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|
/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "attr_file.h"
#include "repository.h"
#include "filebuf.h"
#include "attrcache.h"
#include "git2/blob.h"
#include "git2/tree.h"
#include "index.h"
#include <ctype.h>
static void attr_file_free(git_attr_file *file)
{
bool unlock = !git_mutex_lock(&file->lock);
git_attr_file__clear_rules(file, false);
git_pool_clear(&file->pool);
if (unlock)
git_mutex_unlock(&file->lock);
git_mutex_free(&file->lock);
git__memzero(file, sizeof(*file));
git__free(file);
}
int git_attr_file__new(
git_attr_file **out,
git_attr_file_entry *entry,
git_attr_file_source source)
{
git_attr_file *attrs = git__calloc(1, sizeof(git_attr_file));
GIT_ERROR_CHECK_ALLOC(attrs);
if (git_mutex_init(&attrs->lock) < 0) {
git_error_set(GIT_ERROR_OS, "failed to initialize lock");
git__free(attrs);
return -1;
}
git_pool_init(&attrs->pool, 1);
GIT_REFCOUNT_INC(attrs);
attrs->entry = entry;
attrs->source = source;
*out = attrs;
return 0;
}
int git_attr_file__clear_rules(git_attr_file *file, bool need_lock)
{
unsigned int i;
git_attr_rule *rule;
if (need_lock && git_mutex_lock(&file->lock) < 0) {
git_error_set(GIT_ERROR_OS, "failed to lock attribute file");
return -1;
}
git_vector_foreach(&file->rules, i, rule)
git_attr_rule__free(rule);
git_vector_free(&file->rules);
if (need_lock)
git_mutex_unlock(&file->lock);
return 0;
}
void git_attr_file__free(git_attr_file *file)
{
if (!file)
return;
GIT_REFCOUNT_DEC(file, attr_file_free);
}
static int attr_file_oid_from_index(
git_oid *oid, git_repository *repo, const char *path)
{
int error;
git_index *idx;
size_t pos;
const git_index_entry *entry;
if ((error = git_repository_index__weakptr(&idx, repo)) < 0 ||
(error = git_index__find_pos(&pos, idx, path, 0, 0)) < 0)
return error;
if (!(entry = git_index_get_byindex(idx, pos)))
return GIT_ENOTFOUND;
*oid = entry->id;
return 0;
}
int git_attr_file__load(
git_attr_file **out,
git_repository *repo,
git_attr_session *attr_session,
git_attr_file_entry *entry,
git_attr_file_source source,
git_attr_file_parser parser)
{
int error = 0;
git_blob *blob = NULL;
git_buf content = GIT_BUF_INIT;
git_attr_file *file;
struct stat st;
bool nonexistent = false;
*out = NULL;
switch (source) {
case GIT_ATTR_FILE__IN_MEMORY:
/* in-memory attribute file doesn't need data */
break;
case GIT_ATTR_FILE__FROM_INDEX: {
git_oid id;
if ((error = attr_file_oid_from_index(&id, repo, entry->path)) < 0 ||
(error = git_blob_lookup(&blob, repo, &id)) < 0)
return error;
/* Do not assume that data straight from the ODB is NULL-terminated;
* copy the contents of a file to a buffer to work on */
git_buf_put(&content, git_blob_rawcontent(blob), git_blob_rawsize(blob));
break;
}
case GIT_ATTR_FILE__FROM_FILE: {
int fd = -1;
/* For open or read errors, pretend that we got ENOTFOUND. */
/* TODO: issue warning when warning API is available */
if (p_stat(entry->fullpath, &st) < 0 ||
S_ISDIR(st.st_mode) ||
(fd = git_futils_open_ro(entry->fullpath)) < 0 ||
(error = git_futils_readbuffer_fd(&content, fd, (size_t)st.st_size)) < 0)
nonexistent = true;
if (fd >= 0)
p_close(fd);
break;
}
default:
git_error_set(GIT_ERROR_INVALID, "unknown file source %d", source);
return -1;
}
if ((error = git_attr_file__new(&file, entry, source)) < 0)
goto cleanup;
/* store the key of the attr_reader; don't bother with cache
* invalidation during the same attr reader session.
