From: Lars Schneider <larsxschnei...@gmail.com> Perforce repositories can contain large (binary) files. Migrating these repositories to Git generates very large local clones. External storage systems such as Git LFS [1], Git Fat [2], or Git Media [2] try to address this problem.
Add a generic mechanism to detect large files based on extension, uncompressed size, and/or compressed size. [1] https://git-lfs.github.com/ [2] https://github.com/jedbrown/git-fat [3] https://github.com/alebedev/git-media Signed-off-by: Lars Schneider <larsxschnei...@gmail.com> --- Documentation/git-p4.txt | 26 ++++++++ git-p4.py | 150 ++++++++++++++++++++++++++++++++++++++++++--- t/t9823-git-p4-mock-lfs.sh | 106 ++++++++++++++++++++++++++++++++ 3 files changed, 273 insertions(+), 9 deletions(-) create mode 100755 t/t9823-git-p4-mock-lfs.sh diff --git a/Documentation/git-p4.txt b/Documentation/git-p4.txt index 82aa5d6..e0d0239 100644 --- a/Documentation/git-p4.txt +++ b/Documentation/git-p4.txt @@ -510,6 +510,32 @@ git-p4.useClientSpec:: option '--use-client-spec'. See the "CLIENT SPEC" section above. This variable is a boolean, not the name of a p4 client. +git-p4.largeFileSystem:: + Specify the system that is used used for large (binary) files. + Please note that most of these large file systems depend on the + Git clean/smudge filters. These filters are not applied through + git-p4. You need to create a fresh clone of the repository after + running git-p4. + +git-p4.largeFileExtensions:: + All files matching a file extension in the list will be processed + by the large file system. Do not prefix the extensions with '.'. + +git-p4.largeFileThreshold:: + All files with an uncompressed size exceeding the threshold will be + processed by the large file system. By default the threshold is + defined in bytes. Add the suffix k, m, or g to change the unit. + +git-p4.largeFileCompressedThreshold:: + All files with a compressed size exceeding the threshold will be + processed by the large file system. This option might significantly + slow down your clone/sync process. By default the threshold is + defined in bytes. Add the suffix k, m, or g to change the unit. + +git-p4.pushLargeFiles:: + Boolean variable which defines if large files are automatically + pushed to a server. + Submit variables ~~~~~~~~~~~~~~~~ git-p4.detectRenames:: diff --git a/git-p4.py b/git-p4.py index 90d3b90..ada4174 100755 --- a/git-p4.py +++ b/git-p4.py @@ -22,6 +22,8 @@ import platform import re import shutil import stat +import zipfile +import zlib try: from subprocess import CalledProcessError @@ -922,6 +924,50 @@ def wildcard_present(path): m = re.search("[*#@%]", path) return m is not None +def largeFileSystem(): + try: + largeFileSystem = getattr(sys.modules[__name__], gitConfig('git-p4.largeFileSystem')) + assert(hasattr(largeFileSystem, "attributeDescription")) + assert(hasattr(largeFileSystem, "attributeFilter")) + assert(hasattr(largeFileSystem, "generatePointer")) + assert(hasattr(largeFileSystem, "pushFile")) + return largeFileSystem + except AttributeError as e: + die('Large file system not supported: %s' % gitConfig('git-p4.largeFileSystem')) + +class MockLFS: + """Mock large file system for testing.""" + + @staticmethod + def attributeDescription(): + return 'Mock LFS' + + @staticmethod + def attributeFilter(): + return 'mock' + + @staticmethod + def generatePointer(cloneDestination, contentFile): + """The pointer content is the original content prefixed with "pointer-". + The local filename of the large file storage is derived from the file content. + """ + with open(contentFile, 'r') as f: + content = next(f) + gitMode = '100644' + pointerContents = 'pointer-' + content + localLargeFile = os.path.join(cloneDestination, '.git', 'mock-storage', 'local', content[:-1]) + return (gitMode, pointerContents, localLargeFile) + + @staticmethod + def pushFile(localLargeFile): + """The remote filename of the large file storage is the same as the local + one