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1024 lines (815 loc) · 21.8 KB
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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 flags;
};
typedef struct {
const char *filter_name;
git_filter *filter;
void *payload;
} git_filter_entry;
struct git_filter_list {
git_array_t(git_filter_entry) filters;
git_filter_source source;
git_buf *temp_buf;
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 git_filter_registry {
git_rwlock lock;
git_vector filters;
};
static struct git_filter_registry filter_registry;
static void git_filter_global_shutdown(void);
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;
}
/* Note: callers must lock the registry before calling this function */
static int filter_registry_insert(
const char *name, git_filter *filter, int priority)
{
git_filter_def *fdef;
size_t nattr = 0, nmatch = 0, alloc_len;
git_buf attrs = GIT_BUF_INIT;
if (filter_def_scan_attrs(&attrs, &nattr, &nmatch, filter->attributes) < 0)
return -1;
GITERR_CHECK_ALLOC_MULTIPLY(&alloc_len, nattr, 2);
GITERR_CHECK_ALLOC_MULTIPLY(&alloc_len, alloc_len, sizeof(char *));
GITERR_CHECK_ALLOC_ADD(&alloc_len, alloc_len, sizeof(git_filter_def));
fdef = git__calloc(1, alloc_len);
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(&filter_registry.filters, fdef) < 0) {
git__free(fdef->filter_name);
git__free(fdef->attrdata);
git__free(fdef);
return -1;
}
git_vector_sort(&filter_registry.filters);
return 0;
}
int git_filter_global_init(void)
{
git_filter *crlf = NULL, *ident = NULL;
int error = 0;
if (git_rwlock_init(&filter_registry.lock) < 0)
return -1;
if ((error = git_vector_init(&filter_registry.filters, 2,
filter_def_priority_cmp)) < 0)
goto done;
if ((crlf = git_crlf_filter_new()) == NULL ||
filter_registry_insert(
GIT_FILTER_CRLF, crlf, GIT_FILTER_CRLF_PRIORITY) < 0 ||
(ident = git_ident_filter_new()) == NULL ||
filter_registry_insert(
GIT_FILTER_IDENT, ident, GIT_FILTER_IDENT_PRIORITY) < 0)
error = -1;
git__on_shutdown(git_filter_global_shutdown);
done:
if (error) {
git_filter_free(crlf);
git_filter_free(ident);
}
return error;
}
static void git_filter_global_shutdown(void)
{
size_t pos;
git_filter_def *fdef;
if (git_rwlock_wrlock(&filter_registry.lock) < 0)
return;
git_vector_foreach(&filter_registry.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(&filter_registry.filters);
git_rwlock_wrunlock(&filter_registry.lock);
git_rwlock_free(&filter_registry.lock);
}
/* Note: callers must lock the registry before calling this function */
static int filter_registry_find(size_t *pos, const char *name)
{
return git_vector_search2(
pos, &filter_registry.filters, filter_def_name_key_check, name);
}
/* Note: callers must lock the registry before calling this function */
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(&filter_registry.filters, *pos);
return fdef;
}
int git_filter_register(
const char *name, git_filter *filter, int priority)
{
int error;
assert(name && filter);
if (git_rwlock_wrlock(&filter_registry.lock) < 0) {
giterr_set(GITERR_OS, "failed to lock filter registry");
return -1;
}
if (!filter_registry_find(NULL, name)) {
giterr_set(
GITERR_FILTER, "attempt to reregister existing filter '%s'", name);
error = GIT_EEXISTS;
goto done;
}
error = filter_registry_insert(name, filter, priority);
done:
git_rwlock_wrunlock(&filter_registry.lock);
return error;
}
int git_filter_unregister(const char *name)
{
size_t pos;
git_filter_def *fdef;
int error = 0;
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 (git_rwlock_wrlock(&filter_registry.lock) < 0) {
giterr_set(GITERR_OS, "failed to lock filter registry");
return -1;
}
if ((fdef = filter_registry_lookup(&pos, name)) == NULL) {
