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This changes the pin behavior. It uses the filenames given through
the api, and allows files to be streamed faltly (not a hierarchy),
which is easier for other things (like vinyl in node-ipfs-api land).
Files can also be entirely out of order, and the garbage intermediate
directories will not be pinned (gc-ed later).

The changes also mean the output of add has changed slightly-- it
no longer shows the local path added, but rather the dag path
relative to the added roots. This is a small difference, but changes
tests.

The dagutils.Editor creates a lot of chaff (intermediate objects)
along the way. Wonder how we might minimize the writes to the
datastore...

This commit also removes the "NilRepo()" part of the --only-hash
mode. We need to store at least in an in-mem repo/datastore because
otherwise the dagutils.Editor breaks.

License: MIT
Signed-off-by: Juan Batiz-Benet <juan@benet.ai>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

implement rabin fingerprinting as a chunker for ipfs

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

vendor correctly

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

refactor chunking interface a little

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

work chunking interface changes up into importer

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

move chunker type parsing into its own file in chunk

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

Catch up with core/commands/add.go.

This commit adds a new set of sharness tests for pinning, and addresses
bugs that were pointed out by said tests.

test/sharness: added more pinning tests

Pinning is currently broken. See issue #1051. This commit introduces
a few more pinning tests. These are by no means exhaustive, but
definitely surface the present problems going on. I believe these
tests are correct, but not sure. Pushing them as failing so that
pinning is fixed in this PR.

make pinning and merkledag.Get take contexts

improve 'add' commands usage of pinning

FIXUP: fix 'pin lists look good'

ipfs-pin-stat simple script to help check pinning

This is a simple shell script to help check pinning.

We ought to strive towards making adding commands this easy.
The http api is great and powerful, but our setup right now
gets in the way. Perhaps we can clean up that area.

updated t0081-repo-pinning

- fixed a couple bugs with the tests
- made it a bit clearer (still a lot going on)
- the remaining tests are correct and highlight a problem with
  pinning. Namely, that recursive pinning is buggy. At least:
  towards the end of the test, $HASH_DIR4 and $HASH_FILE4 should
  be pinned indirectly, but they're not. And thus get gc-ed out.
  There may be other problems too.

cc @whyrusleeping

fix grep params for context deadline check

fix bugs in pin and pin tests

check for block local before checking recursive pin

- Modified Godeps/Godeps.json by hand
- [TEST] Updated welcome docs hash to sharness
- [TEST] Updated contact doc
- [TEST] disabled breaking test (t0080-repo refs local)

core/coreunix: Created 'AddWrapped' function to add files with a wrapped directory (to preserve filename in path)

@jbenet wasn't sure about the terminology here. I'm certain what I wrote
is not entirely correct. Feel free to edit.

@whyrusleeping @jbenet does passing this argument effectively instruct
the dagbuilder to pin recursively?