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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 "common.h"
#include "fileops.h"
#include "hash.h"
#include "filter.h"
#include "repository.h"
#include "global.h"
#include "git2/sys/filter.h"
#include "git2/config.h"
#include "blob.h"
#include "attr_file.h"
#include "array.h"
struct git_filter_source {
git_repository *repo;
const char *path;
git_oid oid; /* zero if unknown (which is likely) */
uint16_t filemode; /* zero if unknown */
git_filter_mode_t mode;
uint32_t options;
};
typedef struct {
git_filter *filter;
void *payload;
} git_filter_entry;
struct git_filter_list {
git_array_t(git_filter_entry) filters;
git_filter_source source;
char path[GIT_FLEX_ARRAY];
};
typedef struct {
char *filter_name;
git_filter *filter;
int priority;
int initialized;
size_t nattrs, nmatches;
char *attrdata;
const char *attrs[GIT_FLEX_ARRAY];
} git_filter_def;
static int filter_def_priority_cmp(const void *a, const void *b)
{
int pa = ((const git_filter_def *)a)->priority;
int pb = ((const git_filter_def *)b)->priority;
return (pa < pb) ? -1 : (pa > pb) ? 1 : 0;
}
struct filter_registry {
git_vector filters;
};
static struct filter_registry *git__filter_registry = NULL;
static void filter_registry_shutdown(void)
{
struct filter_registry *reg = NULL;
size_t pos;
git_filter_def *fdef;
if ((reg = git__swap(git__filter_registry, NULL)) == NULL)
return;
git_vector_foreach(®->filters, pos, fdef) {
if (fdef->filter && fdef->filter->shutdown) {
fdef->filter->shutdown(fdef->filter);
fdef->initialized = false;
}
git__free(fdef->filter_name);
git__free(fdef->attrdata);
git__free(fdef);
}
git_vector_free(®->filters);
git__free(reg);
}
static int filter_registry_initialize(void)
{
int error = 0;
struct filter_registry *reg;
if (git__filter_registry)
return 0;
reg = git__calloc(1, sizeof(struct filter_registry));
GITERR_CHECK_ALLOC(reg);
if ((error = git_vector_init(
®->filters, 2, filter_def_priority_cmp)) < 0)
goto cleanup;
reg = git__compare_and_swap(&git__filter_registry, NULL, reg);
if (reg != NULL)
goto cleanup;
git__on_shutdown(filter_registry_shutdown);
/* try to register both default filters */
{
git_filter *crlf = git_crlf_filter_new();
git_filter *ident = git_ident_filter_new();
if (crlf && git_filter_register(
GIT_FILTER_CRLF, crlf, GIT_FILTER_CRLF_PRIORITY) < 0)
crlf = NULL;
if (ident && git_filter_register(
GIT_FILTER_IDENT, ident, GIT_FILTER_IDENT_PRIORITY) < 0)
ident = NULL;
if (!crlf || !ident)
return -1;
}
return 0;
cleanup:
git_vector_free(®->filters);
git__free(reg);
return error;
}
static int filter_def_scan_attrs(
git_buf *attrs, size_t *nattr, size_t *nmatch, const char *attr_str)
{
const char *start, *scan = attr_str;
int has_eq;
*nattr = *nmatch = 0;
if (!scan)
return 0;
while (*scan) {
while (git__isspace(*scan)) scan++;
for (start = scan, has_eq = 0; *scan && !git__isspace(*scan); ++scan) {
if (*scan == '=')
has_eq = 1;
}
if (scan > start) {
(*nattr)++;
if (has_eq || *start == '-' || *start == '+' || *start == '!')
