Matthias Sohn [Fri, 24 Nov 2017 00:18:13 +0000 (01:18 +0100)]
Merge branch 'stable-4.9'
* stable-4.9:
Ignore warning for minor version change without API change
Silence boxing warning
Prepare 4.5.5-SNAPSHOT builds
JGit v4.5.4.201711221230-r
Fix LockFile semantics when running on NFS
Honor trustFolderStats also when reading packed-refs
Prepare 4.5.4-SNAPSHOT builds
JGit v4.5.3.201708160445-r
When running on NFS there was a chance that JGits LockFile
semantic is broken because File#createNewFile() may allow
multiple clients to create the same file in parallel. This
change provides a fix which is only used when the new config
option core.supportsAtomicCreateNewFile is set to false. The
default for this option is true. This option can only be set in the
global or the system config file. The repository config file is not
taken into account in this case.
If the config option core.supportsAtomicCreateNewFile is true
then File#createNewFile() is trusted and the behaviour doesn't
change.
But if core.supportsAtomicCreateNewFile is set to false then after
successful creation of the lock file a hardlink to that lock file is
created and the attribute nlink of the lock file is checked to be 2. If
multiple clients manage to create the same lock file nlink would be
greater than 2 showing the error.
This expensive workaround is described in
https://www.time-travellers.org/shane/papers/NFS_considered_harmful.html
section III.d) "Exclusive File Creation"
Honor trustFolderStats also when reading packed-refs
Then list of packed refs was cached in RefDirectory based on mtime of
the packed-refs file. This may fail on NFS when attributes are cached.
A cached mtime of the packed-refs file could cause JGit to trust the
cached content of this file and to overlook that the file is modified.
Honor the config option trustFolderStats and always read the packed-refs
content if the option is false. By default this option is set to true
and this fix is not active.
Thomas Wolf [Sat, 11 Nov 2017 10:41:10 +0000 (11:41 +0100)]
Yet another work-around for a Jsch bug: timeouts
Jsch 0.1.54 passes on the values from ~/.ssh/config for
"ServerAliveInterval" and "ConnectTimeout" as read from
the config file to java.net.Socket.setSoTimeout(). That
method expects milliseconds, but the values in the config
file are seconds!
The missing conversion in Jsch means that the timeout is
set way too low, and if the server doesn't respond within
that very short time frame, Jsch kills the connection and
then throws an exception with a message such as "session is
down" or "timeout in waiting for rekeying process".
As a work-around, do the conversion to milliseconds in the
Jsch-facing Config interface of OpenSshConfig. That way Jsch
already gets these values as milliseconds.
Bug: 526867
Change-Id: Ibc9b93f7722fffe10f3e770dfe7fdabfb3b97e74 Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
David Pursehouse [Mon, 20 Nov 2017 06:38:43 +0000 (15:38 +0900)]
Merge branch 'stable-4.9'
* stable-4.9:
Fix NPE in TransportGitSsh.ExtSession.exec()
Add missing help text for rev-parse's --verify option
Remove final modifier on args4j argument field in RevParse
Change-Id: I5ac9e2f185f2210ee76970501710b99b12e93e75 Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
So far, in order to get the pack directory it was necessary to resolve
it from the object directory. This resolution is already done when
creating the object directory, so simplify the call by just adding a
getter to the pack directory.
Matthias Sohn [Mon, 13 Nov 2017 21:41:57 +0000 (22:41 +0100)]
Silence invalid @since 3.5 API warning on ResolveMerge#processEntry
This method was removed in 4.9 and reintroduced in
I48ba4308dee73925fa32d6c2fd6b5fd89632c571 as deprecated in 4.9.1 in
order to help EMF Compare to avoid breakage.
Change-Id: Ia638517178313da42ae13ebcf88ad535d9a02723 Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
* changes:
BitmapWalker: do not revisit objects in bitmap
Use bitmaps for non-commit reachability checks
Make PackWriterBitmapWalker public
UploadPackTest: construct commits in test method
Jonathan Tan [Thu, 2 Nov 2017 01:20:54 +0000 (18:20 -0700)]
BitmapWalker: do not revisit objects in bitmap
Currently, BitmapWalker walks through every object returned by the
internal ObjectWalk, regardless of whether that object has already
been marked in the bitmap. Set an object filter to ensure that only
bitmap-unmarked objects are walked through.
