On Mon, Jul 09, 2018 at 07:16:29PM +0200, Quentin Schulz wrote: > While the `env export` can take as parameters variables to be exported, > `env import` does not have such a mechanism of variable selection. > > Let's add the ability to add parameters at the end of the command for > variables to be imported. > > Every env variable from the env to be imported passed by parameter to > this command will override the value of the variable in the current env. > > If a variable exists in the current env but not in the imported env, if > this variable is passed as a parameter to env import, the variable will > be unset ONLY if the -d option is passed to env import, otherwise the > current value of the variable is kept. > > If a variable exists in the imported env, the variable in the current > env will be set to the value of the one from the imported env. > > All the remaining variables are left untouched. > > As the size parameter of env import is positional but optional, let's > add the possibility to use the sentinel '-' for when we don't want to > give the size parameter (when the env is '\0' terminated) but we pass a > list of variables at the end of the command. > > env import addr > env import addr - > env import addr size > env import addr - foo1 foo2 > env import addr size foo1 foo2 > > are all valid. > > env import -c addr > env import -c addr - > env import -c addr - foo1 foo2 > > are all invalid because they don't pass the size parameter required for > checking, while the following are valid. > > env import addr size > env import addr size foo1 foo2 > > Nothing's changed for the other parameters or the overall behaviour. > > One of its use case could be to load a secure environment from the > signed U-Boot binary and load only a handful of variables from an > other, unsecure, environment without completely losing control of > U-Boot. > > Signed-off-by: Quentin Schulz <[email protected]> > Tested-by: Alex Kiernan <[email protected]> > Tested-by: Stephen Warren <[email protected]>
Applied to u-boot/master, thanks! -- Tom
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