pretend-git/convert.c at master · submitgit/pretend-git · GitHub

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#include "cache.h"

#include "attr.h"

#include "run-command.h"

#include "quote.h"

#include "sigchain.h"

* convert.c - convert a file when checking it out and checking it in.

* This should use the pathname to decide on whether it wants to do some

* more interesting conversions (automatic gzip/unzip, general format

* conversions etc etc), but by default it just does automatic CRLF<->LF

* translation when the "text" attribute or "auto_crlf" option is set.

enum crlf_action {

CRLF_GUESS = -1,

CRLF_BINARY = 0,

CRLF_TEXT,

CRLF_INPUT,

CRLF_CRLF,

CRLF_AUTO

};

struct text_stat {

/* NUL, CR, LF and CRLF counts */

unsigned nul, cr, lf, crlf;

/* These are just approximations! */

unsigned printable, nonprintable;

};

static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)

{

unsigned long i;

memset(stats, 0, sizeof(*stats));

for (i = 0; i < size; i++) {

unsigned char c = buf[i];

if (c == '\r') {

stats->cr++;

if (i+1 < size && buf[i+1] == '\n')

stats->crlf++;

continue;

}

if (c == '\n') {

stats->lf++;

continue;

}

if (c == 127)

/* DEL */

stats->nonprintable++;

else if (c < 32) {

switch (c) {

/* BS, HT, ESC and FF */

case '\b': case '\t': case '\033': case '\014':

stats->printable++;

break;

case 0:

stats->nul++;

/* fall through */

default:

stats->nonprintable++;

}

else

stats->printable++;

}

/* If file ends with EOF then don't count this EOF as non-printable. */

if (size >= 1 && buf[size-1] == '\032')

stats->nonprintable--;

}

* The same heuristics as diff.c::mmfile_is_binary()

static int is_binary(unsigned long size, struct text_stat *stats)

{

if (stats->nul)

return 1;

if ((stats->printable >> 7) < stats->nonprintable)

return 1;

* Other heuristics? Average line length might be relevant,

* as might LF vs CR vs CRLF counts..

* NOTE! It might be normal to have a low ratio of CRLF to LF

* (somebody starts with a LF-only file and edits it with an editor

* that adds CRLF only to lines that are added..). But do we

* want to support CR-only? Probably not.

return 0;

}

static enum eol output_eol(enum crlf_action crlf_action)

{

switch (crlf_action) {

case CRLF_BINARY:

return EOL_UNSET;

case CRLF_CRLF:

return EOL_CRLF;

case CRLF_INPUT:

return EOL_LF;

case CRLF_GUESS:

if (!auto_crlf)

return EOL_UNSET;

/* fall through */

case CRLF_TEXT:

case CRLF_AUTO:

if (auto_crlf == AUTO_CRLF_TRUE)

return EOL_CRLF;

else if (auto_crlf == AUTO_CRLF_INPUT)

return EOL_LF;

else if (core_eol == EOL_UNSET)

return EOL_NATIVE;

}

return core_eol;

}

static void check_safe_crlf(const char *path, enum crlf_action crlf_action,

struct text_stat *stats, enum safe_crlf checksafe)

{

if (!checksafe)

return;

if (output_eol(crlf_action) == EOL_LF) {

* CRLFs would not be restored by checkout:

* check if we'd remove CRLFs

if (stats->crlf) {

if (checksafe == SAFE_CRLF_WARN)

warning("CRLF will be replaced by LF in %s.\nThe file will have its original line endings in your working directory.", path);

else /* i.e. SAFE_CRLF_FAIL */

die("CRLF would be replaced by LF in %s.", path);

}

} else if (output_eol(crlf_action) == EOL_CRLF) {

* CRLFs would be added by checkout:

* check if we have "naked" LFs

if (stats->lf != stats->crlf) {

if (checksafe == SAFE_CRLF_WARN)

warning("LF will be replaced by CRLF in %s.\nThe file will have its original line endings in your working directory.", path);

else /* i.e. SAFE_CRLF_FAIL */

die("LF would be replaced by CRLF in %s", path);