Change-Id: I22a8874b1e571df3c33643b365036d95f52fe7c7 Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Jonathan Tan [Thu, 2 Nov 2017 00:36:18 +0000 (17:36 -0700)]
Use bitmaps for non-commit reachability checks
Currently, unless RequestPolicy#ANY is used, UploadPack rejects all
non-commit "want" lines unless they were advertized. This is fine,
except when "uploadpack.allowreachablesha1inwant" is true
(corresponding to RequestPolicy#REACHABLE_COMMIT), in which case one
would expect that "want"-ing anything reachable would work.
(There is no restriction that "want" lines must only contain commits -
it is allowed for refs to directly point to trees and blobs, and
requesting for them using "want" lines works.)
This commit has been written to avoid performance regressions as much
as possible. In the usual (and currently working) case where the only
unadvertized things requested are commits, we do a standard RevWalk in
order to avoid incurring the cost of loading bitmaps. However, if
unadvertized non-commits are requested, bitmaps are used instead, and
if there are no bitmaps, a WantNotValidException is thrown (as is
currently done).
Change-Id: I68ed4abd0e477ff415c696c7544ccaa234df7f99 Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Jonathan Tan [Wed, 25 Oct 2017 21:09:17 +0000 (14:09 -0700)]
Make PackWriterBitmapWalker public
Make PackWriterBitmapWriter class public and move it to a more central
location, in preparation for its use by another class (in a subsequent
commit).
One of its inner static classes, AddUnseenToBitmapFilter, previously
package-private, is also used directly in its former package. Therefore,
AddUnseenToBitmapFilter and its sibling class have been moved to an
internal package instead.
Change-Id: I740bc4bfc4e4e3c857d1ee7d25fe45e90cd22a75 Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Thomas Wolf [Tue, 7 Nov 2017 07:19:56 +0000 (08:19 +0100)]
Work around a Jsch bug: ensure the user name is set from URI
JSch unconditionally overrides the user name given in the connection
URI by the one found in ~/.ssh/config (if that does specify one for
the used host). If the SSH config file has a different user name,
we'll end up using the wrong name, which typically results in an
authentication failure or in Eclipse/EGit asking for a password for
the wrong user.
Unfortunately there is no way to prevent or circumvent this Jsch
behavior up front; it occurs already in the Session constructor at
com.jcraft.jsch.Session() and the Session.applyConfig() method. And
while there is a Session.setUserName() that would enable us to correct
this, that latter method has package visibility only.
So resort to reflection to invoke that setUserName() method to ensure
that Jsch uses the user name from the URI, if there is one.
Bug: 526778
Change-Id: Ia327099b5210a037380b2750a7fd76ff25c41a5a Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
Shawn Pearce [Thu, 9 Nov 2017 17:12:59 +0000 (09:12 -0800)]
Reject pack if delta exceeds array size limit
JGit's delta handling code requires the target to be a single byte
array. Any attempt to inflate a delta larger than fits in the 2GiB
limit will fail with some form of array index exceptions. Check for
this overflow early and abort pack parsing.
Suppress "Unlikely argument type for equals()" warnings in tests
This new warning was introduced in Eclipse 4.7 Oxygen [1].
The only instances of the warning are in test code that is asserting
that some class does not compare equal to Strings. As in the Gerrit
project [2] these asserts are arguably overkill, but arguably also
a reasonable test of an equals implementation. Ignore the warning in
these cases.
Note that if the project is opened in an earlier version of Eclipse,
a warning "Unsupported @SuppressWarnings" will be emitted.
* stable-4.9:
PackInserter: Implement newReader()
Move some strings from DfsText to JGitText
FileRepository: Add pack-based inserter implementation
ObjectDirectory: Factor a method to close open pack handles
ObjectDirectory: Remove last modified check in insertPack
Applications that use ObjectInserters to create lots of individual
objects may prefer to avoid cluttering up the object directory with
loose objects. Add a specialized inserter implementation that produces a
single pack file no matter how many objects. This inserter is loosely
based on the existing DfsInserter implementation, but is simpler since
we don't need to buffer blocks in memory before writing to storage.
