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Old 05-25-2011, 11:20 PM   #1
dimm0k
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Registered: May 2008
Location: Brooklyn ZOO
Distribution: Slackware64 14.2
Posts: 498

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Help creating a suspend/hibernate script to handle USB HDDs


Currently running Slackware 13.37 64-bit on a notebook and finally have suspend/hibernate after realizing that USB devices, especially USB HDDs, need to be disconnected before suspend/hibernate can work. Problem is I have 2 USB HDDs that are connected to my notebook whenever the notebook is stationary for the extra storage so I'd like to create a script that would get invoked that would stop the suspend/hibernate process if certain partitions are mounted. I know what I would like to accomplish, but I have basic scripting knowledge so I was hoping to get some assistance.

1. script would basically store a user specified string containing devices that are non-USB, ie: $NONUSB="/dev/sda /dev/sdb"

2. possibly use /etc/mtab to get a list of what is currently mounted and then remove lines containing whatever is specified in $NONUSB and store those values in $USB

3. run a for loop that executes 'umount' on each token in $USB
3a. stop suspend/hibernate process if 'umount' fails at any point
3b. if 'umount' passes then suspend/hibernate

Is this possible?
 
Old 05-26-2011, 01:01 PM   #2
dimm0k
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Registered: May 2008
Location: Brooklyn ZOO
Distribution: Slackware64 14.2
Posts: 498

Original Poster
Rep: Reputation: 49
Ok, so so far I have the following which lets a user specify devices that are not USB and removes those specific entries from /etc/mtab, storing them in /tmp/mountedusb. From that file the script issues the umount command to unmount all the entries in /tmp/mountedusb. The script gives an "exit 1" to abort suspend/hibernation if umount fails along the way. Is it possible to avoid the use/creation of /tmp/mountedusb and have everything done by passing things in memory? Anything else I might be missing that I should include to make it a little more robust?

Code:
#!/bin/sh

# devices that are known to not be USB
NONUSB="/dev/sda /dev/sdc"
DEVICES="0000:00:1a.0 0000:00:1d.0"

case "${1}" in
  hibernate|suspend)
    # writes to disk
    /bin/sync

    # extract first column of /etc/mtab, remove everything that is not /dev/sd?
    cat /etc/mtab | cut -d" " -f1 | grep /dev/sd > /tmp/mountedusb

    # remove devices listed in NONUSB, essentially creating a file that contains only
    # USB/removable devices
    for nu in $NONUSB; do
      cat /tmp/mountedusb | grep -v $nu > /tmp/mountedusb.tmp
      mv -f /tmp/mountedusb.tmp /tmp/mountedusb
    done

    # unmount devices, abort suspend if umount fails
    for um in `cat /tmp/mountedusb`; do
      /bin/umount $um 2> /dev/null
      if [ $? -gt 0 ]; then
        exit 1
      fi
    done

    # Unbind ehci_hcd for all devices
    for d in $DEVICES; do
      echo -n "$d" | tee /sys/bus/pci/drivers/ehci_hcd/unbind
    done
    ;;
  resume|thaw)
    # Bind ehci_hcd for all devices
    for d in $DEVICES; do
      echo -n "$d" | tee /sys/bus/pci/drivers/ehci_hcd/bind
    done
    ;;
esac

Last edited by dimm0k; 05-26-2011 at 02:06 PM.
 
  


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