RevCommitListTest: Open Git and RevWalk in try-with-resource

Change-Id: I4ba273a364a12f82a3b3b06ba050bc633411daf6
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

RevCommitParseTest: Open ObjectInserter.Formatter in try-with-resource

Change-Id: Iaa87c51bc19b4fa832393c11db20b69865d30d48
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

RevObjectTest: Open RevWalk in try-with-resource

Change-Id: I19bcbb2f12036c5043436f3d544ccefbb7385b8d
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

RevTagParseTest: Open ObjectInserter.Formatter in try-with-resource

Change-Id: I2341977223be1dc5252492f4775626122f56496b
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

RevertCommandTest: Open Git in try-with-resource

Change-Id: I659adbb0a6f741c4c6f615c8a24b4603c3f6681e
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

SquashMessageFormatterTest: Open git in try-with-resource

Change-Id: Ife94d1f0279ed3671a9bca79fb26c0403549fa17
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

StatusCommandTest: Open Git in try-with-resource

Change-Id: Id13ad9fa3157d0479da12fb8184437be3ca8c948
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

SubmoduleAddTest: Open Git in try-with-resource

Change-Id: I1276ce206e891729adfa681e00952ca0ba6ffc53
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

SymlinksTest: Open git and TreeWalk in try-with-resource

Change-Id: I0fd1933e843375029fa795447b688f23a893f84b
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

T0003_BasicTest: Open autocloseable types in try-with-resource

FileRepository and ObjectInserter.Formatter are autocloseable, so
use try-with-resource for these.

Remove suppression of unused variable warning that is no longer
necessary.

Change-Id: I270829f0a4030083c9599eb5785b0145dc590ed8
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

TextHashFunctions: Fix warnings about variable hiding

The local variables/arguments named 'db' were hiding the member
variable of the same name in the superclass TextBuiltin.

Change-Id: Ic49dcb7cc2a1b3fb46ad78450042c8c8fb464a80
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

TreeFilterTest: Open TreeWalk in try-with-resource

Change-Id: If100a66e544926bcffe9a9a0b31bfd4806902864
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

TreeWalkJava7Test: Open TreeWalk in try-with-resource

Change-Id: I99a483c482b5395653b0d57b368ec1b5fdba450c
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

DirCacheCheckoutTest: Open Git and TreeWalk in try-with-resource

Change-Id: Icc8eda841e6a437e1acf3438525014e7c46d5eb2
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

CommitCommand: Remove declaration of unthrown exception

Change-Id: I1795b1e510ab170f062ee6c5988d7a7567abe260
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Branch: Fix variable hiding warning

The Branch class has a member named 'branch', which was being
hidden by the local variable of the same name used in a for-loop.

Change-Id: I334092010a9c80686fb79713852d4bfa166ce12f
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

ApplyCommandTest: Open Git in try-with-resource

Also, add missing braces around if-block.

Change-Id: I9390b2c7d5c4507923b6f06271a070dc868534e5
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

PackFileTest: Open ObjectInserter.Formatter in try-with-resource

Change-Id: I9c56b5efdb9c13b929073a786092a707fca21281
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

FileTreeIteratorTest: Open Git and RevWalk in try-with-resource

Change-Id: I6e68c4b028e0aa01964eace10307372060371df7
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

RebaseCommandTest: Open RevWalk in try-with-resource

Change-Id: If7b7a90171d1349d634a84f135471ebac29e3210
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

PullCommandTest: Open RevWalk in try-with-resource

Change-Id: I676cd7ef4bb29f980a313acd77506dd070e6c98f
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

BlameGeneratorTest: Create Git instances in try-with-resource

Change-Id: I2dc4191603fbd6c3214763b869882c51b0e53284
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Remove unnecessary suppression of deprecation warnings in tests

Change-Id: I722f8c2e80129e0129349b55a53b29626e2af21c
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

DiffEntryTest: Open Git and TreeWalk in try-with-resource

Change-Id: If4a49268b9b7ec3a44ed1508ed78db365b0c9e5b
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

DiffCommandTest: Open Git and RevWalk in try-with-resource

Change-Id: I966f7e5053651661abc7de63c968e1f5bf2de464
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

CommitCommandTest: Open Git and TreeWalk in try-with-resource

Change-Id: I65a6fd7028e209c300d992c2756100c09ab4dc19
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Merge changes Ifdb33501,Idc7b7bbd,Ia3db8696,I4ef82311,I3ad58d4c, ... into stable-4.2

