![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/convert.c b/convert.c
index 5fdaee75714fa6a42601fbb366aeafb18f3334fb..4b26b1a9b9979c2a7753afdad107c73f3e1aae4c 100644 (file)
--- a/convert.c
+++ b/convert.c
unsigned long size, nsize;
struct text_stat stats;
- if ((action == CRLF_BINARY) || (action == CRLF_GUESS && !auto_crlf))
+ if ((action == CRLF_BINARY) || !auto_crlf)
return NULL;
size = *sizep;
@@ -154,7 +154,7 @@ static char *crlf_to_worktree(const char *path, const char *src, unsigned long *
unsigned char last;
if ((action == CRLF_BINARY) || (action == CRLF_INPUT) ||
- (action == CRLF_GUESS && auto_crlf <= 0))
+ auto_crlf <= 0)
return NULL;
size = *sizep;
@@ -201,23 +201,218 @@ static char *crlf_to_worktree(const char *path, const char *src, unsigned long *
return buffer;
}
+static int filter_buffer(const char *path, const char *src,
+ unsigned long size, const char *cmd)
+{
+ /*
+ * Spawn cmd and feed the buffer contents through its stdin.
+ */
+ struct child_process child_process;
+ int pipe_feed[2];
+ int write_err, status;
+
+ 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 char *apply_filter(const char *path, const char *src,
+ unsigned long *sizep, const char *cmd)
+{
+ /*
+ * Create a pipeline to have the command filter the buffer's
+ * contents.
+ *
+ * (child --> cmd) --> us
+ */
+ const int SLOP = 4096;
+ int pipe_feed[2];
+ int status;
+ char *dst;
+ unsigned long dstsize, dstalloc;
+ struct child_process child_process;
+
+ if (!cmd)
+ return NULL;
+
+ memset(&child_process, 0, sizeof(child_process));
+
+ if (pipe(pipe_feed) < 0) {
+ error("cannot create pipe to run external filter %s", cmd);
+ return NULL;
+ }
+
+ 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 NULL;
+ }
+ if (!child_process.pid) {
+ dup2(pipe_feed[1], 1);
+ close(pipe_feed[0]);
+ close(pipe_feed[1]);
+ exit(filter_buffer(path, src, *sizep, cmd));
+ }
+ close(pipe_feed[1]);
+
+ dstalloc = *sizep;
+ dst = xmalloc(dstalloc);
+ dstsize = 0;
+
+ while (1) {
+ ssize_t numread = xread(pipe_feed[0], dst + dstsize,
+ dstalloc - dstsize);
+
+ if (numread <= 0) {
+ if (!numread)
+ break;
+ error("read from external filter %s failed", cmd);
+ free(dst);
+ dst = NULL;
+ break;
+ }
+ dstsize += numread;
+ if (dstalloc <= dstsize + SLOP) {
+ dstalloc = dstsize + SLOP;
+ dst = xrealloc(dst, dstalloc);
+ }
+ }
+ if (close(pipe_feed[0])) {
+ error("read from external filter %s failed", cmd);
+ free(dst);
+ dst = NULL;
+ }
+
+ status = finish_command(&child_process);
+ if (status) {
+ error("external filter %s failed %d", cmd, -status);
+ free(dst);
+ dst = NULL;
+ }
+
+ if (dst)
+ *sizep = dstsize;
+ return dst;
+}
+
+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;
+
+ /*
+ * 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) {
+ char *namebuf;
+ drv = xcalloc(1, sizeof(struct convert_driver));
+ namebuf = xmalloc(namelen + 1);
+ memcpy(namebuf, name, namelen);
+ namebuf[namelen] = 0;
+ drv->name = namebuf;
+ drv->next = NULL;
+ *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_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) {
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)
{
/*
- * "$ident: 0000000000000000000000000000000000000000 $" <=> "$ident$"
+ * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
*/
int cnt = 0;
char ch;
size--;
if (ch != '$')
continue;
- if (size < 6)
+ if (size < 3)
break;
- if (memcmp("ident", cp, 5))
+ if (memcmp("Id", cp, 2))
continue;
- ch = cp[5];
- cp += 6;
- size -= 6;
+ ch = cp[2];
+ cp += 3;
+ size -= 3;
if (ch == '$')
- cnt++; /* $ident$ */
+ cnt++; /* $Id$ */
if (ch != ':')
continue;
/*
- * "$ident: ... "; scan up to the closing dollar sign and discard.