*/
if (attr_session)
file->session_key = attr_session->key;
if (parser && (error = parser(repo, file, git_buf_cstr(&content))) < 0) {
git_attr_file__free(file);
goto cleanup;
}
/* write cache breakers */
if (nonexistent)
file->nonexistent = 1;
else if (source == GIT_ATTR_FILE__FROM_INDEX)
git_oid_cpy(&file->cache_data.oid, git_blob_id(blob));
else if (source == GIT_ATTR_FILE__FROM_FILE)
git_futils_filestamp_set_from_stat(&file->cache_data.stamp, &st);
/* else always cacheable */
*out = file;
cleanup:
git_blob_free(blob);
git_buf_dispose(&content);
return error;
}
int git_attr_file__out_of_date(
git_repository *repo,
git_attr_session *attr_session,
git_attr_file *file)
{
if (!file)
return 1;
/* we are never out of date if we just created this data in the same
* attr_session; otherwise, nonexistent files must be invalidated
*/
if (attr_session && attr_session->key == file->session_key)
return 0;
else if (file->nonexistent)
return 1;
switch (file->source) {
case GIT_ATTR_FILE__IN_MEMORY:
return 0;
case GIT_ATTR_FILE__FROM_FILE:
return git_futils_filestamp_check(
&file->cache_data.stamp, file->entry->fullpath);
case GIT_ATTR_FILE__FROM_INDEX: {
int error;
git_oid id;
if ((error = attr_file_oid_from_index(
&id, repo, file->entry->path)) < 0)
return error;
return (git_oid__cmp(&file->cache_data.oid, &id) != 0);
}
default:
git_error_set(GIT_ERROR_INVALID, "invalid file type %d", file->source);
return -1;
}
}
static int sort_by_hash_and_name(const void *a_raw, const void *b_raw);
static void git_attr_rule__clear(git_attr_rule *rule);
static bool parse_optimized_patterns(
git_attr_fnmatch *spec,
git_pool *pool,
const char *pattern);
int git_attr_file__parse_buffer(
git_repository *repo, git_attr_file *attrs, const char *data)
{
int error = 0;
const char *scan = data, *context = NULL;
git_attr_rule *rule = NULL;
/* if subdir file path, convert context for file paths */
if (attrs->entry &&
git_path_root(attrs->entry->path) < 0 &&
!git__suffixcmp(attrs->entry->path, "/" GIT_ATTR_FILE))
context = attrs->entry->path;
if (git_mutex_lock(&attrs->lock) < 0) {
git_error_set(GIT_ERROR_OS, "failed to lock attribute file");
return -1;
}
while (!error && *scan) {
/* allocate rule if needed */
if (!rule && !(rule = git__calloc(1, sizeof(*rule)))) {
error = -1;
break;
}
rule->match.flags =
GIT_ATTR_FNMATCH_ALLOWNEG | GIT_ATTR_FNMATCH_ALLOWMACRO;
/* parse the next "pattern attr attr attr" line */
if (!(error = git_attr_fnmatch__parse(
&rule->match, &attrs->pool, context, &scan)) &&
!(error = git_attr_assignment__parse(
repo, &attrs->pool, &rule->assigns, &scan)))
{
if (rule->match.flags & GIT_ATTR_FNMATCH_MACRO)
/* TODO: warning if macro found in file below repo root */
error = git_attr_cache__insert_macro(repo, rule);
else
error = git_vector_insert(&attrs->rules, rule);
}
/* if the rule wasn't a pattern, on to the next */
if (error < 0) {
git_attr_rule__clear(rule); /* reset rule contents */
if (error == GIT_ENOTFOUND)
error = 0;
} else {
rule = NULL; /* vector now "owns" the rule */
}
}
git_mutex_unlock(&attrs->lock);
git_attr_rule__free(rule);
return error;
}
uint32_t git_attr_file__name_hash(const char *name)
{
uint32_t h = 5381;
int c;
assert(name);
while ((c = (int)*name++) != 0)
h = ((h << 5) + h) + c;
return h;
}
int git_attr_file__lookup_one(
git_attr_file *file,
git_attr_path *path,
const char *attr,
const char **value)
{
size_t i;
git_attr_name name;
git_attr_rule *rule;
*value = NULL;
name.name = attr;
name.name_hash = git_attr_file__name_hash(attr);
git_attr_file__foreach_matching_rule(file, path, i, rule) {
size_t pos;
if (!git_vector_bsearch(&pos, &rule->assigns, &name)) {
*value = ((git_attr_assignment *)
git_vector_get(&rule->assigns, pos))->value;
break;
}
}
return 0;
}
int git_attr_file__load_standalone(git_attr_file **out, const char *path)
{
int error;
git_attr_file *file;
git_buf content = GIT_BUF_INIT;
error = git_attr_file__new(&file, NULL, GIT_ATTR_FILE__FROM_FILE);
if (error < 0)
return error;
error = git_attr_cache__alloc_file_entry(
&file->entry, NULL, path, &file->pool);
if (error < 0) {
git_attr_file__free(file);
return error;
}
/* because the cache entry is allocated from the file's own pool, we
* don't have to free it - freeing file+pool will free cache entry, too.
