Hash :
971c90be
Author :
Date :
2011-02-28T16:54:13
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/*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* In addition to the permissions in the GNU General Public License,
* the authors give you unlimited permission to link the compiled
* version of this file into combinations with other programs,
* and to distribute those combinations without any restriction
* coming from the use of this file. (The General Public License
* restrictions do apply in other respects; for example, they cover
* modification of the file, and distribution when not linked into
* a combined executable.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <stddef.h>
#include "common.h"
#include "repository.h"
#include "index.h"
#include "hash.h"
#include "git2/odb.h"
#include "git2/blob.h"
#define entry_size(type,len) ((offsetof(type, path) + (len) + 8) & ~7)
#define short_entry_size(len) entry_size(struct entry_short, len)
#define long_entry_size(len) entry_size(struct entry_long, len)
#define minimal_entry_size (offsetof(struct entry_short, path))
static const size_t INDEX_FOOTER_SIZE = GIT_OID_RAWSZ;
static const size_t INDEX_HEADER_SIZE = 12;
static const unsigned int INDEX_VERSION_NUMBER = 2;
static const unsigned int INDEX_VERSION_NUMBER_EXT = 3;
static const unsigned int INDEX_HEADER_SIG = 0x44495243;
static const char INDEX_EXT_TREECACHE_SIG[] = {'T', 'R', 'E', 'E'};
struct index_header {
uint32_t signature;
uint32_t version;
uint32_t entry_count;
};
struct index_extension {
char signature[4];
uint32_t extension_size;
};
struct entry_time {
uint32_t seconds;
uint32_t nanoseconds;
};
struct entry_short {
struct entry_time ctime;
struct entry_time mtime;
uint32_t dev;
uint32_t ino;
uint32_t mode;
uint32_t uid;
uint32_t gid;
uint32_t file_size;
git_oid oid;
uint16_t flags;
char path[1]; /* arbritrary length */
};
struct entry_long {
struct entry_time ctime;
struct entry_time mtime;
uint32_t dev;
uint32_t ino;
uint32_t mode;
uint32_t uid;
uint32_t gid;
uint32_t file_size;
git_oid oid;
uint16_t flags;
uint16_t flags_extended;
char path[1]; /* arbritrary length */
};
/* local declarations */
static size_t read_extension(git_index *index, const char *buffer, size_t buffer_size);
static size_t read_entry(git_index_entry *dest, const void *buffer, size_t buffer_size);
static int read_header(struct index_header *dest, const void *buffer);
static int read_tree(git_index *index, const char *buffer, size_t buffer_size);
static git_index_tree *read_tree_internal(const char **, const char *, git_index_tree *);
static int parse_index(git_index *index, const char *buffer, size_t buffer_size);
static void sort_index(git_index *index);
static int write_index(git_index *index, git_filebuf *file);
int index_srch(const void *key, const void *array_member)
{
const char *filename = (const char *)key;
const git_index_entry *entry = *(const git_index_entry **)(array_member);
return strcmp(filename, entry->path);
}
int index_cmp(const void *a, const void *b)
{
const git_index_entry *entry_a = *(const git_index_entry **)(a);
const git_index_entry *entry_b = *(const git_index_entry **)(b);
return strcmp(entry_a->path, entry_b->path);
}
static int index_initialize(git_index **index_out, git_repository *owner, const char *index_path)
{
git_index *index;
assert(index_out && index_path);
index = git__malloc(sizeof(git_index));
if (index == NULL)
return GIT_ENOMEM;
memset(index, 0x0, sizeof(git_index));
index->index_file_path = git__strdup(index_path);
if (index->index_file_path == NULL) {
free(index);
return GIT_ENOMEM;
}
index->repository = owner;
git_vector_init(&index->entries, 32, index_cmp);