(*nmatch)++;
if (has_eq)
git_buf_putc(attrs, '=');
git_buf_put(attrs, start, scan - start);
git_buf_putc(attrs, '\0');
}
}
return 0;
}
static void filter_def_set_attrs(git_filter_def *fdef)
{
char *scan = fdef->attrdata;
size_t i;
for (i = 0; i < fdef->nattrs; ++i) {
const char *name, *value;
switch (*scan) {
case '=':
name = scan + 1;
for (scan++; *scan != '='; scan++) /* find '=' */;
*scan++ = '\0';
value = scan;
break;
case '-':
name = scan + 1; value = git_attr__false; break;
case '+':
name = scan + 1; value = git_attr__true; break;
case '!':
name = scan + 1; value = git_attr__unset; break;
default:
name = scan; value = NULL; break;
}
fdef->attrs[i] = name;
fdef->attrs[i + fdef->nattrs] = value;
scan += strlen(scan) + 1;
}
}
static int filter_def_name_key_check(const void *key, const void *fdef)
{
const char *name =
fdef ? ((const git_filter_def *)fdef)->filter_name : NULL;
return name ? git__strcmp(key, name) : -1;
}
static int filter_def_filter_key_check(const void *key, const void *fdef)
{
const void *filter = fdef ? ((const git_filter_def *)fdef)->filter : NULL;
return (key == filter) ? 0 : -1;
}
static int filter_registry_find(size_t *pos, const char *name)
{
return git_vector_search2(
pos, &git__filter_registry->filters, filter_def_name_key_check, name);
}
static git_filter_def *filter_registry_lookup(size_t *pos, const char *name)
{
git_filter_def *fdef = NULL;
if (!filter_registry_find(pos, name))
fdef = git_vector_get(&git__filter_registry->filters, *pos);
return fdef;
}
int git_filter_register(
const char *name, git_filter *filter, int priority)
{
git_filter_def *fdef;
size_t nattr = 0, nmatch = 0;
git_buf attrs = GIT_BUF_INIT;
assert(name && filter);
if (filter_registry_initialize() < 0)
return -1;
if (!filter_registry_find(NULL, name)) {
giterr_set(
GITERR_FILTER, "Attempt to reregister existing filter '%s'", name);
return GIT_EEXISTS;
}
if (filter_def_scan_attrs(&attrs, &nattr, &nmatch, filter->attributes) < 0)
return -1;
fdef = git__calloc(
sizeof(git_filter_def) + 2 * nattr * sizeof(char *), 1);
GITERR_CHECK_ALLOC(fdef);
fdef->filter_name = git__strdup(name);
GITERR_CHECK_ALLOC(fdef->filter_name);
fdef->filter = filter;
fdef->priority = priority;
fdef->nattrs = nattr;
fdef->nmatches = nmatch;
fdef->attrdata = git_buf_detach(&attrs);
filter_def_set_attrs(fdef);
if (git_vector_insert(&git__filter_registry->filters, fdef) < 0) {
git__free(fdef->filter_name);
git__free(fdef->attrdata);
git__free(fdef);
return -1;
}
git_vector_sort(&git__filter_registry->filters);
return 0;
}
int git_filter_unregister(const char *name)
{
size_t pos;
git_filter_def *fdef;
assert(name);
/* cannot unregister default filters */
if (!strcmp(GIT_FILTER_CRLF, name) || !strcmp(GIT_FILTER_IDENT, name)) {
giterr_set(GITERR_FILTER, "Cannot unregister filter '%s'", name);
return -1;
}
if ((fdef = filter_registry_lookup(&pos, name)) == NULL) {
giterr_set(GITERR_FILTER, "Cannot find filter '%s' to unregister", name);
return GIT_ENOTFOUND;
}
(void)git_vector_remove(&git__filter_registry->filters, pos);
if (fdef->initialized && fdef->filter && fdef->filter->shutdown) {
fdef->filter->shutdown(fdef->filter);
fdef->initialized = false;
}
git__free(fdef->filter_name);
git__free(fdef->attrdata);
git__free(fdef);
return 0;
}
static int filter_initialize(git_filter_def *fdef)
{
int error = 0;
if (!fdef->initialized &&
fdef->filter &&
fdef->filter->initialize &&
(error = fdef->filter->initialize(fdef->filter)) < 0)
{
/* auto-unregister if initialize fails */
git_filter_unregister(fdef->filter_name);
return error;
}
fdef->initialized = true;
return 0;
}
git_filter *git_filter_lookup(const char *name)
{
size_t pos;
git_filter_def *fdef;
if (filter_registry_initialize() < 0)
return NULL;
if ((fdef = filter_registry_lookup(&pos, name)) == NULL)