*/
if (!(error = git_futils_readbuffer(&content, path))) {
error = git_attr_file__parse_buffer(NULL, file, content.ptr);
git_buf_dispose(&content);
}
if (error < 0)
git_attr_file__free(file);
else
*out = file;
return error;
}
bool git_attr_fnmatch__match(
git_attr_fnmatch *match,
git_attr_path *path)
{
const char *relpath = path->path;
const char *filename;
int flags = 0;
/*
* If the rule was generated in a subdirectory, we must only
* use it for paths inside that directory. We can thus return
* a non-match if the prefixes don't match.
*/
if (match->containing_dir) {
if (match->flags & GIT_ATTR_FNMATCH_ICASE) {
if (git__strncasecmp(path->path, match->containing_dir, match->containing_dir_length))
return 0;
} else {
if (git__prefixcmp(path->path, match->containing_dir))
return 0;
}
relpath += match->containing_dir_length;
}
if (match->flags & GIT_ATTR_FNMATCH_ICASE)
flags |= FNM_CASEFOLD;
if (match->flags & GIT_ATTR_FNMATCH_LEADINGDIR)
flags |= FNM_LEADING_DIR;
if (match->flags & GIT_ATTR_FNMATCH_FULLPATH) {
filename = relpath;
flags |= FNM_PATHNAME;
} else {
filename = path->basename;
if (path->is_dir)
flags |= FNM_LEADING_DIR;
}
if ((match->flags & GIT_ATTR_FNMATCH_DIRECTORY) && !path->is_dir) {
bool samename;
/*
* for attribute checks or checks at the root of this match's
* containing_dir (or root of the repository if no containing_dir),
* do not match.
*/
if (!(match->flags & GIT_ATTR_FNMATCH_IGNORE) ||
path->basename == relpath)
return false;
flags |= FNM_LEADING_DIR;
/* fail match if this is a file with same name as ignored folder */
samename = (match->flags & GIT_ATTR_FNMATCH_ICASE) ?
!strcasecmp(match->pattern, relpath) :
!strcmp(match->pattern, relpath);
if (samename)
return false;
return (p_fnmatch(match->pattern, relpath, flags) != FNM_NOMATCH);
}
/* if path is a directory prefix of a negated pattern, then match */
if ((match->flags & GIT_ATTR_FNMATCH_NEGATIVE) && path->is_dir) {
size_t pathlen = strlen(relpath);
bool prefixed = (pathlen <= match->length) &&
((match->flags & GIT_ATTR_FNMATCH_ICASE) ?