* changes:
  ConcurrentRepackTest: Don't use deprecated WindowCache.reconfigure
  ConcurrentRepackTest: Open RevWalk in try-with-resource
  CommitOnlyTest: Open RevWalk in try-with-resource
  UnpackedObjectTest: Create ObjectInserter.Formatter in try-with-resource
  FileRepositoryBuilderTest: Use try-with-resource for auto-closeables
  RepositorySetupWorkDirTest: Fix "resource leak" warnings

ConcurrentRepackTest: Don't use deprecated WindowCache.reconfigure

Replace with calls to WindowCacheConfig.install() as mentioned in
WindowCache.reconfigure's deprecation notice.

Change-Id: Ifdb33501a2209239029c815b1e4e844ea5b56075
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

ConcurrentRepackTest: Open RevWalk in try-with-resource

Change-Id: Idc7b7bbdc1df05372b873cbe4c495474f3ffd64b
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

CommitOnlyTest: Open RevWalk in try-with-resource

Change-Id: Ia3db8696f66f8d294e1d443fb54e716d26d517b1
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

UnpackedObjectTest: Create ObjectInserter.Formatter in try-with-resource

The ObjectInserter.Formatter instance is only used to call idFor.

Factor out a utility method to do that.

Change-Id: I4ef823110c2152ac7905681df3217eb8001f5bd9
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

FileRepositoryBuilderTest: Use try-with-resource for auto-closeables

Use try-with-resource to create instances of FileRepository and
FileWriter.

"resource" and "unused" warnings no longer occur, so remove the
suppression annotations.

Change-Id: I3ad58d4cc2d4c019cd8edda7cb401e9d9f3fb790
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

RepositorySetupWorkDirTest: Fix "resource leak" warnings

Use FileRepositoryBuilder to create the Repository, except in cases
where the creation was already in a try-block. Convert those to use
a try-with-resource.

Change-Id: I7d7adeee81bda6e80d91a119c7d690de3d00dc2b
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Remove java7 bundle from Maven central scripts

The bundle org.eclipse.jgit.java7 was deleted in 4.0

Change-Id: I57dbc0b18eaf164c8f53cc2b776ecb80481a993d
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Prepare 4.2.1-SNAPSHOT builds

Change-Id: Ic9eac53b10ac97b2038b334d388ae3d21393f993
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

JGit v4.2.0.201601211800-r

Change-Id: I89f33b0da81ff499315baa5311f95f31724fa510
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Add progress monitor to Merger

Monitoring progress of merges can be useful for users for large
repositories or complex merge processes that take some time.

This enables setting a monitor. Existing merge implementations in jgit
do not yet report progress if a monitor is set. This will be added in a
later change.

Change-Id: I17b978b3fc91750dd88649638b90a46820a0877c
Signed-off-by: Laurent Delaigue <laurent.delaigue@obeo.fr>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Fix TransportException when reading bundle

When reading a bundle file, commit messages who's oneline format is
longer than 982 characters caused JGit to treat subsequent text in
the commit as a SHA, then throw a TransportException because it's
not a valid SHA.

Now the readLine method will read all the way to the end of the
line, not just the first 1024 characters of it.

Change-Id: If15b491aa9a1e4fd9b8bbed2dd9e6be47a64ccb7
Signed-off-by: Chris Gavin <chris@chrisgavin.me>

Fix unused throws CorruptObjectException from addTree

2262a794b48ea removed throws CorruptObjectException, but was not
compiled under Eclipse and did not see errors generated by Eclipse.
Maven build silently ignored the unnecessary code.

Change-Id: I6e9014adcc604588e10e5963d13d0c6ef0e1c617

Merge branch 'master' into stable-4.2

Change-Id: Ieec4f51aedadf5734ae0e3f4e8713248a3c4fc52
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

BundleWriterTest: Open RevWalk in try-with-resource

Change-Id: Ie25770a73b19d6522bad9fdc0966f48370f96265
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

DiffFormatterTest: Remove accidentally added trailing whitespace

Change-Id: Ia7a3b05b79c3a5530a4445e6e48ceae445425224
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

CherryPickCommandTest: Create Git instances in try-with-resource

Change-Id: I9d49258bdf12f3221013c37cfb8a21ea27f28860
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

DiffFormatterTest: Create auto-closeable instances in try-with-resource

Git, ByteArrayOutputStream, and DiffFormatter are auto-closeable and
should be managed in try-with-resource.

