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

[Rafał Miłecki]

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.

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,
-- 
2.13.7


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