From 7d42d6242327165a69cba183c54084b54a0966b1 Mon Sep 17 00:00:00 2001
From: Igor Zalatov <flyrouter@gmail.com>
Date: Mon, 17 May 2021 18:30:03 +0300
Subject: [PATCH] Add mdev support

---
 general/overlay/etc/init.d/S10mdev    | 21 +++++++++++++++++
 general/overlay/etc/mdev.conf         | 22 ++++++++++++++++++
 general/overlay/lib/mdev/automount.sh | 33 +++++++++++++++++++++++++++
 3 files changed, 76 insertions(+)
 create mode 100755 general/overlay/etc/init.d/S10mdev
 create mode 100644 general/overlay/etc/mdev.conf
 create mode 100755 general/overlay/lib/mdev/automount.sh

diff --git a/general/overlay/etc/init.d/S10mdev b/general/overlay/etc/init.d/S10mdev
new file mode 100755
index 00000000..3cb3a65c
--- /dev/null
+++ b/general/overlay/etc/init.d/S10mdev
@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# Start mdev....
+#
+
+case "$1" in
+  start)
+        echo "Starting mdev..."
+        # echo /sbin/mdev >/proc/sys/kernel/hotplug
+        /sbin/mdev -s
+        ;;
+  stop)
+        ;;
+  restart|reload)
+        ;;
+  *)
+        echo "Usage: $0 {start|stop|restart}"
+        exit 1
+esac
+
+exit $?
diff --git a/general/overlay/etc/mdev.conf b/general/overlay/etc/mdev.conf
new file mode 100644
index 00000000..e86e7483
--- /dev/null
+++ b/general/overlay/etc/mdev.conf
@@ -0,0 +1,22 @@
+# Provide user, group, and mode information for devices.  If a regex matches
+# the device name provided by sysfs, use the appropriate user:group and mode
+# instead of the default 0:0 660.
+#
+# Syntax:
+# [-]devicename_regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
+# [-]$ENVVAR=regex    user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
+# [-]@maj,min[-min2]  user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
+#
+# [-]: do not stop on this match, continue reading mdev.conf
+# =: move, >: move and create a symlink
+# !: do not create device node
+# @|$|*: run@cmd if $ACTION=add,  $cmd if $ACTION=remove, *cmd in all cases
+#
+#
+#
+mmcblk[0-9] root:disk 660
+mmcblk[0-9]p[0-9] root:disk 660 *(/lib/mdev/automount.sh)
+#
+sd[a-z] root:disk 660
+sd[a-z] [0-9] root:disk 660 *(/lib/mdev/automount.sh)
+#
diff --git a/general/overlay/lib/mdev/automount.sh b/general/overlay/lib/mdev/automount.sh
new file mode 100755
index 00000000..f1b9e6a1
--- /dev/null
+++ b/general/overlay/lib/mdev/automount.sh
@@ -0,0 +1,33 @@
+#!/bin/sh
+
+destdir=/mnt
+
+my_umount()
+{
+    if grep -qs "^/dev/$1 " /proc/mounts ; then
+        umount "${destdir}/$1";
+    fi
+
+    [ -d "${destdir}/$1" ] && rmdir "${destdir}/$1"
+}
+
+my_mount()
+{
+    mkdir -p "${destdir}/$1" || exit 1
+
+    if ! mount -t auto -o sync "/dev/$1" "${destdir}/$1"; then
+        # failed to mount, clean up mountpoint
+        rmdir "${destdir}/$1"
+        exit 1
+    fi
+}
+
+case "${ACTION}" in
+add|"")
+    my_umount ${MDEV}
+    my_mount ${MDEV}
+    ;;
+remove)
+    my_umount ${MDEV}
+    ;;
+esac
\ No newline at end of file