An alternative for such applications would be to write out the loose
objects and then repack just those objects later. This operation is not
currently supported with the GC class, which always repacks existing
packs when compacting loose objects. This in turn requires more
CPU-intensive reachability checks and extra I/O to copy objects from old
packs to new packs.
So, the choice was between implementing a new variant of repack, or not
writing loose objects in the first place. The latter approach is likely
less code overall, and avoids unnecessary I/O at runtime.
The current implementation does not yet support newReader() for reading
back objects.
Dave Borowitz [Wed, 1 Nov 2017 14:19:38 +0000 (10:19 -0400)]
ObjectDirectory: Remove last modified check in insertPack
GC explicitly handles the case where a new pack has the same name as an
existing pack due to it containing the exact same set of objects. In
this case, the pack passed to insertPack will have the same name as an
existing pack, but it will also almost certainly have a later mtime than
the existing pack.
The loop in insertPack tried to short-circuit when inserting a new pack,
to avoid walking more of the pack list than necessary. Unfortunately,
this means it will never get to the check for an identical name,
resulting in a duplicate entry for the same PackFile in the pack list.
Remove the short-circuit so that insertPack does not insert a duplicate
entry.
Saša Živkov [Fri, 27 Oct 2017 10:29:52 +0000 (12:29 +0200)]
Move loggers to the top of their class
There is a possibility of hitting NPE on a logger if it is not the first
statically initialized member. For example, if another static
initializer creates an instance of its class and the logger is used
from the constructor.
Matthias Sohn [Tue, 24 Oct 2017 21:13:37 +0000 (23:13 +0200)]
Reintroduce protected method which removal broke EMF Compare
So far we follow OSGi semantic versioning [1] which says the following:
"A change in the second (minor) part of the version signals that the
change is backward compatible with consumers of the API package but not
with the providers of that API. That is, when the API package goes from
version 1.5 to 1.6 it is no longer compatible with a provider of that
API but consumers of that API are backward compatible with that API
package."
The change Ib5fbf17bdaf727bc5d0e106ce88f2620d9f87a6f broke EMF Compare
which subclasses ResolveMerger since we added a new parameter to the
protected ResolveMerger.processEntry() method. According to the above
cited OSGi semantic versioning this is ok, implementers should expect
that they break on minor version changes of the API they implement.
This change reintroduces the old processEntry() method in order to help
avoid breakage for existing EMF Compare versions which expect breakage
also for the implementer case only for major version change (in this
case from JGit 4.x to 5.x).
Han-Wen Nienhuys [Tue, 17 Oct 2017 13:17:34 +0000 (15:17 +0200)]
Throw BinaryBlobException from RawParseUtils#lineMap.
This makes detection of binaries exact for ResolveMerger and
DiffFormatter: they will classify files as binary regardless of where
the '\0' occurs in the text.
This method creates a RawText from a blob, but avoids reading the blob
if the start contains null bytes. This should reduce the amount of
garbage that Gerrit produces for changes with binaries.
Michael Keppler [Thu, 12 Oct 2017 07:38:31 +0000 (09:38 +0200)]
Avoid bad rounding "1 year, 12 months" in date formatter
Round first, then calculate the labels. This avoids "x years, 12 months"
and instead produces "x+1 years".
One test case has been added for the original example the bug was found
with, and one assertion has been moved from an existing test case to the
new test case, since it also triggered the bug.
Bug: 525907
Change-Id: I3270af3850c4fb7bae9123a0a6582f93055c9780 Signed-off-by: Michael Keppler <Michael.Keppler@gmx.de> Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Shawn Pearce [Sat, 12 Aug 2017 21:31:16 +0000 (14:31 -0700)]
dfs: Switch InMemoryRepository to DfsReftableDatabase
This ensure DfsReftableDatabase is tested by the same test suites that
use/test InMemoryRepository. It also simplifies the logic of
InMemoryRepository and brings its compatibility story closer to any
other DFS repository that uses reftables for its reference storage.