}

static int has_cr_in_index(const char *path)

{

unsigned long sz;

void *data;

int has_cr;

data = read_blob_data_from_cache(path, &sz);

if (!data)

return 0;

has_cr = memchr(data, '\r', sz) != NULL;

free(data);

return has_cr;

}

static int crlf_to_git(const char *path, const char *src, size_t len,

struct strbuf *buf,

enum crlf_action crlf_action, enum safe_crlf checksafe)

{

struct text_stat stats;

char *dst;

if (crlf_action == CRLF_BINARY ||

(crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) ||

(src && !len))

return 0;

* If we are doing a dry-run and have no source buffer, there is

* nothing to analyze; we must assume we would convert.

if (!buf && !src)

return 1;

gather_stats(src, len, &stats);

if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {

* 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 0;

* And add some heuristics for binary vs text, of course...

if (is_binary(len, &stats))

return 0;

if (crlf_action == 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(path))

return 0;

}

check_safe_crlf(path, crlf_action, &stats, checksafe);

/* Optimization: No CR? Nothing to convert, regardless. */

if (!stats.cr)

return 0;

* At this point all of our source analysis is done, and we are sure we

* would convert. If we are in dry-run mode, we can give an answer.

if (!buf)

return 1;

/* only grow if not in place */

if (strbuf_avail(buf) + buf->len < len)

strbuf_grow(buf, len - buf->len);

dst = buf->buf;

if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {

* If we guessed, we already know we rejected a file with

* lone CR, and we can strip a CR without looking at what

* follow it.

do {

unsigned char c = *src++;

if (c != '\r')

*dst++ = c;

} while (--len);

} else {

do {

unsigned char c = *src++;

if (! (c == '\r' && (1 < len && *src == '\n')))

*dst++ = c;

} while (--len);

}

strbuf_setlen(buf, dst - buf->buf);

return 1;

}

static int crlf_to_worktree(const char *path, const char *src, size_t len,

struct strbuf *buf, enum crlf_action crlf_action)

{

char *to_free = NULL;

struct text_stat stats;

if (!len || output_eol(crlf_action) != EOL_CRLF)

return 0;

gather_stats(src, len, &stats);

/* No LF? Nothing to convert, regardless. */

if (!stats.lf)

return 0;

/* Was it already in CRLF format? */

if (stats.lf == stats.crlf)

return 0;

if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {

if (crlf_action == CRLF_GUESS) {

/* If we have any CR or CRLF line endings, we do not touch it */

/* This is the new safer autocrlf-handling */

if (stats.cr > 0 || stats.crlf > 0)

return 0;

}

/* If we have any bare CR characters, we're not going to touch it */

if (stats.cr != stats.crlf)

return 0;

if (is_binary(len, &stats))

return 0;

}

/* are we "faking" in place editing ? */

if (src == buf->buf)

to_free = strbuf_detach(buf, NULL);

strbuf_grow(buf, len + stats.lf - stats.crlf);

for (;;) {

const char *nl = memchr(src, '\n', len);

if (!nl)

break;

if (nl > src && nl[-1] == '\r') {

strbuf_add(buf, src, nl + 1 - src);

} else {

strbuf_add(buf, src, nl - src);

strbuf_addstr(buf, "\r\n");

}

len -= nl + 1 - src;

src = nl + 1;

}

strbuf_add(buf, src, len);

free(to_free);

return 1;

}

struct filter_params {

const char *src;

unsigned long size;

int fd;

const char *cmd;

const char *path;

};

static int filter_buffer_or_fd(int in, int out, void *data)

{

* Spawn cmd and feed the buffer contents through its stdin.

struct child_process child_process = CHILD_PROCESS_INIT;

struct filter_params *params = (struct filter_params *)data;

int write_err, status;

const char *argv[] = { NULL, NULL };

