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cmd: env: Add indirect to indirectly set values

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This allows an ergonomic-enough approximation of ${!variable} expansion.
This could be used the following way:

```
for target in ${boot_targets}; do
   env indirect target_name target_name_${target}
   # ...
done
```

Assuming `target_name_mmc0` and similar are set appropriately.

A default value can be optionally provided.

Note: this acts on environment variables, not hush variables.

Signed-off-by: Samuel Dionne-Riel <samuel@dionne-riel.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: "Marek Behún" <marek.behun@nic.cz>
[trini: Don't enable by default]
This commit is contained in:
Samuel Dionne-Riel 2021-12-20 18:31:56 -05:00 committed by Tom Rini
parent 8d61237edb
commit ec57bd7454
2 changed files with 48 additions and 0 deletions
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3
cmd/Kconfig
View file

@ -518,6 +518,9 @@ config CMD_NVEDIT_EFI
If enabled, we are allowed to set/print UEFI variables using
"env" command with "-e" option without knowing details.
config CMD_NVEDIT_INDIRECT
bool "env indirect - Sets environment value from another"
config CMD_NVEDIT_INFO
bool "env info - print or evaluate environment information"
help

45
cmd/nvedit.c
View file

@ -1018,6 +1018,45 @@ sep_err:
}
#endif
#if defined(CONFIG_CMD_NVEDIT_INDIRECT)
static int do_env_indirect(struct cmd_tbl *cmdtp, int flag,
int argc, char *const argv[])
{
char *to = argv[1];
char *from = argv[2];
char *default_value = NULL;
int ret = 0;
if (argc < 3 || argc > 4) {
return CMD_RET_USAGE;
}
if (argc == 4) {
default_value = argv[3];
}
if (env_get(from) == NULL && default_value == NULL) {
printf("## env indirect: Environment variable for <from> (%s) does not exist.\n", from);
return CMD_RET_FAILURE;
}
if (env_get(from) == NULL) {
ret = env_set(to, default_value);
}
else {
ret = env_set(to, env_get(from));
}
if (ret == 0) {
return CMD_RET_SUCCESS;
}
else {
return CMD_RET_FAILURE;
}
}
#endif
#if defined(CONFIG_CMD_NVEDIT_INFO)
/*
* print_env_info - print environment information
@ -1181,6 +1220,9 @@ static struct cmd_tbl cmd_env_sub[] = {
#if defined(CONFIG_CMD_IMPORTENV)
U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
#endif
#if defined(CONFIG_CMD_NVEDIT_INDIRECT)
U_BOOT_CMD_MKENT(indirect, 3, 0, do_env_indirect, "", ""),
#endif
#if defined(CONFIG_CMD_NVEDIT_INFO)
U_BOOT_CMD_MKENT(info, 3, 0, do_env_info, "", ""),
#endif
@ -1265,6 +1307,9 @@ static char env_help_text[] =
#if defined(CONFIG_CMD_IMPORTENV)
"env import [-d] [-t [-r] | -b | -c] addr [size] [var ...] - import environment\n"
#endif
#if defined(CONFIG_CMD_NVEDIT_INDIRECT)
"env indirect <to> <from> [default] - sets <to> to the value of <from>, using [default] when unset\n"
#endif
#if defined(CONFIG_CMD_NVEDIT_INFO)
"env info - display environment information\n"
"env info [-d] [-p] [-q] - evaluate environment information\n"