This allows dynamically updating the prompt to reflect new contextual or
global information (e.g. which security mode barebox is in).
Signed-off-by: Ahmad Fatoum <a.fat...@barebox.org>
---
common/Kconfig | 1 +
common/hush.c | 12 +++++++++++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/common/Kconfig b/common/Kconfig
index b2449207eff9..1d9570ef67b5 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -515,6 +515,7 @@ config HUSH_FANCY_PROMPT
help
Allow to set PS1 from the command line. PS1 can have several escaped
commands
like \h for the 'model' string or \w for the current working
directory.
+ PS1 can be set statically or computed on demand by executing
PROMPT_COMMAND.
config CMDLINE_EDITING
depends on !SHELL_NONE
diff --git a/common/hush.c b/common/hush.c
index 086cbc68b891..552e7327de92 100644
--- a/common/hush.c
+++ b/common/hush.c
@@ -426,8 +426,17 @@ static char *getprompt(void)
static char prompt[PATH_MAX + 32];
#ifdef CONFIG_HUSH_FANCY_PROMPT
- const char *ps1 = getenv("PS1");
+ const char *ps1, *prompt_command;
+ struct p_context ctx = {};
+ prompt_command = getenv("PROMPT_COMMAND");
+ if (prompt_command) {
+ initialize_context(&ctx);
+ parse_string_outer(&ctx, prompt_command, FLAG_PARSE_SEMICOLON);
+ release_context(&ctx);
+ }
+
+ ps1 = getenv("PS1");
if (ps1)
process_escape_sequence(ps1, prompt, PATH_MAX + 32);
else
@@ -2065,6 +2074,7 @@ BAREBOX_CMD_END
BAREBOX_MAGICVAR(PATH, "colon separated list of paths to search for
executables");
#ifdef CONFIG_HUSH_FANCY_PROMPT
BAREBOX_MAGICVAR(PS1, "hush prompt");
+BAREBOX_MAGICVAR(PROMPT_COMMAND, "command to execute prior to each primary
prompt");
#endif
static int binfmt_sh_excute(struct binfmt_hook *b, char *file, int argc, char
**argv)
--
2.39.5