giterr_set(GITERR_FILTER, "cannot find filter '%s' to unregister", name);
error = GIT_ENOTFOUND;
goto done;
}
git_vector_remove(&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);
done:
git_rwlock_wrunlock(&filter_registry.lock);
return error;
}
static int filter_initialize(git_filter_def *fdef)
{
int error = 0;
if (!fdef->initialized && fdef->filter && fdef->filter->initialize) {
if ((error = fdef->filter->initialize(fdef->filter)) < 0)
return error;
}
fdef->initialized = true;
return 0;
}
git_filter *git_filter_lookup(const char *name)
{
size_t pos;
git_filter_def *fdef;
git_filter *filter = NULL;
if (git_rwlock_rdlock(&filter_registry.lock) < 0) {
giterr_set(GITERR_OS, "failed to lock filter registry");
return NULL;
}
if ((fdef = filter_registry_lookup(&pos, name)) == NULL ||
(!fdef->initialized && filter_initialize(fdef) < 0))
goto done;
filter = fdef->filter;
done:
git_rwlock_rdunlock(&filter_registry.lock);
return 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_flags(const git_filter_source *src)
{
return src->flags;
}
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, alloclen;
GITERR_CHECK_ALLOC_ADD(&alloclen, sizeof(git_filter_list), pathlen);
GITERR_CHECK_ALLOC_ADD(&alloclen, alloclen, 1);
fl = git__calloc(1, alloclen);
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.flags = src->flags;
*out = fl;
return 0;
}
static int filter_list_check_attributes(
const char ***out,
git_repository *repo,
git_attr_session *attr_session,
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_with_session(
strs, repo, attr_session, 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)
error = GIT_ENOTFOUND;
else if (want_type == GIT_ATTR_VALUE_T &&
strcmp(want, strs[i]) &&
strcmp(want, "*"))
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 flags)
{
git_filter_source src = { 0 };
src.repo = repo;
src.path = NULL;
src.mode = mode;
src.flags = flags;
return filter_list_new(out, &src);
}
int git_filter_list__load_ext(
git_filter_list **filters,
git_repository *repo,
git_blob *blob, /* can be NULL */
const char *path,
git_filter_mode_t mode,
git_filter_options *filter_opts)
{
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 (git_rwlock_rdlock(&filter_registry.lock) < 0) {
giterr_set(GITERR_OS, "failed to lock filter registry");
return -1;
}
src.repo = repo;
src.path = path;
src.mode = mode;
src.flags = filter_opts->flags;
if (blob)
git_oid_cpy(&src.oid, git_blob_id(blob));
git_vector_foreach(&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, repo, filter_opts->attr_session, 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) {
if ((error = filter_list_new(&fl, &src)) < 0)
break;
fl->temp_buf = filter_opts->temp_buf;
}
fe = git_array_alloc(fl->filters);
GITERR_CHECK_ALLOC(fe);
fe->filter = fdef->filter;
fe->filter_name = fdef->filter_name;
fe->payload = payload;
}
}
git_rwlock_rdunlock(&filter_registry.lock);
if (error && fl != NULL) {
git_array_clear(fl->filters);
git__free(fl);
fl = NULL;
}
*filters = fl;
return error;
}
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 flags)
{
git_filter_options filter_opts = GIT_FILTER_OPTIONS_INIT;
filter_opts.flags = flags;
return git_filter_list__load_ext(
filters, repo, blob, path, mode, &filter_opts);
}
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_contains(
git_filter_list *fl,
const char *name)
{
size_t i;
assert(name);
if (!fl)
return 0;
for (i = 0; i < fl->filters.size; i++) {
if (strcmp(fl->filters.ptr[i].filter_name, name) == 0)
return 1;
}
return 0;
}
int git_filter_list_push(
git_filter_list *fl, git_filter *filter, void *payload)
{
int error = 0;
size_t pos;
git_filter_def *fdef = NULL;
git_filter_entry *fe;
assert(fl && filter);
if (git_rwlock_rdlock(&filter_registry.lock) < 0) {
