github.com/Cloud-Foundations/Dominator@v0.3.4/lib/fsutil/force.go (about)

     1  package fsutil
     2  
     3  import (
     4  	"os"
     5  	"syscall"
     6  )
     7  
     8  func forceLink(oldname, newname string) error {
     9  	err := os.Link(oldname, newname)
    10  	if err == nil {
    11  		return nil
    12  	}
    13  	if os.IsPermission(err) {
    14  		// Blindly attempt to remove immutable attributes.
    15  		MakeMutable(oldname, newname)
    16  	} else if os.IsExist(err) {
    17  		forceRemove(newname)
    18  	}
    19  	return os.Link(oldname, newname)
    20  }
    21  
    22  func forceRemove(name string) error {
    23  	err := os.Remove(name)
    24  	if err == nil {
    25  		return nil
    26  	}
    27  	if os.IsPermission(err) {
    28  		// Blindly attempt to remove immutable attributes.
    29  		MakeMutable(name)
    30  	}
    31  	return os.Remove(name)
    32  }
    33  
    34  func forceRemoveAll(path string) error {
    35  	err := os.RemoveAll(path)
    36  	if err == nil {
    37  		return nil
    38  	}
    39  	if os.IsPermission(err) {
    40  		// Blindly attempt to remove immutable attributes.
    41  		MakeMutable(path)
    42  	}
    43  	return os.RemoveAll(path)
    44  }
    45  
    46  func forceRename(oldpath, newpath string) error {
    47  	err := os.Rename(oldpath, newpath)
    48  	if err == nil {
    49  		return nil
    50  	}
    51  	if os.IsPermission(err) {
    52  		// Blindly attempt to remove immutable attributes.
    53  		MakeMutable(oldpath, newpath)
    54  	} else if os.IsExist(err) {
    55  		if err := ForceRemoveAll(newpath); err != nil {
    56  			return err
    57  		}
    58  	} else if err.(*os.LinkError).Err == syscall.EISDIR {
    59  		if err := ForceRemoveAll(newpath); err != nil {
    60  			return err
    61  		}
    62  	}
    63  	return os.Rename(oldpath, newpath)
    64  }