!strncasecmp(match->pattern, relpath, pathlen) :
!strncmp(match->pattern, relpath, pathlen));
if (prefixed && git_path_at_end_of_segment(&match->pattern[pathlen]))
return true;
}
return (p_fnmatch(match->pattern, filename, flags) != FNM_NOMATCH);
}
bool git_attr_rule__match(
git_attr_rule *rule,
git_attr_path *path)
{
bool matched = git_attr_fnmatch__match(&rule->match, path);
if (rule->match.flags & GIT_ATTR_FNMATCH_NEGATIVE)
matched = !matched;
return matched;
}
git_attr_assignment *git_attr_rule__lookup_assignment(
git_attr_rule *rule, const char *name)
{
size_t pos;
git_attr_name key;
key.name = name;
key.name_hash = git_attr_file__name_hash(name);
if (git_vector_bsearch(&pos, &rule->assigns, &key))
return NULL;
return git_vector_get(&rule->assigns, pos);
}
int git_attr_path__init(
git_attr_path *info, const char *path, const char *base, git_dir_flag dir_flag)
{
ssize_t root;
/* build full path as best we can */
git_buf_init(&info->full, 0);
if (git_path_join_unrooted(&info->full, path, base, &root) < 0)
return -1;
info->path = info->full.ptr + root;
/* remove trailing slashes */
while (info->full.size > 0) {
if (info->full.ptr[info->full.size - 1] != '/')
break;
info->full.size--;
}
info->full.ptr[info->full.size] = '\0';
/* skip leading slashes in path */
while (*info->path == '/')
info->path++;
/* find trailing basename component */
info->basename = strrchr(info->path, '/');
if (info->basename)
info->basename++;
if (!info->basename || !*info->basename)
info->basename = info->path;
switch (dir_flag)
{
case GIT_DIR_FLAG_FALSE:
info->is_dir = 0;
break;
case GIT_DIR_FLAG_TRUE:
info->is_dir = 1;
break;
case GIT_DIR_FLAG_UNKNOWN:
default:
info->is_dir = (int)git_path_isdir(info->full.ptr);
break;
}
return 0;
}
void git_attr_path__free(git_attr_path *info)
{
git_buf_dispose(&info->full);
info->path = NULL;
info->basename = NULL;
}
/*
* From gitattributes(5):
*
* Patterns have the following format:
*
* - A blank line matches no files, so it can serve as a separator for
* readability.
*
* - A line starting with # serves as a comment.
*
* - An optional prefix ! which negates the pattern; any matching file
* excluded by a previous pattern will become included again. If a negated
* pattern matches, this will override lower precedence patterns sources.
*
* - If the pattern ends with a slash, it is removed for the purpose of the
* following description, but it would only find a match with a directory. In
* other words, foo/ will match a directory foo and paths underneath it, but
* will not match a regular file or a symbolic link foo (this is consistent
* with the way how pathspec works in general in git).
*
* - If the pattern does not contain a slash /, git treats it as a shell glob
* pattern and checks for a match against the pathname without leading
* directories.
*
* - Otherwise, git treats the pattern as a shell glob suitable for consumption
* by fnmatch(3) with the FNM_PATHNAME flag: wildcards in the pattern will
* not match a / in the pathname. For example, "Documentation/\*.html" matches
* "Documentation/git.html" but not "Documentation/ppc/ppc.html". A leading
* slash matches the beginning of the pathname; for example, "/\*.c" matches
* "cat-file.c" but not "mozilla-sha1/sha1.c".
*/
/*
* This will return 0 if the spec was filled out,
* GIT_ENOTFOUND if the fnmatch does not require matching, or
* another error code there was an actual problem.
