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mkdirall.go
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mkdirall.go
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/***************************************************************
*
* Copyright (C) 2024, Pelican Project, Morgridge Institute for Research
*
* Licensed under the Apache License, Version 2.0 (the "License"); you
* may not use this file except in compliance with the License. You may
* obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
***************************************************************/
package config
import (
"os"
"os/exec"
"runtime"
"syscall"
"github.com/pkg/errors"
)
// This is the pelican version of `MkdirAll`; ensures that any created directory
// is owned by a given uid/gid. This allows the created directory to be owned by
// the xrootd user.
// The base implementation is taken from the go std library, here:
// - https://cs.opensource.google/go/go/+/refs/tags/go1.21.0:src/os/path.go;l=18
// The BSD license for go is compatible with pelican's
func MkdirAll(path string, perm os.FileMode, uid int, gid int) error {
// Fast path: if we can tell whether path is a directory or file, stop with success or error.
dir, err := os.Stat(path)
if err == nil {
if dir.IsDir() {
return nil
}
return &os.PathError{Op: "mkdir", Path: path, Err: syscall.ENOTDIR}
}
// Slow path: make sure parent exists and then call Mkdir for path.
i := len(path)
for i > 0 && os.IsPathSeparator(path[i-1]) { // Skip trailing path separator.
i--
}
j := i
for j > 0 && !os.IsPathSeparator(path[j-1]) { // Scan backward over element.
j--
}
if j > 1 {
// Create parent.
err = MkdirAll(fixRootDirectory(path[:j-1]), perm, uid, gid)
if err != nil {
return err
}
}
// Parent now exists; invoke Mkdir and use its result.
err = os.Mkdir(path, perm)
if err != nil {
// Handle arguments like "foo/." by
// double-checking that directory doesn't exist.
dir, err1 := os.Lstat(path)
if err1 == nil && dir.IsDir() {
return nil
}
return err
}
user, err := GetDaemonUser()
if err != nil {
return err
}
groupname, err := GetDaemonGroup()
if err != nil {
return err
}
// Windows does not have "chown", has to work differently
currentOS := runtime.GOOS
if currentOS == "windows" {
cmd := exec.Command("icacls", path, "/grant", user+":F")
output, err := cmd.CombinedOutput()
if err != nil {
return errors.Wrapf(err, "Failed to chown directory %v to groupname %v: %s",
path, groupname, string(output))
}
return nil
} else { // Else we are running on linux/mac
if err = os.Chown(path, uid, gid); err != nil {
return errors.Wrapf(err, "Failed to chown directory %v to groupname %v",
path, groupname)
}
}
return nil
}