Change-Id: I83395116acb4b4f7cd4300fd69564355bc07e4bb
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

ConfigTest: Create Git instance in try-with-resource

Change-Id: Ie65c69e0f1aed95bcdf68ebd68d21b3e2590b41c
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

CommitAndLogCommandTest: Use assumeFalse to skip test on Windows

Use JUnit's assumeFalse method to cause the test to skip when
run on Windows.

Change-Id: I3f59440cfe62c37c127e381052b60471fbe8ec5e
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

CommitAndLogCommandTest: Create Git instances in try-with-resource

Change-Id: Id06417f1d3914cd3addacdbe9b5801a06cc3955f
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

AddCommandTest: Create Git instances in try-with-resource

Change-Id: Idf42f03099eeb9975fef9492ea8a75776afc2a3c
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

ArchiveCommandTest: Create Git instances in try-with-resource

Change-Id: Icbfd92395db85818736142fd3fb3432385e89ca9
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Merge "TreeWalk: Remove CorruptObjectException from addTree(AbstractTreeIterator)"

TreeWalk: Remove CorruptObjectException from addTree(AbstractTreeIterator)

This form of addTree() does not parse any objects and cannot throw the
declared checked exception.  Callers are being forced to try-catch
CorruptObjectException that cannot occur when the iterator instance
has already been constructed.

Change-Id: Id338035302903bab81569d1576eab063eee0885a

Fix ResetCommand to return the resulting ref

ResetCommand was not returning the updated ref as a result of the call()
method. Since the ResetCommand is always updating the same ref (HEAD)
this should always be the HEAD ref.

Bug: 440750
Change-Id: I7974975c3ab05e68c208384e69cf0692ded6e8db
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Add option to allow empty commits to CommitCommand

CommitCommand should allow to specify whether empty commits (commits
having the same tree as the sole predecessor commit) are allowed or not.
Similar to native git's "--allow-empty" flag.

The defaults differ between JGit and native git even after this change.
When not specifying paths then by default JGit allows to create empty
commits while native git does not. It would be API breaking to change
this now.

Bug: 460301
Change-Id: I88feb0c3ffb2c686b1d0594e669729b065cda4cb
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

TagCommandTest: Instantiate Git and RevWalk objects in try-with-resource

Change-Id: I08959650e2970e964bc864dc6d120d7bddfd8232
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

BlameCommandTest: Instantiate Git objects in try-with-resource

Change-Id: Icb9e6bb9ee99589fa2e0388c8b305a8a1f5954db
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

SideBandOutputStreamTest: Use try-with-resource

Factor out the creation of the SideBandOutputStream objects into
a utility method that wraps it in a try-with-resource.

Remove the "unused" suppression that is now unnecessary, and add
declaration that the tests methods can throw Exception.

Change-Id: Iff02e4e3532bd6ab6e423f197e70d44c4f328d0b
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

FileTreeIteratorJava7Test: Create Git instances in try-with-resource

Change-Id: I493e90e8a0d96db5acc49759c8e138b0a8c7b099
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Merge "Remove declared IOException which is no longer thrown"

Remove declared IOException which is no longer thrown

Since 2ccea7f0 ChangeIdUtil.computeChangeId() doesn't throw IOException
anymore.

Change-Id: I0bf43f2346dadbbfe7e6cbcb38b5525456fbf686
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Merge branch 'stable-4.2'

* stable-4.2:
  CheckoutCommandTest: Create Git instances in try-with-resource
  BranchCommandTest: Create Git instances in try-with-resource
  CheckoutTest: Create Git instances in try-with-resource
  BranchTest: Create Git instances in try-with-resource
  URIishTest: Use @Test annotation's `expected` argument
  Suppress "The allocated object is never used" warning in tests
  Add $NON-NLS to suppress "Non-externalized string literal" warnings
  Don't use deprecated constructors of CmdLineException
  Prepare 4.2.0-SNAPSHOT builds
  Remove org.eclipse.jgit.updatesite project from tools/version.sh
  RevParse: Remove superfluous semicolon
  RefUpdateTest: Use try-with-resource for auto-closable types
  RefUpdateTest: Add null check to prevent potential NPE
  CommitCommand: Remove redundant null check
  JGit v4.2.0.201512141825-rc1

Change-Id: I2179859289b2f2e3d0b7c6d02ef7e7890c467f7b
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

ChangeIdUtil: Don't throw IOException

This could have only happened during the getBytes call. Instead, use
Constants.encode, which is a non-throwing implementation.