*/
int git_attr_fnmatch__parse(
git_attr_fnmatch *spec,
git_pool *pool,
const char *context,
const char **base)
{
const char *pattern, *scan;
int slash_count, allow_space;
assert(spec && base && *base);
if (parse_optimized_patterns(spec, pool, *base))
return 0;
spec->flags = (spec->flags & GIT_ATTR_FNMATCH__INCOMING);
allow_space = ((spec->flags & GIT_ATTR_FNMATCH_ALLOWSPACE) != 0);
pattern = *base;
while (git__isspace(*pattern)) pattern++;
if (!*pattern || *pattern == '#') {
*base = git__next_line(pattern);
return GIT_ENOTFOUND;
}
if (*pattern == '[' && (spec->flags & GIT_ATTR_FNMATCH_ALLOWMACRO) != 0) {
if (strncmp(pattern, "[attr]", 6) == 0) {
spec->flags = spec->flags | GIT_ATTR_FNMATCH_MACRO;
pattern += 6;
}
/* else a character range like [a-e]* which is accepted */
}
if (*pattern == '!' && (spec->flags & GIT_ATTR_FNMATCH_ALLOWNEG) != 0) {
spec->flags = spec->flags | GIT_ATTR_FNMATCH_NEGATIVE;
if ((spec->flags & GIT_ATTR_FNMATCH_NOLEADINGDIR) == 0)
spec->flags |= GIT_ATTR_FNMATCH_LEADINGDIR;
pattern++;
}
slash_count = 0;
for (scan = pattern; *scan != '\0'; ++scan) {
/* scan until (non-escaped) white space */
if (git__isspace(*scan) && *(scan - 1) != '\\') {
if (!allow_space || (*scan != ' ' && *scan != '\t' && *scan != '\r'))
break;
}
if (*scan == '/') {
spec->flags = spec->flags | GIT_ATTR_FNMATCH_FULLPATH;
slash_count++;
if (pattern == scan)
pattern++;
}
/* remember if we see an unescaped wildcard in pattern */
else if (git__iswildcard(*scan) &&
(scan == pattern || (*(scan - 1) != '\\')))
spec->flags = spec->flags | GIT_ATTR_FNMATCH_HASWILD;
}
*base = scan;
if ((spec->length = scan - pattern) == 0)
return GIT_ENOTFOUND;
/*
* Remove one trailing \r in case this is a CRLF delimited
* file, in the case of Icon\r\r\n, we still leave the first
* \r there to match against.
*/
if (pattern[spec->length - 1] == '\r')
if (--spec->length == 0)
return GIT_ENOTFOUND;
/* Remove trailing spaces. */
while (pattern[spec->length - 1] == ' ' || pattern[spec->length - 1] == '\t')
if (--spec->length == 0)
return GIT_ENOTFOUND;
if (pattern[spec->length - 1] == '/') {
spec->length--;
spec->flags = spec->flags | GIT_ATTR_FNMATCH_DIRECTORY;
if (--slash_count <= 0)
spec->flags = spec->flags & ~GIT_ATTR_FNMATCH_FULLPATH;
}
if ((spec->flags & GIT_ATTR_FNMATCH_NOLEADINGDIR) == 0 &&
spec->length >= 2 &&
pattern[spec->length - 1] == '*' &&
pattern[spec->length - 2] == '/') {
spec->length -= 2;
spec->flags = spec->flags | GIT_ATTR_FNMATCH_LEADINGDIR;
/* leave FULLPATH match on, however */
}
if (context) {
char *slash = strrchr(context, '/');
size_t len;
if (slash) {
/* include the slash for easier matching */
len = slash - context + 1;
spec->containing_dir = git_pool_strndup(pool, context, len);
spec->containing_dir_length = len;
}
}
spec->pattern = git_pool_strndup(pool, pattern, spec->length);
if (!spec->pattern) {
*base = git__next_line(pattern);
return -1;
} else {
/* strip '\' that might have be used for internal whitespace */
spec->length = git__unescape(spec->pattern);
/* TODO: convert remaining '\' into '/' for POSIX ??? */
}
return 0;
}
static bool parse_optimized_patterns(
git_attr_fnmatch *spec,
git_pool *pool,
const char *pattern)
{
if (!pattern[1] && (pattern[0] == '*' || pattern[0] == '.')) {
spec->flags = GIT_ATTR_FNMATCH_MATCH_ALL;
spec->pattern = git_pool_strndup(pool, pattern, 1);
spec->length = 1;
return true;
}
return false;
}
static int sort_by_hash_and_name(const void *a_raw, const void *b_raw)
{
const git_attr_name *a = a_raw;
const git_attr_name *b = b_raw;
if (b->name_hash < a->name_hash)
return 1;
else if (b->name_hash > a->name_hash)
return -1;
else
return strcmp(b->name, a->name);
}
static void git_attr_assignment__free(git_attr_assignment *assign)
{
/* name and value are stored in a git_pool associated with the
* git_attr_file, so they do not need to be freed here
*/
assign->name = NULL;
assign->value = NULL;
