Changes

Update Orbit to the Oxygen version R20170516192513

Change-Id: I13575c77540149d383747a34754ac338ed60fb52
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Run auto GC in the background

When running an automatic GC on a FileRepository, when the caller
passes a NullProgressMonitor, run the GC in a background thread. Use a
thread pool of size 1 to limit the number of background threads spawned
for background gc in the same application. In the next minor release we
can make the thread pool configurable.

In some cases, the auto GC limit is lower than the true number of
unreachable loose objects, so auto GC will run after every (e.g) fetch
operation.  This leads to the appearance of poor fetch performance.
Since these GCs will never make progress (until either the objects
become referenced, or the two week timeout expires), blocking on them
simply reduces throughput.

In the event that an auto GC would make progress, it's still OK if it
runs in the background. The progress will still happen.

This matches the behavior of regular git.

Git (and now jgit) uses the lock file for gc.log to prevent simultaneous
runs of background gc. Further, it writes errors to gc.log, and won't
run background gc if that file is present and recent. If gc.log is too
old (according to the config gc.logexpiry), it will be ignored.

Change-Id: I3870cadb4a0a6763feff252e6eaef99f4aa8d0df
Signed-off-by: David Turner <dturner@twosigma.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

ArchiveCommand: Create prefix entry with commit time

The cgit archive command creates a prefix (root) directory entry
in the archive file. That entry's time is set to the commit time.

This patch makes jgit's behavior consistent with with cgit:

prefix: hoge/     -> creates prefix directory "hoge/" entry.
prefix: hoge////  -> creates prefix directory "hoge/" entry.
prefix: hoge/foo  -> does not create prefix directory entry, but for
                     each file/directory entry, prefix is added.

Change-Id: I2610e40ce37972c5f7456fdca6337e7fb07176e5
Signed-off-by: Yasuhiro Takagi <ytakagi@bea.hi-ho.ne.jp>

JGit v4.7.1.201706071930-r

Change-Id: I28cd8fbe995d76c8a00e7db6ddf826e983d89043
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Prepare 4.7.2-SNAPSHOT builds

Change-Id: I7c127bd402cd84c68d8f33a32c6aad093a2264c8
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

CloneCommand#setCallback should return 'this'

The other methods in this class follow the builder pattern, and
return 'this', allowing multiple method calls to be chained in a
single statement.

Update the setCallback method to do the same.

Change-Id: I0366d28bf66ba47f08ee7eee636d613c9fe079f5
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

SubmoduleUpdateCommand#setCallback should return 'this'

The other methods in this class follow the builder pattern, and
return 'this', allowing multiple method calls to be chained in a
single statement.

Update the setCallback method to do the same.
Change-Id: I4ddaacd6d50601f47f61eb6be8b62c8d59cce062
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Fix capitalization of command help summaries

Change-Id: Ibb245fdca5470efa6340af019b452dd17b01e9c2
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

Fetch: Add --recurse-submodules and --no-recurse-submodules options

Add options to control recursion into submodules on fetch.

Add a callback interface on FetchCommand, to allow Fetch to display
an update "Fetching submodule XYZ" for each submodule.

Change-Id: Id805044b57289ee0f384b434aba1dbd2fd317e5b
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Allow to use an external ExecutorService for background auto-gc

If set use the external executor, otherwise use JGit's own simple
WorkQueue. Move WorkQueue to an internal package so we can reuse it
without exposing it in the public API.

Change-Id: I060d62ffd6692362a88b4bf13ee07b0dc857abe9
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Use a dedicated executor to run auto-gc in command line interface

WorkQueue uses daemon threads so auto-gc would not be executed after
short-lived commands run in command line. Hence use a dedicated executor
which we shutdown when the command finishes.

Change-Id: I0c2429ecfa04387389d159168ba78a020a696228
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>