/* apply % substitution to cmd */

struct strbuf cmd = STRBUF_INIT;

struct strbuf path = STRBUF_INIT;

struct strbuf_expand_dict_entry dict[] = {

{ "f", NULL, },

{ NULL, NULL, },

};

/* quote the path to preserve spaces, etc. */

sq_quote_buf(&path, params->path);

dict[0].value = path.buf;

/* expand all %f with the quoted path */

strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict);

strbuf_release(&path);

argv[0] = cmd.buf;

child_process.argv = argv;

child_process.use_shell = 1;

child_process.in = -1;

child_process.out = out;

if (start_command(&child_process))

return error("cannot fork to run external filter %s", params->cmd);

sigchain_push(SIGPIPE, SIG_IGN);

if (params->src) {

write_err = (write_in_full(child_process.in, params->src, params->size) < 0);

} else {

write_err = copy_fd(params->fd, child_process.in);

}

if (close(child_process.in))

write_err = 1;

if (write_err)

error("cannot feed the input to external filter %s", params->cmd);

sigchain_pop(SIGPIPE);

status = finish_command(&child_process);

if (status)

error("external filter %s failed %d", params->cmd, status);

strbuf_release(&cmd);

return (write_err || status);

}

static int apply_filter(const char *path, const char *src, size_t len, int fd,

struct strbuf *dst, const char *cmd)

{

* Create a pipeline to have the command filter the buffer's

* contents.

* (child --> cmd) --> us

int ret = 1;

struct strbuf nbuf = STRBUF_INIT;

struct async async;

struct filter_params params;

if (!cmd)

return 0;

if (!dst)

return 1;

memset(&async, 0, sizeof(async));

async.proc = filter_buffer_or_fd;

async.data = &params;

async.out = -1;

params.src = src;

params.size = len;

params.fd = fd;

params.cmd = cmd;

params.path = path;

fflush(NULL);

if (start_async(&async))

return 0; /* error was already reported */

if (strbuf_read(&nbuf, async.out, len) < 0) {

error("read from external filter %s failed", cmd);

ret = 0;

}

if (close(async.out)) {

error("read from external filter %s failed", cmd);

ret = 0;

}

if (finish_async(&async)) {

error("external filter %s failed", cmd);

ret = 0;

}

if (ret) {

strbuf_swap(dst, &nbuf);

}

strbuf_release(&nbuf);

return ret;

}

static struct convert_driver {

const char *name;

struct convert_driver *next;

const char *smudge;

const char *clean;

int required;

} *user_convert, **user_convert_tail;

static int read_convert_config(const char *var, const char *value, void *cb)

{

const char *key, *name;

int namelen;

struct convert_driver *drv;

* External conversion drivers are configured using

* "filter.<name>.variable".

if (parse_config_key(var, "filter", &name, &namelen, &key) < 0 || !name)

return 0;

for (drv = user_convert; drv; drv = drv->next)

if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])

break;

if (!drv) {

drv = xcalloc(1, sizeof(struct convert_driver));

drv->name = xmemdupz(name, namelen);

*user_convert_tail = drv;

user_convert_tail = &(drv->next);

}

* filter.<name>.smudge and filter.<name>.clean specifies

* the command line:

* command-line

* The command-line will not be interpolated in any way.

if (!strcmp("smudge", key))

return git_config_string(&drv->smudge, var, value);

if (!strcmp("clean", key))

return git_config_string(&drv->clean, var, value);

if (!strcmp("required", key)) {

drv->required = git_config_bool(var, value);

return 0;

}

return 0;

}

static int count_ident(const char *cp, unsigned long size)

{

* "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"

int cnt = 0;

char ch;

while (size) {

ch = *cp++;

size--;

if (ch != '$')

continue;

if (size < 3)

break;

if (memcmp("Id", cp, 2))

continue;

ch = cp[2];

cp += 3;

size -= 3;

if (ch == '$')

cnt++; /* $Id$ */

if (ch != ':')

continue;

* "$Id: ... "; scan up to the closing dollar sign and discard.

while (size) {

ch = *cp++;

size--;

if (ch == '$') {

cnt++;

break;

