thodg/libgit2/tests/object/blob/fromstream.c

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• Hash : 0a5c6028
  Author :
  Date : 2015-11-04T10:30:48
  

  blob: introduce creating a blob by writing into a stream
  
  The pair of `git_blob_create_frombuffer()` and
  `git_blob_create_frombuffer_commit()` is meant to replace
  `git_blob_create_fromchunks()` by providing a way for a user to write a
  new blob when they want filtering or they do not know the size.
  
  This approach allows the caller to retain control over when to add data
  to this buffer and a more natural fit into higher-level language's own
  stream abstractions instead of having to handle IO wait in the callback.
  
  The in-memory buffer size of 2MB is chosen somewhat arbitrarily to be a
  round multiple of usual page sizes and a value where most blobs seem
  likely to be either going to be way below or way over that size. It's
  also a round number of pages.
  
  This implementation re-uses the helper we have from `_fromchunks()` so
  we end up writing everything to disk, but hopefully more efficiently
  than with a default filebuf. A later optimisation can be to avoid
  writing the in-memory contents to disk, with some extra complexity.
  

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• tests/object/blob/fromstream.c

• #include "clar_libgit2.h"
  #include "buffer.h"
  #include "posix.h"
  #include "path.h"
  #include "fileops.h"
  
  static git_repository *repo;
  static char textual_content[] = "libgit2\n\r\n\0";
  
  void test_object_blob_fromstream__initialize(void)
  {
  	repo = cl_git_sandbox_init("testrepo.git");
  }
  
  void test_object_blob_fromstream__cleanup(void)
  {
  	cl_git_sandbox_cleanup();
  }
  
  static int text_chunked_source_cb(char *content, size_t max_length, void *payload)
  {
  	int *count;
  
  	GIT_UNUSED(max_length);
  
  	count = (int *)payload;
  	(*count)--;
  
  	if (*count == 0)
  		return 0;
  
  	strcpy(content, textual_content);
  	return (int)strlen(textual_content);
  }
  
  void test_object_blob_fromstream__multiple_write(void)
  {
  	git_oid expected_id, id;
  	git_object *blob;
  	git_writestream *stream;
  	int i, howmany = 6;
  
  	cl_git_pass(git_oid_fromstr(&expected_id, "321cbdf08803c744082332332838df6bd160f8f9"));
  
  	cl_git_fail_with(GIT_ENOTFOUND,
  			 git_object_lookup(&blob, repo, &expected_id, GIT_OBJ_ANY));
  
  	cl_git_pass(git_blob_create_fromstream(&stream, repo, NULL));
  
  	for (i = 0; i < howmany; i++)
  		cl_git_pass(stream->write(stream, textual_content, strlen(textual_content)));
  
  	cl_git_pass(git_blob_create_fromstream_end(&id, stream));
  	cl_assert_equal_oid(&expected_id, &id);
  
  	cl_git_pass(git_object_lookup(&blob, repo, &expected_id, GIT_OBJ_BLOB));
  
  	git_object_free(blob);
  }
  
  #define GITATTR "* text=auto\n" \
  	"*.txt text\n" \
  	"*.data binary\n"
  
  static void write_attributes(git_repository *repo)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	cl_git_pass(git_buf_joinpath(&buf, git_repository_path(repo), "info"));
  	cl_git_pass(git_buf_joinpath(&buf, git_buf_cstr(&buf), "attributes"));
  
  	cl_git_pass(git_futils_mkpath2file(git_buf_cstr(&buf), 0777));
  	cl_git_rewritefile(git_buf_cstr(&buf), GITATTR);
  
  	git_buf_free(&buf);
  }
  
  static void assert_named_chunked_blob(const char *expected_sha, const char *fake_name)
  {
  	git_oid expected_id, id;
  	git_writestream *stream;
  	int i, howmany = 6;
  
  	cl_git_pass(git_oid_fromstr(&expected_id, expected_sha));
  
  	cl_git_pass(git_blob_create_fromstream(&stream, repo, fake_name));
  
  	for (i = 0; i < howmany; i++)
  		cl_git_pass(stream->write(stream, textual_content, strlen(textual_content)));
  
  	cl_git_pass(git_blob_create_fromstream_end(&id, stream));
  
  	cl_assert_equal_oid(&expected_id, &id);
  }
  
  void test_object_blob_fromstream__creating_a_blob_from_chunks_honors_the_attributes_directives(void)
  {
  	write_attributes(repo);
  
  	assert_named_chunked_blob("321cbdf08803c744082332332838df6bd160f8f9", "dummy.data");
  	assert_named_chunked_blob("e9671e138a780833cb689753570fd10a55be84fb", "dummy.txt");
  	assert_named_chunked_blob("e9671e138a780833cb689753570fd10a55be84fb", "dummy.dunno");
  }
  

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