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crlf.c

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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 "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;

};

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->oid) < 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;

/*

* 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)

{

const char *workdir_ending = NULL;

/* Empty file? Nothing to do. */

if (git_buf_len(from) == 0)

return 0;

/* Don't filter binary files */

if (git_buf_text_is_binary(from))

return GIT_PASSTHROUGH;

/* Determine proper line ending */

workdir_ending = line_ending(ca);

if (!workdir_ending)

return -1;

if (!strcmp("\n", workdir_ending)) {

if (ca->crlf_action == GIT_CRLF_GUESS && ca->auto_crlf)

return GIT_PASSTHROUGH;

if (git_buf_find(from, '\r') < 0)

return GIT_PASSTHROUGH;

if (git_buf_text_crlf_to_lf(to, from) < 0)

return -1;

} else {

/* only other supported option is lf->crlf conversion */

assert(!strcmp("\r\n", workdir_ending));

if (git_buf_text_lf_to_crlf(to, from) < 0)

return -1;

}

return 0;

}

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) {

error = git_repository__cvar(

&ca.auto_crlf, git_filter_source_repo(src), GIT_CVAR_AUTO_CRLF);

if (error < 0)

return error;

if (ca.auto_crlf == GIT_AUTO_CRLF_FALSE)

return GIT_PASSTHROUGH;

}

*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));

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;

}