giterr_set(GITERR_OS, "failed to lock filter registry");
return -1;
}
if (git_vector_search2(
&pos, &filter_registry.filters,
filter_def_filter_key_check, filter) == 0)
fdef = git_vector_get(&filter_registry.filters, pos);
git_rwlock_rdunlock(&filter_registry.lock);
if (fdef == NULL) {
giterr_set(GITERR_FILTER, "cannot use an unregistered filter");
return -1;
}
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;
}
struct buf_stream {
git_writestream parent;
git_buf *target;
bool complete;
};
static int buf_stream_write(
git_writestream *s, const char *buffer, size_t len)
{
struct buf_stream *buf_stream = (struct buf_stream *)s;
assert(buf_stream);
assert(buf_stream->complete == 0);
return git_buf_put(buf_stream->target, buffer, len);
}
static int buf_stream_close(git_writestream *s)
{
struct buf_stream *buf_stream = (struct buf_stream *)s;
assert(buf_stream);
assert(buf_stream->complete == 0);
buf_stream->complete = 1;
return 0;
}
static void buf_stream_free(git_writestream *s)
{
GIT_UNUSED(s);
}
static void buf_stream_init(struct buf_stream *writer, git_buf *target)
{
memset(writer, 0, sizeof(struct buf_stream));
writer->parent.write = buf_stream_write;
writer->parent.close = buf_stream_close;
writer->parent.free = buf_stream_free;
writer->target = target;
git_buf_clear(target);
}
int git_filter_list_apply_to_data(
git_buf *tgt, git_filter_list *filters, git_buf *src)
{
struct buf_stream writer;
int error;
git_buf_sanitize(tgt);
git_buf_sanitize(src);
if (!filters) {
git_buf_attach_notowned(tgt, src->ptr, src->size);
return 0;
}
buf_stream_init(&writer, tgt);
if ((error = git_filter_list_stream_data(filters, src,
&writer.parent)) < 0)
return error;
assert(writer.complete);
return error;
}
int git_filter_list_apply_to_file(
git_buf *out,
git_filter_list *filters,
git_repository *repo,
const char *path)
{
struct buf_stream writer;
int error;
buf_stream_init(&writer, out);
if ((error = git_filter_list_stream_file(
filters, repo, path, &writer.parent)) < 0)
return error;
assert(writer.complete);
return error;
}
static int buf_from_blob(git_buf *out, git_blob *blob)
{
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;
}
git_buf_attach_notowned(out, git_blob_rawcontent(blob), (size_t)rawsize);
return 0;
}
int git_filter_list_apply_to_blob(
git_buf *out,
git_filter_list *filters,
git_blob *blob)
{
struct buf_stream writer;
int error;
buf_stream_init(&writer, out);
if ((error = git_filter_list_stream_blob(
filters, blob, &writer.parent)) < 0)
return error;
assert(writer.complete);
return error;
}
struct proxy_stream {
git_writestream parent;
git_filter *filter;
const git_filter_source *source;
void **payload;
git_buf input;
git_buf temp_buf;
git_buf *output;
git_writestream *target;
};
static int proxy_stream_write(
git_writestream *s, const char *buffer, size_t len)
{
struct proxy_stream *proxy_stream = (struct proxy_stream *)s;
assert(proxy_stream);
return git_buf_put(&proxy_stream->input, buffer, len);
}
static int proxy_stream_close(git_writestream *s)
{
struct proxy_stream *proxy_stream = (struct proxy_stream *)s;
git_buf *writebuf;
int error;
assert(proxy_stream);
error = proxy_stream->filter->apply(
proxy_stream->filter,
proxy_stream->payload,
proxy_stream->output,
&proxy_stream->input,
proxy_stream->source);
if (error == GIT_PASSTHROUGH) {
writebuf = &proxy_stream->input;
} else if (error == 0) {
git_buf_sanitize(proxy_stream->output);
writebuf = proxy_stream->output;
} else {
return error;
}
if ((error = proxy_stream->target->write(
proxy_stream->target, writebuf->ptr, writebuf->size)) == 0)
error = proxy_stream->target->close(proxy_stream->target);
return error;
}
static void proxy_stream_free(git_writestream *s)
{
