JGit currently identifies loose objects as 'corrupt' if they've been
deflated using a window size less than 32Kb, because the
isStandardFormat() function doesn't recognise the header
byte as a zlib header. This patch makes the method tolerant of
all valid window sizes (15-bit to 8-bit) - but doesn't sacrifice
it's accuracy in distingushing the standard loose-object format
from the experimental (now abandoned) format. It's based on a patch
which has been merged into C-Git master branch:
https://github.com/git/git/commit/7f684a2aff636f44a506
On memory constrained systems zlib may use a much smaller window
size - working on Agit, I found that Android uses a 4KB window;
giving a header byte of 0x48, not 0x78. Consequently all loose
objects generated by the Android platform appear 'corrupt' :(
It might appear that this patch changes isStandardFormat() to the
point where it could incorrectly identify the experimental format as
the standard one, but the two criteria (bitmask & checksum) can only
give a false result for an experimental object where both of the
following are true:
1) object size is exactly 8 bytes when uncompressed (bitmask)
2) [single-byte in-pack git type&size header] * 256
+ [1st byte of the following zlib header] % 31 = 0 (checksum)
As it happens, for all possible combinations of valid object type
(1-4) and window bits (0-7), the only time when the checksum will be
divisible by 31 is for 0x1838 - ie object type *1*, a Commit - which,
due the fields all Commit objects must contain, could never be as
small as 8 bytes in size.
Given this, the combination of the two criteria (bitmask & checksum)
always correctly determines the buffer format, and is more tolerant
than the previous version.
References:
Android uses a 4KB window for deflation:
http://android.git.kernel.org/?p=platform/libcore.git;a=blob;f=luni/src/main/native/java_util_zip_Deflater.cpp;h=c0b2feff196e63a7b85d97cf9ae5bb2583409c28;hb=refs/heads/gingerbread#l53
Code snippet searching for false positives with the zlib checksum:
https://gist.github.com/1118177
Change-Id: Ifd84cd2bd6b46f087c9984fb4cbd8309f483dec0
Create separate loops based on whether the ref specs
collection is empty or not.
Change-Id: I2861b45fe083675e12ff47f591e104f8cf6dd216
Signed-off-by: Kevin Sawicki <kevin@github.com>
If the ResetCommand should reset to a invalid ref (e.g. HEAD in a repo
whithout a single commit) it was throwing an NPE. This is fixed now by
throwing a JGitInternalExcpeption. It would be nicer if we could throw
a InvalidRefException, but this would modify our API.
Bug: 339610
Change-Id: Iffcb4f2cca9f702176471d93c3a71e5cb3e700b1
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
This implements the server side of shallow clones only (i.e.
git-upload-pack), not the client side.
CQ: 5517
Bug: 301627
Change-Id: Ied5f501f9c8d1fe90ab2ba44fac5fa67ed0035a4
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
This can be useful when implementing garbage collection and there
are packs that should not be copied, such as huge packs that have
a sibling ".keep" file alongside of them.
Callers driving PackWriter need to initialize the list of packs not
to include objects from by passing each index to excludeObjects().
Change-Id: Id7f34df69df97be406bcae184308e92b0e8690fd
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Test was added which reproduce the ClassCastException when ours or
theirs merge strategy is set to MergeCommand. Merger and MergeCommand
were updated in order to avoid exception.
Change-Id: I4c1284b4e80d82638d0677a05e5d38182526d196
Signed-off-by: Denys Digtiar <duemir@gmail.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Adds method into DiffEntry class that allows to specify whether changed
trees are included in scanning result list. By default changed trees
aren't added, but in some cases having changed tree would be useful.
Also adds check for tree count in TreeWalk and when it is different from
two it will thrown an IllegalArgumentException.
This change is required by egit
I7ddb21e7ff54333dd6d7ace3209bbcf83da2b219
Change-Id: I5a680a73e1cffa18ade3402cc86008f46c1da1f1
Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
During parsing these are used with contains(). If they are a List
type, the contains operation is not efficient. Some callers such
as UploadPack often pass a List here, so convert to Set when the
type isn't efficient for contains().
Change-Id: If948ae3bf1f46e756bd2d5db14795e12ba7a6207
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This reverts commit 67b064fc9f.
