function fileIsNotWritable(srcMode) {
return (srcMode & 0o200) === 0;
}
function makeFileWritable(dest, srcMode) {
return setDestMode(dest, srcMode | 0o200);
}
function setDestMode(dest, srcMode) {
return chmodSync(dest, srcMode);
}
function setDestTimestamps(src, dest) {
// The initial srcStat.atime cannot be trusted
// because it is modified by the read(2) system call
// (See https://nodejs.org/api/fs.html#fs_stat_time_values)
const updatedSrcStat = statSync(src);
return utimesSync(dest, updatedSrcStat.atime, updatedSrcStat.mtime);
}
function onDir(srcStat, destStat, src, dest, opts) {
if (!destStat) return mkDirAndCopy(srcStat.mode, src, dest, opts);
return copyDir(src, dest, opts);
}
function mkDirAndCopy(srcMode, src, dest, opts) {
mkdirSync(dest);
copyDir(src, dest, opts);
return setDestMode(dest, srcMode);
}
function copyDir(src, dest, opts) {
const dir = opendirSync(src);
try {
let dirent;
while ((dirent = dir.readSync()) !== null) {
const { name } = dirent;
const srcItem = join(src, name);
const destItem = join(dest, name);
const { destStat } = checkPathsSync(srcItem, destItem, opts);
startCopy(destStat, srcItem, destItem, opts);
}
} finally {
dir.closeSync();
}
}
function onLink(destStat, src, dest, opts) {
let resolvedSrc = readlinkSync(src);
if (!opts.verbatimSymlinks && !isAbsolute(resolvedSrc)) {
resolvedSrc = resolve(dirname(src), resolvedSrc);
}
if (!destStat) {
return symlinkSync(resolvedSrc, dest);
}
let resolvedDest;
try {
resolvedDest = readlinkSync(dest);
} catch (err) {
// Dest exists and is a regular file or directory,
// Windows may throw UNKNOWN error. If dest already exists,
// fs throws error anyway, so no need to guard against it here.
if (err.code === 'EINVAL' || err.code === 'UNKNOWN') {
return symlinkSync(resolvedSrc, dest);
}
throw err;
}
if (!isAbsolute(resolvedDest)) {
resolvedDest = resolve(dirname(dest), resolvedDest);
}
if (isSrcSubdir(resolvedSrc, resolvedDest)) {
throw new ERR_FS_CP_EINVAL({
message: `cannot copy ${resolvedSrc} to a subdirectory of self ` +
`${resolvedDest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
code: 'EINVAL',
});
}
// Prevent copy if src is a subdir of dest since unlinking
// dest in this case would result in removing src contents
// and therefore a broken symlink would be created.
if (statSync(dest).isDirectory() && isSrcSubdir(resolvedDest, resolvedSrc)) {
throw new ERR_FS_CP_SYMLINK_TO_SUBDIRECTORY({
message: `cannot overwrite ${resolvedDest} with ${resolvedSrc}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
code: 'EINVAL',
});
}
return copyLink(resolvedSrc, dest);
}
function copyLink(resolvedSrc, dest) {
unlinkSync(dest);
return symlinkSync(resolvedSrc, dest);
}
module.exports = { cpSyncFn };
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