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Honor alternate entries in the ODB

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The alternates file is now parsed, and the alternate ODB folders are
added as separate backends. This allows the library to efficiently query
the alternate folders.

Signed-off-by: Vicent Marti <tanoku@gmail.com>
This commit is contained in:
Vicent Marti 2011-02-09 12:46:54 +02:00
parent 995f9c34a5
commit 5a800efc42
1 changed files with 63 additions and 16 deletions
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79
src/odb.c
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@ -33,6 +33,8 @@
#include "git2/odb_backend.h"
#define GIT_ALTERNATES_FILE "info/alternates"
static int format_object_header(char *hdr, size_t n, git_rawobj *obj)
{
const char *type_str = git_object_type2string(obj->type);
@ -171,32 +173,77 @@ int git_odb_add_backend(git_odb *odb, git_odb_backend *backend)
return GIT_SUCCESS;
}
static int add_default_backends(git_odb *db, const char *objects_dir)
{
git_odb_backend *loose, *packed;
int error;
/* add the loose object backend */
error = git_odb_backend_loose(&loose, objects_dir);
if (error < GIT_SUCCESS)
return error;
error = git_odb_add_backend(db, loose);
if (error < GIT_SUCCESS)
return error;
/* add the packed file backend */
error = git_odb_backend_pack(&packed, objects_dir);
if (error < GIT_SUCCESS)
return error;
error = git_odb_add_backend(db, packed);
if (error < GIT_SUCCESS)
return error;
return GIT_SUCCESS;
}
static int load_alternates(git_odb *odb, const char *objects_dir)
{
char alternates_path[GIT_PATH_MAX];
char alternate[GIT_PATH_MAX];
char *buffer;
gitfo_buf alternates_buf = GITFO_BUF_INIT;
int error;
git__joinpath(alternates_path, objects_dir, GIT_ALTERNATES_FILE);
if (gitfo_exists(alternates_path) < GIT_SUCCESS)
return GIT_SUCCESS;
if (gitfo_read_file(&alternates_buf, alternates_path) < GIT_SUCCESS)
return GIT_EOSERR;
buffer = (char *)alternates_buf.data;
error = GIT_SUCCESS;
/* add each alternate as a new backend; one alternate per line */
while ((error == GIT_SUCCESS) && (buffer = git__strtok(alternate, buffer, "\r\n")) != NULL)
error = add_default_backends(odb, alternate);
gitfo_free_buf(&alternates_buf);
return error;
}
int git_odb_open(git_odb **out, const char *objects_dir)
{
git_odb *db;
git_odb_backend *loose, *packed;
int error;
assert(out && objects_dir);
*out = NULL;
if ((error = git_odb_new(&db)) < 0)
return error;
/* add the loose object backend */
if (git_odb_backend_loose(&loose, objects_dir) == 0) {
error = git_odb_add_backend(db, loose);
if (error < 0)
goto cleanup;
}
if ((error = add_default_backends(db, objects_dir)) < GIT_SUCCESS)
goto cleanup;
/* add the packed file backend */
if (git_odb_backend_pack(&packed, objects_dir) == 0) {
error = git_odb_add_backend(db, packed);
if (error < 0)
goto cleanup;
}
/* TODO: add altenernates as new backends;
* how elevant is that? very elegant. */
if ((error = load_alternates(db, objects_dir)) < GIT_SUCCESS)
goto cleanup;
*out = db;
return GIT_SUCCESS;