This allows to verify the expected behavior in
FileSnapshotTest#testSimulatePackfileReplacement and enables extending
FileSnapshot for packfiles to read the packfile's checksum as another
criterion to detect modifications without reading the full content.
Also add another field capturing the result of the last check if
lastModified was racily clean.
Remove unnecessary determination of raciness in the constructor. It was
determined twice in all relevant cases.
Change-Id: I100a2f49d7949693d7b72daa89437e166f1dc107
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
NTFS does not support FileKey hence ignore this test on Windows.
Change-Id: I7b53a591daa5e03eb5e401b5b26d612ab68ce10d
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
testNewFileNoWait() was identical to testNewFileWithWait() but claims it
doesn't wait at all. Hence remove the waits.
Change-Id: I49b8ca5cb49a43c55fe61870c18c42f32fb4b74d
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Due to finite filesystem timestamp resolution the last modified
timestamp of files cannot detect file changes which happened in the
immediate past (less than one filesystem timer tick ago).
Some filesystems expose unique file identifiers, e.g. inodes in Posix
filesystems which are named filekeys in Java's BasicFileAttributes. Use
them as another means to detect file modifications based on stat
information.
Running git gc on a repository yields a new packfile with the same id as
a packfile which existed before the gc if these packfiles contain the
same set of objects. The content of the old and the new packfile might
differ if a different PackConfig was used when writing the packfile.
Considering filekeys in FileSnapshot may help to detect such packfile
modifications.
Bug: 546891
Change-Id: I711a80328c55e1a31171d540880b8e80ec1fe095
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
FileSnapshot.notRacyClean() assumed a worst case filesystem timestamp
resolution of 2.5 sec (FAT has a resolution of 2 sec). Instead measure
timestamp resolution to avoid unnecessary IO caused by false positives
in detecting the racy git problem caused by finite filesystem timestamp
resolution [1].
Cache the measured resolution per FileStore since timestamp resolution
depends on the respective filesystem type. If timestamp resolution
cannot be measured or fails due to an exception fallback to the worst
case FAT timestamp resolution and avoid caching this value.
Add a 10% safety margin in FileSnapshot.notRacyClean(), though running
FsTest.testFsTimestampResolution() 1000 times which is not using a
safety margin didn't fail on Mac using APFS and Java 8, 11, 12.
Measured Java file timestamp resolution: [2]
[1] https://github.com/git/git/blob/master/Documentation/technical/racy-git.txt
[2] https://docs.google.com/spreadsheets/d/1imy0y6WmRqBf0kjCxzxj2X7M50eIVfa7oaUIzEOHmjo
Bug: 546891
Change-Id: I493f3b57b6b306285ffa7d392339d253e5966ab8
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
The "basic" reachability check walks the graph starting from the tips
marking things as "uninteresting". If the target commit is marked as
"uninteresting" it was reached; it is reachable from those tips.
This requires a lot of walking and can be solved directly with bitmaps.
Most of the time the bitmaps are already calculated or a short walk
away.
This should improve the performance of reachability checks, for example
in Gitiles.
Change-Id: I83d33271f58d95d2dc9ed151967b3eda513c99f7
Signed-off-by: Ivan Frade <ifrade@google.com>
To make reachability checks with bitmaps, we need to get the
reachability bitmap of a commit, which is not always precalculated.
There is already a class returning such bitmap (BitmapWalker) but it
does too much unnecessary work: it calculates ALL reachable objects from
a commit (i.e. including trees and blobs), when for reachability the
commits are just enough.
Introduce BitmapCalculator to get the bitmap of a commit: either because
it is precalculated or generating it with a walk only over commits.
Change-Id: Ibb6c78affe9eeaf1fa362a06daf4fd2d91c1caea
Signed-off-by: Ivan Frade <ifrade@google.com>
It is common to check if a certain commit is reachable from some
starting points. For example gitiles does it to check if a commit
is visible to a user based on its permissions.
Offer this functionality in JGit.
Split the interface as the next commit will introduce an implementation
using bitmap indices.