/* Check if index file is stored on disk already */
if (gitfo_exists(index->index_file_path) == 0)
index->on_disk = 1;
*index_out = index;
return GIT_SUCCESS;
}
int git_index_open_bare(git_index **index_out, const char *index_path)
{
return index_initialize(index_out, NULL, index_path);
}
int git_index_open_inrepo(git_index **index_out, git_repository *repo)
{
if (repo->is_bare)
return GIT_EBAREINDEX;
return index_initialize(index_out, repo, repo->path_index);
}
void git_index_free(git_index *index)
{
if (index == NULL || index->repository != NULL)
return;
git_index_clear(index);
git_vector_free(&index->entries);
free(index->index_file_path);
free(index);
}
static void free_tree(git_index_tree *tree)
{
unsigned int i;
if (tree == NULL)
return;
for (i = 0; i < tree->children_count; ++i)
free_tree(tree->children[i]);
free(tree->name);
free(tree->children);
free(tree);
}
void git_index_clear(git_index *index)
{
unsigned int i;
assert(index);
for (i = 0; i < index->entries.length; ++i) {
git_index_entry *e;
e = git_vector_get(&index->entries, i);
free(e->path);
free(e);
}
git_vector_clear(&index->entries);
index->last_modified = 0;
free_tree(index->tree);
index->tree = NULL;
}
int git_index_read(git_index *index)
{
struct stat indexst;
int error = GIT_SUCCESS;
assert(index->index_file_path);
if (!index->on_disk || gitfo_exists(index->index_file_path) < 0) {
git_index_clear(index);
index->on_disk = 0;
return GIT_SUCCESS;
}
if (gitfo_stat(index->index_file_path, &indexst) < 0)
return GIT_EOSERR;
if (!S_ISREG(indexst.st_mode))
return GIT_ENOTFOUND;
if (indexst.st_mtime != index->last_modified) {
gitfo_buf buffer;
if (gitfo_read_file(&buffer, index->index_file_path) < GIT_SUCCESS)
return GIT_EOSERR;
git_index_clear(index);
error = parse_index(index, buffer.data, buffer.len);
if (error == GIT_SUCCESS)
index->last_modified = indexst.st_mtime;
gitfo_free_buf(&buffer);
}
return error;
}
int git_index_write(git_index *index)
{
git_filebuf file;
struct stat indexst;
int error;
sort_index(index);
if ((error = git_filebuf_open(&file, index->index_file_path, GIT_FILEBUF_HASH_CONTENTS)) < GIT_SUCCESS)
return error;
if ((error = write_index(index, &file)) < GIT_SUCCESS) {
git_filebuf_cleanup(&file);
return error;
}
if ((error = git_filebuf_commit(&file)) < GIT_SUCCESS)
return error;
if (gitfo_stat(index->index_file_path, &indexst) == 0) {
index->last_modified = indexst.st_mtime;
index->on_disk = 1;
}
return GIT_SUCCESS;
}
unsigned int git_index_entrycount(git_index *index)
{
assert(index);
return index->entries.length;
}
git_index_entry *git_index_get(git_index *index, int n)
{
assert(index);
sort_index(index);
return git_vector_get(&index->entries, (unsigned int)n);
}
int git_index_add(git_index *index, const char *rel_path, int stage)
{
git_index_entry entry;
char full_path[GIT_PATH_MAX];
struct stat st;
int error;
if (index->repository == NULL)
return GIT_EBAREINDEX;
git__joinpath(full_path, index->repository->path_workdir, rel_path);
if (gitfo_exists(full_path) < 0)
return GIT_ENOTFOUND;
if (gitfo_stat(full_path, &st) < 0)
return GIT_EOSERR;
if (stage < 0 || stage > 3)
return GIT_ERROR;
memset(&entry, 0x0, sizeof(git_index_entry));
entry.ctime.seconds = st.st_ctime;
entry.mtime.seconds = st.st_mtime;
/* entry.mtime.nanoseconds = st.st_mtimensec; */
/* entry.ctime.nanoseconds = st.st_ctimensec; */
entry.dev= st.st_rdev;
entry.ino = st.st_ino;
entry.mode = st.st_mode;
entry.uid = st.st_uid;
entry.gid = st.st_gid;
entry.file_size = st.st_size;
/* write the blob to disk and get the oid */
if ((error = git_blob_writefile(&entry.oid, index->repository, full_path)) < GIT_SUCCESS)
return error;
entry.flags |= (stage << GIT_IDXENTRY_STAGESHIFT);
