The merge algorithm was reporting conflicts which where to big.
Example: The common base was "ABC", the "ours" version contained
"AB1C" (the addition of "1" after pos 2) and the "theirs" version also
contained "AB1C". We have two potentially conflicting edits in the
same region which happen to bring in exactly the same content. This
should not be a conflict - but was previously reported as
"AB<<<1===1>>>C".
This is fixed by checking every conflicting chunk whether the
conflicting regions have a common prefix or suffix and by removing
this regions from the conflict.
Change-Id: I4dc169b8ef7a66ec6b307e9a956feef906c9e15e
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Add local changes I missed to push with [1] which broke the JGit
build.
[1] http://egit.eclipse.org/r/#change,1442
Change-Id: I300bfa84c5d8b5128026869b694ef5da7b0d3a4a
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
the merge command should use by default the "resolve" merge strategy.
Change-Id: I6c6973a3397cca12bd8a6bd950d04b1766a08b4c
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
This adds the first merge strategy to JGit which does real
content-merges if necessary. The new merge strategy "resolve" takes as
input three commits: a common base, ours and theirs. It will simply takeover
changes on files which are only touched in ours or theirs. For files
touched in ours and theirs it will try to merge the two contents
knowing taking into account the specified common base.
Rename detection has not been introduced for now.
Change-Id: I49a5ebcdcf4f540f606092c0f1dc66c965dc66ba
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Stefan Lay <stefan.lay@sap.com>
On Mac OS X MyerDiffPerformanceTest was failing since during the
first few tests the JIT compiler is running in parallel slowing down
the tests. When setting the JVM option -Xbatch forcing the JIT to do
its work prior to running the code this effect can be avoided. Instead
we chose to run some tests without recording prior to the recorded
tests since relying on -X JVM parameters isn't portable across JVMs.
Use 10k * powers of 2 as sample size instead of odd numbers used
before and also improve formatting of performance readings.
Bug: 323766
Change-Id: I9a46d73f81a785f399d3cf5a90c8c0516526e048
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Change-Id: Ibc5a302078bfc01d9ee45a4c0ab0b79b2abd185a
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Use 3 different types of LargeObjectException for the 3 major ways
that we can fail to load an object. For each of these use a unique
string translation which describes the root cause better than just
the ObjectId.name() does.
Change-Id: I810c98d5691b74af9fc6cbd46fc9879e35a7bdca
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Currently our algorithm requires that we have the delta base as
a contiguous byte array... but getCachedBytes() might not work
if the object is considered to be large by its underlying loader.
Use the limited form to obtain the object as a byte array instead.
Change-Id: I33f12a8811cb6a4a67396174733f209db8119b42
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This string is part of the network protocol, and isn't meant to
be translated into another language. Clients actually scan for
the string "unpack error " off the wire and react magically to
this information. If it were translated, they would instead have
a protocol exception, which isn't very useful when there is already
an error occurring.
Change-Id: Ia5dc8d36ba65ad2552f683bb637e80b77a7d92f0
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Add an explicit test case to check that we don't
overwrite dirty files in case Head & Index are
equal.
Change-Id: I6266d0a449e55369d2d0a048694dca5565c5fcf3
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
This reverts commit db4c516f67 since
it breaks compatibility with Eclipse 3.5 which can no longer import
the projects
Bug: 323390
Change-Id: I3cc91364a6747cfcb4c611a9be5258f81562f726
Large delta streams are unpacked incrementally, but because a delta
can seek to a random position in the base to perform a copy we may
need to inflate the base repeatedly just to complete one delta.
So work around it by copying the base to a temporary file, and then
we can read from that temporary file using random seeks instead.
Its far more efficient because we now only need to inflate the
base once.
This is still really ugly because we have to dump to a temporary
file, but at least the code can successfully process a large
file without throwing OutOfMemoryError. If speed is an
issue, the user will need to increase the JVM heap and ensure
core.streamFileThreshold is set to a higher value, so we don't use
this code path as often.
Unfortunately we lose the "optimization" of skipping over portions
of a delta base that we don't actually need in the final result.
This is going to cause us to inflate and write to disk useless
regions that were deleted and do not appear in the final result.
We could later improve on our code by trying to flatten delta
instruction streams before we touch the bottom base object, and
then only store the portions of the base we really need for the
final result and that appear out-of-order. Since that is some
pretty complex code I'm punting on it for now and just doing this
simple whole-object buffering.