Change-Id: I0933b305c8d734f7a64502910ff4d9ef4fc92ae1
Signed-off-by: Ivan Frade <ifrade@google.com>
Making gitlinks and folders match in a tree walk was the wrong
approach to fix bug 467631. The problem is that in such a conflict
the tree walk may then not descend into the folder.
Revert the changes to Paths.java and PathsTest.java from commit
4678f4b. Instead test for the problem case from bug 467631 explicitly
in IndexDiff. Add Daniel's test case from bug 545162, and add yet
another test case for DiffEntry.scan() that covers the problem
originally reported in bug 545162.
Bug: 545162
Change-Id: Ie2214c5d5ee32ac6596b621f0f1c7b86d38fa9b7
Also-by: Daniel Veihelmann <daniel.veihelmann@gmail.com>
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
If a tree is visited during pack and filtered out with tree:<depth>, we
may need to include it if it is visited again at a lower depth.
Until now we revisit it no matter what the depth is. Now, avoid
visiting it if it has been visited at a lower or equal depth.
Change-Id: I68cc1d08f1999a8336684a05fe16e7ae51898866
Signed-off-by: Matthew DeVore <matvore@gmail.com>
If we are traversing a tree which is too deep, then there is no need to
traverse the children. Skipping children is much faster than traversing
the possibly thousands of objects which are directly or indirectly
referenced by the tree.
Change-Id: I6d68cc1d35da48e3288b9cc80356a281ab36863d
Signed-off-by: Matthew DeVore <matvore@gmail.com>
This is used when fetching, and in particular to populate a partial
clone or a virtual file system cache as the user navigates. With this,
a client can pre-fetch a few directories deeper than only the current
directory.
depth:0 will omit all trees, and is useful if you only want to fetch
the commits of a repository, or fetch just a single tree or blob object.
depth:1 will fetch only the root tree of all commits fetched. depth:2
will fetch the root tree and all blobs and tree objects directly
referenced from it. depth:3 gets one more level, and so on. depth:#
will not filter a blob or tree that is explicitly marked wanted.
Bitmaps are disabled when this filter is used.
This implementation is quite slow because it iterates over all omitted
objects rather than skipping them. This will be addressed in follow-up
commits.
Change-Id: Ic312fee22d60e32cfcad59da56980e90ae2cae6a
Signed-off-by: Matthew DeVore <matvore@gmail.com>
Replace simple uses of Iterator with a corresponding for-loop.
Also add missing braces on loops as necessary.
Change-Id: I708d82acdf194787e3353699c07244c5ac3de189
Signed-off-by: Carsten Hammer <carsten.hammer@t-online.de>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Test that an exception is raised for an invalid group header:
[group "foo" ]
foo = bar
i.e. where there is a space between the group subsection name
and the closing ']'.
Change-Id: I8933ae100b77634b0afb66bb8aa43d24c955799e
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
Do not reload packfiles when their associated filesnapshot is not
modified on disk compared to the one currently stored in memory.
Fix the regression introduced by fef78212 which, in conjunction with
core.trustfolderstats = false, caused any lookup of objects inside
the packlist to loop forever when the object was not found in the pack
list.
Bug: 546190
Change-Id: I38d752ebe47cefc3299740aeba319a2641f19391
Signed-off-by: Luca Milanesio <luca.milanesio@gmail.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Add resolveTipSha1, an inverse of exactRef(String ...), to RefDatabase
and provide a default implementation that runs in O(n) time where n is
the number of refs. For RefTable, provide an implementation that runs
in O(log(n)) time.
[ifrade@google.com: with tests in InMemoryRepositoryTest to exercise
the reftable code path, too]
Change-Id: I2811ccd0339cdc1c74b42cce2ea003f07a2ce9e1
Signed-off-by: Patrick Hiesel <hiesel@google.com>
Signed-off-by: Ivan Frade <ifrade@google.com>
Replace usage with the recommended setFilterSpec(FilterSpec).
Change-Id: Icc528d175f25234eeb2daa6b4c29a67a7a6d1e0a
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
The new references created in the peeling do not receive the update
index. In other words, the update index of a reference (if set) is lost
in the peeling.
