archive: unify file attribute handling

Now that all file attribute handling for git archive has moved to archive.c,
we can unexport sha1_file_to_archive() and is_archive_path_ignored() even
disappears.

Add setup_archive_check(), modelled after similar functions used in the code
of other commands that support multiple file attributes.

Also remove convert_to_archive(), as it's only remaining function with
attribute handling gone was to call format_subst() if commit was not NULL,
which is now checked in sha1_file_to_archive().

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

archive.c

@@ -36,34 +36,9 @@ static void format_subst(const struct commit *commit,
 	free(to_free);
 }
 
-static int convert_to_archive(const char *path,
-                              const void *src, size_t len,
-                              struct strbuf *buf,
-                              const struct commit *commit)
-{
-	static struct git_attr *attr_export_subst;
-	struct git_attr_check check[1];
-
-	if (!commit)
-		return 0;
-
-	if (!attr_export_subst)
-		attr_export_subst = git_attr("export-subst", 12);
-
-	check[0].attr = attr_export_subst;
-	if (git_checkattr(path, ARRAY_SIZE(check), check))
-		return 0;
-	if (!ATTR_TRUE(check[0].value))
-		return 0;
-
-	format_subst(commit, src, len, buf);
-	return 1;
-}
-
-void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
-                           unsigned int mode, enum object_type *type,
-                           unsigned long *sizep,
-                           const struct commit *commit)
+static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
+		unsigned int mode, enum object_type *type,
+		unsigned long *sizep, const struct commit *commit)
 {
 	void *buffer;
 
@@ -75,26 +50,26 @@ void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
 		strbuf_init(&buf, 0);
 		strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
 		convert_to_working_tree(path, buf.buf, buf.len, &buf);
-		convert_to_archive(path, buf.buf, buf.len, &buf, commit);
+		if (commit)
+			format_subst(commit, buf.buf, buf.len, &buf);
 		buffer = strbuf_detach(&buf, &size);
 		*sizep = size;
 	}
 
 	return buffer;
 }
 
-int is_archive_path_ignored(const char *path)
+static void setup_archive_check(struct git_attr_check *check)
 {
 	static struct git_attr *attr_export_ignore;
-	struct git_attr_check check[1];
+	static struct git_attr *attr_export_subst;
 
-	if (!attr_export_ignore)
+	if (!attr_export_ignore) {
 		attr_export_ignore = git_attr("export-ignore", 13);
-
+		attr_export_subst = git_attr("export-subst", 12);
+	}
 	check[0].attr = attr_export_ignore;
-	if (git_checkattr(path, ARRAY_SIZE(check), check))
-		return 0;
-	return ATTR_TRUE(check[0].value);
+	check[1].attr = attr_export_subst;
 }
 
 struct archiver_context {
@@ -110,6 +85,9 @@ static int write_archive_entry(const unsigned char *sha1, const char *base,
 	struct archiver_context *c = context;
 	struct archiver_args *args = c->args;
 	write_archive_entry_fn_t write_entry = c->write_entry;
+	struct git_attr_check check[2];
+	const char *path_without_prefix;
+	int convert = 0;
 	int err;
 	enum object_type type;
 	unsigned long size;
@@ -119,9 +97,14 @@ static int write_archive_entry(const unsigned char *sha1, const char *base,
 	strbuf_grow(&path, PATH_MAX);
 	strbuf_add(&path, base, baselen);
 	strbuf_addstr(&path, filename);
+	path_without_prefix = path.buf + args->baselen;
 
-	if (is_archive_path_ignored(path.buf + args->baselen))
-		return 0;
+	setup_archive_check(check);
+	if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) {
+		if (ATTR_TRUE(check[0].value))
+			return 0;
+		convert = ATTR_TRUE(check[1].value);
+	}
 
 	if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 		strbuf_addch(&path, '/');
@@ -133,8 +116,8 @@ static int write_archive_entry(const unsigned char *sha1, const char *base,
 		return READ_TREE_RECURSIVE;
 	}
 
-	buffer = sha1_file_to_archive(path.buf + args->baselen, sha1, mode,
-			&type, &size, args->commit);
+	buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
+			&type, &size, convert ? args->commit : NULL);
 	if (!buffer)
 		return error("cannot read %s", sha1_to_hex(sha1));
 	if (args->verbose)

archive.h

@@ -43,9 +43,6 @@ extern int write_tar_archive(struct archiver_args *);
 extern int write_zip_archive(struct archiver_args *);
 extern void *parse_extra_zip_args(int argc, const char **argv);
 
-extern void *sha1_file_to_archive(const char *path, const unsigned char *sha1, unsigned int mode, enum object_type *type, unsigned long *size, const struct commit *commit);
-extern int is_archive_path_ignored(const char *path);
-
 extern int write_archive_entries(struct archiver_args *args, write_archive_entry_fn_t write_entry);
 
 #endif	/* ARCHIVE_H */