Change-Id: I881469fd77ed11a9239b477633510b8c482a19ca Signed-off-by: Minh Thai <mthai@google.com> Signed-off-by: Terry Parker <tparker@google.com>
Shawn Pearce [Sat, 12 Aug 2017 19:19:30 +0000 (12:19 -0700)]
dfs: reftable backed DfsRefDatabase
DfsReftableDatabase is a new alternative for DfsRefDatabase that
handles more operations for the implementor by delegating through
reftables. All reftable files are stored in sibling DfsObjDatabase
using PackExt.REFTABLE and PackSource.INSERT.
Its assumed the DfsObjDatabase periodically runs compactions and GCs
using DfsPackCompactor and DfsGarbageCollector. Those passes are
essential to collapsing the stack of reftables.
Change-Id: Ia03196ff6fd9ae2d0623c3747cfa84357c6d0c79 Signed-off-by: Minh Thai <mthai@google.com> Signed-off-by: Terry Parker <tparker@google.com>
Thomas Wolf [Wed, 18 Oct 2017 20:45:36 +0000 (22:45 +0200)]
Ensure that ~ in ssh config is replaced before Jsch sees it
Do tilde replacement for values from the ssh config file that are
file names in all cases to make sure that they are already replaced
when Jsch tries to get the values.
Previously, OpenSshConfig did tilde replacement only for the
IdentityFile in the JGit-facing "Host" interface and left the
replacement in the Jsch-facing "Config" interface to Jsch.
But on Windows the JGit notion of what should be used to replace the
tilde differs from Jsch's replacement. Jsch always replaces the tilde
by the value of the system property "user.home", whereas JGit also
considers some environment variables like %HOME%. This can lead to
rather surprising failures as in the case of bug 526175 where
%HOME% != user.home.
Prior to commit 9d24470 (i.e.,prior to JGit 4.9.0) this problem never
occurred because Jsch was completely unaware of the ssh config file
and all host and IdentityFile handling happened exclusively in JGit.
Bug: 526175
Change-Id: I1511699664ffea07cb58ed751cfdb79b15e3a99e Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
Shawn Pearce [Sat, 12 Aug 2017 15:25:16 +0000 (08:25 -0700)]
Support symbolic references in ReceiveCommand
Allow creating symbolic references with link, and deleting them or
switching to ObjectId with unlink. How this happens is up to the
individual RefDatabase.
The default implementation detaches RefUpdate if a symbolic reference
is involved, supporting these command instances on RefDirectory.
Unfortunately the packed-refs file does not support storing symrefs,
so atomic transactions involving more than one symref command are
failed early.
Updating InMemoryRepository is deferred until reftable lands, as I
plan to switch InMemoryRepository to use reftable for its internal
storage representation.
Change-Id: Ibcae068b17a2fc6d958f767f402a570ad88d9151 Signed-off-by: Minh Thai <mthai@google.com> Signed-off-by: Terry Parker <tparker@google.com>
Michael Keppler [Thu, 12 Oct 2017 07:38:31 +0000 (09:38 +0200)]
Avoid bad rounding "1 year, 12 months" in date formatter
Round first, then calculate the labels. This avoids "x years, 12 months"
and instead produces "x+1 years".
One test case has been added for the original example the bug was found
with, and one assertion has been moved from an existing test case to the
new test case, since it also triggered the bug.
Bug: 525907
Change-Id: I3270af3850c4fb7bae9123a0a6582f93055c9780 Signed-off-by: Michael Keppler <Michael.Keppler@gmx.de> Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Zhen Chen [Wed, 4 Oct 2017 21:02:24 +0000 (14:02 -0700)]
Use a new RevWalk for validating not advertised wants
Shadow commits in the RevWalk in the UploadPack object may cause the
UNINTERESTING flag not being carried over to their parents commits since
they were marked NO_PARENTS during the assumeShallow or
initializeShallowCommits call.
A new RevWalk needs to be created for this reason, but instead of
creating a new RevWalk from Repository, we can reuse the ObjectReader in
the RevWalk of UploadPack to load objects.
