#include "cache.h"
#include "attr.h"
+#include "run-command.h"
/*
* convert.c - convert a file when checking it out and checking it in.
* translation when the "auto_crlf" option is set.
*/
+#define CRLF_GUESS (-1)
+#define CRLF_BINARY 0
+#define CRLF_TEXT 1
+#define CRLF_INPUT 2
+
struct text_stat {
/* CR, LF and CRLF counts */
unsigned cr, lf, crlf;
return 0;
}
-static int crlf_to_git(const char *path, char **bufp, unsigned long *sizep, int guess)
+static int crlf_to_git(const char *path, const char *src, size_t len,
+ struct strbuf *buf, int action)
{
- char *buffer, *nbuf;
- unsigned long size, nsize;
struct text_stat stats;
+ char *dst;
- if (guess && !auto_crlf)
- return 0;
-
- size = *sizep;
- if (!size)
+ if ((action == CRLF_BINARY) || !auto_crlf || !len)
return 0;
- buffer = *bufp;
-
- gather_stats(buffer, size, &stats);
+ gather_stats(src, len, &stats);
/* No CR? Nothing to convert, regardless. */
if (!stats.cr)
return 0;
- if (guess) {
+ if (action == CRLF_GUESS) {
/*
* We're currently not going to even try to convert stuff
* that has bare CR characters. Does anybody do that crazy
/*
* And add some heuristics for binary vs text, of course...
*/
- if (is_binary(size, &stats))
+ if (is_binary(len, &stats))
return 0;
}
- /*
- * Ok, allocate a new buffer, fill it in, and return true
- * to let the caller know that we switched buffers on it.
- */
- nsize = size - stats.crlf;
- nbuf = xmalloc(nsize);
- *bufp = nbuf;
- *sizep = nsize;
-
- if (guess) {
+ strbuf_grow(buf, len);
+ dst = buf->buf;
+ if (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 = *buffer++;
+ unsigned char c = *src++;
if (c != '\r')
- *nbuf++ = c;
- } while (--size);
+ *dst++ = c;
+ } while (--len);
} else {
do {
- unsigned char c = *buffer++;
- if (! (c == '\r' && (1 < size && *buffer == '\n')))
- *nbuf++ = c;
- } while (--size);
+ 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 autocrlf_to_git(const char *path, char **bufp, unsigned long *sizep)
-{
- return crlf_to_git(path, bufp, sizep, 1);
-}
-
-static int forcecrlf_to_git(const char *path, char **bufp, unsigned long *sizep)
-{
- return crlf_to_git(path, bufp, sizep, 0);
-}
-
-static int crlf_to_working_tree(const char *path, char **bufp, unsigned long *sizep, int guess)
+static int crlf_to_worktree(const char *path, const char *src, size_t len,
+ struct strbuf *buf, int action)
{
- char *buffer, *nbuf;
- unsigned long size, nsize;
+ char *to_free = NULL;
struct text_stat stats;
- unsigned char last;
- if (guess && auto_crlf <= 0)
+ if ((action == CRLF_BINARY) || (action == CRLF_INPUT) ||
+ auto_crlf <= 0)
return 0;
- size = *sizep;
- if (!size)
+ if (!len)
return 0;
- buffer = *bufp;
- gather_stats(buffer, size, &stats);
+ gather_stats(src, len, &stats);
/* No LF? Nothing to convert, regardless. */
if (!stats.lf)
if (stats.lf == stats.crlf)
return 0;
- if (guess) {
+ if (action == CRLF_GUESS) {
/* If we have any bare CR characters, we're not going to touch it */
if (stats.cr != stats.crlf)
return 0;
- if (is_binary(size, &stats))
+ 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;
+}
+
+static int filter_buffer(const char *path, const char *src,
+ unsigned long size, const char *cmd)
+{
/*
- * Ok, allocate a new buffer, fill it in, and return true
- * to let the caller know that we switched buffers on it.
+ * Spawn cmd and feed the buffer contents through its stdin.
*/
- nsize = size + stats.lf - stats.crlf;
- nbuf = xmalloc(nsize);
- *bufp = nbuf;
- *sizep = nsize;
- last = 0;
- do {
- unsigned char c = *buffer++;
- if (c == '\n' && last != '\r')
- *nbuf++ = '\r';
- *nbuf++ = c;
- last = c;
- } while (--size);
+ struct child_process child_process;
+ int pipe_feed[2];
+ int write_err, status;
- return 1;
+ memset(&child_process, 0, sizeof(child_process));
+
+ if (pipe(pipe_feed) < 0) {
+ error("cannot create pipe to run external filter %s", cmd);
+ return 1;
+ }
+
+ child_process.pid = fork();
+ if (child_process.pid < 0) {
+ error("cannot fork to run external filter %s", cmd);
+ close(pipe_feed[0]);
+ close(pipe_feed[1]);
+ return 1;
+ }
+ if (!child_process.pid) {
+ dup2(pipe_feed[0], 0);
+ close(pipe_feed[0]);
+ close(pipe_feed[1]);
+ execlp("sh", "sh", "-c", cmd, NULL);
+ return 1;
+ }
+ close(pipe_feed[0]);
+
+ write_err = (write_in_full(pipe_feed[1], src, size) < 0);
+ if (close(pipe_feed[1]))
+ write_err = 1;
+ if (write_err)
+ error("cannot feed the input to external filter %s", cmd);
+
+ status = finish_command(&child_process);
+ if (status)
+ error("external filter %s failed %d", cmd, -status);
+ return (write_err || status);
}
-static int autocrlf_to_working_tree(const char *path, char **bufp, unsigned long *sizep)
+static int apply_filter(const char *path, const char *src, size_t len,
+ struct strbuf *dst, const char *cmd)
{
- return crlf_to_working_tree(path, bufp, sizep, 1);
+ /*
+ * Create a pipeline to have the command filter the buffer's
+ * contents.
