[PATCH 2/2] envfs: new flag for sorting env before saving

["Baeuerle, Florian" <Florian.Baeuerle@allegion.com>]

The resulting environment was dependend of the build machines'
filesystem, i.e. the order in which readdir returns dirents depends on
the filesystem implementation.

Use the new flag in scripts/bareboxenv.c for generating a reproducible
built-in environment.

Signed-off-by: Florian Bäuerle <florian.baeuerle@allegion.com>
---
 common/environment.c | 8 ++++++--
 include/envfs.h      | 1 +
 scripts/bareboxenv.c | 2 +-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/common/environment.c b/common/environment.c
index 56a030eda..cea55f313 100644
--- a/common/environment.c
+++ b/common/environment.c
@@ -257,6 +257,7 @@ int envfs_save(const char *filename, const char *dirname, unsigned flags)
 	void *buf = NULL, *wbuf;
 	struct envfs_entry *env;
 	const char *defenv_path = default_environment_path_get();
+	int recursive_flags = ACTION_RECURSE;
 
 	if (!filename)
 		filename = defenv_path;
@@ -276,10 +277,13 @@ int envfs_save(const char *filename, const char *dirname, unsigned flags)
 	if (flags & ENVFS_FLAGS_FORCE_BUILT_IN) {
 		size = 0; /* force no content */
 	} else {
+		if (flags & ENVFS_FLAGS_SORTED)
+			recursive_flags |= ACTION_SORT;
+
 		/* first pass: calculate size */
-		recursive_action(dirname, ACTION_RECURSE, file_action,
+		recursive_action(dirname, recursive_flags, file_action,
 				NULL, &data, 0);
-		recursive_action("/.defaultenv", ACTION_RECURSE,
+		recursive_action("/.defaultenv", recursive_flags,
 				file_remove_action, NULL, &data, 0);
 		size = 0;
 
diff --git a/include/envfs.h b/include/envfs.h
index 27c4b42c6..fa12c60a8 100644
--- a/include/envfs.h
+++ b/include/envfs.h
@@ -45,6 +45,7 @@ struct envfs_super {
 	uint16_t future;		/* reserved for future use */
 	uint32_t flags;			/* feature flags */
 #define ENVFS_FLAGS_FORCE_BUILT_IN	(1 << 0)
+#define ENVFS_FLAGS_SORTED		(1 << 1)
 	uint32_t sb_crc;		/* crc for the superblock */
 };
 
diff --git a/scripts/bareboxenv.c b/scripts/bareboxenv.c
index de57c2fce..3e7c736b9 100644
--- a/scripts/bareboxenv.c
+++ b/scripts/bareboxenv.c
@@ -127,7 +127,7 @@ int main(int argc, char *argv[])
 	int opt;
 	int save = 0, load = 0, pad = 0, err = 0, fd;
 	char *filename = NULL, *dirname = NULL;
-	unsigned envfs_flags = 0;
+	unsigned envfs_flags = ENVFS_FLAGS_SORTED;
 	int verbose = 0;
 
 	while((opt = getopt(argc, argv, "slp:vz")) != -1) {
-- 
2.19.2

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