Hash :
47e9a6cb
Author :
Date :
2015-06-08T15:58:54
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381
/*
* 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 "git2/attr.h"
#include "git2/blob.h"
#include "git2/index.h"
#include "git2/sys/filter.h"
#include "common.h"
#include "fileops.h"
#include "hash.h"
#include "filter.h"
#include "buf_text.h"
#include "repository.h"
struct crlf_attrs {
int crlf_action;
int eol;
int auto_crlf;
int safe_crlf;
};
struct crlf_filter {
git_filter f;
};
static int check_crlf(const char *value)
{
if (GIT_ATTR_TRUE(value))
return GIT_CRLF_TEXT;
if (GIT_ATTR_FALSE(value))
return GIT_CRLF_BINARY;
if (GIT_ATTR_UNSPECIFIED(value))
return GIT_CRLF_GUESS;
if (strcmp(value, "input") == 0)
return GIT_CRLF_INPUT;
if (strcmp(value, "auto") == 0)
return GIT_CRLF_AUTO;
return GIT_CRLF_GUESS;
}
static int check_eol(const char *value)
{
if (GIT_ATTR_UNSPECIFIED(value))
return GIT_EOL_UNSET;
if (strcmp(value, "lf") == 0)
return GIT_EOL_LF;
if (strcmp(value, "crlf") == 0)
return GIT_EOL_CRLF;
return GIT_EOL_UNSET;
}
static int crlf_input_action(struct crlf_attrs *ca)
{
if (ca->crlf_action == GIT_CRLF_BINARY)
return GIT_CRLF_BINARY;
if (ca->eol == GIT_EOL_LF)
return GIT_CRLF_INPUT;
if (ca->eol == GIT_EOL_CRLF)
return GIT_CRLF_CRLF;
return ca->crlf_action;
}
static int has_cr_in_index(const git_filter_source *src)
{
git_repository *repo = git_filter_source_repo(src);
const char *path = git_filter_source_path(src);
git_index *index;
const git_index_entry *entry;
git_blob *blob;
const void *blobcontent;
git_off_t blobsize;
bool found_cr;
if (!path)
return false;
if (git_repository_index__weakptr(&index, repo) < 0) {
giterr_clear();
return false;
}
if (!(entry = git_index_get_bypath(index, path, 0)) &&
!(entry = git_index_get_bypath(index, path, 1)))
return false;
if (!S_ISREG(entry->mode)) /* don't crlf filter non-blobs */
return true;
if (git_blob_lookup(&blob, repo, &entry->id) < 0)
return false;
blobcontent = git_blob_rawcontent(blob);
blobsize = git_blob_rawsize(blob);
if (!git__is_sizet(blobsize))
blobsize = (size_t)-1;
found_cr = (blobcontent != NULL &&
blobsize > 0 &&
memchr(blobcontent, '\r', (size_t)blobsize) != NULL);
git_blob_free(blob);
return found_cr;
}
static int crlf_apply_to_odb(
struct crlf_attrs *ca,
git_buf *to,
const git_buf *from,
const git_filter_source *src)
{
/* Empty file? Nothing to do */
if (!git_buf_len(from))
return 0;
/* Heuristics to see if we can skip the conversion.
* Straight from Core Git.
*/
if (ca->crlf_action == GIT_CRLF_AUTO || ca->crlf_action == GIT_CRLF_GUESS) {
git_buf_text_stats stats;
/* Check heuristics for binary vs text - returns true if binary */
if (git_buf_text_gather_stats(&stats, from, false))
return GIT_PASSTHROUGH;
/* If there are no CR characters to filter out, then just pass */
if (!stats.cr)
return GIT_PASSTHROUGH;
/* If safecrlf is enabled, sanity-check the result. */
if (stats.cr != stats.crlf || stats.lf != stats.crlf) {
switch (ca->safe_crlf) {
case GIT_SAFE_CRLF_FAIL:
giterr_set(
GITERR_FILTER, "LF would be replaced by CRLF in '%s'",
git_filter_source_path(src));
return -1;
case GIT_SAFE_CRLF_WARN:
/* TODO: issue warning when warning API is available */;
break;
default:
break;
}
}
/*
* We're currently not going to even try to convert stuff
* that has bare CR characters. Does anybody do that crazy
* stuff?
*/
if (stats.cr != stats.crlf)
return GIT_PASSTHROUGH;
if (ca->crlf_action == GIT_CRLF_GUESS) {
/*
* If the file in the index has any CR in it, do not convert.
* This is the new safer autocrlf handling.
