The referenced bug showed that JGit produced different merge results
compared to C Git. Unit test was added to reproduce the issue. The
problem can be solved by switching to histogram diff algorithm.
Bug: 331078
Change-Id: I54f30afb3a9fef1dbca365ca5f98f4cc846092e3
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Philipp Thun <philipp.thun@sap.com>
The diff algorithm which is used by Merge, Cherry-Pick, Rebase
should be configurable. A new configuration parameter "diff.algorithm"
is introduced which currently accepts the values "myers" or
"histogram". Based on this parameter for example the ResolveMerger
will choose a diff algorithm. The reason for this is bug 331078.
This bug shows that JGit is more compatible with C Git when
histogram diff is in place. But since histogram diff is quite new we
need an easy way to fall back to Myers diff.
Bug: 331078
Change-Id: I2549c992e478d991c61c9508ad826d1a9e539ae3
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Philipp Thun <philipp.thun@sap.com>
Check for deletion of temporary files in .git folder.
Check for deletion and creation of files.
Change-Id: I60b0b2975724f2e3582e8674d9f876dcbf62b350
Signed-off-by: Stefan Lay <stefan.lay@sap.com>
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>
Coverage tests showed that we are missing to test certain areas
in the rebase command. Add the missing tests.
Change-Id: Ia4a272d26cde7e1861dac30496e4b6799fc8187a
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Add the ability to checkout a branch to the working tree.
Bug: 330860
Change-Id: Ie06b9e799a9e1be384da0b8996efa7209b32eac3
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
There was a bug introduced by commit 0e815fe. For non-versioned files
the merge algorithm detected an incoming deletion from THEIRS.
Consequently such files were deleted. That's a severe bug which was
fixed by more precisely detecting incoming deletions.
Change-Id: I4385d3c990db11d62e371a385dc8ee89841db84a
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Philipp Thun <philipp.thun@sap.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
This is a first iteration to implement Rebase. At the moment, this
does not implement --continue and --skip, so if the first
conflict is found, the only option is to --abort the command.
Bug: 328217
Change-Id: I24d60c0214e71e5572955f8261e10a42e9e95298
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
In the case where DirCacheCheckout was used to checkout a tree
without taking HEAD into account (e.g. during a clone or hard reset)
we didn't handle conflicts correctly. E.g. if there are conflicts
(entries with stage != 0) in the index and we tried to hard reset
we have been processing the conflicting pathes multiple times (once
for every stage). With this fix we will update the index with the
entry from the "merge" state (the state we want checkout) when we
detect existing conflicts.
Change-Id: Iffbddccaa588cf0d1460a5e44dabaf540d996e26
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Leaf level notes trees are split into a new fan-out tree if an
insertion occurs and the tree already contains >= 256 notes in it.
The splitting may occur multiple times if all of the notes have the
same prefix; in the worst case this produces a tree path such as
"00/00/00/00/00/00/00/00/00/00/00/00/00/00/00/00/00/00/00/be" if all
of the notes begin with zeros.
Change-Id: I2d7d98f35108def9ec49936ddbdc34b13822a3c7
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This is necessary to allow applications to wrap the note tree in
a commit and update the note branch with the new state.
Change-Id: Idbd7ead4a1b16ae2b64a30a4a01a29cfed548cdf
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
NoteMap now supports editing in-memory, allowing applications to
modify the NoteMap once it has been loaded from the branch. The
ability to write the branch back to tree objects is not yet done,
so the edits are strictly transient.
Change-Id: I63448954abfca2a8e3e95369cd84c0d1176cdb79
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Files bigger than 8 MB (2^23 bytes) tended to overflow the internal
hashtable, as the table was capped in size to 2^17 records. If a
file contained 2^17 unique data blocks/lines, the table insertion
got stuck in an infinite loop as the able couldn't grow, and there
was no open slot for the new item.
Remove the artifical 2^17 table limit and instead allow the table
to grow to be as big as 2^30. With a 64 byte block size, this
permits hashing inputs as large as 64 GB.
If the table reaches 2^30 (or cannot be allocated) hashing is
aborted. RenameDetector no longer tries to break a modify file pair,
and it does not try to match the file for rename or copy detection.
Change-Id: Ibb4d756844f4667e181e24a34a468dc3655863ac
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The NoteMap makes it easy to read a small notes tree as created by
the `git notes` command in C Git. To make the initial implementation
simple a notes tree is read recursively into a map in memory.
This is reasonable if the application will need to access all notes,
or if there are less than 256 notes in the tree, but doesn't behave
well when the number of notes exceeds 256 and the application
doesn't need to access all of them.
