Fantastic
I've been hurt by this in the past
- and this patch would certainly would have helped save some time!
--
Kieran
On 18 October 2013 09:47, Michael Opdenacker
<michael.opdenac...@free-electrons.com> wrote:
> This patch proposes to make init failures more explicit.
>
> Before this, the "No init found" message didn't help much.
> It could sometimes be misleading and actually mean
> "No *working* init found".
>
> This message could hide many different issues:
> - no init program candidates found at all
> - some init program candidates exist but can't be executed
> (missing execute permissions, failed to load shared libraries,
> executable compiled for an unknown architecture...)
>
> This patch notifies the kernel user when a candidate
> init program is found but can't be executed. It also replaces
> "No init found" by "No working init found", which is more correct.
>
> This will help embedded Linux developers (especially the new comers),
> regularly making and debugging new root filesystems.
>
> Signed-off-by: Michael Opdenacker <michael.opdenac...@free-electrons.com>
> ---
> init/main.c | 24 +++++++++++++++++++-----
> 1 file changed, 19 insertions(+), 5 deletions(-)
>
> diff --git a/init/main.c b/init/main.c
> index 63d3e8f..a9a2833 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -811,6 +811,20 @@ static int run_init_process(const char *init_filename)
> (const char __user *const __user *)envp_init);
> }
>
> +static int try_to_run_init_process(const char *init_filename)
> +{
> + int ret;
> +
> + ret = run_init_process(init_filename);
> +
> + if (ret && ret != -ENOENT) {
> + pr_err("Starting init: %s exists but couldn't execute it\n",
> + init_filename);
> + }
> +
> + return ret;
> +}
> +
> static noinline void __init kernel_init_freeable(void);
>
> static int __ref kernel_init(void *unused)
> @@ -843,13 +857,13 @@ static int __ref kernel_init(void *unused)
> pr_err("Failed to execute %s. Attempting defaults...\n",
> execute_command);
> }
> - if (!run_init_process("/sbin/init") ||
> - !run_init_process("/etc/init") ||
> - !run_init_process("/bin/init") ||
> - !run_init_process("/bin/sh"))
> + if (!try_to_run_init_process("/sbin/init") ||
> + !try_to_run_init_process("/etc/init") ||
> + !try_to_run_init_process("/bin/init") ||
> + !try_to_run_init_process("/bin/sh"))
> return 0;
>
> - panic("No init found. Try passing init= option to kernel. "
> + panic("No working init found. Try passing init= option to kernel. "
> "See Linux Documentation/init.txt for guidance.");
> }
>
> --
> 1.8.1.2
>
> --
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