using master key from usb

[Damien Goutte-Gattat]

On 03/19/2016 01:24 PM, Me Self wrote:
> I can use the master key with:
> gpg --homedir /media/myusb/gnupg ...
>
> Now I want to --sign-keys a key that is imported in the keyring on the
> harddrive.

You can use the --keyring option to add your normal public keyring 
(containing the key you want to sign):

   $ gpg --homedir /media/myusb/gnupg --keyring ~/.gnupg/pubring.gpg ...


> Is there an easier way to use the master key?

If you’re using GnuPG 2.1, an easy and (IMHO) elegant way is to create a 
symlink pointing to your master key on the USB stick:

   $ ln -s /media/myusb/gnupg/private-keys-v1.d/XXXXXXX.key 
~/.gnupg/private-keys-v1.d/XXXXXX.key

(where XXXXXX is the *keygrip* of your master key, which you can learn 
with the --with-keygrip option when listing keys).

You can then call gpg as usual, without needing to change its home 
directory. When you are done, just remove the symlink and unmount your 
USB stick.

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