but in a different directory. + """ + remotePath = os.path.join(os.path.dirname(localLargeFile), '..', 'remote') + if not os.path.exists(remotePath): + os.makedirs(remotePath) + shutil.copyfile(localLargeFile, os.path.join(remotePath, os.path.basename(localLargeFile))) + class Command: def __init__(self): self.usage = "usage: %prog [options]" @@ -2038,6 +2084,7 @@ class P4Sync(Command, P4UserMap): self.clientSpecDirs = None self.tempBranches = [] self.tempBranchLocation = "git-p4-tmp" + self.largeFiles = set() if gitConfig("git-p4.syncFromOrigin") == "false": self.syncWithOrigin = False @@ -2158,6 +2205,88 @@ class P4Sync(Command, P4UserMap): return branches + def writeToGitStream(self, gitMode, relPath, contents): + self.gitStream.write('M %s inline %s\n' % (gitMode, relPath)) + self.gitStream.write('data %d\n' % sum(len(d) for d in contents)) + for d in contents: + self.gitStream.write(d) + self.gitStream.write('\n') + + def writeGitAttributesToStream(self): + self.writeToGitStream( + '100644', + '.gitattributes', + [ + '\n', + '#\n', + '# %s\n' % largeFileSystem().attributeDescription(), + '#\n', + ] + + ['*.' + f.replace(' ', '[:space:]') + ' filter=%s -text\n' + % largeFileSystem().attributeFilter() + for f in sorted(gitConfigList("git-p4.largeFileExtensions")) + ] + + ['/' + f.replace(' ', '[:space:]') + ' filter=%s -text\n' + % largeFileSystem().attributeFilter() + for f in sorted(self.largeFiles) if not self.hasLargeFileExtension(f) + ] + ) + + def hasLargeFileExtension(self, relPath): + return reduce( + lambda a, b: a or b, + [relPath.endswith('.' + e) for e in gitConfigList('git-p4.largeFileExtensions')], + False + ) + + def exceedsLargeFileThreshold(self, relPath, contents): + if gitConfigInt('git-p4.largeFileThreshold'): + contentsSize = sum(len(d) for d in contents) + if contentsSize > gitConfigInt('git-p4.largeFileThreshold'): + return True + if gitConfigInt('git-p4.largeFileCompressedThreshold'): + contentsSize = sum(len(d) for d in contents) + if contentsSize <= gitConfigInt('git-p4.largeFileCompressedThreshold'): + return False + contentFile = tempfile.NamedTemporaryFile(prefix='git-p4-large-file', delete=False) + for d in contents: + contentFile.write(d) + contentFile.flush() + compressedContentFile = tempfile.NamedTemporaryFile(prefix='git-p4-large-file', delete=False) + zf = zipfile.ZipFile(compressedContentFile.name, mode='w') + zf.write(contentFile.name, compress_type=zipfile.ZIP_DEFLATED) + zf.close() + compressedContentsSize = zf.infolist()[0].compress_size + os.remove(contentFile.name) + os.remove(compressedContentFile.name) + if compressedContentsSize > gitConfigInt('git-p4.largeFileCompressedThreshold'): + return True + return False + + def moveToLargeFileSystem(self, relPath, contents): + # Write P4 content to temp file + contentFile = tempfile.NamedTemporaryFile(prefix='git-p4-large-file', delete=False) + for d in contents: + contentFile.write(d) + contentFile.flush() + contentFile.close() + (git_mode, contents, localLargeFile) = \ + largeFileSystem().generatePointer(self.cloneDestination, contentFile.name) + # Move temp file to final location in large file system + largeFileDir = os.path.dirname(localLargeFile) + if not os.path.isdir(largeFileDir): + os.makedirs(largeFileDir) + shutil.move(contentFile.name, localLargeFile) + if verbose: + sys.stderr.write("%s moved to large file system (%s)\n" % (relPath, localLargeFile)) + + if gitConfigBool('git-p4.pushLargeFiles'): + largeFileSystem().pushFile(localLargeFile) + + self.largeFiles.add(relPath) + self.writeGitAttributesToStream() + return (git_mode, contents) + # output one file from the P4 stream # - helper for streamP4Files @@ -2226,17 +2355,16 @@ class P4Sync(Command, P4UserMap): text = regexp.sub(r'$\1$', text) contents = [ text ] - self.gitStream.write("M %s inline %s\n" % (git_mode, relPath)) + if relPath == '.gitattributes': + die('.gitattributes already exists in P4.') - # total length... - length = 0 - for d in