entry.path = (char *)rel_path; /* do not duplicate; index_insert already does this */
return git_index_insert(index, &entry);
}
void sort_index(git_index *index)
{
git_vector_sort(&index->entries);
}
int git_index_insert(git_index *index, const git_index_entry *source_entry)
{
git_index_entry *entry;
size_t path_length;
int position;
assert(index && source_entry);
if (source_entry->path == NULL)
return GIT_EMISSINGOBJDATA;
entry = git__malloc(sizeof(git_index_entry));
if (entry == NULL)
return GIT_ENOMEM;
memcpy(entry, source_entry, sizeof(git_index_entry));
/* duplicate the path string so we own it */
entry->path = git__strdup(entry->path);
if (entry->path == NULL)
return GIT_ENOMEM;
/* make sure that the path length flag is correct */
path_length = strlen(entry->path);
entry->flags &= ~GIT_IDXENTRY_NAMEMASK;
if (path_length < GIT_IDXENTRY_NAMEMASK)
entry->flags |= path_length & GIT_IDXENTRY_NAMEMASK;
else
entry->flags |= GIT_IDXENTRY_NAMEMASK;;
/* look if an entry with this path already exists */
position = git_index_find(index, source_entry->path);
/* if no entry exists, add the entry at the end;
* the index is no longer sorted */
if (position == GIT_ENOTFOUND) {
if (git_vector_insert(&index->entries, entry) < GIT_SUCCESS)
return GIT_ENOMEM;
/* if a previous entry exists, replace it */
} else {
git_index_entry **entry_array = (git_index_entry **)index->entries.contents;
free(entry_array[position]->path);
free(entry_array[position]);
entry_array[position] = entry;
}
return GIT_SUCCESS;
}
int git_index_remove(git_index *index, int position)
{
assert(index);
sort_index(index);
return git_vector_remove(&index->entries, (unsigned int)position);
}
int git_index_find(git_index *index, const char *path)
{
sort_index(index);
return git_vector_bsearch2(&index->entries, index_srch, path);
}
static git_index_tree *read_tree_internal(
const char **buffer_in, const char *buffer_end, git_index_tree *parent)
{
git_index_tree *tree;
const char *name_start, *buffer;
if ((tree = git__malloc(sizeof(git_index_tree))) == NULL)
return NULL;
memset(tree, 0x0, sizeof(git_index_tree));
tree->parent = parent;
buffer = name_start = *buffer_in;
if ((buffer = memchr(buffer, '\0', buffer_end - buffer)) == NULL)
goto error_cleanup;
/* NUL-terminated tree name */
tree->name = git__strdup(name_start);
if (++buffer >= buffer_end)
goto error_cleanup;
/* Blank-terminated ASCII decimal number of entries in this tree */
tree->entries = strtol(buffer, (char **)&buffer, 10);
if (*buffer != ' ' || ++buffer >= buffer_end)
goto error_cleanup;
/* Number of children of the tree, newline-terminated */
tree->children_count = strtol(buffer, (char **)&buffer, 10);
if (*buffer != '\n' || ++buffer >= buffer_end)
goto error_cleanup;
/* 160-bit SHA-1 for this tree and it's children */
if (buffer + GIT_OID_RAWSZ > buffer_end)
goto error_cleanup;
git_oid_mkraw(&tree->oid, (const unsigned char *)buffer);
buffer += GIT_OID_RAWSZ;
/* Parse children: */
if (tree->children_count > 0) {
unsigned int i;
tree->children = git__malloc(tree->children_count * sizeof(git_index_tree *));
if (tree->children == NULL)
goto error_cleanup;
for (i = 0; i < tree->children_count; ++i) {
tree->children[i] = read_tree_internal(&buffer, buffer_end, tree);
if (tree->children[i] == NULL)
goto error_cleanup;
}
}
*buffer_in = buffer;
return tree;
error_cleanup:
free_tree(tree);
return NULL;
}
static int read_tree(git_index *index, const char *buffer, size_t buffer_size)
{
const char *buffer_end = buffer + buffer_size;
index->tree = read_tree_internal(&buffer, buffer_end, NULL);
return (index->tree != NULL && buffer == buffer_end) ? GIT_SUCCESS : GIT_EOBJCORRUPTED;
}
static size_t read_entry(git_index_entry *dest, const void *buffer, size_t buffer_size)