This change is binary compatible with existing code compiled against
older versions of JGit, although it might break compilation of
previously compiling code due to dead catch blocks.

Change-Id: I191fec5cac718657407230de141440e86d0151fb

Merge "Transport: Implement AutoCloseable"

Transport: Implement AutoCloseable

After creating a Transport instance callers should always call
its close() method. Use AutoCloseable to document this idiom
and allow use of try-with-resources.

Change-Id: I0c6ff3e39ebecdd7a028dbcae1856a818937b186

Merge changes from topic 'deadtree'

* changes:
  Ignore API errors about Tree, TreeEntry, FileTreeEntry and friends being removed
  Revert "Revert "Remove deprecated Tree, TreeEntry, FileTreeEntry and friends""

Merge "ReceiveCommand.abort(): Utility to mark batch of commands as failed"

Ignore API errors about Tree, TreeEntry, FileTreeEntry and friends being
removed

Bug: 486105
Change-Id: I04adcdb68bee7d5f608bb7ab959fe36a890f9ecd

Revert "Revert "Remove deprecated Tree, TreeEntry, FileTreeEntry and
friends""

This reverts commit 2cc80187d3633adedc99eb97132e0a749b457c19.

Bug: 486105
Change-Id: Id4f9987c33d66cbed9de6e4d4d6784afdd01a3cf
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>

CheckoutCommandTest: Create Git instances in try-with-resource

Also rename a local variable in one of the tests that was hiding
a class variable of the same name.

Change-Id: Ia9398157b87a78df6eef0b64a833c16ca2e57ce3
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

BranchCommandTest: Create Git instances in try-with-resource

Also remove a local variable in one of the tests that was
hiding a member variable with the same name.

Change-Id: Ia4d94cdbf2d83d8be2645f0a93d8891d01606c59
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

CheckoutTest: Create Git instances in try-with-resource

Change-Id: I49a03f7bee0b61c062ce160674f9aa0cd1bcc8ba
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

BranchTest: Create Git instances in try-with-resource

Change-Id: I8becee479fab91a18e6daffd6f4fd57338c9d120
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

URIishTest: Use @Test annotation's `expected` argument

Specify the expected exception in the annotation, instead of
catching it and calling `fail()` when it wasn't raised.

Change-Id: I8a640c0e42353533e4e73b85b50c224dc060f2d7
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Suppress "The allocated object is never used" warning in tests

Change-Id: Ibb405e0b36ce5a2cb30268a7de31ab2bd079ad80
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Add $NON-NLS to suppress "Non-externalized string literal" warnings

Change-Id: I3e6f83ad2bc7d493e2c1ab5a8c60affa2b49c386
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Don't use deprecated constructors of CmdLineException

Change-Id: If01fa896537209821d6a7a262ee978572195a397
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Merge "Prepare 4.2.0-SNAPSHOT builds" into stable-4.2

Merge "Remove org.eclipse.jgit.updatesite project from tools/version.sh" into stable-4.2

Annotated to be removed Tree API with @noreference and @noextend

See https://wiki.eclipse.org/Eclipse/API_Central/API_Removal_Process.

Bug: 486105
Change-Id: I460e43da0d487279608729a2081c614e7065f56f
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>

Prepare 4.2.0-SNAPSHOT builds

Change-Id: Ibe38a95bf36db0c0ed948280b28c416943ec0329
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Remove org.eclipse.jgit.updatesite project from tools/version.sh

We don't need to update versions for this project which was removed
a long time ago.

Change-Id: Ie2d030134942add152847581797db3a213ec4c9e
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

ReceiveCommand.abort(): Utility to mark batch of commands as failed

If one or more commands is failing the entire group usually has to
also fail with "transaction aborted". Pull this loop into a helper
so the idiom can be easily reused in several places throughout JGit.

Change-Id: I3b9399b7e26ce2b0dc5f7baa85d585a433b4eaed

Merge "Revert "Remove deprecated Tree, TreeEntry, FileTreeEntry and friends""

Revert "Remove deprecated Tree, TreeEntry, FileTreeEntry and friends"

This reverts commit 0f8743d4d7a4f3af1eccea60d45d51d13f1a2ad4.

JGit is unable to iterate its API.