+ *
+ * (child --> cmd) --> us
+ */
+ int pipe_feed[2];
+ int status, ret = 1;
+ struct child_process child_process;
+ struct strbuf nbuf;
+
+ if (!cmd)
+ return 0;
+
+ memset(&child_process, 0, sizeof(child_process));
+
+ if (pipe(pipe_feed) < 0) {
+ error("cannot create pipe to run external filter %s", cmd);
+ return 0;
+ }
+
+ fflush(NULL);
+ child_process.pid = fork();
+ if (child_process.pid < 0) {
+ error("cannot fork to run external filter %s", cmd);
+ close(pipe_feed[0]);
+ close(pipe_feed[1]);
+ return 0;
+ }
+ if (!child_process.pid) {
+ dup2(pipe_feed[1], 1);
+ close(pipe_feed[0]);
+ close(pipe_feed[1]);
+ exit(filter_buffer(path, src, len, cmd));
+ }
+ close(pipe_feed[1]);
+
+ strbuf_init(&nbuf, 0);
+ if (strbuf_read(&nbuf, pipe_feed[0], len) < 0) {
+ error("read from external filter %s failed", cmd);
+ ret = 0;
+ }
+ if (close(pipe_feed[0])) {
+ ret = error("read from external filter %s failed", cmd);
+ ret = 0;
+ }
+ status = finish_command(&child_process);
+ if (status) {
+ ret = error("external filter %s failed %d", cmd, -status);
+ ret = 0;
+ }
+
+ if (ret) {
+ *dst = nbuf;
+ } else {
+ strbuf_release(&nbuf);
+ }
+ return ret;
}
-static int forcecrlf_to_working_tree(const char *path, char **bufp, unsigned long *sizep)
+static struct convert_driver {
+ const char *name;
+ struct convert_driver *next;
+ char *smudge;
+ char *clean;
+} *user_convert, **user_convert_tail;
+
+static int read_convert_config(const char *var, const char *value)
{
- return crlf_to_working_tree(path, bufp, sizep, 0);
+ const char *ep, *name;
+ int namelen;
+ struct convert_driver *drv;
+
+ /*
+ * External conversion drivers are configured using
+ * "filter.<name>.variable".
+ */
+ if (prefixcmp(var, "filter.") || (ep = strrchr(var, '.')) == var + 6)
+ return 0;
+ name = var + 7;
+ namelen = ep - name;
+ 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);
+ }
+
+ ep++;
+
+ /*
+ * 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", ep)) {
+ if (!value)
+ return error("%s: lacks value", var);
+ drv->smudge = strdup(value);
+ return 0;
+ }
+
+ if (!strcmp("clean", ep)) {
+ if (!value)
+ return error("%s: lacks value", var);
+ drv->clean = strdup(value);
+ return 0;
+ }
+ return 0;
}
-static void setup_crlf_check(struct git_attr_check *check)
+static void setup_convert_check(struct git_attr_check *check)
{
static struct git_attr *attr_crlf;
+ static struct git_attr *attr_ident;
+ static struct git_attr *attr_filter;
- if (!attr_crlf)
+ if (!attr_crlf) {
attr_crlf = git_attr("crlf", 4);
- check->attr = attr_crlf;
+ attr_ident = git_attr("ident", 5);
+ attr_filter = git_attr("filter", 6);
+ user_convert_tail = &user_convert;
+ git_config(read_convert_config);
+ }
+ check[0].attr = attr_crlf;
+ check[1].attr = attr_ident;
+ check[2].attr = attr_filter;
}
-static int git_path_check_crlf(const char *path)
+static int count_ident(const char *cp, unsigned long size)
{
- struct git_attr_check attr_crlf_check;
+ /*
+ * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
+ */
+ int cnt = 0;
+ char ch;
- setup_crlf_check(&attr_crlf_check);
+ while (size) {
+ ch = *cp++;
+ size--;
+ if (ch != '$')
+ 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;
- if (!git_checkattr(path, 1, &attr_crlf_check)) {
- void *value = attr_crlf_check.value;
- if (ATTR_TRUE(value))
- return 1;
- else if (ATTR_FALSE(value))
- return 0;
- else if (ATTR_UNSET(value))
- ;
- else
- die("unknown value %s given to 'crlf' attribute",
- (char *)value);
+ /*
+ * "$Id: ... "; scan up to the closing dollar sign and discard.
