audk/ShellPkg/Library/UefiShellLevel2CommandsLib/Rm.c

/** @file
  Main file for attrib shell level 2 function.

  Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "UefiShellLevel2CommandsLib.h"

STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
  {L"-q", TypeFlag},
  {NULL, TypeMax}
  };

BOOLEAN
EFIAPI
IsDirectoryEmpty (
  IN EFI_HANDLE   FileHandle
  )
{
  EFI_STATUS      Status;
  EFI_FILE_INFO   *FileInfo;
  BOOLEAN         NoFile;
  BOOLEAN         RetVal;

  RetVal = TRUE;
  NoFile = FALSE;

  for (Status = FileHandleFindFirstFile(FileHandle, &FileInfo)
    ;  !NoFile
    ;  Status = FileHandleFindNextFile(FileHandle, FileInfo, &NoFile)
   ){
    if (StrStr(FileInfo->FileName, L".") != FileInfo->FileName
      &&StrStr(FileInfo->FileName, L"..") != FileInfo->FileName) {
      RetVal = FALSE;
    }
  }
  return (RetVal);
}

SHELL_STATUS
EFIAPI
CascadeDelete(
  IN EFI_SHELL_FILE_INFO  *Node,
  IN CONST BOOLEAN        Quiet
  )
{
  SHELL_STATUS          ShellStatus;
  EFI_SHELL_FILE_INFO   *List;
  EFI_SHELL_FILE_INFO   *Node2;
  EFI_STATUS            Status;
  SHELL_PROMPT_RESPONSE *Resp;

  Resp                  = NULL;
  ShellStatus           = SHELL_SUCCESS;
  List                  = NULL;
  Status                = EFI_SUCCESS;

  if ((Node->Info->Attribute & EFI_FILE_READ_ONLY) == EFI_FILE_READ_ONLY) {
    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_RM_LOG_DETELE_RO), gShellLevel2HiiHandle, Node->FullName);
    return (SHELL_ACCESS_DENIED);
  }

  if ((Node->Info->Attribute & EFI_FILE_DIRECTORY) == EFI_FILE_DIRECTORY) {
    if (!IsDirectoryEmpty(Node->Handle)) {
      if (!Quiet) {
        Status = ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_RM_LOG_DELETE_CONF), gShellLevel2HiiHandle, Node->FullName);
        Status = ShellPromptForResponse(ShellPromptResponseTypeYesNo, NULL, (VOID**)&Resp);
        ASSERT_EFI_ERROR(Status);
        ASSERT(Resp != NULL);
        if (EFI_ERROR(Status) || *Resp != ShellPromptResponseYes) {
          SHELL_FREE_NON_NULL(Resp);
          return (SHELL_ABORTED);
        }
        SHELL_FREE_NON_NULL(Resp);
      }
      //
      // empty out the directory
      //
      Status = gEfiShellProtocol->FindFilesInDir(Node->Handle, &List);
      if (EFI_ERROR(Status)) {
        if (List!=NULL) {
          gEfiShellProtocol->FreeFileList(&List);
        }
        return (SHELL_DEVICE_ERROR);
      }
      for (Node2 = (EFI_SHELL_FILE_INFO   *)GetFirstNode(&List->Link)
        ;  !IsNull(&List->Link, &Node2->Link)
        ;  Node2 = (EFI_SHELL_FILE_INFO   *)GetNextNode(&List->Link, &Node2->Link)
       ){
        //
        // skip the directory traversing stuff...
        //
        if (StrCmp(Node2->FileName, L".") == 0 || StrCmp(Node2->FileName, L"..") == 0) {
          continue;
        }
        Node2->Status = gEfiShellProtocol->OpenFileByName (Node2->FullName, &Node2->Handle, EFI_FILE_MODE_READ|EFI_FILE_MODE_WRITE);
        ShellStatus = CascadeDelete(Node2, Quiet);
        if (ShellStatus != SHELL_SUCCESS) {
          if (List!=NULL) {
            gEfiShellProtocol->FreeFileList(&List);
          }
          return (ShellStatus);
        }
      }
      if (List!=NULL) {
        gEfiShellProtocol->FreeFileList(&List);
      }
    }
  }

  if (!(StrCmp(Node->FileName, L".") == 0 || StrCmp(Node->FileName, L"..") == 0)) {
    //
    // now delete the current node...
    //
    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_RM_LOG_DELETE), gShellLevel2HiiHandle, Node->FullName);
    Status = gEfiShellProtocol->DeleteFile(Node->Handle);
    Node->Handle = NULL;
  }

  //
  // We cant allow for the warning here!
  //
  if (Status != EFI_SUCCESS){
    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_RM_LOG_DELETE_ERR), gShellLevel2HiiHandle, Status);
    return (SHELL_ACCESS_DENIED);
  } else {
    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_RM_LOG_DELETE_COMP), gShellLevel2HiiHandle);
    return (SHELL_SUCCESS);
  }
}