Ned Twigg [Fri, 18 Mar 2016 09:37:58 +0000 (02:37 -0700)]
Checkout now reports failures through exceptions.
Checkout sometimes throws an exception, and
other times it writes an error message to outw
and returns normally, even though the command
failed. This commit now reports all failures
through a die() exception.
Change-Id: I038a5d976d95020fea3faac68e9178f923c25b28 Signed-off-by: Ned Twigg <ned.twigg@diffplug.com>
Dave Borowitz [Wed, 2 Aug 2017 14:39:27 +0000 (10:39 -0400)]
ReflogWriter: Align auto-creation defaults with C git
Per git-config(1), core.logAllRefUpdates auto-creates reflogs for HEAD
and for refs under heads, notes, tags, and for HEAD. Add notes and
remove stash from ReflogWriter#shouldAutoCreateLog. Explicitly force
writing reflogs for refs/stash at call sites, now that this is
supported.
Dave Borowitz [Tue, 1 Aug 2017 12:53:33 +0000 (08:53 -0400)]
Support force writing reflog on a per-update basis
Even if a repository has core.logAllRefUpdates=true, ReflogWriter does
not create reflog files unless the refs are under a hard-coded list of
prefixes, or unless the forceWrite bit is set. Expose the forceWrite bit
on a per-update basis in RefUpdate/BatchRefUpdate/ReceiveCommand,
creating RefLogWriters as necessary.
Dave Borowitz [Tue, 1 Aug 2017 13:43:22 +0000 (09:43 -0400)]
Ensure ReflogWriter only works with a RefDirectory
The ReflogWriter constructor just took a Repository and called
getDirectory() on it to figure out the reflog dirs, but not all
Repository instances use this storage format for reflogs, so it's
incorrect to attempt to use ReflogWriter when there is not a
RefDirectory directly involved. In practice, ReflogWriter was mostly
only used by the implementation of RefDirectory, so enforcing this is
mostly just shuffling around calls in the same internal package.
The one exception is StashDropCommand, which writes to a reflog lock
file directly. This was a reasonable implementation decision, because
there is no general reflog interface in JGit beyond using
(Batch)RefUpdate to write new entries to the reflog. So to implement
"git stash drop <N>", which removes an arbitrary element from the
reflog, it's fair to fall back to the RefDirectory implementation.
Creating and using a more general interface is well beyond the scope of
this change.
That said, the old behavior of writing out the reflog file even if
that's not the reflog format used by the given Repository is clearly
wrong. Fail fast in this case instead.
David Pursehouse [Sat, 30 Sep 2017 09:56:42 +0000 (10:56 +0100)]
ChangeIdUtilTest: Remove unused notestCommitDashV
This test was never being run. Since it was introduced it was
named "notest.." which meant it didn't run with JUnit3, and
since it is not annotated @Test it also doesn't run with JUnit4.
When compiling with Bazel 0.6.0, error-prone raises an error
that the public method is not annotated with @Ignore or @Test.
Given that the test has never been run anyway, we can just
remove it.
Bug: 525415
Change-Id: Ie9a54f89fe42e0c201f547ff54ff1d419ce37864 Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
Thomas Wolf [Tue, 26 Sep 2017 21:54:45 +0000 (23:54 +0200)]
HttpConfig: load user config before reading values from it
Same problem as in commit c227268: openUserConfig() just creates the
FileBasedConfig object, but doesn't read the file yet. An explicit
load() is needed.
As HttpConfig is read-only this omission did not cause any bad effects,
but it simply ignored values from the user config. Most uses of
HttpConfig go through the two-argument constructor, though, where
HttpConfig is given an already loaded repo config.
Change-Id: Ibe7c562c17d6ef37de8b661ab7f6fa0246db01a2 Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
Ned Twigg [Fri, 18 Mar 2016 07:11:04 +0000 (00:11 -0700)]
Added API to TextBuiltin for piped usage.
Added a public method to TextBuiltin which makes it possible for
clients to initialize all of its state, including output and error
streams. This gives clients the ability to customize the way in
which a command is run.
