From 1533521bff4121dcd8dc37ef34fd09fc6a5018fb Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Thu, 29 Nov 2012 20:22:58 +0100 Subject: loadenv: allow more fine grained environment loading This implements two new options for the loadenv command: -s: removes (scrubs) old directory contents to be able to create a fresh environment from for example /dev/defaultenv -n: no overwrite. Do not overwrite existing files. This allows to keep parts of the old environment. Signed-off-by: Sascha Hauer --- common/environment.c | 12 ++++++++++-- common/startup.c | 4 ++-- 2 files changed, 12 insertions(+), 4 deletions(-) (limited to 'common') diff --git a/common/environment.c b/common/environment.c index 69c4c0aa76..e11cd9dd47 100644 --- a/common/environment.c +++ b/common/environment.c @@ -206,7 +206,7 @@ EXPORT_SYMBOL(envfs_save); * Note: This function will also be used on the host! See note in the header * of this file. */ -int envfs_load(char *filename, char *dir) +int envfs_load(char *filename, char *dir, unsigned flags) { struct envfs_super super; void *buf = NULL, *buf_free = NULL; @@ -316,6 +316,14 @@ int envfs_load(char *filename, char *dir) } free(str); } else { + struct stat s; + + if (flags & ENV_FLAG_NO_OVERWRITE && + !stat(str, &s)) { + printf("skip %s\n", str); + goto skip; + } + fd = open(str, O_WRONLY | O_CREAT | O_TRUNC, 0644); free(str); if (fd < 0) { @@ -333,7 +341,7 @@ int envfs_load(char *filename, char *dir) } close(fd); } - +skip: buf += PAD4(inode_size); size -= headerlen_full + PAD4(inode_size) + sizeof(struct envfs_inode); diff --git a/common/startup.c b/common/startup.c index 7bb3c73c12..14409a217d 100644 --- a/common/startup.c +++ b/common/startup.c @@ -108,12 +108,12 @@ void start_barebox (void) debug("initcalls done\n"); #ifdef CONFIG_ENV_HANDLING - if (envfs_load(default_environment_path, "/env")) { + if (envfs_load(default_environment_path, "/env", 0)) { #ifdef CONFIG_DEFAULT_ENVIRONMENT printf("no valid environment found on %s. " "Using default environment\n", default_environment_path); - envfs_load("/dev/defaultenv", "/env"); + envfs_load("/dev/defaultenv", "/env", 0); #endif } #endif -- cgit v1.2.3