}

if (ch == '\n')

break;

}

return cnt;

}

static int ident_to_git(const char *path, const char *src, size_t len,

struct strbuf *buf, int ident)

{

char *dst, *dollar;

if (!ident || (src && !count_ident(src, len)))

return 0;

if (!buf)

return 1;

/* only grow if not in place */

if (strbuf_avail(buf) + buf->len < len)

strbuf_grow(buf, len - buf->len);

dst = buf->buf;

for (;;) {

dollar = memchr(src, '$', len);

if (!dollar)

break;

memmove(dst, src, dollar + 1 - src);

dst += dollar + 1 - src;

len -= dollar + 1 - src;

src = dollar + 1;

if (len > 3 && !memcmp(src, "Id:", 3)) {

dollar = memchr(src + 3, '$', len - 3);

if (!dollar)

break;

if (memchr(src + 3, '\n', dollar - src - 3)) {

/* Line break before the next dollar. */

continue;

}

memcpy(dst, "Id$", 3);

dst += 3;

len -= dollar + 1 - src;

src = dollar + 1;

}

memmove(dst, src, len);

strbuf_setlen(buf, dst + len - buf->buf);

return 1;

}

static int ident_to_worktree(const char *path, const char *src, size_t len,

struct strbuf *buf, int ident)

{

unsigned char sha1[20];

char *to_free = NULL, *dollar, *spc;

int cnt;

if (!ident)

return 0;

cnt = count_ident(src, len);

if (!cnt)

return 0;

/* are we "faking" in place editing ? */

if (src == buf->buf)

to_free = strbuf_detach(buf, NULL);

hash_sha1_file(src, len, "blob", sha1);

strbuf_grow(buf, len + cnt * 43);

for (;;) {

/* step 1: run to the next '$' */

dollar = memchr(src, '$', len);

if (!dollar)

break;

strbuf_add(buf, src, dollar + 1 - src);

len -= dollar + 1 - src;

src = dollar + 1;

/* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */

if (len < 3 || memcmp("Id", src, 2))

continue;

/* step 3: skip over Id$ or Id:xxxxx$ */

if (src[2] == '$') {

src += 3;

len -= 3;

} else if (src[2] == ':') {

* It's possible that an expanded Id has crept its way into the

* repository, we cope with that by stripping the expansion out.

* This is probably not a good idea, since it will cause changes

* on checkout, which won't go away by stash, but let's keep it

* for git-style ids.

dollar = memchr(src + 3, '$', len - 3);

if (!dollar) {

/* incomplete keyword, no more '$', so just quit the loop */

break;

}

if (memchr(src + 3, '\n', dollar - src - 3)) {

/* Line break before the next dollar. */

continue;

}

spc = memchr(src + 4, ' ', dollar - src - 4);

if (spc && spc < dollar-1) {

/* There are spaces in unexpected places.

* This is probably an id from some other

* versioning system. Keep it for now.

continue;

}

len -= dollar + 1 - src;

src = dollar + 1;

} else {

/* it wasn't a "Id$" or "Id:xxxx$" */

continue;

}

/* step 4: substitute */

strbuf_addstr(buf, "Id: ");

strbuf_add(buf, sha1_to_hex(sha1), 40);

strbuf_addstr(buf, " $");

}

strbuf_add(buf, src, len);

free(to_free);

return 1;

}

static enum crlf_action git_path_check_crlf(const char *path, struct git_attr_check *check)

{

const char *value = check->value;

if (ATTR_TRUE(value))

return CRLF_TEXT;

else if (ATTR_FALSE(value))

return CRLF_BINARY;

else if (ATTR_UNSET(value))

;

else if (!strcmp(value, "input"))

return CRLF_INPUT;

else if (!strcmp(value, "auto"))

return CRLF_AUTO;

return CRLF_GUESS;

}

static enum eol git_path_check_eol(const char *path, struct git_attr_check *check)

{

const char *value = check->value;

if (ATTR_UNSET(value))

