使用systemd挂载MTP设备

Question

我终于解决了安装问题！我花了三个星期寻找更合适的解决方案。

首先，我将这些更改应用于 Android 设备的规则脚本51-android.规则 /etc/udev/rules.d/51-android.rules:

diff --git a/51-android.rules b/51-android.rules
index d75ddb3..65f235c 100644
--- a/51-android.rules
+++ b/51-android.rules
@@ -9,7 +9,7 @@
 # https://github.com/M0Rf30/android-udev-rules
 
 # Skip testing for android devices if device is not add, or usb
-ACTION!="add", ACTION!="bind", GOTO="android_usb_rules_end"
+ENV{DEVTYPE}!="usb_device", GOTO="android_usb_rules_end"
 SUBSYSTEM!="usb", GOTO="android_usb_rules_end"
 
 # Skip testing for unexpected devices like hubs, controllers or printers
@@ -820,13 +820,16 @@ GOTO="android_usb_rule_match"
 LABEL="not_ZTE"
 
 # ZUK
-ATTR{idVendor}=="2b4c", ENV{adb_user}="yes"
+ATTR{idVendor}=="2b4c", ENV{adb_user}="yes", GOTO="android_usb_rule_match"
 
 # Verifone
-ATTR{idVendor}=="11ca", ENV{adb_user}="yes"
+ATTR{idVendor}=="11ca", ENV{adb_user}="yes", GOTO="android_usb_rule_match"
+
+GOTO="android_usb_rules_end"
 
 # Skip other vendor tests
 LABEL="android_usb_rule_match"
+TAG+="systemd", SYMLINK+="$env{ID_VENDOR}_$env{ID_MODEL}_$env{ID_REVISION}", ENV{SYSTEMD_WANTS}+="mtp@$env{ID_VENDOR}_$env{ID_MODEL}_$env{ID_REVISION}.service"
 
 # Symlink shortcuts to reduce code in tests above
 ENV{adb_adbfast}=="yes", ENV{adb_adb}="yes", ENV{adb_fast}="yes"

在此补丁中，我形成了到所连接设备的符号链接（我正在根据设备的属性形成一个名称，以便更好地理解）：

TAG+="systemd", SYMLINK+="$env{ID_VENDOR}_$env{ID_MODEL}_$env{ID_REVISION}", ENV{SYSTEMD_WANTS}+="mtp@$env{ID_VENDOR}_$env{ID_MODEL}_$env{ID_REVISION}.service"

我还指定了systemd标签（没有它，systemd 服务调用对我不起作用）并根据我的模板调用服务（如下）：/etc/systemd/system/[email protected]

[Unit]
Description=Mounting MTP devices
BindsTo=dev-%i.device
After=dev-%i.device

[Service]
Type=oneshot
RemainAfterExit=true
TimeoutStartSec=30
ExecStart=/etc/udev/scripts/mtp.sh add %I
ExecStop=/etc/udev/scripts/mtp.sh remove %I

[Install]
WantedBy=dev-%i.device

在系统中，我的设备如下所示dev-NAME.device：

~ # systemctl --all --full -t device | grep Swift
dev-android.device                                               loaded active plugged Swift_2_Plus                                                                         
dev-android4.device                                              loaded active plugged Swift_2_Plus                                                                         
dev-bus-usb-001-007.device                                       loaded active plugged Swift_2_Plus                                                                         
dev-Wileyfox_Swift_2_Plus_0318.device                            loaded active plugged Swift_2_Plus                                                                         
sys-devices-pci0000:00-0000:00:15.0-usb1-1\x2d4.device           loaded active plugged Swift_2_Plus

在调用的处理程序脚本中，systemd我创建一个目录（在我的例子中是Wileyfox_Swift_2_Plus_0318）并尝试将我的设备安装在那里。如果成功则挂载，如果失败则触发卸载：

#! /bin/sh

. /etc/thinstation.env
. $TS_GLOBAL

ACTION=$1
DEVICE_NAME=$2
MOUNT=/bin/aft-mtp-mount

CURRENT_DEVICE_MOUNT_PATH=$BASE_MOUNT_PATH/$USB_MOUNT_DIR/$DEVICE_NAME

_logger() {
    echo "$2" | systemd-cat -p $1 -t "mtp"
}

_mounted() {
    if [ -n "$(grep -oe "$1" /proc/mounts)" ]; then
        return 0
    else
        return 1
    fi
}

_mount() {
    _logger info "mount $DEVICE_NAME"
    if [ -d $CURRENT_DEVICE_MOUNT_PATH ] && _mounted $CURRENT_DEVICE_MOUNT_PATH; then
        _logger warning "$DEVICE_NAME already mounted"
        exit 1
    fi
    if [ ! -d $CURRENT_DEVICE_MOUNT_PATH ]; then
        mkdir $CURRENT_DEVICE_MOUNT_PATH
        if is_enabled "$USB_STORAGE_SYNC" && [ ! -n "$(echo $USB_MOUNT_OPTIONS | grep -e sync)" ]; then
            USB_MOUNT_OPTIONS=$USB_MOUNT_OPTIONS,sync
        fi
        $MOUNT -o $USB_MOUNT_OPTIONS $CURRENT_DEVICE_MOUNT_PATH
        if _mounted $CURRENT_DEVICE_MOUNT_PATH && [ "$(ls -A $CURRENT_DEVICE_MOUNT_PATH)" ]; then
            _logger info "mounted $DEVICE_NAME in $CURRENT_DEVICE_MOUNT_PATH"
        else
            _logger warning "$DEVICE_NAME failed to mount"
            _umount
            exit 2
        fi
    else
        _logger warning "$CURRENT_DEVICE_MOUNT_PATH already exists"
        exit 3
    fi
}

_umount() {
    _logger info "unmount $DEVICE_NAME"
    if [[ -d $CURRENT_DEVICE_MOUNT_PATH ]]; then
        while _mounted $CURRENT_DEVICE_MOUNT_PATH; do
            umount $CURRENT_DEVICE_MOUNT_PATH
        done
        _logger info "unmounted $DEVICE_NAME in $CURRENT_DEVICE_MOUNT_PATH"
        rm -r $CURRENT_DEVICE_MOUNT_PATH
    else
        _logger warning "$DEVICE_NAME was not mounted"
    fi
}

if [ $ACTION == "add" ]; then
    _mount
elif [ $ACTION == "remove" ]; then
    _umount
fi

exit 0

因此，我成功地安装了该设备，并通过连接到该设备的操作系统启动操作系统也不会出现任何问题。

MTP设备自动安装演示。

如果需要改进，我创建了一个存储库。

Answer 1