crippled filesystem support, probing and initial support

git annex init probes for crippled filesystems, and sets direct mode, as
well as `annex.crippledfilesystem`.

Avoid manipulating permissions of files on crippled filesystems.
That would likely cause an exception to be thrown.

Very basic support in Command.Add for cripped filesystems; avoids the lock
down entirely since doing it needs both permissions and hard links.
Will make this better soon.

1 files changed, 9 insertions, 3 deletions

diff --git a/doc/git-annex.mdwn b/doc/git-annex.mdwn
index e55f97fc2..a06ac3802 100644
--- a/doc/git-annex.mdwn
+++ b/doc/git-annex.mdwn
@@ -796,16 +796,22 @@ Here are all the supported configuration settings.
   to close it. On Mac OSX, when not using direct mode this defaults to
   1 second, to work around a bad interaction with software there.
 
+* `annex.autocommit`
+
+  Set to false to prevent the git-annex assistant from automatically
+  committing changes to files in the repository.
+
 * `annex.direct`
 
   Set to true to enable an (experimental) mode where files in the repository
   are accessed directly, rather than through symlinks. Note that many git
   and git-annex commands will not work with such a repository.
 
-* `annex.autocommit`
+* `annex.crippledfilesystem`
 
-  Set to false to prevent the git-annex assistant from automatically
-  committing changes to files in the repository.
+  Set to true if the repository is on a crippled filesystem, such as FAT,
+  which does not support symbolic links, or hard links, or unix permissions.
+  This is automatically probed by "git annex init".
 
 * `remote.<name>.annex-cost`