Because the process umask might be permitting other users to read
files we create, we put the temporary buffers into $GIT_DIR/objects.
We can reasonably assume that if a reader can read our temporary
buffer file in that directory, they can also read the base pack
file we are pulling it from and therefore its not a security breach
to expose the inflated content in a file. This requires a reader
to have write access to the repository, but only if the file is
really big. I'd rather err on the side of caution here and refuse
to read a very big file into /tmp than to possibly expose a secured
content because the Java 5 JVM won't let us create a protected
temporary file that only the current user can access.
Change-Id: I66fb80b08cbcaf0f65f2db0462c546a495a160dd
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
A tag command is added to the Git porcelain API. Tests were
also added to stress test the tag command.
Change-Id: Iab282a918eb51b0e9c55f628a3396ff01c9eb9eb
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Implementation of a checkout (or 'git read-tree') operation which
works together with DirCache. This implementation does similar things
as WorkDirCheckout which main problem is that it works with deprecated
GitIndex. Since GitIndex doesn't support multiple stages of a file
which is required in merge situations this new implementation is
required to enable merge support.
Change-Id: I13f0f23ad60d98e5168118a7e7e7308e066ecf9c
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
The Merger was was only exposing the merge base as an
AbstractTreeIterator. Since we need the merge base as
RevCommit to generate the merge result I expose it here.
Change-Id: Ibe846370a35ac9bdb0c97ce2e36b2287577fbcad
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Otherwise PackFileTest.testDelta_LargeObjectChain() reproducibly
fails with OutOfMemoryError on Mac OS X 10.6.4.
Change-Id: I6a55ff9ba181102606a0d99ffd52392a1615a422
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Updates the project level settings to run the formatter
on save on only on the edited lines.
Change-Id: I26dd69d0c95e6d73f9fdf7031f3c1dbf3becbb79
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
We should use JUnit4 for tests. This patch updates
the MANIFEST.MF and respective launch configurations.
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
PersonIdent should be parsable for an invalid commit which
contains multiple authors, like "A <a@a.org>, B <b@b.org>".
PersonIdent(String) constructor now delegates to
RawParseUtils.parsePersonIdent().
Change-Id: Ie9798d36d9ecfcc0094ca795f5a44b003136eaf7
Because we are using the large stream size, we have to be
above the STREAM_THRESHOLD constant, which I just increased.
Change-Id: I6f10ec8558d9f751d4b547fcae05af94f1c8866b
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Applying deltas in the large streaming mode is horrifically slow.
Trying to pack icu4c is impossible because a single 11 MiB file
sits on top of a 15 MiB file though a 10 deep delta chain, which
results in this very slow inflate process.
Upping the default limit to 15 MiB lets us process this large in a
reasonable time, but its still sufficiently low enough to prevent
exploding the heap of a very large process like Eclipse or Gerrit
Code Review.
We have to revisit the streaming delta application process and do
something much smarter, like flatten the delta chain before we apply
it to the base. But even that is ugly, I've seen a 155 MiB delta
sitting on top of a 450 MiB file to produce a 300 MiB result object.
If the chain is deep, we may have trouble flatting it down.
Change-Id: If5a0dcbf9d14ea683d75546f104b09bb8cd8fdbb
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
We miscomputed the CRC32 checksum for a REF_DELTA type of object, by
not including the full 20 byte ObjectId of the delta base in the CRC
code we use when the delta is too large to go through our two faster
small reuse code paths. This resulted in a corruption error during
packing, where the PackFile erroneously suspected the data was wrong
on the local filesystem and aborted writing, because the CRC didn't
match what we had read from the index.
Change-Id: I7d12cdaeaf2c83ddc11223ce0108d9bd6886e025
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
We didn't fully cover what we support and what we don't. It was
also a bit hard to follow the syntaxes supported. Clean that up
by documenting it.
Change-Id: I7b96fa6cbefcc2364a51f336712ad361ae42df2d
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
We can now resolve expressions that reference a path within a
commit, designating a specific revision of a specific tree or
file in the project.
Change-Id: Ie6a8be629d264d72209db894bd680c5900035cc0
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
We now match on the -gABBREV style output created by git describe
when its describing a non-tagged commit, and resolve that back to
the full ObjectId using the abbreviation resolution feature that
we already support.