struct proxy_stream *proxy_stream = (struct proxy_stream *)s;
assert(proxy_stream);
git_buf_free(&proxy_stream->input);
git_buf_free(&proxy_stream->temp_buf);
git__free(proxy_stream);
}
static int proxy_stream_init(
git_writestream **out,
git_filter *filter,
git_buf *temp_buf,
void **payload,
const git_filter_source *source,
git_writestream *target)
{
struct proxy_stream *proxy_stream = git__calloc(1, sizeof(struct proxy_stream));
GITERR_CHECK_ALLOC(proxy_stream);
proxy_stream->parent.write = proxy_stream_write;
proxy_stream->parent.close = proxy_stream_close;
proxy_stream->parent.free = proxy_stream_free;
proxy_stream->filter = filter;
proxy_stream->payload = payload;
proxy_stream->source = source;
proxy_stream->target = target;
proxy_stream->output = temp_buf ? temp_buf : &proxy_stream->temp_buf;
if (temp_buf)
git_buf_clear(temp_buf);
*out = (git_writestream *)proxy_stream;
return 0;
}
static int stream_list_init(
git_writestream **out,
git_vector *streams,
git_filter_list *filters,
git_writestream *target)
{
git_writestream *last_stream = target;
size_t i;
int error = 0;
*out = NULL;
if (!filters) {
*out = target;
return 0;
}
/* Create filters last to first to get the chaining direction */
for (i = 0; i < git_array_size(filters->filters); ++i) {
size_t filter_idx = (filters->source.mode == GIT_FILTER_TO_WORKTREE) ?
git_array_size(filters->filters) - 1 - i : i;
git_filter_entry *fe = git_array_get(filters->filters, filter_idx);
git_writestream *filter_stream;
assert(fe->filter->stream || fe->filter->apply);
/* If necessary, create a stream that proxies the traditional
* application.
*/
if (fe->filter->stream)
error = fe->filter->stream(&filter_stream, fe->filter,
&fe->payload, &filters->source, last_stream);
else
/* Create a stream that proxies the one-shot apply */
error = proxy_stream_init(&filter_stream, fe->filter,
filters->temp_buf, &fe->payload, &filters->source,
last_stream);
if (error < 0)
goto out;
git_vector_insert(streams, filter_stream);
last_stream = filter_stream;
}
out:
if (error)
last_stream->close(last_stream);
else
*out = last_stream;
return error;
}
void stream_list_free(git_vector *streams)
{
git_writestream *stream;
size_t i;
git_vector_foreach(streams, i, stream)
stream->free(stream);
git_vector_free(streams);
}
int git_filter_list_stream_file(
git_filter_list *filters,
git_repository *repo,
const char *path,
git_writestream *target)
{
char buf[FILTERIO_BUFSIZE];
git_buf abspath = GIT_BUF_INIT;
const char *base = repo ? git_repository_workdir(repo) : NULL;
git_vector filter_streams = GIT_VECTOR_INIT;
git_writestream *stream_start;
ssize_t readlen;
int fd = -1, error, initialized = 0;
if ((error = stream_list_init(
&stream_start, &filter_streams, filters, target)) < 0 ||
(error = git_path_join_unrooted(&abspath, path, base, NULL)) < 0)
goto done;
initialized = 1;
if ((fd = git_futils_open_ro(abspath.ptr)) < 0) {
error = fd;
goto done;
}
while ((readlen = p_read(fd, buf, sizeof(buf))) > 0) {
if ((error = stream_start->write(stream_start, buf, readlen)) < 0)
goto done;
}
if (readlen < 0)
error = readlen;
done:
if (initialized)
error |= stream_start->close(stream_start);
if (fd >= 0)
p_close(fd);
stream_list_free(&filter_streams);
git_buf_free(&abspath);
return error;
}
int git_filter_list_stream_data(
git_filter_list *filters,
git_buf *data,
git_writestream *target)
{
git_vector filter_streams = GIT_VECTOR_INIT;
git_writestream *stream_start;
int error, initialized = 0;
git_buf_sanitize(data);
if ((error = stream_list_init(&stream_start, &filter_streams, filters, target)) < 0)
goto out;
initialized = 1;
if ((error = stream_start->write(
stream_start, data->ptr, data->size)) < 0)
goto out;
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