Pass-through the update index to the newly created references.
Tested via InMemoryRepository, which uses DfsReftableDatabase.
Change-Id: I7ff7c737a9c3366fdec296a4d9b2e51d10227957
Signed-off-by: Ivan Frade <ifrade@google.com>
This increases type-safety and is ground work for support of the
"tree:<depth>" filter.
Change-Id: Id19eacdcdaddb9132064c642f6d554b1060efe9f
Signed-off-by: Matthew DeVore <matvore@gmail.com>
HashMap<String, Ref> has a memory overhead for refs. Use RefMap.
Change-Id: I3fb4616135dacf687cc3bc2b473effc66ccef5e6
Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>
The prune method did not delete empty fanout directories when loose
objects moved to a new pack file but only when loose unreferenced
objects were pruned.
Change-Id: Ia068f4914c54d9cf9f40b75e8ea50759402b5000
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Due to finite filesystem timestamp resolution the last modified
timestamp of files cannot detect file changes which happened in the
immediate past (less than one filesystem timer tick ago).
Read and consider file size also, so that differing file size can help
to more accurately detect file changes without reading the file content.
Use bulk read to avoid multiple stat calls to retrieve file attributes.
Change-Id: I974288fff78ac78c52245d9218b5639603f67a46
Signed-off-by: Luca Milanesio <luca.milanesio@gmail.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
This isolates the test from the concrete system it's running on.
SshSessionFactory reads the user also through SystemReader.
Change-Id: I1c796aa1c498fe3967456d8589e6be0a82ab8f44
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
With text=auto or core.autocrlf=true, git does not normalize upon
check-in if the file in the index contains already CR/LFs. The
documentation says: "When text is set to "auto", the path is
marked for automatic end-of-line conversion. If Git decides that
the content is text, its line endings are converted to LF on
checkin. When the file has been committed with CRLF, no conversion
is done."[1]
Implement the last bit as in canonical git: check the blob in the
index for CR/LFs. For very large files, we check only the first 8000
bytes, like RawText.isBinary() and AutoLFInputStream do.
In Auto(CR)LFInputStream, ensure that the buffer is filled as much as
possible for the isBinary() check.
Regarding these content checks, there are a number of inconsistencies:
* Canonical git considers files containing lone CRs as binary.
* RawText checks the first 8000 bytes.
* Auto(CR)LFInputStream checks the first 8096 (not 8192!) bytes.
None of these are changed with this commit. It appears that canonical
git will check the whole blob, not just the first 8k bytes. Also
note: the check for CR/LF text won't work with LFS (neither in JGit
nor in git) since the blob data is not run through the smudge filter.
C.f. [2].
Two tests in AddCommandTest actually tested that normalization was
done even if the file was already committed with CR/LF.These tests
had to be adapted. I find the git documentation unclear about the
case where core.autocrlf=input, but from [3] it looks as if this
non-normalization also applies in this case.
Add new tests in CommitCommandTest testing this for the case where
the index entry is for a merge conflict. In this case, canonical git
uses the "ours" version.[4] Do the same.
[1] https://git-scm.com/docs/gitattributes
[2] https://github.com/git/git/blob/3434569fc/convert.c#L225
[3] https://github.com/git/git/blob/3434569fc/convert.c#L529
[4] https://github.com/git/git/blob/f2b6aa98b/read-cache.c#L3281
Bug: 470643
Change-Id: Ie7310539fbe6c737d78b1dcc29e34735d4616b88
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
Deprecate the method in favor of setEncoding(Charset).
Update the only caller in the code base that was still using
the deprecated variant.
Change-Id: I6357f2d0c727007013c72e9d5b7c72a3f5f3f2b1
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
Bug caused the pack to be 12 bytes short when cold cache. Also added
test for copyPackAsIs method.
Change-Id: Idf8fb0e50d1215245d4b032e2e00df4b218c115f
Signed-off-by: Minh Thai <mthai@google.com>
This method tried to iterate spurious files which may exist in the
.git/refs folder, e.g. on Mac a .DS_Store may have been created there by
inspecting the folder using the finder application. This led to a
NotDirectoryException when deleteEmptyRefsFolders tried to create an
iterator for such a file entry. Skip files contained in the refs folder
to ensure the method only tries to iterate contained folders but not
files.
