#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;
}
-int convert_to_git(const char *path, char **bufp, unsigned long *sizep)
+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;
- /*
- * FIXME! Other pluggable conversions should go here,
- * based on filename patterns. Right now we just do the
- * stupid auto-CRLF one.
- */
- if (!auto_crlf)
+ if ((action == CRLF_BINARY) || !auto_crlf || !len)
return 0;
- size = *sizep;
- if (!size)
+ gather_stats(src, len, &stats);
+ /* No CR? Nothing to convert, regardless. */
+ if (!stats.cr)
return 0;
- buffer = *bufp;
- gather_stats(buffer, size, &stats);
+ 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
+ * stuff?
+ */
+ if (stats.cr != stats.crlf)
+ return 0;
- /* No CR? Nothing to convert, regardless. */
- if (!stats.cr)
+ /*
+ * And add some heuristics for binary vs text, of course...
+ */
+ if (is_binary(len, &stats))
+ return 0;
+ }
+
+ /* only grow if not in place */
+ if (strbuf_avail(buf) + buf->len < len)
+ strbuf_grow(buf, len - 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 = *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, int action)
+{
+ char *to_free = NULL;
+ struct text_stat stats;
+
+ if ((action == CRLF_BINARY) || (action == CRLF_INPUT) ||
+ auto_crlf <= 0)
+ return 0;
+
+ if (!len)
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 (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(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;
+ const char *cmd;
+};
+
+static int filter_buffer(int fd, void *data)
+{
+ /*
+ * Spawn cmd and feed the buffer contents through its stdin.
+ */
+ struct child_process child_process;
+ struct filter_params *params = (struct filter_params *)data;
+ int write_err, status;
+ const char *argv[] = { "sh", "-c", params->cmd, NULL };
+
+ memset(&child_process, 0, sizeof(child_process));
+ child_process.argv = argv;
+ child_process.in = -1;
+ child_process.out = fd;
+
+ if (start_command(&child_process))
+ return error("cannot fork to run external filter %s", params->cmd);
+
+ write_err = (write_in_full(child_process.in, params->src, params->size) < 0);
+ if (close(child_process.in))
+ write_err = 1;
+ if (write_err)
+ error("cannot feed the input to external filter %s", params->cmd);
+
+ status = finish_command(&child_process);
+ if (status)
+ error("external filter %s failed %d", params->cmd, -status);
+ return (write_err || status);
+}
+
+static int apply_filter(const char *path, const char *src, size_t len,
+ struct strbuf *dst, const char *cmd)
+{
/*
- * We're currently not going to even try to convert stuff
- * that has bare CR characters. Does anybody do that crazy
- * stuff?
+ * Create a pipeline to have the command filter the buffer's
+ * contents.
+ *
+ * (child --> cmd) --> us
*/
- if (stats.cr != stats.crlf)
+ int ret = 1;
+ struct strbuf nbuf;
+ struct async async;
+ struct filter_params params;
+
+ if (!cmd)
return 0;
+ memset(&async, 0, sizeof(async));
+ async.proc = filter_buffer;
+ async.data = ¶ms;
+ params.src = src;
+ params.size = len;
+ params.cmd = cmd;
+
+ fflush(NULL);
+ if (start_async(&async))
+ return 0; /* error was already reported */
+
+ strbuf_init(&nbuf, 0);
+ 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;
+ char *smudge;
+ char *clean;
+} *user_convert, **user_convert_tail;
+
+static int read_convert_config(const char *var, const char *value)
+{
+ const char *ep, *name;
+ int namelen;
+ struct convert_driver *drv;
+
/*
- * And add some heuristics for binary vs text, of course...
+ * External conversion drivers are configured using
+ * "filter.<name>.variable".
*/
- if (is_binary(size, &stats))
+ 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++;
/*
- * Ok, allocate a new buffer, fill it in, and return true
- * to let the caller know that we switched buffers on it.
+ * filter.<name>.smudge and filter.<name>.clean specifies
+ * the command line:
+ *
+ * command-line
+ *
+ * The command-line will not be interpolated in any way.