We can later add support for lazily loading different subpaths,
thus fixing the large note tree problem described above.
Currently the implementation only supports reading. Writing notes
is more complex because trees need to be expanded or collapsed at
the exact 256 entry cut-off in order to retain the same tree SHA-1
that C Git would use for the same content. It also needs to retain
non-note tree entries such as ".gitignore" or ".gitattribute" files
that might randomly appear within a notes tree. We can also add
writing support later.
Change-Id: I93704bd84ebf650d51de34da3f1577ef0f7a9144
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Test was broken by commit b087bba3 changing formatting of merge
commit messages.
Change-Id: I98b1b936b9b6cbaa50fbc59d243a43e66a6ee9f9
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
We stopped handling URIs such as "example.com:/some/p ath", because
this was confused with the Windows absolute path syntax of "c:/path".
Support absolute style scp URIs again, but only when the host name
is more than 2 characters long.
Change-Id: I9ab049bc9aad2d8d42a78c7ab34fa317a28efc1a
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
IndexDiff was extended to detect files which are both removed from the
index and untracked. Before this change these files were only added
to the removed collection.
Change-Id: I971d8261d2e8932039fce462b59c12e143f79f90
Signed-off-by: Jens Baumgart <jens.baumgart@sap.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
There was a bug in ResolveMerger which is one reason for
bug 328841. If a merge was failing because of conflicts
deletions where not handled correctly. Files which have
to be deleted (because there was a non-conflicting deletion
coming in from THEIRS) are not deleted. In the
non-conflicting case we also forgot to delete the file but
in this case we explicitly checkout in the end these files
get deleted during that checkout.
This is fixed by handling incoming deletions explicitly.
Bug: 328841
Change-Id: I7f4c94ab54138e1b2f3fcdf34fb803d68e209ad0
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
The automatically generated commit message of a merge should have the
same structure as in C Git for consistency (as per git fmt-merge-msg).
Before this change:
merging refs/heads/a into refs/heads/master
After:
Merge branch 'a'
Plurals, "into" and joining by "," and "and" also work.
Change-Id: I9658ce2817adc90d2df1060e8ac508d7bd0571cb
There were also some compiler warning due to empty catch blocks that
were fixed.
Change-Id: I165bcddcdfacd34f020d1b938a41954916eb106e
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>
This mirrors the getByte() API in ObjectId and allows the caller to
modify a single byte, which is useful when updating it as part of a
loop walking through 0x00..0xff inside of a range of objects.
Change-Id: I57fa8420011fe5ed5fc6bfeb26f87a02b3197dab
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Processing git notes requires random access to part of the raw data
of each ObjectId... which isn't easy because ObjectIds are stored
with an internal representation of 5 ints. Expose random access
to the individual data bytes through new methods, avoiding the
need to convert first to a byte[20].
Change-Id: I99e64700b27fc0c95aa14ef8ad46a0e8832d4441
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The JGit merge algorithm or the Merge Command may have problems with handling
deletions always correctly. Therefore one additional test is added to check
this.
Change-Id: Id6aa49136996b29047c340994fe7faba68858e8c
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
JGit merge algorithm behaved differently from C Git when
we had adjacent modifications. If line 9 was modified by
OURS and line 10 by theirs then C Git will return a
conflict while JGit was seeing this as independent
modifications. This change is not only there to achieve
compatibility, but there where also some really wrong
merge results produced by JGit in the area of adjacent
modifications.
Change-Id: I8d77cb59e82638214e45b3cf9ce3a1f1e9b35c70
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Introduced similar helper methods than in AbstractDiffTestCase.
Then the test cases are much smaller and better understandable.
Change-Id: I2beb4db5a93bd8c0c1238d5d3039cbd6719eee90
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
When adding a new method near the end of the sequence we want to
show the full method inserted, and not tear the prior method due
to the common trailing curly brace being consumed as part of the
common end region of the sequences.
Bug: 328895
Change-Id: I233bc40445fb5452863f5fb082bc3097433a8da6
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This test isn't that useful. The better way to evaluate diff
algorithm performance is to run `jgit debug-diff-algorithms` over
real-world repositories, such as linux-2.6.git. Whenever we modify
an algorithm we should manually verify that its runtime performance
doesn't get any worse than it already is.
Change-Id: I0beed3a5a8a537c958a5a6438a1283f97fa2097a
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
HistogramDiff failed on cases where the initial element for the LCS
was actually very common (e.g. has 20 occurrences), and the first
element of the inserted region after the LCS was also common but
had fewer occurrences (e.g. 10), while the LCS also contained a
unique element (1 occurrence).