git__free(assign);
}
static int merge_assignments(void **old_raw, void *new_raw)
{
git_attr_assignment **old = (git_attr_assignment **)old_raw;
git_attr_assignment *new = (git_attr_assignment *)new_raw;
GIT_REFCOUNT_DEC(*old, git_attr_assignment__free);
*old = new;
return GIT_EEXISTS;
}
int git_attr_assignment__parse(
git_repository *repo,
git_pool *pool,
git_vector *assigns,
const char **base)
{
int error;
const char *scan = *base;
git_attr_assignment *assign = NULL;
assert(assigns && !assigns->length);
git_vector_set_cmp(assigns, sort_by_hash_and_name);
while (*scan && *scan != '\n') {
const char *name_start, *value_start;
/* skip leading blanks */
while (git__isspace(*scan) && *scan != '\n') scan++;
/* allocate assign if needed */
if (!assign) {
assign = git__calloc(1, sizeof(git_attr_assignment));
GIT_ERROR_CHECK_ALLOC(assign);
GIT_REFCOUNT_INC(assign);
}
assign->name_hash = 5381;
assign->value = git_attr__true;
/* look for magic name prefixes */
if (*scan == '-') {
assign->value = git_attr__false;
scan++;
} else if (*scan == '!') {
assign->value = git_attr__unset; /* explicit unspecified state */
scan++;
} else if (*scan == '#') /* comment rest of line */
break;
/* find the name */
name_start = scan;
while (*scan && !git__isspace(*scan) && *scan != '=') {
assign->name_hash =
((assign->name_hash << 5) + assign->name_hash) + *scan;
scan++;
}
if (scan == name_start) {
/* must have found lone prefix (" - ") or leading = ("=foo")
* or end of buffer -- advance until whitespace and continue
*/
while (*scan && !git__isspace(*scan)) scan++;
continue;
}
/* allocate permanent storage for name */
assign->name = git_pool_strndup(pool, name_start, scan - name_start);
GIT_ERROR_CHECK_ALLOC(assign->name);
/* if there is an equals sign, find the value */
if (*scan == '=') {
for (value_start = ++scan; *scan && !git__isspace(*scan); ++scan);
/* if we found a value, allocate permanent storage for it */
if (scan > value_start) {
assign->value = git_pool_strndup(pool, value_start, scan - value_start);
GIT_ERROR_CHECK_ALLOC(assign->value);
}
}
/* expand macros (if given a repo with a macro cache) */
if (repo != NULL && assign->value == git_attr__true) {
git_attr_rule *macro =
git_attr_cache__lookup_macro(repo, assign->name);
if (macro != NULL) {
unsigned int i;
git_attr_assignment *massign;
git_vector_foreach(¯o->assigns, i, massign) {
GIT_REFCOUNT_INC(massign);
error = git_vector_insert_sorted(
assigns, massign, &merge_assignments);
if (error < 0 && error != GIT_EEXISTS) {
git_attr_assignment__free(assign);
return error;
}
}
}
}
/* insert allocated assign into vector */
error = git_vector_insert_sorted(assigns, assign, &merge_assignments);
if (error < 0 && error != GIT_EEXISTS)
return error;
/* clear assign since it is now "owned" by the vector */
assign = NULL;
}
if (assign != NULL)
git_attr_assignment__free(assign);
*base = git__next_line(scan);
return (assigns->length == 0) ? GIT_ENOTFOUND : 0;
}
static void git_attr_rule__clear(git_attr_rule *rule)
{
unsigned int i;
git_attr_assignment *assign;
if (!rule)
return;
if (!(rule->match.flags & GIT_ATTR_FNMATCH_IGNORE)) {
git_vector_foreach(&rule->assigns, i, assign)
GIT_REFCOUNT_DEC(assign, git_attr_assignment__free);
git_vector_free(&rule->assigns);
}
/* match.pattern is stored in a git_pool, so no need to free */
rule->match.pattern = NULL;
rule->match.length = 0;
}
void git_attr_rule__free(git_attr_rule *rule)
{
git_attr_rule__clear(rule);
git__free(rule);
}
int git_attr_session__init(git_attr_session *session, git_repository *repo)
{
assert(repo);
session->key = git_atomic_inc(&repo->attr_session_key);
return 0;
}
void git_attr_session__free(git_attr_session *session)
{
if (!session)
return;
git_buf_dispose(&session->sysdir);
git_buf_dispose(&session->tmp);
memset(session, 0, sizeof(git_attr_session));
}
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