The "tiny optimization" introduced by 67b0 turns out to have a big
savings on wall-clock time when the object store is very slow (e.g.
the DHT support in JGit), but comes with a much bigger penalty in
space used by the output stream. CGit packed with 67b0 enabled is
7 MiB larger than it should be (36 MiB rather than 28/29 MiB). The
much bigger Linux kernel repository gained over 200 MiB, though some
of this may have been caused by a smaller window setting.
Revert this patch as PackWriter should be optimizing for space used
rather than time spent, since its primary use is network transfer, and
that isn't free.
Change-Id: I7413a9ef89762208159b4a1adc5a22a4c9245611
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The "Counting objects" phase of packing is the most time consuming
part for any server providing access to Git repositories. Scanning
through the entire project history, including every revision of
every tree that has ever existed is expensive and takes an incredible
amount of CPU time.
Inline the tree parsing logic, unroll a number of loops, and setup
to better handle the common case of seeing another occurrence of
an object that was already marked SEEN.
This change boosts the "Counting objects" phase when JGit is acting
as a server and is packing the linux-2.6 repository for its client.
Compared to CGit on the same hardware, a JGit daemon server is now
21883 objects/sec faster:
CGit:
Counted 2058062 objects in 38981 ms at 52796.54 objects/sec
Counted 2058062 objects in 38920 ms at 52879.29 objects/sec
Counted 2058062 objects in 39059 ms at 52691.11 objects/sec
JGit (before):
Counted 2058062 objects in 31529 ms at 65275.21 objects/sec
Counted 2058062 objects in 30359 ms at 67790.84 objects/sec
Counted 2058062 objects in 30033 ms at 68526.69 objects/sec
JGit (this commit):
Counted 2058062 objects in 28726 ms at 71644.57 objects/sec
Counted 2058062 objects in 27652 ms at 74427.24 objects/sec
Counted 2058062 objects in 27528 ms at 74762.50 objects/sec
Above the first run was a "cold server". For JGit the JVM had just
started up with `jgit daemon`, and for CGit we hadn't touched the
repository "recently" (but it was certainly in kernel buffer cache).
The second and third runs were against the running JGit JVM, allowing
timing tests to better reflect the benefits of JGit's pack and index
caching, as well as any optimizations the JIT may have performed.
The timings are fair. CGit is opening, checking and mmap'ing both
the pack and index during the timer. JGit is opening, checking
and malloc+read'ing the pack and index data into its Java heap
during the timer. Both processes are walking the same graph space,
and are computing the "path hash" necessary to sort objects in the
object table for delta compression. Since this commit only impacts
the "Counting objects" phase, delta compression was obviously not
included in the timings and JGit may still be performing delta
compression slower than CGit, resulting in an overall slower server
experience for clients.
Change-Id: Ieb184bfaed8475d6960a494b1f3c870e0382164a
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This is useful when the result needs to be displayed and it's only of
interest if the operation was successful or not (in egit, it could be
used in MultiPullResultDialog).
Change-Id: Icfc9a9c76763f8a777087a1262c8d6ad251a9068
Signed-off-by: Robin Stocker <robin@nibor.org>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
The offset32 format is used for objects <= 2^31-1, while the offset64
format is used for all other objects. This condition was missing
the = needed to ensure an object placed exactly at 2^31 would have
its 64 bit offset in the index.
Change-Id: I293fac0e829c9baa12cb59411dffde666051d6c5
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
A non-thin pack does not need to worry about preferred bases, the pack
will be self-contained and all required delta base objects will appear
within the pack itself. Obtaining the path buffer and length from the
ObjectWalk to build the preferred base table is "expensive", so avoid
the cost unless a thin pack is being constructed.
Change-Id: I16e30cd864f4189d4304e7957a7cd5bdb9e84528
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
* changes:
PackWriter: Skip progress messages on fast operations
IndexPack: Defer the "Resolving deltas" progress meter
IndexPack: Fix "Resolving deltas" progress meter
The previous comment stated that the value set was used
to keep track of the branch in the remote repository
which was incorrect.
Updated the method comment to match the format used
for the PushCommand.setRemote and FetchCommand.setRemote
methods.