Change-Id: I5f31e733072a35db1e93908a9c69a8891ae5c206
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Single-branch-clone should be able to clone a single tag. Enhance
CloneCommand to accept also full refs of tags in setBranchesToClone().
Make sure we also include fetch ref specs for the fetch command for
tags. This mimics the behavior of native git's single-branch clone:
git clone --branch <tag> --single-branch <URI>
Bug: 542611
Change-Id: I285cf043751d9b0ba71258ee8214c0e5d1191428
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
Several problems:
* The command didn't specify whether it expected short or full names.
* For the new name, it expected a short name, but then got confused
if tags or both local and remote branches with the same name existed.
* For the old name, it accepted either a short or a full name, but
again got confused if a short name was given and a tag with the
same name existed.
With such an interface, one cannot use Repository.findRef() to
reliably find the branch to rename. Use exactRef() for the new
name as by the time the Ref is needed its full name is known.
For determining the old Ref from the name, do the resolution
explicitly: first try exactRef (assuming the old name is a full
name); if that doesn't find anything, try "refs/heads/<old>" and
"refs/remotes/<old>" explicitly. Throw an exception if the name
is ambiguous, or if exactRef returned something that is not a
branch (refs/tags/... or also refs/notes/...).
Document in the javadoc what kind of names are valid, and add tests.
A user can still shoot himself in the foot if he chooses exceptionally
stupid branch names. For instance, it is still possible to rename a
branch to "refs/heads/foo" (full name "refs/heads/refs/heads/foo"),
but it cannot be renamed further using the new short name if a branch
with the full name "refs/heads/foo" exists. Similar edge cases exist
for other dumb branch names, like a branch with the short name
"refs/tags/foo". Renaming using the full name is always possible.
Bug: 542446
Change-Id: I34ac91c80c0a00c79a384d16ce1e727c550d54e9
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
The new API is intended for UIs to check if signing will be possible or
would fail
Bug: 543579
Change-Id: I6ce1fd4210e46d49dcdf420c99d08c93e022136c
Signed-off-by: Gunnar Wagenknecht <gunnar@wagenknecht.org>
BundleFetchConnection.readLine() must abort on EOF, otherwise
it gets stuck in an endless loop.
Bug: 543390
Change-Id: I4cb3428560277888af114b928950d620bb6564f9
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
Except the cases where the warning was suppressed in bf757cd because
they are explicitly testing functionality that is not possible in t-w-r.
Change-Id: I6c66eb31a2314028e09a9213dc695cd163f907e9
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
The tests were written for Java 7 which did not have AutoCloseable
and the try-with-resource concept. When the project was updated to
build with Java 8, the warnings were suppressed.
Remove the suppressions and convert to use try-with-resource.
Change-Id: Ic805bd571c4a2e4376ce5e7c34ca7ac86cbf5104
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
Since 8ed59c5 ("Make TestRepository AutoCloseable", Jan 11, 2019) the
TestRepository class is auto-closeable, but instantiations of it were
not converted to use try-with-resource.
Converting to try-with-resource results, in several cases, in the
repository being closed twice because LocalDiskRepositoryTestCase has
logic to close created repositories in the tearDown method. This results
in several tests emitting a warning to the console:
close() called when useCnt is already zero
Change the default behavior of the createRepository method to not use
the auto-close logic in LocalDiskRepositoryTestCase, so that thy will
instead be closed (only once) using the AutoCloseable implementation.
Deprecate the method that has the autoClose parameter.
Change-Id: I63d62c9913f9b61271667861dae144e551d358c1
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
David Pursehouse
Matthias Sohn
Carsten Hammer
Ivan Frade
Thomas Wolf
Matthew DeVore
Luca Milanesio
Patrick Hiesel
Han-Wen Nienhuys
Masaya Suzuki
Sebastian Schuberth
Minh Thai
Gunnar Wagenknecht