Change-Id: Ie3d6a28e622a5c0cf54768a2299f1c44c0114c19

RevParse: Remove superfluous semicolon

Change-Id: I5975bc58d7933dafb3e7a8d891e9f6878b98a9a1
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

RefUpdateTest: Use try-with-resource for auto-closable types

Change-Id: I25c8db0e410aa2a4a53dc7d8863e4a6efefcf7cb
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

RefUpdateTest: Add null check to prevent potential NPE

Change-Id: I64b1850c3bb80b09409044461ca3fdde1c46d4bb
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

CommitCommand: Remove redundant null check

Repository.getWorkTree is annotated as @NonNull, so the check
for it returning null is redundant.

Change-Id: I597b0f774ff857b8900519f14a1a17a904cf7c6f
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

Merge "PackWriter: Declare preparePack object sets as @NonNull"

PackWriter: Declare preparePack object sets as @NonNull

Require callers to pass in valid sets for both want and have
collections. Offer PackWriter.NONE as a handy constant for an
empty collection for the have part of preparePack instead of null.

Change-Id: Ifda4450f5e488cbfefd728382b7d30797e229217

Merge "GC: Pack RefTrees in their own pack"

GC: Pack RefTrees in their own pack

The RefTree graph needs to be quickly accessed to read references.
It is also distinct graph disconnected from the rest of the
repository. Store the commit and tree objects in their own pack.

Change-Id: Icbb735be8fa91ccbf0708ca3a219b364e11a6b83

Change to extensions.refsStorage

git-core just rerolled the extensible backends series with refsStorage
as the configuration key. Update JGit to match git-core.

Change-Id: If345a2403a996e358b29cfa2a2298f6e8d59d96b

RefTree: Change peel suffix to " ^" (space carrot)

Using ^{} as the peel suffix has caused problems when projects used
tags like v2.1 and then v2.1.1, v2.2.2, etc.  The peeled value for
v2.1 was stored very far away in the tree relative to v2.1 itself as
^ sorts in the ASCII/UTF-8 encoding after all other common tag
characters like digits and dots.

Use " ^" instead as space is not valid in a reference name, sorts
before all other valid reference characters (thus forcing next entry
locality) and this looks like a peeled marker for the prior tag.

Change-Id: I26d2247a0428dfe26a9c319c02159502b3a67455

FileRepository: Support extensions.refsBackendType = RefTree

This experimental code can be enabled in $GIT_DIR/config:

  [core]
    repositoryformatversion = 1

  [extensions]
    refsBackendType = RefTree

When these are set the repository will read references from the
RefTree rooted by the $GIT_DIR/refs/txn/committed reference.

Update debug-rebuild-ref-tree to rebuild refs/txn/committed only from
the bootstrap layer.  This avoids misuse by rebuilding using packed-refs
and $GIT_DIR/refs tree.

Change-Id: Icf600e4a36b2f7867822a7ab1f1617d73c710a4b

RefTreeDatabase: Ref database using refs/txn/committed

Instead of storing references in the local filesystem rely on the
RefTree rooted at refs/txn/committed.  This avoids needing to store
references in the packed-refs file by keeping all data rooted under
a single refs/txn/committed ref.

Performance to scan all references from a well packed RefTree is very
close to reading the packed-refs file from local disk.

Storing a packed RefTree is smaller due to pack file compression,
about 49.39 bytes/ref (on average) compared to packed-refs using
~65.49 bytes/ref.

Change-Id: I75caa631162dc127a780095066195cbacc746d49

Merge "RevCommit: Better support invalid encoding headers"

RevCommit: Better support invalid encoding headers

With this support we no longer need the 'utf-8' alias. UTF-8 will be
automatically tried when the encoding header is not recognized and used
if the character sequence cleanly decodes as UTF-8.

Modernize some of the references to use StandardCharsets.

Change-Id: I4c0c88750475560e1f2263180c4a98eb8febeca0

Remove deprecated Tree, TreeEntry, FileTreeEntry and friends

These types were deprecated in 0.9.1 (aka 384a19eee07a2f).
If anyone is still using them, its time to stop.

Change-Id: I3f73347ba78c639e0c6a504812bc1a0702f829b1

Paths.pathCompare: Utility to sort paths from byte[]

Consolidate copies of this function into one location.

Add some unit tests to prevent bugs that were accidentally
introduced while trying to make this refactoring.

Change-Id: I82f64bbb8601ca2d8316ca57ae8119df32bb5c08

Add Paths utility class

Simple container for some path related utility functions.

Change-Id: Ice2bec6ad12b1e2cea15988c01aa9dd4e016a849