Change-Id: If718236964d2c5cf869e120c74f1a12965f4812e Signed-off-by: Ned Twigg <ned.twigg@diffplug.com>
Thomas Wolf [Sat, 2 Sep 2017 11:20:48 +0000 (13:20 +0200)]
Handle SSL handshake failures in TransportHttp
When a https connection could not be established because the SSL
handshake was unsuccessful, TransportHttp would unconditionally
throw a TransportException.
Other https clients like web browsers or also some SVN clients
handle this more gracefully. If there's a problem with the server
certificate, they inform the user and give him a possibility to
connect to the server all the same.
In git, this would correspond to dynamically setting http.sslVerify
to false for the server.
Implement this using the CredentialsProvider to inform and ask the
user. We offer three choices:
1. skip SSL verification for the current git operation, or
2. skip SSL verification for the server always from now on for
requests originating from the current repository, or
3. always skip SSL verification for the server from now on.
For (1), we just suppress SSL verification for the current instance of
TransportHttp.
For (2), we store a http.<uri>.sslVerify = false setting for the
original URI in the repo config.
For (3), we store the http.<uri>.sslVerify setting in the git user
config.
Adapt the SmartClientSmartServerSslTest such that it uses this
mechanism instead of setting http.sslVerify up front.
Improve SimpleHttpServer to enable setting it up also with HTTPS
support in anticipation of an EGit SWTbot UI test verifying that
cloning via HTTPS from a server that has a certificate that doesn't
validate pops up the correct dialog, and that cloning subsequently
proceeds successfully if the user decides to skip SSL verification.
Bug: 374703
Change-Id: Ie1abada9a3d389ad4d8d52c2d5265d2764e3fb0e Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
Thomas Wolf [Wed, 30 Aug 2017 05:47:26 +0000 (07:47 +0200)]
Support http.<url>.* configs
Git has a rather elaborate mechanism to specify HTTP configuration
options per URL, based on pattern matching the URL against "http"
subsection names.[1] The URLs used for this matching are always the
original URLs; redirected URLs do not participate.
* Scheme and host must match exactly case-insensitively.
* An optional user name must match exactly.
* Ports must match exactly after default ports have been filled in.
* The path of a subsection, if any, must match a segment prefix of
the path of the URL.
* Matches with user name take precedence over equal-length path
matches without, but longer path matches are preferred over
shorter matches with user name.
Implement this for JGit. Factor out the HttpConfig from TransportHttp
and implement the matching and override mechanism.
The set of supported settings is still the same; JGit currently
supports only followRedirects, postBuffer, and sslVerify, plus the
JGit-specific maxRedirects key.
Add tests for path normalization and prefix matching only on segment
separators, and use the new mechanism in SmartClientSmartServerSslTest
to disable sslVerify selectively for only the test server URLs.
Compare also bug 374703 and bug 465492. With this commit it would be
possible to set sslVerify to false for only the git server using a
self-signed certificate instead of having to switch it off globally
via http.sslVerify.
[1] https://git-scm.com/docs/git-config
Change-Id: I42a3c2399cb937cd7884116a2a32fcaa7a418fcb Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
Thomas Wolf [Tue, 5 Sep 2017 09:09:27 +0000 (11:09 +0200)]
Fix missing RefsChangedEvent when packed refs are used
With atomic ref updates using packed refs, JGit did not fire a
RefsChangedEvent. This resulted in a user-visible regression in
EGit: the UI would not update after a "Fetch from upstream...".
Presumably it would also make Gerrit miss out on ref changes?
Strengthen the BatchRefUpdateTest by also asserting the expected
number of RefsChangedEvents, and ensure modCnt is incremented in
RefDirectory.commitPackedRefs() when refs really changed (as opposed
to some internal housekeeping operation, such as packing loose refs).
Bug: 521296
Change-Id: Ia985bda1d99f45a5f89c8020ca4845e7a66e743e Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
Dave Borowitz [Thu, 7 Sep 2017 11:46:25 +0000 (07:46 -0400)]
Add FetchCommand#setRefSpecs(String...) variant
Much of the time the caller can specify a RefSpec succinctly using a
string, and doesn't care about calling setters. Add a convenience method
for this case, and use it where applicable in JGit core.
projects / jgit.git / log