BOOLEAN
EFIAPI
IsValidDeleteTarget(
  IN CONST EFI_SHELL_FILE_INFO  *List,
  IN CONST EFI_SHELL_FILE_INFO  *Node,
  IN CONST LIST_ENTRY           *Package
  )
{
  CONST CHAR16        *TempLocation;
  CHAR16              *Temp2;
  UINTN               Size;

  TempLocation = StrStr(Node->FullName, L":");
  if (StrLen(TempLocation) == 2) {
    //
    // Deleting the root directory is invalid.
    //
    return (FALSE);
  }
  TempLocation = ShellGetCurrentDir(NULL);
  Size = 0;
  Temp2 = NULL;
  StrnCatGrow(&Temp2, &Size, TempLocation, 0);
  if (StrStr(Temp2, Node->FullName) != NULL) {
    FreePool(Temp2);
    return (FALSE);
  }
  FreePool(Temp2);

  return (TRUE);
}

/**
  Function for 'rm' command.

  @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
**/
SHELL_STATUS
EFIAPI
ShellCommandRunRm (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS            Status;
  LIST_ENTRY            *Package;
  CHAR16                *ProblemParam;
  CONST CHAR16          *Param;
  SHELL_STATUS          ShellStatus;
  UINTN                 ParamCount;
  EFI_SHELL_FILE_INFO   *FileList;
  EFI_SHELL_FILE_INFO   *Node;

  ProblemParam        = NULL;
  ShellStatus         = SHELL_SUCCESS;
  ParamCount          = 0;
  FileList            = NULL;

  //
  // initialize the shell lib (we must be in non-auto-init...)
  //
  Status = ShellInitialize();
  ASSERT_EFI_ERROR(Status);

  //
  // parse the command line
  //
  Status = ShellCommandLineParse (ParamList, &Package, &ProblemParam, TRUE);
  if (EFI_ERROR(Status)) {
    if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellLevel2HiiHandle, ProblemParam);
      FreePool(ProblemParam);
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else {
      ASSERT(FALSE);
    }
  } else {
    //
    // check for "-?"
    //
    if (ShellCommandLineGetFlag(Package, L"-?")) {
      ASSERT(FALSE);
    }
    if (ShellCommandLineGetRawValue(Package, 1) == NULL) {
      //
      // we insufficient parameters
      //
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellLevel2HiiHandle);
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else {
      //
      // get a list with each file specified by parameters
      // if parameter is a directory then add all the files below it to the list
      //
      for ( ParamCount = 1, Param = ShellCommandLineGetRawValue(Package, ParamCount)
          ; Param != NULL
          ; ParamCount++, Param = ShellCommandLineGetRawValue(Package, ParamCount)
         ){
        Status = ShellOpenFileMetaArg((CHAR16*)Param, EFI_FILE_MODE_WRITE|EFI_FILE_MODE_READ, &FileList);
        if (EFI_ERROR(Status) || FileList == NULL || IsListEmpty(&FileList->Link)) {
          ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_FILE_NF), gShellLevel2HiiHandle, (CHAR16*)Param);
          ShellStatus = SHELL_NOT_FOUND;
          break;
        }
      }

      if (ShellStatus == SHELL_SUCCESS){
        //
        // loop through the list and make sure we are not aborting...
        //
        for ( Node = (EFI_SHELL_FILE_INFO*)GetFirstNode(&FileList->Link)
            ; !IsNull(&FileList->Link, &Node->Link) && !ShellGetExecutionBreakFlag()
            ; Node = (EFI_SHELL_FILE_INFO*)GetNextNode(&FileList->Link, &Node->Link)
           ){
          //
          // skip the directory traversing stuff...
          //
          if (StrCmp(Node->FileName, L".") == 0 || StrCmp(Node->FileName, L"..") == 0) {
            continue;
          }

          //
          // do the deleting of nodes
          //
          if (EFI_ERROR(Node->Status)){
            ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_RM_LOG_DELETE_ERR2), gShellLevel2HiiHandle, Node->Status);
            ShellStatus = SHELL_ACCESS_DENIED;
            break;
          }
          if (!IsValidDeleteTarget(FileList, Node, Package)) {
            ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_RM_LOG_DELETE_ERR3), gShellLevel2HiiHandle, Node->FullName);
            ShellStatus = SHELL_INVALID_PARAMETER;
            break;
          }

          ShellStatus = CascadeDelete(Node, ShellCommandLineGetFlag(Package, L"-q"));
        }
      }
      //
      // Free the fileList
      //
      if (FileList != NULL) {
        Status = ShellCloseFileMetaArg(&FileList);
      }
      FileList = NULL;
    }

    //
    // free the command line package
    //
    ShellCommandLineFreeVarList (Package);
  }

  return (ShellStatus);
}