[OpenWrt-Devel] [PATCH] block: generate hotplug.d mount events

[Alberto Bursi]

On 05/12/18 22:35, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal at milecki.pl>
>
> This is what was implemented in mountd and what some scripts used to
> use. It's a pretty generic solution for managing software that may use
> e.g. USB storage.


Could you explain a bit more about what is this doing instead of just 
mentioning mountd?

There is pretty scarce info about mountd.

-Alberto

>
> Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
> ---
>   block.c | 29 +++++++++++++++++++++++++++++
>   1 file changed, 29 insertions(+)
>
> diff --git a/block.c b/block.c
> index 46050b4..fe63fb0 100644
> --- a/block.c
> +++ b/block.c
> @@ -880,6 +880,31 @@ static int exec_mount(const char *source, const char *target,
>   	return err;
>   }
>   
> +static void hotplug_call_mount(const char *action, const char *device)
> +{
> +	pid_t pid;
> +
> +	pid = fork();
> +	if (!pid) {
> +		char * const argv[] = { "hotplug-call", "mount", NULL };
> +		char actionenv[] = "ACTION=xxxxxx";
> +		char deviceenv[32];
> +		char *envp[] = { actionenv, deviceenv, NULL };
> +
> +		snprintf(actionenv, sizeof(actionenv), "ACTION=%s", action);
> +		snprintf(deviceenv, sizeof(deviceenv), "DEVICE=%s", device);
> +
> +		execve("/sbin/hotplug-call", argv, envp);
> +		exit(-1);
> +	} else if (pid > 0) {
> +		int status;
> +
> +		waitpid(pid, &status, 0);
> +		if (WEXITSTATUS(status))
> +			ULOG_ERR("hotplug-call call failed: %d\n", WEXITSTATUS(status));
> +	}
> +}
> +
>   static int handle_mount(const char *source, const char *target,
>                           const char *fstype, struct mount *m)
>   {
> @@ -1079,6 +1104,8 @@ static int mount_device(struct probe_info *pr, int type)
>   
>   	handle_swapfiles(true);
>   
> +	hotplug_call_mount("add", device);
> +
>   	return 0;
>   }
>   
> @@ -1091,6 +1118,8 @@ static int umount_device(char *path)
>   	if (!mp)
>   		return -1;
>   
> +	hotplug_call_mount("remove", basename(path));
> +
>   	err = umount2(mp, MNT_DETACH);
>   	if (err)
>   		ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp,

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