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ShellPkg: Update CWD and current mapping when commands return 

Some commands may cause current directory or even current mapping
become invalid. For example, "MAP" after unplugging the USB thumb
key may cause current mapping "FS0:" disappear.
This patch updates the CWD and current mapping when commands return.
It also causes the command prompt change to default "Shell>".

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Huajing Li <huajing.li@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by Jaben Carsey <jaben.carsey@intel.com>
This commit is contained in:
Huajing Li 2017-08-28 14:12:33 +08:00 committed by Ruiyu Ni
parent 055fafe1ce
commit f72df3568f
1 changed files with 17 additions and 1 deletions
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18
ShellPkg/Application/Shell/Shell.c
View File

@ -2614,6 +2614,7 @@ RunShellCommand(
CHAR16 *FirstParameter;
CHAR16 *TempWalker;
SHELL_OPERATION_TYPES Type;
CONST CHAR16 *CurDir;
ASSERT(CmdLine != NULL);
if (StrLen(CmdLine) == 0) {
@ -2705,7 +2706,22 @@ RunShellCommand(
ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_SHELL_NOT_FOUND), ShellInfoObject.HiiHandle, FirstParameter);
SetLastError(SHELL_NOT_FOUND);
}
//
// Check whether the current file system still exists. If not exist, we need update "cwd" and gShellCurMapping.
//
CurDir = EfiShellGetCurDir (NULL);
if (CurDir != NULL) {
if (EFI_ERROR(ShellFileExists (CurDir))) {
//
// EfiShellSetCurDir() cannot set current directory to NULL.
// EfiShellSetEnv() is not allowed to set the "cwd" variable.
// Only InternalEfiShellSetEnv () is allowed setting the "cwd" variable.
//
InternalEfiShellSetEnv (L"cwd", NULL, TRUE);
gShellCurMapping = NULL;
}
}
SHELL_FREE_NON_NULL(CleanOriginal);
SHELL_FREE_NON_NULL(FirstParameter);