To detect if a git url is a gcrypt repo, use: git-remote-gcrypt --check url
Exit status if 0 if the repo exists and can be decrypted, 1 if the repo
-uses gcrypt but could not be decrypted, and 100 if the repo does not
-exist or could not be accessed.
+uses gcrypt but could not be decrypted, and 100 if the repo is not
+encrypted with gcrypt (or could not be accessed).
Note that this has to fetch the repo contents into the local git
repository, the same as is done when using a gcrypt repo.