*/
- nsize = size - stats.crlf;
- nbuf = xmalloc(nsize);
- *bufp = nbuf;
- *sizep = nsize;
- do {
- unsigned char c = *buffer++;
- if (c != '\r')
- *nbuf++ = c;
- } while (--size);
- return 1;
+ 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;
}
-int convert_to_working_tree(const char *path, char **bufp, unsigned long *sizep)
+static void setup_convert_check(struct git_attr_check *check)
{
- char *buffer, *nbuf;
- unsigned long size, nsize;
- struct text_stat stats;
- unsigned char last;
+ static struct git_attr *attr_crlf;
+ static struct git_attr *attr_ident;
+ static struct git_attr *attr_filter;
+
+ if (!attr_crlf) {
+ attr_crlf = git_attr("crlf", 4);
+ 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 count_ident(const char *cp, unsigned long size)
+{
/*
- * FIXME! Other pluggable conversions should go here,
- * based on filename patterns. Right now we just do the
- * stupid auto-CRLF one.
+ * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
*/
- if (auto_crlf <= 0)
- return 0;
+ int cnt = 0;
+ char ch;
- size = *sizep;
- if (!size)
- return 0;
- buffer = *bufp;
+ while (size) {
+ ch = *cp++;
+ size--;
+ if (ch != '$')
+ 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;
- gather_stats(buffer, size, &stats);
+ /*
+ * "$Id: ... "; scan up to the closing dollar sign and discard.
+ */
+ while (size) {
+ ch = *cp++;
+ size--;
+ if (ch == '$') {
+ cnt++;
+ break;
+ }
+ }
+ }
+ return cnt;
+}
- /* No LF? Nothing to convert, regardless. */
- if (!stats.lf)
- return 0;
+static int ident_to_git(const char *path, const char *src, size_t len,
+ struct strbuf *buf, int ident)
+{
+ char *dst, *dollar;
- /* Was it already in CRLF format? */
- if (stats.lf == stats.crlf)
+ if (!ident || !count_ident(src, len))
return 0;
- /* If we have any bare CR characters, we're not going to touch it */
- if (stats.cr != stats.crlf)
+ /* 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, '$', len);
+ if (!dollar)
+ break;
+ memcpy(dst, src, dollar + 1 - src);
+ dst += dollar + 1 - src;
+ len -= dollar + 1 - src;
+ src = dollar + 1;
+
+ if (len > 3 && !memcmp(src, "Id:", 3)) {
+ dollar = memchr(src + 3, '$', len - 3);
+ if (!dollar)
+ break;
+ memcpy(dst, "Id$", 3);
+ dst += 3;
+ len -= dollar + 1 - src;
+ src = dollar + 1;
+ }
+ }
+ memcpy(dst, src, len);
+ strbuf_setlen(buf, dst + len - buf->buf);
+ return 1;
+}
+
+static int ident_to_worktree(const char *path, const char *src, size_t len,
+ struct strbuf *buf, int ident)
+{
+ unsigned char sha1[20];
+ char *to_free = NULL, *dollar;
+ int cnt;
+
+ if (!ident)
return 0;
- if (is_binary(size, &stats))
+ cnt = count_ident(src, len);
+ if (!cnt)
return 0;
- /*
- * Ok, allocate a new buffer, fill it in, and return true
- * to let the caller know that we switched buffers on it.
- */
- nsize = size + stats.lf - stats.crlf;
- nbuf = xmalloc(nsize);
- *bufp = nbuf;
- *sizep = nsize;
- last = 0;
- do {
- unsigned char c = *buffer++;
- if (c == '\n' && last != '\r')
- *nbuf++ = '\r';
- *nbuf++ = c;
- last = c;
- } while (--size);
+ /* are we "faking" in place editing ? */
+ if (src == buf->buf)
+ to_free = strbuf_detach(buf, NULL);
+ hash_sha1_file(src, len, "blob", sha1);
+
+ strbuf_grow(buf, len + cnt * 43);
+ for (;;) {
+ /* step 1: run to the next '$' */
+ 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);
+}