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File Name : polyfills.js

var constants = require('constants')

var origCwd = process.cwd
var cwd = null

var platform = process.env.GRACEFUL_FS_PLATFORM || process.platform

process.cwd = function() {
  if (!cwd)
    cwd = origCwd.call(process)
  return cwd
}
try {
  process.cwd()
} catch (er) {}

var chdir = process.chdir
process.chdir = function(d) {
  cwd = null
  chdir.call(process, d)
}

module.exports = patch

function patch (fs) {
  // (re-)implement some things that are known busted or missing.

// lchmod, broken prior to 0.6.2
  // back-port the fix here.
  if (constants.hasOwnProperty('O_SYMLINK') &&
      process.version.match(/^v0\.6\.[0-2]|^v0\.5\./)) {
    patchLchmod(fs)
  }

// lutimes implementation, or no-op
  if (!fs.lutimes) {
    patchLutimes(fs)
  }

// https://github.com/isaacs/node-graceful-fs/issues/4
  // Chown should not fail on einval or eperm if non-root.
  // It should not fail on enosys ever, as this just indicates
  // that a fs doesn't support the intended operation.

fs.chown = chownFix(fs.chown)
  fs.fchown = chownFix(fs.fchown)
  fs.lchown = chownFix(fs.lchown)

fs.chmod = chmodFix(fs.chmod)
  fs.fchmod = chmodFix(fs.fchmod)
  fs.lchmod = chmodFix(fs.lchmod)

fs.chownSync = chownFixSync(fs.chownSync)
  fs.fchownSync = chownFixSync(fs.fchownSync)
  fs.lchownSync = chownFixSync(fs.lchownSync)

fs.chmodSync = chmodFixSync(fs.chmodSync)
  fs.fchmodSync = chmodFixSync(fs.fchmodSync)
  fs.lchmodSync = chmodFixSync(fs.lchmodSync)

fs.stat = statFix(fs.stat)
  fs.fstat = statFix(fs.fstat)
  fs.lstat = statFix(fs.lstat)

fs.statSync = statFixSync(fs.statSync)
  fs.fstatSync = statFixSync(fs.fstatSync)
  fs.lstatSync = statFixSync(fs.lstatSync)

// if lchmod/lchown do not exist, then make them no-ops
  if (!fs.lchmod) {
    fs.lchmod = function (path, mode, cb) {
      if (cb) process.nextTick(cb)
    }
    fs.lchmodSync = function () {}
  }
  if (!fs.lchown) {
    fs.lchown = function (path, uid, gid, cb) {
      if (cb) process.nextTick(cb)
    }
    fs.lchownSync = function () {}
  }

// on Windows, A/V software can lock the directory, causing this
  // to fail with an EACCES or EPERM if the directory contains newly
  // created files.  Try again on failure, for up to 60 seconds.

// Set the timeout this long because some Windows Anti-Virus, such as Parity
  // bit9, may lock files for up to a minute, causing npm package install
  // failures. Also, take care to yield the scheduler. Windows scheduling gives
  // CPU to a busy looping process, which can cause the program causing the lock
  // contention to be starved of CPU by node, so the contention doesn't resolve.
  if (platform === "win32") {
    fs.rename = (function (fs$rename) { return function (from, to, cb) {
      var start = Date.now()
      var backoff = 0;
      fs$rename(from, to, function CB (er) {
        if (er
            && (er.code === "EACCES" || er.code === "EPERM")
            && Date.now() - start < 60000) {
          setTimeout(function() {
            fs.stat(to, function (stater, st) {
              if (stater && stater.code === "ENOENT")
                fs$rename(from, to, CB);
              else
                cb(er)
            })
          }, backoff)
          if (backoff < 100)
            backoff += 10;
          return;
        }
        if (cb) cb(er)
      })
    }})(fs.rename)
  }

// if read() returns EAGAIN, then just try it again.
  fs.read = (function (fs$read) { return function (fd, buffer, offset, length, position, callback_) {
    var callback
    if (callback_ && typeof callback_ === 'function') {
      var eagCounter = 0
      callback = function (er, _, __) {
        if (er && er.code === 'EAGAIN' && eagCounter < 10) {
          eagCounter ++
          return fs$read.call(fs, fd, buffer, offset, length, position, callback)
        }
        callback_.apply(this, arguments)
      }
    }
    return fs$read.call(fs, fd, buffer, offset, length, position, callback)
  }})(fs.read)

fs.readSync = (function (fs$readSync) { return function (fd, buffer, offset, length, position) {
    var eagCounter = 0
    while (true) {
      try {
        return fs$readSync.call(fs, fd, buffer, offset, length, position)
      } catch (er) {
        if (er.code === 'EAGAIN' && eagCounter < 10) {
          eagCounter ++
          continue
        }
        throw er
      }
    }
  }})(fs.readSync)

function patchLchmod (fs) {
    fs.lchmod = function (path, mode, callback) {
      fs.open( path
             , constants.O_WRONLY | constants.O_SYMLINK
             , mode
             , function (err, fd) {
        if (err) {
          if (callback) callback(err)
          return
        }
        // prefer to return the chmod error, if one occurs,
        // but still try to close, and report closing errors if they occur.
        fs.fchmod(fd, mode, function (err) {
          fs.close(fd, function(err2) {
            if (callback) callback(err || err2)
          })
        })
      })
    }

fs.lchmodSync = function (path, mode) {
      var fd = fs.openSync(path, constants.O_WRONLY | constants.O_SYMLINK, mode)