{
size_t path_length, entry_size;
uint16_t flags_raw;
const char *path_ptr;
const struct entry_short *source;
if (INDEX_FOOTER_SIZE + minimal_entry_size > buffer_size)
return 0;
memset(dest, 0x0, sizeof(git_index_entry));
source = (const struct entry_short *)(buffer);
dest->ctime.seconds = (time_t)ntohl(source->ctime.seconds);
dest->ctime.nanoseconds = (time_t)ntohl(source->ctime.nanoseconds);
dest->mtime.seconds = (time_t)ntohl(source->mtime.seconds);
dest->mtime.nanoseconds = (time_t)ntohl(source->mtime.nanoseconds);
dest->dev = ntohl(source->dev);
dest->ino = ntohl(source->ino);
dest->mode = ntohl(source->mode);
dest->uid = ntohl(source->uid);
dest->gid = ntohl(source->gid);
dest->file_size = ntohl(source->file_size);
git_oid_cpy(&dest->oid, &source->oid);
dest->flags = ntohs(source->flags);
if (dest->flags & GIT_IDXENTRY_EXTENDED) {
struct entry_long *source_l = (struct entry_long *)source;
path_ptr = source_l->path;
flags_raw = ntohs(source_l->flags_extended);
memcpy(&dest->flags_extended, &flags_raw, 2);
} else
path_ptr = source->path;
path_length = dest->flags & GIT_IDXENTRY_NAMEMASK;
/* if this is a very long string, we must find its
* real length without overflowing */
if (path_length == 0xFFF) {
const char *path_end;
path_end = memchr(path_ptr, '\0', buffer_size);
if (path_end == NULL)
return 0;
path_length = path_end - path_ptr;
}
if (dest->flags & GIT_IDXENTRY_EXTENDED)
entry_size = long_entry_size(path_length);
else
entry_size = short_entry_size(path_length);
if (INDEX_FOOTER_SIZE + entry_size > buffer_size)
return 0;
dest->path = git__strdup(path_ptr);
assert(dest->path);
return entry_size;
}
static int read_header(struct index_header *dest, const void *buffer)
{
const struct index_header *source;
source = (const struct index_header *)(buffer);
dest->signature = ntohl(source->signature);
if (dest->signature != INDEX_HEADER_SIG)
return GIT_EOBJCORRUPTED;
dest->version = ntohl(source->version);
if (dest->version != INDEX_VERSION_NUMBER_EXT &&
dest->version != INDEX_VERSION_NUMBER)
return GIT_EOBJCORRUPTED;
dest->entry_count = ntohl(source->entry_count);
return GIT_SUCCESS;
}
static size_t read_extension(git_index *index, const char *buffer, size_t buffer_size)
{
const struct index_extension *source;
struct index_extension dest;
size_t total_size;
source = (const struct index_extension *)(buffer);
memcpy(dest.signature, source->signature, 4);
dest.extension_size = ntohl(source->extension_size);
total_size = dest.extension_size + sizeof(struct index_extension);
if (buffer_size - total_size < INDEX_FOOTER_SIZE)
return 0;
/* optional extension */
if (dest.signature[0] >= 'A' && dest.signature[0] <= 'Z') {
/* tree cache */
if (memcmp(dest.signature, INDEX_EXT_TREECACHE_SIG, 4) == 0) {
if (read_tree(index, buffer + 8, dest.extension_size) < GIT_SUCCESS)
return 0;
}
} else {
/* we cannot handle non-ignorable extensions;
* in fact they aren't even defined in the standard */
return 0;
}
return total_size;
}
static int parse_index(git_index *index, const char *buffer, size_t buffer_size)
{
unsigned int i;
struct index_header header;
git_oid checksum_calculated, checksum_expected;
#define seek_forward(_increase) { \
if (_increase >= buffer_size) \
return GIT_EOBJCORRUPTED; \
buffer += _increase; \
buffer_size -= _increase;\
}
if (buffer_size < INDEX_HEADER_SIZE + INDEX_FOOTER_SIZE)
return GIT_EOBJCORRUPTED;
/* Precalculate the SHA1 of the files's contents -- we'll match it to
* the provided SHA1 in the footer */
git_hash_buf(&checksum_calculated, (const void *)buffer, buffer_size - INDEX_FOOTER_SIZE);
/* Parse header */
if (read_header(&header, buffer) < GIT_SUCCESS)
return GIT_EOBJCORRUPTED;
