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common: command: Add command execution tracer.

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When using boot scripts it can become quite hard to understand
which commands are actually executed during bootup (e.g. where
is a kernel image loaded from or which DTB is in use).

Shell scripts suffer from a similar problem and many shells address
this problem with a command execution tracer (e.g. BASH has xtrace,
which can be enabled by "set -x").

This patch introduces a command tracer for U-Boot, which prints
every command with its arguments before it is executed.

Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
This commit is contained in:
Christoph Muellner 2019-04-05 13:03:46 +02:00 committed by Simon Glass
parent 62392675cd
commit 7ae31fccec
2 changed files with 25 additions and 0 deletions
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11
cmd/Kconfig
View File

@ -53,6 +53,17 @@ config SYS_PROMPT
This string is displayed in the command line to the left of the
cursor.
config SYS_XTRACE
string "Command execution tracer"
depends on CMDLINE
default y if CMDLINE
help
This option enables the possiblity to print all commands before
executing them and after all variables are evaluated (similar
to Bash's xtrace/'set -x' feature).
To enable the tracer a variable "xtrace" needs to be defined in
the environment.
menu "Autoboot options"
config AUTOBOOT

14
common/command.c
View File

@ -574,6 +574,20 @@ enum command_ret_t cmd_process(int flag, int argc, char * const argv[],
enum command_ret_t rc = CMD_RET_SUCCESS;
cmd_tbl_t *cmdtp;
#if defined(CONFIG_SYS_XTRACE)
char *xtrace;
xtrace = env_get("xtrace");
if (xtrace) {
puts("+");
for (int i = 0; i < argc; i++) {
puts(" ");
puts(argv[i]);
}
puts("\n");
}
#endif
/* Look up command in command table */
cmdtp = find_cmd(argv[0]);
if (cmdtp == NULL) {