// prefer to return the chmod error, if one occurs,
      // but still try to close, and report closing errors if they occur.
      var threw = true
      var ret
      try {
        ret = fs.fchmodSync(fd, mode)
        threw = false
      } finally {
        if (threw) {
          try {
            fs.closeSync(fd)
          } catch (er) {}
        } else {
          fs.closeSync(fd)
        }
      }
      return ret
    }
  }

function patchLutimes (fs) {
    if (constants.hasOwnProperty("O_SYMLINK")) {
      fs.lutimes = function (path, at, mt, cb) {
        fs.open(path, constants.O_SYMLINK, function (er, fd) {
          if (er) {
            if (cb) cb(er)
            return
          }
          fs.futimes(fd, at, mt, function (er) {
            fs.close(fd, function (er2) {
              if (cb) cb(er || er2)
            })
          })
        })
      }

fs.lutimesSync = function (path, at, mt) {
        var fd = fs.openSync(path, constants.O_SYMLINK)
        var ret
        var threw = true
        try {
          ret = fs.futimesSync(fd, at, mt)
          threw = false
        } finally {
          if (threw) {
            try {
              fs.closeSync(fd)
            } catch (er) {}
          } else {
            fs.closeSync(fd)
          }
        }
        return ret
      }

} else {
      fs.lutimes = function (_a, _b, _c, cb) { if (cb) process.nextTick(cb) }
      fs.lutimesSync = function () {}
    }
  }

function chmodFix (orig) {
    if (!orig) return orig
    return function (target, mode, cb) {
      return orig.call(fs, target, mode, function (er) {
        if (chownErOk(er)) er = null
        if (cb) cb.apply(this, arguments)
      })
    }
  }

function chmodFixSync (orig) {
    if (!orig) return orig
    return function (target, mode) {
      try {
        return orig.call(fs, target, mode)
      } catch (er) {
        if (!chownErOk(er)) throw er
      }
    }
  }

function chownFix (orig) {
    if (!orig) return orig
    return function (target, uid, gid, cb) {
      return orig.call(fs, target, uid, gid, function (er) {
        if (chownErOk(er)) er = null
        if (cb) cb.apply(this, arguments)
      })
    }
  }

function chownFixSync (orig) {
    if (!orig) return orig
    return function (target, uid, gid) {
      try {
        return orig.call(fs, target, uid, gid)
      } catch (er) {
        if (!chownErOk(er)) throw er
      }
    }
  }

function statFix (orig) {
    if (!orig) return orig
    // Older versions of Node erroneously returned signed integers for
    // uid + gid.
    return function (target, cb) {
      return orig.call(fs, target, function (er, stats) {
        if (!stats) return cb.apply(this, arguments)
        if (stats.uid < 0) stats.uid += 0x100000000
        if (stats.gid < 0) stats.gid += 0x100000000
        if (cb) cb.apply(this, arguments)
      })
    }
  }

function statFixSync (orig) {
    if (!orig) return orig
    // Older versions of Node erroneously returned signed integers for
    // uid + gid.
    return function (target) {
      var stats = orig.call(fs, target)
      if (stats.uid < 0) stats.uid += 0x100000000
      if (stats.gid < 0) stats.gid += 0x100000000
      return stats;
    }
  }

// ENOSYS means that the fs doesn't support the op. Just ignore
  // that, because it doesn't matter.
  //
  // if there's no getuid, or if getuid() is something other
  // than 0, and the error is EINVAL or EPERM, then just ignore
  // it.
  //
  // This specific case is a silent failure in cp, install, tar,
  // and most other unix tools that manage permissions.
  //
  // When running as root, or if other types of errors are
  // encountered, then it's strict.
  function chownErOk (er) {
    if (!er)
      return true

if (er.code === "ENOSYS")
      return true

var nonroot = !process.getuid || process.getuid() !== 0
    if (nonroot) {
      if (er.code === "EINVAL" || er.code === "EPERM")
        return true
    }

return false
  }
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-03-03 10:41:37
..	dir	-	root/root	0755	2024-03-03 10:41:36
LICENSE	text/plain	781 B	root/root	0644	2021-10-19 09:47:53
README.md	text/plain	4.35 KB	root/root	0644	2021-10-19 09:47:53
clone.js	text/plain	401 B	root/root	0644	2021-10-19 09:47:53
graceful-fs.js	text/plain	7.38 KB	root/root	0644	2021-10-19 09:47:53
legacy-streams.js	text/plain	2.59 KB	root/root	0644	2021-10-19 09:47:53
package.json	application/json	2.36 KB	root/root	0644	2021-10-19 09:47:53
polyfills.js	text/plain	8.92 KB	root/root	0644	2021-10-19 09:47:53

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