seek_forward(INDEX_HEADER_SIZE);
git_vector_clear(&index->entries);
/* Parse all the entries */
for (i = 0; i < header.entry_count && buffer_size > INDEX_FOOTER_SIZE; ++i) {
size_t entry_size;
git_index_entry *entry;
entry = git__malloc(sizeof(git_index_entry));
if (entry == NULL)
return GIT_ENOMEM;
entry_size = read_entry(entry, buffer, buffer_size);
/* 0 bytes read means an object corruption */
if (entry_size == 0)
return GIT_EOBJCORRUPTED;
if (git_vector_insert(&index->entries, entry) < GIT_SUCCESS)
return GIT_ENOMEM;
seek_forward(entry_size);
}
if (i != header.entry_count)
return GIT_EOBJCORRUPTED;
/* There's still space for some extensions! */
while (buffer_size > INDEX_FOOTER_SIZE) {
size_t extension_size;
extension_size = read_extension(index, buffer, buffer_size);
/* see if we have read any bytes from the extension */
if (extension_size == 0)
return GIT_EOBJCORRUPTED;
seek_forward(extension_size);
}
if (buffer_size != INDEX_FOOTER_SIZE)
return GIT_EOBJCORRUPTED;
/* 160-bit SHA-1 over the content of the index file before this checksum. */
git_oid_mkraw(&checksum_expected, (const unsigned char *)buffer);
if (git_oid_cmp(&checksum_calculated, &checksum_expected) != 0)
return GIT_EOBJCORRUPTED;
#undef seek_forward
/* force sorting in the vector: the entries are
* assured to be sorted on the index */
index->entries.sorted = 1;
return GIT_SUCCESS;
}
static int write_disk_entry(git_filebuf *file, git_index_entry *entry)
{
struct entry_short *ondisk;
size_t path_len, disk_size;
char *path;
path_len = strlen(entry->path);
if (entry->flags & GIT_IDXENTRY_EXTENDED)
disk_size = long_entry_size(path_len);
else
disk_size = short_entry_size(path_len);
if (git_filebuf_reserve(file, (void **)&ondisk, disk_size) < GIT_SUCCESS)
return GIT_ENOMEM;
memset(ondisk, 0x0, disk_size);
ondisk->ctime.seconds = htonl((unsigned long)entry->ctime.seconds);
ondisk->mtime.seconds = htonl((unsigned long)entry->mtime.seconds);
ondisk->ctime.nanoseconds = htonl(entry->ctime.nanoseconds);
ondisk->mtime.nanoseconds = htonl(entry->mtime.nanoseconds);
ondisk->dev = htonl(entry->dev);
ondisk->ino = htonl(entry->ino);
ondisk->mode = htonl(entry->mode);
ondisk->uid = htonl(entry->uid);
ondisk->gid = htonl(entry->gid);
ondisk->file_size = htonl((unsigned long)entry->file_size);
git_oid_cpy(&ondisk->oid, &entry->oid);
ondisk->flags = htons(entry->flags);
if (entry->flags & GIT_IDXENTRY_EXTENDED) {
struct entry_long *ondisk_ext;
ondisk_ext = (struct entry_long *)ondisk;
ondisk_ext->flags_extended = htons(entry->flags_extended);
path = ondisk_ext->path;
}
else
path = ondisk->path;
memcpy(path, entry->path, path_len);
return GIT_SUCCESS;
}
static int write_entries(git_index *index, git_filebuf *file)
{
unsigned int i;
for (i = 0; i < index->entries.length; ++i) {
git_index_entry *entry;
entry = git_vector_get(&index->entries, i);
if (write_disk_entry(file, entry) < GIT_SUCCESS)
return GIT_ENOMEM;
}
return GIT_SUCCESS;
}
static int write_index(git_index *index, git_filebuf *file)
{
int error = GIT_SUCCESS;
git_oid hash_final;
struct index_header header;
int is_extended = 1;
assert(index && file);
header.signature = htonl(INDEX_HEADER_SIG);
header.version = htonl(is_extended ? INDEX_VERSION_NUMBER : INDEX_VERSION_NUMBER_EXT);
header.entry_count = htonl(index->entries.length);
git_filebuf_write(file, &header, sizeof(struct index_header));
error = write_entries(index, file);
if (error < GIT_SUCCESS)
return error;
/* TODO: write extensions (tree cache) */
/* get out the hash for all the contents we've appended to the file */
git_filebuf_hash(&hash_final, file);
/* write it at the end of the file */
git_filebuf_write(file, hash_final.id, GIT_OID_RAWSZ);
return error;
}