+ * "$Id: ... "; scan up to the closing dollar sign and discard.
*/
while (size) {
ch = *cp++;
@@ -271,10 +466,10 @@ static char *ident_to_git(const char *path, const char *src, unsigned long *size
for (dst = buf; size; size--) {
char ch = *src++;
*dst++ = ch;
- if ((ch == '$') && (6 <= size) &&
- !memcmp("ident:", src, 6)) {
- unsigned long rem = size - 6;
- const char *cp = src + 6;
+ if ((ch == '$') && (3 <= size) &&
+ !memcmp("Id:", src, 3)) {
+ unsigned long rem = size - 3;
+ const char *cp = src + 3;
do {
ch = *cp++;
if (ch == '$')
@@ -283,8 +478,8 @@ static char *ident_to_git(const char *path, const char *src, unsigned long *size
} while (rem);
if (!rem)
continue;
- memcpy(dst, "ident$", 6);
- dst += 6;
+ memcpy(dst, "Id$", 3);
+ dst += 3;
size -= (cp - src);
src = cp;
}
@@ -316,13 +511,13 @@ static char *ident_to_worktree(const char *path, const char *src, unsigned long
const char *cp;
char ch = *src++;
*dst++ = ch;
- if ((ch != '$') || (size < 6) || memcmp("ident", src, 5))
+ if ((ch != '$') || (size < 3) || memcmp("Id", src, 2))
continue;
- if (src[5] == ':') {
+ if (src[2] == ':') {
/* discard up to but not including the closing $ */
- unsigned long rem = size - 6;
- cp = src + 6;
+ unsigned long rem = size - 3;
+ cp = src + 3;
do {
ch = *cp++;
if (ch == '$')
@@ -332,13 +527,13 @@ static char *ident_to_worktree(const char *path, const char *src, unsigned long
if (!rem)
continue;
size -= (cp - src);
- } else if (src[5] == '$')
- cp = src + 5;
+ } else if (src[2] == '$')
+ cp = src + 2;
else
continue;
- memcpy(dst, "ident: ", 7);
- dst += 7;
+ memcpy(dst, "Id: ", 4);
+ dst += 4;
memcpy(dst, sha1_to_hex(sha1), 40);
dst += 40;
*dst++ = ' ';
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;
@@ -376,18 +585,29 @@ static int git_path_check_ident(const char *path, struct git_attr_check *check)
char *convert_to_git(const char *path, const char *src, unsigned long *sizep)
{
- struct git_attr_check check[2];
+ struct git_attr_check check[3];
int crlf = CRLF_GUESS;
int ident = 0;
+ char *filter = NULL;
char *buf, *buf2;
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;
}
- buf = crlf_to_git(path, src, sizep, crlf);
+ buf = apply_filter(path, src, sizep, filter);
+
+ buf2 = crlf_to_git(path, buf ? buf : src, sizep, crlf);
+ if (buf2) {
+ free(buf);
+ buf = buf2;
+ }
buf2 = ident_to_git(path, buf ? buf : src, sizep, ident);
if (buf2) {
char *convert_to_working_tree(const char *path, const char *src, unsigned long *sizep)
{
- struct git_attr_check check[2];
+ struct git_attr_check check[3];
int crlf = CRLF_GUESS;
int ident = 0;
+ char *filter = NULL;
char *buf, *buf2;
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;
}
buf = ident_to_worktree(path, src, sizep, ident);
@@ -419,5 +644,26 @@ char *convert_to_working_tree(const char *path, const char *src, unsigned long *
buf = buf2;
}
+ buf2 = apply_filter(path, buf ? buf : src, sizep, filter);
+ if (buf2) {
+ free(buf);
+ buf = buf2;
+ }
+
return buf;
}
+
+void *convert_sha1_file(const char *path, const unsigned char *sha1,
+ unsigned int mode, enum object_type *type,
+ unsigned long *size)
+{
+ void *buffer = read_sha1_file(sha1, type, size);
+ if (S_ISREG(mode) && buffer) {
+ void *converted = convert_to_working_tree(path, buffer, size);
+ if (converted) {
+ free(buffer);
+ buffer = converted;
+ }
+ }
+ return buffer;
+}