return NULL;
if (!fdef->initialized && filter_initialize(fdef) < 0)
return NULL;
return fdef->filter;
}
void git_filter_free(git_filter *filter)
{
git__free(filter);
}
git_repository *git_filter_source_repo(const git_filter_source *src)
{
return src->repo;
}
const char *git_filter_source_path(const git_filter_source *src)
{
return src->path;
}
uint16_t git_filter_source_filemode(const git_filter_source *src)
{
return src->filemode;
}
const git_oid *git_filter_source_id(const git_filter_source *src)
{
return git_oid_iszero(&src->oid) ? NULL : &src->oid;
}
git_filter_mode_t git_filter_source_mode(const git_filter_source *src)
{
return src->mode;
}
uint32_t git_filter_source_options(const git_filter_source *src)
{
return src->options;
}
static int filter_list_new(
git_filter_list **out, const git_filter_source *src)
{
git_filter_list *fl = NULL;
size_t pathlen = src->path ? strlen(src->path) : 0;
fl = git__calloc(1, sizeof(git_filter_list) + pathlen + 1);
GITERR_CHECK_ALLOC(fl);
if (src->path)
memcpy(fl->path, src->path, pathlen);
fl->source.repo = src->repo;
fl->source.path = fl->path;
fl->source.mode = src->mode;
fl->source.options = src->options;
*out = fl;
return 0;
}
static int filter_list_check_attributes(
const char ***out, git_filter_def *fdef, const git_filter_source *src)
{
int error;
size_t i;
const char **strs = git__calloc(fdef->nattrs, sizeof(const char *));
GITERR_CHECK_ALLOC(strs);
error = git_attr_get_many(
strs, src->repo, 0, src->path, fdef->nattrs, fdef->attrs);
/* if no values were found but no matches are needed, it's okay! */
if (error == GIT_ENOTFOUND && !fdef->nmatches) {
giterr_clear();
git__free((void *)strs);
return 0;
}
for (i = 0; !error && i < fdef->nattrs; ++i) {
const char *want = fdef->attrs[fdef->nattrs + i];
git_attr_t want_type, found_type;
if (!want)
continue;
want_type = git_attr_value(want);
found_type = git_attr_value(strs[i]);
if (want_type != found_type ||
(want_type == GIT_ATTR_VALUE_T && strcmp(want, strs[i])))
error = GIT_ENOTFOUND;
}
if (error)
git__free((void *)strs);
else
*out = strs;
return error;
}
int git_filter_list_new(
git_filter_list **out,
git_repository *repo,
git_filter_mode_t mode,
uint32_t options)
{
git_filter_source src = { 0 };
src.repo = repo;
src.path = NULL;
src.mode = mode;
src.options = options;
return filter_list_new(out, &src);
}
int git_filter_list_load(
git_filter_list **filters,
git_repository *repo,
git_blob *blob, /* can be NULL */
const char *path,
git_filter_mode_t mode,
uint32_t options)
{
int error = 0;
git_filter_list *fl = NULL;
git_filter_source src = { 0 };
git_filter_entry *fe;
size_t idx;
git_filter_def *fdef;
if (filter_registry_initialize() < 0)
return -1;
src.repo = repo;
src.path = path;
src.mode = mode;
src.options = options;
if (blob)
git_oid_cpy(&src.oid, git_blob_id(blob));
git_vector_foreach(&git__filter_registry->filters, idx, fdef) {
const char **values = NULL;
void *payload = NULL;
if (!fdef || !fdef->filter)
continue;
if (fdef->nattrs > 0) {
error = filter_list_check_attributes(&values, fdef, &src);
if (error == GIT_ENOTFOUND) {
error = 0;
continue;
} else if (error < 0)
break;
}
if (!fdef->initialized && (error = filter_initialize(fdef)) < 0)
break;
if (fdef->filter->check)
error = fdef->filter->check(
fdef->filter, &payload, &src, values);
git__free((void *)values);
if (error == GIT_PASSTHROUGH)
error = 0;
else if (error < 0)
break;
else {
if (!fl && (error = filter_list_new(&fl, &src)) < 0)
return error;
fe = git_array_alloc(fl->filters);
GITERR_CHECK_ALLOC(fe);
fe->filter = fdef->filter;
fe->payload = payload;
}
}
if (error && fl != NULL) {
git_array_clear(fl->filters);
git__free(fl);
fl = NULL;
}
*filters = fl;
return error;
}
void git_filter_list_free(git_filter_list *fl)
{
uint32_t i;
if (!fl)
return;
