Don't support shell-quoted refnames in fast-import.

The current implementation of shell-style quoted refnames and
SHA-1 expressions within fast-import contains a bad memory leak.
We leak the unquoted strings used by the `from` and `merge`
commands, maybe others.  Its also just muddling up the docs.

Since Git refnames cannot contain LF, and that is our delimiter
for the end of the refname, and we accept any other character
as-is, there is no reason for these strings to support quoting,
except to be nice to frontends.  But frontends shouldn't be
expecting to use funny refs in Git, and its just as simple to
never quote them as it is to always pass them through the same
quoting filter as pathnames.  So frontends should never quote
refs, or ref expressions.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

1 files changed, 5 insertions, 62 deletions

diff --git a/fast-import.c b/fast-import.c
index 9658c2841..e6342386f 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -75,9 +75,9 @@ Format of STDIN stream:
      # stream formatting is: \, " and LF.  Otherwise these values
 	 # are UTF8.
      #
-  ref_str     ::= ref     | '"' quoted(ref)     '"' ;
-  sha1exp_str ::= sha1exp | '"' quoted(sha1exp) '"' ;
-  tag_str     ::= tag     | '"' quoted(tag)     '"' ;
+  ref_str     ::= ref;
+  sha1exp_str ::= sha1exp;
+  tag_str     ::= tag;
   path_str    ::= path    | '"' quoted(path)    '"' ;
   mode        ::= '100644' | '644'
                 | '100755' | '755'
@@ -1546,8 +1546,7 @@ static void file_change_d(struct branch *b)
 
 static void cmd_from(struct branch *b)
 {
-	const char *from, *endp;
-	char *str_uq;
+	const char *from;
 	struct branch *s;
 
 	if (strncmp("from ", command_buf.buf, 5))
@@ -1557,13 +1556,6 @@ static void cmd_from(struct branch *b)
 		die("Can't reinitailize branch %s", b->name);
 
 	from = strchr(command_buf.buf, ' ') + 1;
-	str_uq = unquote_c_style(from, &endp);
-	if (str_uq) {
-		if (*endp)
-			die("Garbage after string in: %s", command_buf.buf);
-		from = str_uq;
-	}
-
 	s = lookup_branch(from);
 	if (b == s)
 		die("Can't create a branch from itself: %s", b->name);
@@ -1617,20 +1609,12 @@ static void cmd_from(struct branch *b)
 static struct hash_list* cmd_merge(unsigned int *count)
 {
 	struct hash_list *list = NULL, *n, *e;
-	const char *from, *endp;
-	char *str_uq;
+	const char *from;
 	struct branch *s;
 
 	*count = 0;
 	while (!strncmp("merge ", command_buf.buf, 6)) {
 		from = strchr(command_buf.buf, ' ') + 1;
-		str_uq = unquote_c_style(from, &endp);
-		if (str_uq) {
-			if (*endp)
-				die("Garbage after string in: %s", command_buf.buf);
-			from = str_uq;
-		}
-
 		n = xmalloc(sizeof(*n));
 		s = lookup_branch(from);
 		if (s)
@@ -1661,8 +1645,6 @@ static void cmd_new_commit(void)
 	struct branch *b;
 	void *msg;
 	size_t msglen;
-	char *str_uq;
-	const char *endp;
 	char *sp;
 	char *author = NULL;
 	char *committer = NULL;
@@ -1671,17 +1653,9 @@ static void cmd_new_commit(void)
 
 	/* Obtain the branch name from the rest of our command */
 	sp = strchr(command_buf.buf, ' ') + 1;
-	str_uq = unquote_c_style(sp, &endp);
-	if (str_uq) {
-		if (*endp)
-			die("Garbage after ref in: %s", command_buf.buf);
-		sp = str_uq;
-	}
 	b = lookup_branch(sp);
 	if (!b)
 		b = new_branch(sp);
-	if (str_uq)
-		free(str_uq);
 
 	read_next_command();
 	cmd_mark();
@@ -1772,8 +1746,6 @@ static void cmd_new_commit(void)
 
 static void cmd_new_tag(void)
 {
-	char *str_uq;
-	const char *endp;
 	char *sp;
 	const char *from;
 	char *tagger;
@@ -1786,12 +1758,6 @@ static void cmd_new_tag(void)
 
 	/* Obtain the new tag name from the rest of our command */
 	sp = strchr(command_buf.buf, ' ') + 1;
-	str_uq = unquote_c_style(sp, &endp);
-	if (str_uq) {
-		if (*endp)
-			die("Garbage after tag name in: %s", command_buf.buf);
-		sp = str_uq;
-	}
 	t = pool_alloc(sizeof(struct tag));
 	t->next_tag = NULL;
 	t->name = pool_strdup(sp);
@@ -1800,22 +1766,12 @@ static void cmd_new_tag(void)
 	else
 		first_tag = t;
 	last_tag = t;
-	if (str_uq)
-		free(str_uq);
 	read_next_command();
 
 	/* from ... */
 	if (strncmp("from ", command_buf.buf, 5))
 		die("Expected from command, got %s", command_buf.buf);
-
 	from = strchr(command_buf.buf, ' ') + 1;
-	str_uq = unquote_c_style(from, &endp);
-	if (str_uq) {
-		if (*endp)
-			die("Garbage after string in: %s", command_buf.buf);
-		from = str_uq;
-	}
-
 	s = lookup_branch(from);
 	if (s) {
 		hashcpy(sha1, s->sha1);
@@ -1836,9 +1792,6 @@ static void cmd_new_tag(void)
 		free(buf);
 	} else
 		die("Invalid ref name or SHA1 expression: %s", from);
-
-	if (str_uq)
-		free(str_uq);
 	read_next_command();
 
 	/* tagger ... */
@@ -1885,18 +1838,10 @@ static void cmd_new_tag(void)
 static void cmd_reset_branch(void)
 {
 	struct branch *b;
-	char *str_uq;
-	const char *endp;
 	char *sp;
 
 	/* Obtain the branch name from the rest of our command */
 	sp = strchr(command_buf.buf, ' ') + 1;
-	str_uq = unquote_c_style(sp, &endp);
-	if (str_uq) {
-		if (*endp)
-			die("Garbage after ref in: %s", command_buf.buf);
-		sp = str_uq;
-	}
 	b = lookup_branch(sp);
 	if (b) {
 		b->last_commit = 0;
@@ -1907,8 +1852,6 @@ static void cmd_reset_branch(void)
 	}
 	else
 		b = new_branch(sp);
-	if (str_uq)
-		free(str_uq);
 	read_next_command();
 	cmd_from(b);
 }