contents: - length = length + len(d) + if (gitConfig('git-p4.largeFileSystem') and + ( self.exceedsLargeFileThreshold(relPath, contents) or + self.hasLargeFileExtension(relPath) + )): + (git_mode, contents) = self.moveToLargeFileSystem(relPath, contents) - self.gitStream.write("data %d\n" % length) - for d in contents: - self.gitStream.write(d) - self.gitStream.write("\n") + self.writeToGitStream(git_mode, relPath, contents) def streamOneP4Deletion(self, file): relPath = self.stripRepoPath(file['path'], self.branchPrefixes) @@ -2244,6 +2372,10 @@ class P4Sync(Command, P4UserMap): sys.stderr.write("delete %s\n" % relPath) self.gitStream.write("D %s\n" % relPath) + if relPath in self.largeFiles: + self.largeFiles.remove(relPath) + self.writeGitAttributesToStream() + # handle another chunk of streaming data def streamP4FilesCb(self, marshalled): diff --git a/t/t9823-git-p4-mock-lfs.sh b/t/t9823-git-p4-mock-lfs.sh new file mode 100755 index 0000000..6e4fd54 --- /dev/null +++ b/t/t9823-git-p4-mock-lfs.sh @@ -0,0 +1,106 @@ +#!/bin/sh + +test_description='Clone repositories and store files in Mock LFS' + +. ./lib-git-p4.sh + +test_file_in_mock () { + FILE="$1" + CONTENT="$2" + LOCAL_STORAGE=".git/mock-storage/local/$CONTENT" + SERVER_STORAGE=".git/mock-storage/remote/$CONTENT" + echo "pointer-$CONTENT" >expect_pointer + echo "$CONTENT" >expect_content + test_path_is_file "$FILE" && + test_path_is_file "$LOCAL_STORAGE" && + test_path_is_file "$SERVER_STORAGE" && + test_cmp expect_pointer "$FILE" && + test_cmp expect_content "$LOCAL_STORAGE" && + test_cmp expect_content "$SERVER_STORAGE" +} + +test_file_count_in_dir () { + DIR="$1" + EXPECTED_COUNT="$2" + find "$DIR" -type f >actual + test_line_count = $EXPECTED_COUNT actual +} + +test_expect_success 'start p4d' ' + start_p4d +' + +test_expect_success 'Create repo with binary files' ' + client_view "//depot/... //client/..." && + ( + cd "$cli" && + + echo "content 1 txt 23 bytes" >file1.txt && + p4 add file1.txt && + echo "content 2-3 bin 25 bytes" >file2.dat && + p4 add file2.dat && + p4 submit -d "Add text and binary file" && + + mkdir "path with spaces" && + echo "content 2-3 bin 25 bytes" >"path with spaces/file3.bin" && + p4 add "path with spaces/file3.bin" && + p4 submit -d "Add another binary file with same content and spaces in path" && + + echo "content 4 bin 26 bytes XX" >file4.bin && + p4 add file4.bin && + p4 submit -d "Add another binary file with different content" + ) +' + +test_expect_success 'Store files in Mock based on size (>24 bytes)' ' + client_view "//depot/... //client/..." && + test_when_finished cleanup_git && + ( + cd "$git" && + git init . && + git config git-p4.useClientSpec true && + git config git-p4.largeFileSystem MockLFS && + git config git-p4.largeFileThreshold 24 && + git config git-p4.pushLargeFiles True && + git p4 clone --destination="$git" //depot@all && + + test_file_in_mock file2.dat "content 2-3 bin 25 bytes" && + test_file_in_mock "path with spaces/file3.bin" "content 2-3 bin 25 bytes" && + test_file_in_mock file4.bin "content 4 bin 26 bytes XX" && + + test_file_count_in_dir ".git/mock-storage/local" 2 && + test_file_count_in_dir ".git/mock-storage/remote" 2 && + + cat >expect <<-\EOF && + + # + # Mock LFS + # + /file2.dat filter=mock -text + /file4.bin filter=mock -text + /path[:space:]with[:space:]spaces/file3.bin filter=mock -text + EOF + test_path_is_file .gitattributes && + test_cmp expect .gitattributes + ) +' + +test_expect_success 'Clone repo with existing .gitattributes file' ' + client_view "//depot/... //client/..." && + ( + cd "$cli" && + + echo "*.txt text" >.gitattributes && + p4 add .gitattributes && + p4 submit -d "Add .gitattributes" + ) && + + test_must_fail git p4 clone --use-client-spec --destination="$git" //depot 2>errs && + grep ".gitattributes already exists in P4." errs +' + +test_expect_success 'kill p4d' ' + kill_p4d +' + +test_done -- 2.5.1 -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