Change-Id: I11b81eb3125958af29247b485da56fd88c3bfdf5
Signed-off-by: Kevin Sawicki <kevin@github.com>
If the "Finding sources" phase will complete in <1 second with no
delta compression enabled, don't bother showing the progress meter for
this phase. Small repositories on the local filesystem tend to rip
through this phase always subsecond and the ProgressMonitor display
can actually slow the operation down.
If delta compression is enabled, there are two phases that may run
very quickly. Set the timer to 500 milliseconds instead, reducing the
risk that the user has to wait longer than 1 second before any sort of
output from the packer occurs.
Change-Id: I58110f17e2a5ffa0134f9768b94804d16bbb8399
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If delta resolution completes in < 1000 milliseconds, don't bother
showing the progress meter. This is actually very common for a Gerrit
Code Review server, where the client is probably sending 1 commit and
only a few trees/blobs modified... and the base objects are hot in the
process buffer cache.
The 1000 millisecond delay is just a guess at a reasonable time to wait.
Change-Id: I440baa64ab0dfa21be61deae8dcd3ca061bed8ce
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This progress meter never reached 100% as it did not update while
resolving the external bases in thin packs.
Instead of updating in batches at the top level, update once per delta
that is resolved. The batching progress meter type should smooth out
the frequent updates to an update rate that is more reasonable to send
to the UI, while also ensuring a successful pack parse always reaches
100% deltas resolved.
Change-Id: Ic77dcac542cfa97213a6b0194708f9d3c256d223
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Repository inspection tools may find building a reverse index on a
pack useful, as they can then locate an object by offset. As both
C Git and JGit sometimes produce error messages with the offset
rather than the SHA-1, it may be useful to expose this type.
Change-Id: I487bf32e85a8985cf8ab382d4c82fcbe1fc7da6c
There isn't a good reason to hide all of these as package-private.
Make them public so applications can inspect pack files.
Change-Id: Ia418daf65d63e9e015b8dafdf3d06a1ed91d190b
Some embeddings of UploadPack (e.g. Gerrit Code Review) set their own
PackConfig from a server-wide configuration, overriding any JGit
defaults or settings that may exist at the local repository level.
Make a copy constructor form of PackConfig so this server-wide
configuration object can be copied and then merged with repository
specific configuration data.
Change-Id: I4463c95aeaf7d6536c3ab132dec9c50ee528d9e0
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The cached object databases should not require a close to release
their cached resources. Most object databases just return their
own reference for newCachedDatabase(), so a close() here kills
the real database's internal caches, and possibly underlying files,
resulting in poor performance for the callers of PackParser like
ReceivePack or FetchProcess trying to then go look up objects that
were just parsed, or that current references point to.
Change-Id: Ia4a239093866e5b9faf82744f729fb73f4373f1a
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
A set of ref names like ('a/b' and 'a+b') would cause the RefDirectory
to think that the set of refs have changed because it traversed the
'a' directory in the subtree before looking at 'a+b', but it then
compared with the know refs which are sorted with 'a+b' first.
Fix this by traversing the refs tree in another order. Treat a directory
as if they ends with a '/' before deciding on the order to traverse
the refs tree.
Bug: 348834
Change-Id: I23377f8df00c7252bf27dbcfba5da193c5403917
Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>
Repository.writeMergeCommitMsg(null) no longer fails if the MERGE_MSG
file is missing. This was done to avoid CommitCommand to fail in case of
a missing MERGE_MSG file.
Bug: 352243
Change-Id: Iddf43533d133f8f22199ed6e2393a552670e7d1f
Signed-off-by: Jens Baumgart <jens.baumgart@sap.com>
Reset command should works recursively and allows reset all changed
files in given directory.
Bug: 348524
Change-Id: I441db34f226be36548c61cef77958995971498de
Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Creation of a branch X from an annotated tag, as the starting point,
resulted into .git/refs/heads/X containing the ID of the annotated tag
instead of the ID of the tagged commit.
This fix peels the tag ref before using it as the starting point for
the newly created branch.
Bug: 340836
Change-Id: I01c7325770ecb37f5bf8ddb2a22f802466524f24
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
When trying to clone into a folder that already contains a cloned
repository native git will fail with a message "fatal: destination path
'folder' already exists and is not an empty directory.". Now JGit will
also fail in this situation throwing a JGitInternalException.
The test case was provided by Tomasz Zarna.