This happens often in Java source code. The initial element for
the LCS might be the empty line ("\n"), and the inserted but common
element might be "\t/**\n", with the LCS being a large span of
lines that contains unique method declarations. Even though "/**"
occurs less often than the empty line its not a better LCS if the
LCS we already have contains a unique element.
The logic in HistogramDiff would normally have worked fine, except I
tried to optimize scanning of B by making tryLongestCommonSequence
return the end of the region when there are matching elements
found in A. This allows us to skip over the current LCS region,
as it has already been examined, but caused us to fail to identify
an element that had a lower occurrence count within the region.
The solution used here is to trade space-for-time by keeping a
table of A positions to their occurrence counts. This allows the
matching logic to always use the smallest count for this region,
even if the smallest count doesn't appear on the initial element.
The new unit test testEdit_LcsContainsUnique() verifies this new
behavior works as expected.
Bug: 328895
Change-Id: Id170783b891f645b6a8cf6f133c6682b8de40aaf
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
As described in Bug 328551 there was a bug that the merge algorithm
was not always reporting conflicts when the same line was deleted
and modified. This problem was introduced during commit
0c017188b4 when reported conflicts have
been checked for common pre- and suffixes.
This was fixed here by better determining whether after stripping
off common prefixes and suffixes from a conflicting region there
is still some conflicting part left.
I also added a unit test to test this situation.
Bug: 328551
Change-Id: Iec6c9055d00e5049938484a27ab98dda2577afc4
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
When creating a local branch based on another local branch, the
upstream configuration contains "." as origin and the source branch
as "merge". The PullCommand should support this by skipping the
fetch step altogether and use the base branch to merge with.
Change-Id: I260a1771aeeffca5b0161d1494fd63c672ecc2a6
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>
Don't permit transient worker threads to access the underlying output
stream of a ProgressMonitor, as they might get marked as the stream's
writer thread. Instead proxy update events from the workers back onto
the application's real work thread. This ensures that the stream only
sees a single thread, and its the thread that will remain alive for
the entire life cycle of the operation.
This fixes IOException("Write end dead") during local repository fetch
when threaded delta search is enabled. One of the transient delta
search threads became the designated writer for the pipe, and when it
terminated the reader end thought the writer was dead, even though the
main writer thread was still executing in PackWriter.
Bug: 326557
Change-Id: I01d1b20a3d7be1c0b480c7fb5c9773c161fe5c15
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Implemented the initial version of a cherry-pick command.
A correct error handling is missing (what happens if the
checkout fails, the cherry-pick leads to conflicts etc).
But straightforward cherry-picks works.
Change-Id: I235c0eb3a7a2d5bdfe40400f1deed06f29d746e1
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Since the introduction of HashedSequence we no longer need to supply
the RawTextComparator at the time of constructing a RawText. Drop the
definition from the constructor, because it doesn't make sense as part
of our public API.
Change-Id: Iaab34611d60eee4a2036830142b089b2dae81842
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When an empty line was inserted at the beginning of the common end
part of a RawText the comparator incorrectly considered it to be
common, which meant the DiffAlgorithm would later not even have it be
part of the region it examines. This would cause JGit to skip a line
of insertion, which later confused Gerrit Code Review when it tried to
match up the pre and post RawText files for a difference that had this
type of insertion.
Define two new unit tests to check for this insertion of a blank line
condition and correct for it by removing the LF from the common region
when the condition is detected.
Change-Id: I2108570eb2929803b9a56f9fb9c400c758e7156b
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
It wrongly uses the full name of the branch to remove the
configuration entries but must use the shortened one.
Change-Id: Ie386a128a6c6beccc20bafd15c2e36254c5f560d
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>
When creating a branch with CreateBranchCommand.call() without
specifying an explicit startPoint HEAD should be used as startPoint.
There was a bug leading to an NPE in such a case.
Change-Id: Ic0a5dc1f33a0987d66c09996c8012c45785500ff
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
We wanted to wrap all LowLevel JGit excpetions into a
JGitInternalException so that users of this high-level interface
don't have to explicitly catch all of them. This
was forgotten on BranchCreateCommand.call() and I added
it.
Change-Id: Ie140e99574fb004137c66e80fb92eb6c6d0fa5e1
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
HistogramDiff outperforms it for any case where PatienceDiff needs to
fallback to another algorithm. Consequently it's not worth keeping
around, because we would always want a fallback enabled.
