If an external environment storage should be used in very rare and special cases,
the intentional behaviour should be to ignore the external environment and always
fall back to the built-in environment. By storing an empty "to be ignored" environment
into the external environment a confusing error message about invalid CRC sums will go
away and still the built-in environment is used.
With this new option we can force the intentional behaviour.
Signed-off-by: Juergen Borleis <jbe@xxxxxxxxxxxxxx>
---
commands/saveenv.c | 30 ++++++++++++++++++++++--------
scripts/bareboxenv.c | 10 ++++++++--
2 files changed, 30 insertions(+), 10 deletions(-)
diff --git a/commands/saveenv.c b/commands/saveenv.c
index 41f111d..84ddfa7 100644
--- a/commands/saveenv.c
+++ b/commands/saveenv.c
@@ -18,26 +18,39 @@
#include <common.h>
#include <command.h>
#include <errno.h>
+#include <getopt.h>
#include <fs.h>
#include <fcntl.h>
#include <envfs.h>
static int do_saveenv(int argc, char *argv[])
{
- int ret;
+ int ret, opt;
+ unsigned envfs_flags = 0;
char *filename, *dirname;
printf("saving environment\n");
- if (argc < 3)
+ while ((opt = getopt(argc, argv, "z")) > 0) {
+ switch (opt) {
+ case 'z':
+ envfs_flags |= ENVFS_FLAGS_PLACEHOLDER;
+ break;
+ }
+ }
+
+ /* destination and source are given? */
+ if (argc == optind + 2)
+ dirname = argv[optind + 1];
+ else
dirname = "/env";
+
+ /* destination only given? */
+ if (argc == optind + 1)
+ filename = argv[optind];
else
- dirname = argv[2];
- if (argc < 2)
filename = default_environment_path_get();
- else
- filename = argv[1];
- ret = envfs_save(filename, dirname, 0);
+ ret = envfs_save(filename, dirname, envfs_flags);
return ret;
}
@@ -49,13 +62,14 @@ BAREBOX_CMD_HELP_TEXT("ENVFS is usually a block in flash but can be any other fi
BAREBOX_CMD_HELP_TEXT("omitted, DIRECTORY defaults to /env and ENVFS defaults to")
BAREBOX_CMD_HELP_TEXT("/dev/env0. Note that envfs can only handle files, directories are being")
BAREBOX_CMD_HELP_TEXT("skipped silently.")
+BAREBOX_CMD_HELP_OPT ("-z", "store a 'zeroed' environment to force the built-in default environment at startup")
BAREBOX_CMD_HELP_END
BAREBOX_CMD_START(saveenv)
.cmd = do_saveenv,
BAREBOX_CMD_DESC("save environment to persistent storage")
- BAREBOX_CMD_OPTS("[ENVFS] [DIRECTORY]")
+ BAREBOX_CMD_OPTS("[-z] [ENVFS [DIRECTORY]]")
BAREBOX_CMD_GROUP(CMD_GRP_ENV)
BAREBOX_CMD_HELP(cmd_saveenv_help)
BAREBOX_CMD_END
diff --git a/scripts/bareboxenv.c b/scripts/bareboxenv.c
index ec6ccfe..1936155 100644
--- a/scripts/bareboxenv.c
+++ b/scripts/bareboxenv.c
@@ -109,6 +109,7 @@ static void usage(char *prgname)
"\n"
"options:\n"
" -s save (directory -> environment sector)\n"
+ " -z force the built-in default environment at startup\n"
" -l load (environment sector -> directory)\n"
" -p <size> pad output file to given size\n"
" -v verbose\n",
@@ -120,9 +121,10 @@ 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;
int verbose = 0;
- while((opt = getopt(argc, argv, "slp:v")) != -1) {
+ while((opt = getopt(argc, argv, "slp:vz")) != -1) {
switch (opt) {
case 's':
save = 1;
@@ -133,6 +135,10 @@ int main(int argc, char *argv[])
case 'p':
pad = strtoul(optarg, NULL, 0);
break;
+ case 'z':
+ envfs_flags |= ENVFS_FLAGS_PLACEHOLDER;
+ save = 1;
+ break;
case 'v':
verbose = 1;
break;
@@ -181,7 +187,7 @@ int main(int argc, char *argv[])
if (verbose)
printf("saving contents of %s to file %s\n", dirname, filename);
- err = envfs_save(filename, dirname, 0);
+ err = envfs_save(filename, dirname, envfs_flags);
if (verbose && err)
printf("saving env failed: %d\n", err);
--
2.0.1
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