;

else if (!strcmp(value, "lf"))

return EOL_LF;

else if (!strcmp(value, "crlf"))

return EOL_CRLF;

return EOL_UNSET;

}

static struct convert_driver *git_path_check_convert(const char *path,

struct git_attr_check *check)

{

const char *value = check->value;

struct convert_driver *drv;

if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))

return NULL;

for (drv = user_convert; drv; drv = drv->next)

if (!strcmp(value, drv->name))

return drv;

return NULL;

}

static int git_path_check_ident(const char *path, struct git_attr_check *check)

{

const char *value = check->value;

return !!ATTR_TRUE(value);

}

static enum crlf_action input_crlf_action(enum crlf_action text_attr, enum eol eol_attr)

{

if (text_attr == CRLF_BINARY)

return CRLF_BINARY;

if (eol_attr == EOL_LF)

return CRLF_INPUT;

if (eol_attr == EOL_CRLF)

return CRLF_CRLF;

return text_attr;

}

struct conv_attrs {

struct convert_driver *drv;

enum crlf_action crlf_action;

enum eol eol_attr;

int ident;

};

static const char *conv_attr_name[] = {

"crlf", "ident", "filter", "eol", "text",

};

#define NUM_CONV_ATTRS ARRAY_SIZE(conv_attr_name)

static void convert_attrs(struct conv_attrs *ca, const char *path)

{

int i;

static struct git_attr_check ccheck[NUM_CONV_ATTRS];

if (!ccheck[0].attr) {

for (i = 0; i < NUM_CONV_ATTRS; i++)

ccheck[i].attr = git_attr(conv_attr_name[i]);

user_convert_tail = &user_convert;

git_config(read_convert_config, NULL);

}

if (!git_check_attr(path, NUM_CONV_ATTRS, ccheck)) {

ca->crlf_action = git_path_check_crlf(path, ccheck + 4);

if (ca->crlf_action == CRLF_GUESS)

ca->crlf_action = git_path_check_crlf(path, ccheck + 0);

ca->ident = git_path_check_ident(path, ccheck + 1);

ca->drv = git_path_check_convert(path, ccheck + 2);

ca->eol_attr = git_path_check_eol(path, ccheck + 3);

} else {

ca->drv = NULL;

ca->crlf_action = CRLF_GUESS;

ca->eol_attr = EOL_UNSET;

ca->ident = 0;

}

int would_convert_to_git_filter_fd(const char *path)

{

struct conv_attrs ca;

convert_attrs(&ca, path);

if (!ca.drv)

return 0;

* Apply a filter to an fd only if the filter is required to succeed.

* We must die if the filter fails, because the original data before

* filtering is not available.

if (!ca.drv->required)

return 0;

return apply_filter(path, NULL, 0, -1, NULL, ca.drv->clean);

}

int convert_to_git(const char *path, const char *src, size_t len,

struct strbuf *dst, enum safe_crlf checksafe)

{

int ret = 0;

const char *filter = NULL;

int required = 0;

struct conv_attrs ca;

convert_attrs(&ca, path);

if (ca.drv) {

filter = ca.drv->clean;

required = ca.drv->required;

}

ret |= apply_filter(path, src, len, -1, dst, filter);

if (!ret && required)

die("%s: clean filter '%s' failed", path, ca.drv->name);

if (ret && dst) {

src = dst->buf;

len = dst->len;

}

ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);

ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe);

if (ret && dst) {

src = dst->buf;

len = dst->len;

}

return ret | ident_to_git(path, src, len, dst, ca.ident);

}

void convert_to_git_filter_fd(const char *path, int fd, struct strbuf *dst,

enum safe_crlf checksafe)

{

struct conv_attrs ca;

convert_attrs(&ca, path);

assert(ca.drv);

assert(ca.drv->clean);

if (!apply_filter(path, NULL, 0, fd, dst, ca.drv->clean))

die("%s: clean filter '%s' failed", path, ca.drv->name);

ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);

crlf_to_git(path, dst->buf, dst->len, dst, ca.crlf_action, checksafe);

ident_to_git(path, dst->buf, dst->len, dst, ca.ident);

}

static int convert_to_working_tree_internal(const char *path, const char *src,

size_t len, struct strbuf *dst,

int normalizing)

{

int ret = 0, ret_filter = 0;

const char *filter = NULL;

int required = 0;

struct conv_attrs ca;

convert_attrs(&ca, path);

if (ca.drv) {

filter = ca.drv->smudge;

required = ca.drv->required;

}

ret |= ident_to_worktree(path, src, len, dst, ca.ident);

if (ret) {

src = dst->buf;

len = dst->len;

}

* CRLF conversion can be skipped if normalizing, unless there

* is a smudge filter. The filter might expect CRLFs.

if (filter || !normalizing) {

ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);

ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action);

if (ret) {

src = dst->buf;

len = dst->len;

}

ret_filter = apply_filter(path, src, len, -1, dst, filter);

if (!ret_filter && required)

die("%s: smudge filter %s failed", path, ca.drv->name);

return ret | ret_filter;

}

int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)

{

return convert_to_working_tree_internal(path, src, len, dst, 0);

}

int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst)

{

int ret = convert_to_working_tree_internal(path, src, len, dst, 1);

if (ret) {

src = dst->buf;

len = dst->len;

}

return ret | convert_to_git(path, src, len, dst, SAFE_CRLF_FALSE);

}

/*****************************************************************

* Streaming conversion support

*****************************************************************/

typedef int (*filter_fn)(struct stream_filter *,

const char *input, size_t *isize_p,

char *output, size_t *osize_p);

typedef void (*free_fn)(struct stream_filter *);

struct stream_filter_vtbl {

filter_fn filter;

free_fn free;

};

struct stream_filter {

struct stream_filter_vtbl *vtbl;

};

static int null_filter_fn(struct stream_filter *filter,

const char *input, size_t *isize_p,

char *output, size_t *osize_p)

{

size_t count;

if (!input)

return 0; /* we do not keep any states */

count = *isize_p;

if (*osize_p < count)

count = *osize_p;

if (count) {

memmove(output, input, count);

*isize_p -= count;

*osize_p -= count;

}

return 0;

}

static void null_free_fn(struct stream_filter *filter)

{

; /* nothing -- null instances are shared */

}

static struct stream_filter_vtbl null_vtbl = {

null_filter_fn,

null_free_fn,

};

static struct stream_filter null_filter_singleton = {

&null_vtbl,

};

int is_null_stream_filter(struct stream_filter *filter)

{

return filter == &null_filter_singleton;

}

* LF-to-CRLF filter

struct lf_to_crlf_filter {

struct stream_filter filter;

unsigned has_held:1;

char held;

};

static int lf_to_crlf_filter_fn(struct stream_filter *filter,

const char *input, size_t *isize_p,

char *output, size_t *osize_p)

{

size_t count, o = 0;

struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter;

* We may be holding onto the CR to see if it is followed by a

* LF, in which case we would need to go to the main loop.

* Otherwise, just emit it to the output stream.

if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) {

output[o++] = lf_to_crlf->held;

lf_to_crlf->has_held = 0;

}

/* We are told to drain */

if (!input) {

*osize_p -= o;

return 0;

}

count = *isize_p;

if (count || lf_to_crlf->has_held) {

size_t i;

int was_cr = 0;

if (lf_to_crlf->has_held) {

was_cr = 1;

lf_to_crlf->has_held = 0;

}

for (i = 0; o < *osize_p && i < count; i++) {

char ch = input[i];

if (ch == '\n') {

output[o++] = '\r';

} else if (was_cr) {

* Previous round saw CR and it is not followed

* by a LF; emit the CR before processing the

* current character.

output[o++] = '\r';

}

* We may have consumed the last output slot,

* in which case we need to break out of this

* loop; hold the current character before

* returning.

if (*osize_p <= o) {

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pretend-git/convert.c at master · submitgit/pretend-git · GitHub

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