write_entry: untangle symlink and regular-file cases

The write_entry() function switches on the mode of the entry
we're going to write out. The cases for S_IFLNK and S_IFREG
are lumped together. In earlier versions of the code, this
made some sense. They have a shared preamble (which reads
the blob content), a short type-specific body, and a shared
conclusion (which writes out the file contents; always for
S_IFREG and only sometimes for S_IFLNK).

But over time this has grown to make less sense. The preamble
now has conditional bits for each type, and the S_IFREG body
has grown a lot more complicated. It's hard to follow the
logic of which code is running for which mode.

Let's give each mode its own case arm. We will still share
the conclusion code, which means we now jump to it with a
goto. Ideally we'd pull that shared code into its own
function, but it touches so much internal state in the
write_entry() function that the end result is actually
harder to follow than the goto.

While we're here, we'll touch up a few bits of whitespace to
make the beginning and endings of the cases easier to read.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

entry.c

@@ -260,13 +260,31 @@ static int write_entry(struct cache_entry *ce,
 	}
 
 	switch (ce_mode_s_ifmt) {
-	case S_IFREG:
 	case S_IFLNK:
+		new = read_blob_entry(ce, &size);
+		if (!new)
+			return error("unable to read sha1 file of %s (%s)",
+				     path, oid_to_hex(&ce->oid));
+
+		/*
+		 * We can't make a real symlink; write out a regular file entry
+		 * with the symlink destination as its contents.
+		 */
+		if (!has_symlinks || to_tempfile)
+			goto write_file_entry;
+
+		ret = symlink(new, path);
+		free(new);
+		if (ret)
+			return error_errno("unable to create symlink %s", path);
+		break;
+
+	case S_IFREG:
 		/*
 		 * We do not send the blob in case of a retry, so do not
 		 * bother reading it at all.
 		 */
-		if (ce_mode_s_ifmt == S_IFREG && dco && dco->state == CE_RETRY) {
+		if (dco && dco->state == CE_RETRY) {
 			new = NULL;
 			size = 0;
 		} else {
@@ -276,42 +294,31 @@ static int write_entry(struct cache_entry *ce,
 					     path, oid_to_hex(&ce->oid));
 		}
 
-		if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
-			ret = symlink(new, path);
-			free(new);
-			if (ret)
-				return error_errno("unable to create symlink %s",
-						   path);
-			break;
-		}
-
 		/*
 		 * Convert from git internal format to working tree format
 		 */
-		if (ce_mode_s_ifmt == S_IFREG) {
-			if (dco && dco->state != CE_NO_DELAY) {
-				ret = async_convert_to_working_tree(
-					ce->name, new, size, &buf, dco);
-				if (ret && string_list_has_string(&dco->paths, ce->name)) {
-					free(new);
-					goto delayed;
-				}
-			} else
-				ret = convert_to_working_tree(
-					ce->name, new, size, &buf);
-
-			if (ret) {
+		if (dco && dco->state != CE_NO_DELAY) {
+			ret = async_convert_to_working_tree(ce->name, new,
+							    size, &buf, dco);
+			if (ret && string_list_has_string(&dco->paths, ce->name)) {
 				free(new);
-				new = strbuf_detach(&buf, &newsize);
-				size = newsize;
+				goto delayed;
 			}
-			/*
-			 * No "else" here as errors from convert are OK at this
-			 * point. If the error would have been fatal (e.g.
-			 * filter is required), then we would have died already.
-			 */
+		} else
+			ret = convert_to_working_tree(ce->name, new, size, &buf);
+
+		if (ret) {
+			free(new);
+			new = strbuf_detach(&buf, &newsize);
+			size = newsize;
 		}
+		/*
+		 * No "else" here as errors from convert are OK at this
+		 * point. If the error would have been fatal (e.g.
+		 * filter is required), then we would have died already.
+		 */
 
+	write_file_entry:
 		fd = open_output_fd(path, ce, to_tempfile);
 		if (fd < 0) {
 			free(new);
@@ -326,6 +333,7 @@ static int write_entry(struct cache_entry *ce,
 		if (wrote != size)
 			return error("unable to write file %s", path);
 		break;
+
 	case S_IFGITLINK:
 		if (to_tempfile)
 			return error("cannot create temporary submodule %s", path);
@@ -337,6 +345,7 @@ static int write_entry(struct cache_entry *ce,
 				NULL, oid_to_hex(&ce->oid),
 				state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
 		break;
+
 	default:
 		return error("unknown file mode for %s in index", path);
 	}