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this is silly but whatever

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

@jbenet

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

@jbenet @whyrusleeping @mappum

very helpful for tracking down errors. the stack traces are only
shown when debug mode is visible. They function best when caught at the
source.

I propose we use this errors package as a drop-in replacement for
fmt.Errorf and errors.New in all of our code, and use errors.Wrap for
external errors as they emerge from others' libraries.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>
Signed-off-by: Brian Tiger Chow <brian.holderchow@gmail.com>

@jbenet

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

@jbenet @whyrusleeping @mappum

If we permit initialization in `ipfs daemon`, then we must ensure that
the node instantiated in `ipfs init` (to create the welcome file) shuts
down and releases resources.

Kept running into "resource temporarily unavailable". Discovered that it
was our cousins Jeff and Sanjay over at LevelDB Ave.

go-datastore doesn't expose Close() so I extended the TsDs interface and
submitted a patch.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>
Signed-off-by: Brian Tiger Chow <brian.holderchow@gmail.com>

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

to aid in testing

This is because if the user specifies that they want
to mount multiple times, something must be wrong. try
unmounting to reset things and then proceed.

This commit adds a Mount abstraction (which is really just
a wrapped context closer). It makes sure to bind the mount
to the fate of the Node (i.e. close it if the node ends).
This fixes #350

@jbenet

ipfs1 docs read:

```
btc λ. ipfs pin
ipfs pin -

Commands:

        add         pin an ipfs object to local storage.
        rm          unpin an ipfs object from local storage.

        Use "pin help <command>" for more information about a command.
```

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>