for (i = 0; i < git_array_size(fl->filters); ++i) {
git_filter_entry *fe = git_array_get(fl->filters, i);
if (fe->filter->cleanup)
fe->filter->cleanup(fe->filter, fe->payload);
}
git_array_clear(fl->filters);
git__free(fl);
}
int git_filter_list_push(
git_filter_list *fl, git_filter *filter, void *payload)
{
int error = 0;
size_t pos;
git_filter_def *fdef;
git_filter_entry *fe;
assert(fl && filter);
if (git_vector_search2(
&pos, &git__filter_registry->filters,
filter_def_filter_key_check, filter) < 0) {
giterr_set(GITERR_FILTER, "Cannot use an unregistered filter");
return -1;
}
fdef = git_vector_get(&git__filter_registry->filters, pos);
if (!fdef->initialized && (error = filter_initialize(fdef)) < 0)
return error;
fe = git_array_alloc(fl->filters);
GITERR_CHECK_ALLOC(fe);
fe->filter = filter;
fe->payload = payload;
return 0;
}
size_t git_filter_list_length(const git_filter_list *fl)
{
return fl ? git_array_size(fl->filters) : 0;
}
static int filter_list_out_buffer_from_raw(
git_buf *out, const void *ptr, size_t size)
{
if (git_buf_is_allocated(out))
git_buf_free(out);
if (!size) {
git_buf_init(out, 0);
} else {
out->ptr = (char *)ptr;
out->asize = 0;
out->size = size;
}
return 0;
}
int git_filter_list_apply_to_data(
git_buf *tgt, git_filter_list *fl, git_buf *src)
{
int error = 0;
uint32_t i;
git_buf *dbuffer[2], local = GIT_BUF_INIT;
unsigned int si = 0;
git_buf_sanitize(tgt);
git_buf_sanitize(src);
if (!fl)
return filter_list_out_buffer_from_raw(tgt, src->ptr, src->size);
dbuffer[0] = src;
dbuffer[1] = tgt;
/* if `src` buffer is reallocable, then use it, otherwise copy it */
if (!git_buf_is_allocated(src)) {
if (git_buf_set(&local, src->ptr, src->size) < 0)
return -1;
dbuffer[0] = &local;
}
for (i = 0; i < git_array_size(fl->filters); ++i) {
unsigned int di = 1 - si;
uint32_t fidx = (fl->source.mode == GIT_FILTER_TO_WORKTREE) ?
i : git_array_size(fl->filters) - 1 - i;
git_filter_entry *fe = git_array_get(fl->filters, fidx);
dbuffer[di]->size = 0;
/* Apply the filter from dbuffer[src] to the other buffer;
* if the filtering is canceled by the user mid-filter,
* we skip to the next filter without changing the source
* of the double buffering (so that the text goes through
* cleanly).
*/
error = fe->filter->apply(
fe->filter, &fe->payload, dbuffer[di], dbuffer[si], &fl->source);
if (error == GIT_PASSTHROUGH) {
/* PASSTHROUGH means filter decided not to process the buffer */
error = 0;
} else if (!error) {
git_buf_sanitize(dbuffer[di]); /* force NUL termination */
si = di; /* swap buffers */
} else {
tgt->size = 0;
goto cleanup;
}
}
/* Ensure that the output ends up in dbuffer[1] (i.e. the dest) */
if (si != 1)
git_buf_swap(dbuffer[0], dbuffer[1]);
cleanup:
git_buf_free(&local); /* don't leak if we allocated locally */
return error;
}
int git_filter_list_apply_to_file(
git_buf *out,
git_filter_list *filters,
git_repository *repo,
const char *path)
{
int error;
const char *base = repo ? git_repository_workdir(repo) : NULL;
git_buf abspath = GIT_BUF_INIT, raw = GIT_BUF_INIT;
if (!(error = git_path_join_unrooted(&abspath, path, base, NULL)) &&
!(error = git_futils_readbuffer(&raw, abspath.ptr)))
{
error = git_filter_list_apply_to_data(out, filters, &raw);
git_buf_free(&raw);
}
git_buf_free(&abspath);
return error;
}
int git_filter_list_apply_to_blob(
git_buf *out,
git_filter_list *filters,
git_blob *blob)
{
git_buf in = GIT_BUF_INIT;
git_off_t rawsize = git_blob_rawsize(blob);
if (!git__is_sizet(rawsize)) {
giterr_set(GITERR_OS, "Blob is too large to filter");
return -1;
}
in.ptr = (char *)git_blob_rawcontent(blob);
in.asize = 0;
in.size = (size_t)rawsize;
if (filters)
git_oid_cpy(&filters->source.oid, git_blob_id(blob));
return git_filter_list_apply_to_data(out, filters, &in);
}
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