*/
if (has_cr_in_index(src))
return GIT_PASSTHROUGH;
}
if (!stats.cr)
return GIT_PASSTHROUGH;
}
/* Actually drop the carriage returns */
return git_buf_text_crlf_to_lf(to, from);
}
static const char *line_ending(struct crlf_attrs *ca)
{
switch (ca->crlf_action) {
case GIT_CRLF_BINARY:
case GIT_CRLF_INPUT:
return "\n";
case GIT_CRLF_CRLF:
return "\r\n";
case GIT_CRLF_AUTO:
case GIT_CRLF_TEXT:
case GIT_CRLF_GUESS:
break;
default:
goto line_ending_error;
}
switch (ca->eol) {
case GIT_EOL_UNSET:
return GIT_EOL_NATIVE == GIT_EOL_CRLF ? "\r\n" : "\n";
case GIT_EOL_CRLF:
return "\r\n";
case GIT_EOL_LF:
return "\n";
default:
goto line_ending_error;
}
line_ending_error:
giterr_set(GITERR_INVALID, "Invalid input to line ending filter");
return NULL;
}
static int crlf_apply_to_workdir(
struct crlf_attrs *ca, git_buf *to, const git_buf *from)
{
git_buf_text_stats stats;
const char *workdir_ending = NULL;
bool is_binary;
/* Empty file? Nothing to do. */
if (git_buf_len(from) == 0)
return 0;
/* Determine proper line ending */
workdir_ending = line_ending(ca);
if (!workdir_ending)
return -1;
/* only LF->CRLF conversion is supported, do nothing on LF platforms */
if (strcmp(workdir_ending, "\r\n") != 0)
return GIT_PASSTHROUGH;
/* If there are no LFs, or all LFs are part of a CRLF, nothing to do */
is_binary = git_buf_text_gather_stats(&stats, from, false);
if (stats.lf == 0 || stats.lf == stats.crlf)
return GIT_PASSTHROUGH;
if (ca->crlf_action == GIT_CRLF_AUTO ||
ca->crlf_action == GIT_CRLF_GUESS) {
/* If we have any existing CR or CRLF line endings, do nothing */
if (ca->crlf_action == GIT_CRLF_GUESS &&
stats.cr > 0 && stats.crlf > 0)
return GIT_PASSTHROUGH;
/* If we have bare CR characters, do nothing */
if (stats.cr != stats.crlf)
return GIT_PASSTHROUGH;
/* Don't filter binary files */
if (is_binary)
return GIT_PASSTHROUGH;
}
return git_buf_text_lf_to_crlf(to, from);
}
static int crlf_check(
git_filter *self,
void **payload, /* points to NULL ptr on entry, may be set */
const git_filter_source *src,
const char **attr_values)
{
int error;
struct crlf_attrs ca;
GIT_UNUSED(self);
if (!attr_values) {
ca.crlf_action = GIT_CRLF_GUESS;
ca.eol = GIT_EOL_UNSET;
} else {
ca.crlf_action = check_crlf(attr_values[2]); /* text */
if (ca.crlf_action == GIT_CRLF_GUESS)
ca.crlf_action = check_crlf(attr_values[0]); /* clrf */
ca.eol = check_eol(attr_values[1]); /* eol */
}
ca.auto_crlf = GIT_AUTO_CRLF_DEFAULT;
/*
* Use the core Git logic to see if we should perform CRLF for this file
* based on its attributes & the value of `core.autocrlf`
*/
ca.crlf_action = crlf_input_action(&ca);
if (ca.crlf_action == GIT_CRLF_BINARY)
return GIT_PASSTHROUGH;
if (ca.crlf_action == GIT_CRLF_GUESS ||
(ca.crlf_action == GIT_CRLF_AUTO &&
git_filter_source_mode(src) == GIT_FILTER_SMUDGE)) {
error = git_repository__cvar(
&ca.auto_crlf, git_filter_source_repo(src), GIT_CVAR_AUTO_CRLF);
if (error < 0)
return error;
if (ca.crlf_action == GIT_CRLF_GUESS &&
ca.auto_crlf == GIT_AUTO_CRLF_FALSE)
return GIT_PASSTHROUGH;
if (ca.auto_crlf == GIT_AUTO_CRLF_INPUT &&
git_filter_source_mode(src) == GIT_FILTER_SMUDGE)
return GIT_PASSTHROUGH;
}
if (git_filter_source_mode(src) == GIT_FILTER_CLEAN) {
error = git_repository__cvar(
&ca.safe_crlf, git_filter_source_repo(src), GIT_CVAR_SAFE_CRLF);
if (error < 0)
return error;
/* downgrade FAIL to WARN if ALLOW_UNSAFE option is used */
if ((git_filter_source_flags(src) & GIT_FILTER_ALLOW_UNSAFE) &&
ca.safe_crlf == GIT_SAFE_CRLF_FAIL)
ca.safe_crlf = GIT_SAFE_CRLF_WARN;
}
*payload = git__malloc(sizeof(ca));
GITERR_CHECK_ALLOC(*payload);
memcpy(*payload, &ca, sizeof(ca));
return 0;
}
static int crlf_apply(
git_filter *self,
void **payload, /* may be read and/or set */
git_buf *to,
const git_buf *from,
const git_filter_source *src)
{
/* initialize payload in case `check` was bypassed */
if (!*payload) {
int error = crlf_check(self, payload, src, NULL);
if (error < 0 && error != GIT_PASSTHROUGH)
return error;
}
if (git_filter_source_mode(src) == GIT_FILTER_SMUDGE)
return crlf_apply_to_workdir(*payload, to, from);
else
return crlf_apply_to_odb(*payload, to, from, src);
}
static void crlf_cleanup(
git_filter *self,
void *payload)
{
GIT_UNUSED(self);
git__free(payload);
}
git_filter *git_crlf_filter_new(void)
{
struct crlf_filter *f = git__calloc(1, sizeof(struct crlf_filter));
if (f == NULL)
return NULL;
f->f.version = GIT_FILTER_VERSION;
f->f.attributes = "crlf eol text";
f->f.initialize = NULL;
f->f.shutdown = git_filter_free;
f->f.check = crlf_check;
f->f.apply = crlf_apply;
f->f.cleanup = crlf_cleanup;
return (git_filter *)f;
}