Change-Id: I39b99cb1db4b3be74a764dd3d68cd4c9ecd91481
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The need for branching becomes more pressing with pull
support: we need to make sure the upstream configuration entries
are written correctly when creating and renaming branches
(and of course are cleaned up when deleting them).
This adds support for listing, adding, deleting and renaming
branches including the more common options.
Bug: 326938
Change-Id: I00bcc19476e835d6fd78fd188acde64946c1505c
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Application code, including unit tests for storage implementations,
should not extend RevCommit outside of the scope of using it for a
RevWalk. Its a lot of overhead and unlikely to work long-term.
Instead for the one test that matters, use a custom subclass of the
ObjectId type. This lets us measure exactly what we are looking for,
which is that the subclass isn't retained.
A lot of other tests were unnecessarily wrapping an object with a
RevCommit and storing that back into the RefUpdate. This is just
retesting what the earlier no-cache test was doing, and complicated
the test considerably. Drop that code and just rely on the value that
was configured by the helper method.
Change-Id: I5b31813484eaa306e9bc4de9622dd5bd4846b16d
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
In bug 323571 it is mentioned that if you call
'toURI().toURL().toString()' on a java.io.File you cannot pass
that string to jgit as an URIish. Problem is that the passed
URI looks like 'file:/C:/a/b.txt' and that we where expecting
double slashes after scheme':'. This fix adds support for this
single-slash file URLs.
Bug: 323571
Change-Id: I866a76a4fcd0c3b58e0d26a104fc4564e7ba5999
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
This is the minimal implementation of a "Pull" command. It does not
have any parameters besides the generic progress monitor and timeout.
It works on the currently checked-out branch and assumes that the
configuration contains the keys "branch.<branch name>.remote" and
"branch.<branch name>.merge" to determine the remote configuration
for the fetch and the remote branch name for the merge.
Bug: 303404
Change-Id: I7fe09029996d0cfc09a7d8f097b5d6af1488fa93
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
There where quite some bugs regarding wrong URI parsing. In order
to solve them the parsing has to be refactored. We now have
specialized regexps for 'scheme://host/...', scp URIs and local
file names. Now we can detect problems while parsing 'git://host:/abc' which
was previously not possible.
Bug: 315571
Bug: 292897
Bug: 307017
Bug: 323571
Bug: 317388
Change-Id: If72576576ebb6b9d9dc8b7e51ddd87c9909e8b62
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
The regular expression which should handle the
user/password part in an URI was potentially
processing too many chars. This led to problems
when user/pwd and port was specified
Change-Id: I87db02494c4b367283e1d00437b1c06d2c8fdd28
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
URIs for the git protocol have to have a hostname.
(see http://www.kernel.org/pub/software/scm/git/docs
/git-clone.html#_git_urls_a_id_urls_a) Some tests tested
URIs like git:/abc.git which is not allowed. Fixed this.
Change-Id: Ia3b8b681ad6592f03b090a874a6e91068a8301fe
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Projects like org.eclipse.mdt contain large XML files about 6 MiB
in size. So does the Android project platform/frameworks/base.
Doing a clone of either project with JGit takes forever to checkout
the files into the working directory, because delta decompression
tends to be very expensive as we need to constantly reposition the
base stream for each copy instruction. This can be made worse by
a very bad ordering of offsets, possibly due to an XML editor that
doesn't preserve the order of elements in the file very well.
Increasing the threshold to the same limit PackWriter uses when
doing delta compression (50 MiB) permits a default configured
JGit to decompress these XML file objects using the faster
random-access arrays, rather than re-seeking through an inflate
stream, significantly reducing checkout time after a clone.
Since this new limit may be dangerously close to the JVM maximum
heap size, every allocation attempt is now wrapped in a try/catch
so that JGit can degrade by switching to the large object stream
mode when the allocation is refused. It will run slower, but the
operation will still complete.
The large stream mode will run very well for big objects that aren't
delta compressed, and is acceptable for delta compressed objects that
are using only forward referencing copy instructions. Copies using
prior offsets are still going to be horrible, and there is nothing
we can do about it except increase core.streamFileThreshold.
We might in the future want to consider changing the way the delta
generators work in JGit and native C Git to avoid prior offsets once
an object reaches a certain size, even if that causes the delta
instruction stream to be slightly larger. Unfortunately native
C Git won't want to do that until its also able to stream objects
rather than malloc them as contiguous blocks.
Change-Id: Ief7a3896afce15073e80d3691bed90c6a3897307
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Christian Halstrick
Stefan Lay
Chris Aniszczyk
Mathias Kinzler
Shawn O. Pearce
Robin Rosenberg
Matthias Sohn
Jens Baumgart
Robin Stocker