Linux – mount命令返回零/ 0但不起作用

 root[1023]: mount: /dev/sda1 mounted on /media/partitionlabel.

但最后设备没有安装,它没有列在/ etc / mtab – / proc / mounts – findmnt – mount中.如果我在设备上运行umount,它也说,设备没有安装.

但是,如果我从终端手动运行脚本作为root,那么它工作正常,设备可以挂载,但不是由udev运行时.

我已经在脚本开始时添加了8秒的休眠时间,以确保它不是时间问题,并且还从规则文件名中删除了数字,以确保udevd将新规则放在规则队列的底部,并且脚本将遵循其他系统规则,但没有成功.

系统日志：

(装置附后)

kernel: usb 1-1.2: new high-speed USB device number 12 using dwc_otg
kernel: usb 1-1.2: New USB device found, idVendor=058f, idProduct=6387
kernel: usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
kernel: usb 1-1.2: Product: Mass Storage
kernel: usb 1-1.2: Manufacturer: Generic
kernel: usb 1-1.2: SerialNumber: 24DCF568
kernel: usb-storage 1-1.2:1.0: USB Mass Storage device detected
kernel: scsi host6: usb-storage 1-1.2:1.0
kernel: scsi 6:0:0:0: Direct-Access     Generic  Flash Disk       8.07 PQ: 0 ANSI: 4
kernel: sd 6:0:0:0: [sda] 1968128 512-byte logical blocks: (1.00 GB/961 MiB)
kernel: sd 6:0:0:0: [sda] Write Protect is off
kernel: sd 6:0:0:0: [sda] Mode Sense: 23 00 00 00
kernel: sd 6:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
kernel:  sda: sda1
kernel: sda: p1 size 1968126 extends beyond EOD, enabling native capacity
kernel:  sda: sda1
kernel: sda: p1 size 1968126 extends beyond EOD, truncated
kernel: sd 6:0:0:0: [sda] Attached SCSI removable disk
root[1004]: /usr/local/sbin/udev-auto-mount.sh - status: started to automount sda1
root[1019]: /usr/local/sbin/udev-auto-mount.sh - status: Device Label is partitionlabel and Filesystem is vfat.
root[1021]: /usr/local/sbin/udev-auto-mount.sh - status: mounting the device sda1 by filesystem vfat to /media/partitionlabel.
root[1023]: mount: /dev/sda1 mounted on /media/partitionlabel.
root[1024]: /usr/local/sbin/udev-auto-mount.sh status: mount command proceed for vfat, retval is 0
root[1025]: /usr/local/sbin/udev-auto-mount.sh - status: succeed!

CONFIGS：

/etc/udev/rules.d/local-rules：

udev中定义的规则是：

# /etc/udev/rules.d/local-rules
ENV{ID_BUS}=="usb",     ACTION=="add",  ENV{DEVTYPE}=="partition",      \
          RUN+="/usr/local/sbin/udev-automounter.sh %k $ENV{ID_FS_LABEL_ENC}"

udev-auto-mount.sh

该脚本由另一个在udev规则中定义的脚本启动.
它如此直接,它使得挂载点目录和使用其文件系统类型和一些常规选项将USB设备安装到挂载点.我在mount命令中添加了“-v”选项以使其更加详细,并将所有输出重定向到syslog,因此我可以看到它是如何运行的,但它并没有说太多.

#!/bin/sh
## /usr/local/sbin/udec-auto-mount.sh
##

logger -s "$0 - status: started to automount ${1}"
DEVICE=$1
sleep 8 

#...
#...
# Checking inputs, getting filesystem type (ID_FS_TYPE), partition label
# (ID_FS_LABEL) and ...

mkdir "/media/${ID_FS_LABEL}"


logger -s "$0 - status: mounting the device ${DEVICE} by filesystem ${ID_FS_TYPE} to /media/${ID_FS_LABEL}."
case $ID_FS_TYPE in
    vfat)   mount -v -t vfat -o sync,noatime,nosuid,nodev /dev/${DEVICE} "/media/${ID_FS_LABEL}" 2>&1 | logger
        let retVal=$?
        logger -s "$0 status: mount command proceed for vfat, retval is ${retVal}"
        ;;

    *)  mount -v -t auto -o sync,noatime /dev/${DEVICE} "/media/${ID_FS_LABEL}"
        ;;
esac
if [ ${retVal} -eq 0 ]; then
    logger -s "$0 - status: succeed!"
    exit 0
else
    logger -s "$0 Error: unable to mount the device ${DEVICE}, retval is ${retVal}"
    rmdir "/media/${ID_FS_LABEL}"
fi

exit 0

也许它有帮助：

有时,在脚本无法安装USB设备后,当我分离设备时,系统日志会出现一些错误：

kernel: usb 1-1.2: USB disconnect, device number 11
systemd-udevd[143]: error: /dev/sda: No such file or directory
systemd-udevd[977]: inotify_add_watch(7, /dev/sda, 10) failed: No such file or directory

编辑：

这是’mount’版本：

$mount -V:
mount from util-linux 2.27.1 (libmount 2.27.0: assert, debug)

mount ... | logger
rc=$?

没有按预期工作：管道的返回值是该管道中最后一个元素的返回值.

$> false | true; echo $?
0

如果您使用bash,请尝试PIPESTATUS：

$> false | true; echo $? ${PIPESTATUS[0]}
0 1
$> true | false; echo $? {PIPESTATUS[0]}
1 0

PIPESTATUS是一个数组变量. bash手册页中的详细信息.其他炮弹可能与PIPESTATUS类似