Change-Id: Ib3033f9483d9e1c66c8bb721ff48d4485bcdaef1
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Calling it by the old numerical numbering system makes it really
hard to find the test that tests Repository.resolve(String).
Change-Id: I92d0ecbc8d66ce21bfed08888eeedf1300ffa594
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Its wrong to return null if we are resolving an abbreviation and we
have proven it matches more than one object. We know how to resolve
it if we had more nybbles, as there are two or more objects with the
same prefix. Declare that to the caller quite clearly by giving them
an AmbiguousObjectException.
Change-Id: I01bb48e587e6d001b93da8575c2c81af3eda5a32
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If we are given a DiffEntry header that already has abbreviated
ObjectIds on it, we may still be able to resolve those locally and
output the difference. Try to do that through the new resolve API
on ObjectReader.
Change-Id: I0766aa5444b7b8fff73620290f8c9f54adc0be96
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Parsing is rewritten to use the size limited form of getCachedBytes,
thus freeing the revwalk infrastructure from needing to care about
a large object vs. a small object when it gets an ObjectLoader.
Right now we hardcode our upper bound for a commit or annotated
tag to be 15 MiB. I don't know of any that is more than 1 MiB in
the wild, so going 15x that should give us some reasonable headroom.
Change-Id: If296c211d8b257d76e44908504e71dd9ba70ffa8
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Rather than duplicating this block everywhere, reuse the limited size
form of getCachedBytes to acquire the content of an object.
Change-Id: I2e26a823e6fd0964d8f8dbfaa0fc2e8834c179c1
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Some algorithms are coded in a way that requires us to provide them
the entire object contents as a contiguous byte array. The parsers
in RevCommit and RevTag, or our RawText objects are really good
examples of these.
Instead of duplicating this logic everywhere, lets put it into the
base ObjectLoader type. That way the caller only needs to give us
their upper size bound, and we'll do the rest of the heavy work to
figure out if the object still fits within that bound, and get them
an array that has the complete contents.
Change-Id: Id95a7f79d2b97e39f6949370ccca2f2c9cfb1a0f
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
A chunk of code that throws LargeObjectException may or may not have
the specific ObjectId on hand when its thrown. If it does, we want
to cache it in the exception, and put that in the message. If it is
missing we want to be able to set it later from a higher level stack
frame that does have the object handy.
Change-Id: Ife25546158868bdfa886037e4493ef8235ebe4b9
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
If the loader's stream is broken and returns to us more content
than it originally declared as the size of the object, don't
copy that onto the output stream. Instead throw EOFException
and abort fast. This way we don't follow an infinite stream,
but instead will at least stop when the size was reached.
Change-Id: I7ec0c470c875f03b1f12a74a9b4d2f6e73b659bb
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If the stream is a delta decompression stream, getting the size
can be expensive. Its cheaper to get it from the stream itself
rather than from the object loader.
Change-Id: Ia7f0af98681f6d56ea419a48c6fa8eea09274b28
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If we can't resolve an abbreviation, it might be because there is
a new pack file we haven't picked up yet. Try scanning the packs
again and recheck each pack if there were differences from the last
scan we did.
Because of this, we don't have to open a pack during the test where
we generate a pack on the fly. We'll miss on the first loop during
which the PackList is the NO_PACKS magic initialization constant,
and pick up the newly created index during this retry logic.
Change-Id: I7b97efb29a695ee60c90818be380f7ea23ad13a3
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
ObjectReader implementations are now responsible for creating the
unique abbreviation of an ObjectId, or for resolving an abbreviation
back to its full form. In this latter case the reader can offer up
multiple candidates to the caller, who may be able to disambiguate
them based on context.
Repository.resolve() doesn't take multiple candidates into account
right now, but it could in the future by looking for a remaining
^0 or ^{commit} suffix and take an expansion if there is only one
commit that matches the input abbreviation. It could also use
the distance from an annotated tag to resolve "tag-NNN-gcommit"
style strings that are often output by `git describe`.
Change-Id: Icd3250adc8177ae05278b858933afdca0cbbdb56
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
ObjectWriter is a deprecated API that people shouldn't be using.
So get rid of it in favor of the ObjectInserter API.
Change-Id: I6218bcb26b6b9ffb64e3e470dba5dca2e0a62fd4
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Shawn O. Pearce
Marc Strapetz
Chris Aniszczyk
Christian Halstrick
Matthias Sohn
Robin Rosenberg
Benjamin Muskalla