cmd: env: Add `indirect` to indirectly set values
This allows an ergonomic-enough approximation of ${!variable} expansion.
This could be used the following way:
```
for target in ${boot_targets}; do
env indirect target_name target_name_${target}
# ...
done
```
Assuming `target_name_mmc0` and similar are set appropriately.
A default value can be optionally provided.
Note: this acts on environment variables, not hush variables.
Signed-off-by: Samuel Dionne-Riel <samuel@dionne-riel.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: "Marek Behún" <marek.behun@nic.cz>
[trini: Don't enable by default]
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 7bd9546..c5eb71c 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -518,6 +518,9 @@
If enabled, we are allowed to set/print UEFI variables using
"env" command with "-e" option without knowing details.
+config CMD_NVEDIT_INDIRECT
+ bool "env indirect - Sets environment value from another"
+
config CMD_NVEDIT_INFO
bool "env info - print or evaluate environment information"
help