Bug: 347852
Change-Id: If9e9919a5f92d13cf038dc470c21ee5967322dac
Also-by: Tomasz Zarna <Tomasz.Zarna@pl.ibm.com>
Signed-off-by: Adrian Goerler <adrian.goerler@sap.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
If no refSpec is explicitly set, the PushCommand should first check the
remote config and then as a fallback use the current behavior.
Change-Id: I2bc648abc517b1d01b2de15d383423ace2081e72
Signed-off-by: Stefan Lay <stefan.lay@sap.com>
DirCacheCheckout did not unlock the index if e.g. an IOException occured
during checkout.
Bug: 350677
Change-Id: Ie9fa09f7a404080da7cdccafb9be3a8c845e4869
Signed-off-by: Jens Baumgart <jens.baumgart@sap.com>
ObjectDirectoryInserter was always creating a temporary file,
writing the complete compressed contents of a tree, fsync()'ing
that to stable storage, and only then checking to see if there
was already an object with the same SHA-1 in the repository.
For commits this strategy makes some sense, the commit is very
unlikely to exist in the repository, as there are embedded times
and these change with each commit.
However for trees coming out of DirCache, it is more common for the
tree to already exist in the repository. Most subdirectories are
not modified in any given commit. Doing all of this local file IO
for things that already exist is very slow.
Try to detect cases where the object is "small enough" that it can
be processed entirely in memory, and avoid doing disk IO entirely
if the object already exists.
Also increase the size of the output buffer for the deflation.
This should boost the average write(2) syscall size from 512 bytes
to 8192 bytes, making streaming of large compressed contents to
disk slightly more efficient.
Change-Id: I1d40364e8725468522435814631916d73174c92b
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
I had the conditions wrong here, causing the in-memory InputStream
to always appear to be at EOF.
Change-Id: I6811d6187a34eaf1fd6c5002550d631decdfc391
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Adds a git-reflog command and associated tests.
Bug: 347859
Change-Id: Iba146ac842cc9ca0be43d3381b4082c9e92bf56f
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
It's useful to have ReflogEntry refactored out so it can be
used by clients via the JGit API.
Change-Id: I03044df9af9f9547777545b7c9b93bdf5f8b7cb5
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
If an internal exception occurs while packing and the request
needs to abort, the HTTP response might already be committed due
to progress message having already been delivered to the client.
This prevents UploadPackServlet from resetting the response and
sending back an HTTP 500 response.
Try to catch all exceptions and report internal errors over the
sideband stream or as an ERR command during the initial ACK/NAK
negotiation phase. This allows JGit to transmit an error message
that the user will receive on their console without needing to
worry about resetting the (already gone) HTTP response.
Change-Id: Ie393fb8bb55d2b79ab1276adf71c781c1807f9fe
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If a fetch or push needs to apply more than a few references
to the local repository it may take more than 0.25 seconds to
process all of the updates. This is especially true in the DHT
storage system during an initial push of a project with many tags.
The backend database may need to use a transaction to ensure each
tag reference creation is unique, and there may be large delays
caused by these transactions.
Change-Id: Ib11a077adfbd525253e425d327f2e2c2380804c7
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
* stable-1.0:
Prepare post JGit v1.0.0.201106090707-r builds
JGit v1.0.0.201106090707-r
Include about.html files in maven build
Prepare post v1.0.0.201106081625-r builds
JGit v1.0.0.201106081625-r
Add missing about.html files to all shipped bundles
Prepare post v1.0.0.201106071701-r builds
JGit v1.0.0.201106071701-r
* stable-1.0:
Prepare post v1.0.0.201106011211-rc3 builds
JGit v1.0.0.201106011211-rc3
Remove incubation marker
blame: Compute the origin of lines in a result file
BlameGenerator digs through history and discovers the origin of each
line of some result file. BlameResult consumes the stream of regions
created by the generator and lays them out in a table for applications
to display alongside of source lines.
Applications may optionally push in the working tree copy of a file
using the push(String, byte[]) method, allowing the application to
receive accurate line annotations for the working tree version. Lines
that are uncommitted (difference between HEAD and working tree) will
show up with the description given by the application as the author,
or "Not Committed Yet" as a default string.
Applications may also run the BlameGenerator in reverse mode using the
reverse(AnyObjectId, AnyObjectId) method instead of push(). When
running in the reverse mode the generator annotates lines by the
commit they are removed in, rather than the commit they were added in.
