On 11/18/20 7:22 PM, Ahmad Fatoum wrote:
> The Kconfig help text as well the function name
> machine_id_set_bootarg() suggest that enabling the Kconfig option is
> sufficient to have barebox pass the machine id to the kernel.
>
> This is not the case, so change the naming/documentation to make this
> clearer.
>
> Cc: Bastian Krause <bst@xxxxxxxxxxxxxx>
> Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> ---
> common/Kconfig | 19 ++++++++++---------
> common/bootm.c | 2 +-
> common/machine_id.c | 4 ++--
> 3 files changed, 13 insertions(+), 12 deletions(-)
Thanks!
Reviewed-by: Bastian Krause <bst@xxxxxxxxxxxxxx>
Bastian
>
> diff --git a/common/Kconfig b/common/Kconfig
> index 9b73aa84549c..ffdce2f96c59 100644
> --- a/common/Kconfig
> +++ b/common/Kconfig
> @@ -989,19 +989,20 @@ config RESET_SOURCE
> useful for any kind of system recovery or repair.
>
> config MACHINE_ID
> - bool "pass machine-id to kernel"
> + bool "compute unique machine-id"
> depends on FLEXIBLE_BOOTARGS
> depends on SHA1
> help
> - Sets the linux.bootargs.machine_id global variable with a value of
> - systemd.machine_id=UID. The UID is a persistent device-specific
> - id. It is a hash over device-specific information provided by various
> - sources.
> + Compute a persistent machine-specific id and store it to $global.machine_id.
> + The id is a hash of device-specific information added via
> + machine_id_set_hashable(). If multiple sources are available, the
> + information provided by the last call prior to the late initcall
> + set_machine_id() is used to generate the machine id from. Thus when
> + updating barebox the machine id might change.
>
> - Note: if multiple sources provide hashable device-specific information
> - (via machine_id_set_hashable()) the information provided by the last call
> - prior to the late initcall set_machine_id() is used to generate the
> - machine id from. Thus when updating barebox the machine id might change.
> + global.bootm.provide_machine_id may be used to automatically set
> + the linux.bootargs.machine_id global variable with a value of
> + systemd.machine_id=${global.machine_id}
>
> Note: if no hashable information is available no machine id will be passed
> to the kernel.
> diff --git a/common/bootm.c b/common/bootm.c
> index f70ef10100b0..59efc610997f 100644
> --- a/common/bootm.c
> +++ b/common/bootm.c
> @@ -856,4 +856,4 @@ BAREBOX_MAGICVAR(global.bootm.verify, "bootm default verify level");
> BAREBOX_MAGICVAR(global.bootm.verbose, "bootm default verbosity level (0=quiet)");
> BAREBOX_MAGICVAR(global.bootm.appendroot, "Add root= option to Kernel to mount rootfs from the device the Kernel comes from (default, device can be overridden via global.bootm.root_dev)");
> BAREBOX_MAGICVAR(global.bootm.root_dev, "bootm default root device (overrides default device in global.bootm.appendroot)");
> -BAREBOX_MAGICVAR(global.bootm.provide_machine_id, "If true, add systemd.machine_id= with value of global.machine_id to Kernel");
> +BAREBOX_MAGICVAR(global.bootm.provide_machine_id, "If true, append systemd.machine_id=$global.machine_id to Kernel command line");
> diff --git a/common/machine_id.c b/common/machine_id.c
> index c1309ccafdd2..6480806cd287 100644
> --- a/common/machine_id.c
> +++ b/common/machine_id.c
> @@ -24,7 +24,7 @@ void machine_id_set_hashable(const void *hashable, size_t len)
> __machine_id_hashable_length = len;
> }
>
> -static int machine_id_set_bootarg(void)
> +static int machine_id_set_globalvar(void)
> {
> struct digest *digest = NULL;
> unsigned char machine_id[SHA1_DIGEST_SIZE];
> @@ -64,6 +64,6 @@ out:
> return ret;
>
> }
> -late_initcall(machine_id_set_bootarg);
> +late_initcall(machine_id_set_globalvar);
>
> BAREBOX_MAGICVAR(global.machine_id, "Persistent device-specific, hexadecimal, 32-character id");
>
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