+ */
+ while (size) {
+ ch = *cp++;
+ size--;
+ if (ch == '$') {
+ cnt++;
+ break;
+ }
+ }
}
- return -1;
+ return cnt;
}
-int convert_to_git(const char *path, char **bufp, unsigned long *sizep)
+static int ident_to_git(const char *path, const char *src, size_t len,
+ struct strbuf *buf, int ident)
{
- switch (git_path_check_crlf(path)) {
- case 0:
+ char *dst, *dollar;
+
+ if (!ident || !count_ident(src, len))
return 0;
- case 1:
- return forcecrlf_to_git(path, bufp, sizep);
- default:
- return autocrlf_to_git(path, bufp, sizep);
+
+ strbuf_grow(buf, len);
+ dst = buf->buf;
+ for (;;) {
+ dollar = memchr(src, '$', len);
+ if (!dollar)
+ break;
+ memcpy(dst, src, dollar + 1 - src);
+ dst += dollar + 1 - src;
+ len -= dollar + 1 - src;
+ src = dollar + 1;
+
+ if (len > 3 && !memcmp(src, "Id:", 3)) {
+ dollar = memchr(src + 3, '$', len - 3);
+ if (!dollar)
+ break;
+ memcpy(dst, "Id$", 3);
+ dst += 3;
+ len -= dollar + 1 - src;
+ src = dollar + 1;
+ }
}
+ memcpy(dst, src, len);
+ strbuf_setlen(buf, dst + len - buf->buf);
+ return 1;
}
-int convert_to_working_tree(const char *path, char **bufp, unsigned long *sizep)
+static int ident_to_worktree(const char *path, const char *src, size_t len,
+ struct strbuf *buf, int ident)
{
- switch (git_path_check_crlf(path)) {
- case 0:
+ unsigned char sha1[20];
+ char *to_free = NULL, *dollar;
+ int cnt;
+
+ if (!ident)
+ return 0;
+
+ cnt = count_ident(src, len);
+ if (!cnt)
return 0;
- case 1:
- return forcecrlf_to_working_tree(path, bufp, sizep);
- default:
- return autocrlf_to_working_tree(path, bufp, sizep);
+
+ /* are we "faking" in place editing ? */
+ if (src == buf->buf)
+ to_free = strbuf_detach(buf, NULL);
+ hash_sha1_file(src, len, "blob", sha1);
+
+ strbuf_grow(buf, len + cnt * 43);
+ for (;;) {
+ /* step 1: run to the next '$' */
+ 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] == '$') {
+ src += 3;
+ len -= 3;
+ } else if (src[2] == ':') {
+ /*
+ * It's possible that an expanded Id has crept its way into the
+ * repository, we cope with that by stripping the expansion out
+ */
+ dollar = memchr(src + 3, '$', len - 3);
+ if (!dollar) {
+ /* incomplete keyword, no more '$', so just quit the loop */
+ break;
+ }
+
+ len -= dollar + 1 - src;
+ src = dollar + 1;
+ } else {
+ /* it wasn't a "Id$" 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 int 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;
+ return CRLF_GUESS;
+}
+
+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);
+}
+
+int convert_to_git(const char *path, const char *src, size_t len, struct strbuf *dst)
+{
+ struct git_attr_check check[3];
+ int crlf = CRLF_GUESS;
+ int ident = 0, ret = 0;
+ char *filter = NULL;
+
+ setup_convert_check(check);
+ if (!git_checkattr(path, ARRAY_SIZE(check), check)) {
+ struct convert_driver *drv;
+ crlf = git_path_check_crlf(path, check + 0);
+ ident = git_path_check_ident(path, check + 1);
+ drv = git_path_check_convert(path, check + 2);
+ if (drv && drv->clean)
+ filter = drv->clean;
+ }
+
+ ret |= apply_filter(path, src, len, dst, filter);
+ if (ret) {
+ src = dst->buf;
+ len = dst->len;
+ }
+ ret |= crlf_to_git(path, src, len, dst, crlf);
+ if (ret) {
+ src = dst->buf;
+ len = dst->len;
+ }
+ return ret | ident_to_git(path, src, len, dst, ident);
+}
+
+int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)
+{
+ struct git_attr_check check[3];
+ int crlf = CRLF_GUESS;
+ int ident = 0, ret = 0;
+ char *filter = NULL;
+
+ setup_convert_check(check);
+ if (!git_checkattr(path, ARRAY_SIZE(check), check)) {
+ struct convert_driver *drv;
+ crlf = git_path_check_crlf(path, check + 0);
+ ident = git_path_check_ident(path, check + 1);
+ drv = git_path_check_convert(path, check + 2);
+ if (drv && drv->smudge)
+ filter = drv->smudge;
+ }
+
+ ret |= ident_to_worktree(path, src, len, dst, ident);
+ if (ret) {
+ src = dst->buf;
+ len = dst->len;
+ }
+ ret |= crlf_to_worktree(path, src, len, dst, crlf);
+ if (ret) {
+ src = dst->buf;
+ len = dst->len;
}
+ return ret | apply_filter(path, src, len, dst, filter);
}