This allows a user to discover where a line disappeared from when they
are looking at an older revision in the repository. For example:
blame --reverse 16e810b2..master -L 1080, org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/RefDirectoryTest.java
( 1080) }
2302a6d3 (Christian Halstrick 2011-05-20 11:18:20 +0200 1081)
2302a6d3 (Christian Halstrick 2011-05-20 11:18:20 +0200 1082) /**
2302a6d3 (Christian Halstrick 2011-05-20 11:18:20 +0200 1083) * Kick the timestamp of a local file.
Above we learn that line 1080 (a closing curly brace of the prior
method) still exists in branch master, but the Javadoc comment below
it has been removed by Christian Halstrick on May 20th as part of
commit 2302a6d3. This result differs considerably from that of C
Git's blame --reverse feature. JGit tells the reader which commit
performed the delete, while C Git tells the reader the last commit
that still contained the line, leaving it an exercise to the reader
to discover the descendant that performed the removal.
This is still only a basic implementation. Quite notably it is
missing support for the smart block copy/move detection that the C
implementation of `git blame` is well known for. Despite being
incremental, the BlameGenerator can only be run once. After the
generator runs it cannot be reused. A better implementation would
support applications browsing through history efficiently.
In regards to CQ 5110, only a little of the original code survives.
CQ: 5110
Bug: 306161
Change-Id: I84b8ea4838bb7d25f4fcdd540547884704661b8f
Signed-off-by: Kevin Sawicki <kevin@github.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
* stable-1.0:
DHT: Support removing a repository name
DHT: Fix thread-safety issue in AbstractWriteBuffer
jgit.sh: Implement pager support
Change EditList to extend ArrayList
Ensure the HTTP request is fully consumed
Make sure test repositories are closed
Fix CloneCommand not to fetch into remote tracking branches when bare
Update Eclipse IP log for 1.0
Change-Id: I6340d551482e1dda01f82496296d2038b07fa68b
There is no reason for this type to contain an ArrayList and try to
hide the implementation. It only slows down execution by adding an
extra layer of method dispatch to each invocation.
Instead subclass from ArrayList.
Change-Id: Ifbb9c7060c2fe3d5a7397c1aa85fbade14088637
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Some servlet containers require the servlet to read the EOF marker
from the input stream before a response can be output if the stream
is using "Transfer-Encoding: chunked"... which is typical for any
sort of large push to a repository over smart HTTP.
Ensure the EOF is always read by the PackParser when it is handling
the stream, and fail fast if there is more data present than expected
since this does indicate a protocol error.
Also ensure the EOF is read by UploadPack before it starts to output
a partial response using packing progress meters.
Change-Id: I131db9dea20b2324cb7c3272a814f21296bc64bd
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When cloning into a bare repository we should not create remote
tracking branches (e.g refs/remotes/origin/testX). Branches of the
remote repository should but fetched into into branches of the same
name (e.g refs/heads/testX). Also add the noCheckout option which
would prevent checkout after fetch.
Change-Id: I5d4cc0389f3f30c53aa0065f38119af2a1430909
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
RefDirectory was not using FileSnapshot correctly in all places. This
is fixed with this commit. Additionally the constructors for the
different types of refs have been changed to take a FileSnapshot
instead of a modification time.
Change-Id: Ifb6a59e87e8b058a398c38cdfb9d648f0bad4bf8
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
RefData now uses a sequence number as part of the field, ensuring
that updates always increase the sequence number by one whenever
a reference is modified.
Attaching a sequence number to RefData will help with storing
reference log entries during updates. As the sequence number should
be unique within the reference name space, log entries can be keyed
by the sequence number and remain unique. Making this work over
reference delete-create cycles will require an additional RefTable
API to return the oldest sequence number previously used in the
reference log to seed the recreated reference.
Change-Id: I11cfff2a96ef962e57f29925a3eef41bdbf9f9bb
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Adds a class which can be used to calculates a SHA1 of the diff
associated with a patch, similar to git patch-id.
In this version whitespace is not ignored.
Change-Id: I421d15ea905e23df543082786786841cbe3ef10d
Signed-off-by: Stefan Lay <stefan.lay@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
Kevin Sawicki