From: Jim.Dailey@dell.com <Jim.Dailey@dell.com>
Date: Wed, 3 Oct 2018 16:02:24 +0000 (-0700)
Subject: ShellPkg: Create a homefilesystem environment variable
X-Git-Tag: edk2-stable201903~896
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=c0b1f749ef1304810ed4ea58ded65b7f41d79d3e;hp=c526dcd40f3a0f3a091684481f9c85f03f6a70a7;p=mirror_edk2.git

ShellPkg: Create a homefilesystem environment variable

Create a homefilesystem environment variable whose value is the file
system on which the executing shell is located. For example: "FS14:".

This eliminates the need for people to have to try and find the "boot"
file system in their startup script.  After this change they can simply
execute %homefilesystem% to set the cwd to the root of the file system
where the shell is located.

A future enhancement could be to add "homefilesystem" to the list of
predefined, read-only variables listed in the EfiShellSetEnv function of
file ShellProtocol.c

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jim Dailey <jim_dailey@dell.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
---

diff --git a/ShellPkg/Application/Shell/Shell.c b/ShellPkg/Application/Shell/Shell.c
index 3f3bcbb4b0..6185b6ac80 100644
--- a/ShellPkg/Application/Shell/Shell.c
+++ b/ShellPkg/Application/Shell/Shell.c
@@ -1169,6 +1169,8 @@ LocateStartupScript (
       *TempSpot = CHAR_NULL;
     }
 
+    InternalEfiShellSetEnv(L"homefilesystem", StartupScriptPath, TRUE);
+
     StartupScriptPath = StrnCatGrow (&StartupScriptPath, &Size, ((FILEPATH_DEVICE_PATH *)FileDevicePath)->PathName, 0);
     PathRemoveLastItem (StartupScriptPath);
     StartupScriptPath = StrnCatGrow (&StartupScriptPath, &Size, mStartupScript, 0);