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NOTE: These posts are being re-created from old Jamf Nation posts not because they are the best but because they may have useful things that were mangled in the Jamf Nation transition to its most recent hosting platform.

That, & they were always supposed to be blog posts anyway… I didn’t have a blog then.


An Extension Attribute script for Mac portable battery health:

#!/bin/bash
#shellcheck disable=SC2207

if ! /usr/sbin/sysctl -n hw.model | /usr/bin/grep -q -i 'book'
then
    echo "<result>no</result>"; exit
fi

IFS=$'\n'
pwrdata=($(/usr/libexec/PlistBuddy \
    -c "print 0:_items:0:sppower_battery_health_info:sppower_battery_health" \
    -c "print 0:_items:0:sppower_battery_health_info:sppower_battery_cycle_count" \
    -c "print 0:_items:0:sppower_battery_health_info:sppower_battery_health_maximum_capacity" \
    -c "print 0:_items:0:sppower_battery_charge_info:sppower_battery_max_capacity" \
    -c "print 0:_items:0:sppower_battery_model_info:sppower_battery_manufacturer" \
    -c "print 0:_items:0:sppower_battery_model_info:sppower_battery_firmware_version" \
    -c "print 0:_items:0:sppower_battery_model_info:sppower_battery_hardware_revision" \
    -c "print 0:_items:0:sppower_battery_model_info:sppower_battery_cell_revision" \
    /dev/stdin <<< "$(/usr/sbin/system_profiler -xml SPPowerDataType)" 2> /dev/null))

result(){
    echo "Health = ${pwrdata[0]}"
    echo "Cycle Count = ${pwrdata[1]}"
    
    if [[ "${pwrdata[2]}" == *'%'* ]]
    then
        echo "Max Capacity = ${pwrdata[2]}"
    else
        echo "Max Capacity = ${pwrdata[2]} mAh"
    fi

    if [ "$(/usr/sbin/sysctl -in hw.optional.arm64)" = 1 ] && /usr/sbin/sysctl -n machdep.cpu.brand_string | /usr/bin/grep -q 'Apple' && /usr/bin/uname -v | /usr/bin/grep -q 'ARM64'
    then
        i=5 # Apple Silicon
    else
        i=6 # Intel
        echo "Manufacturer = ${pwrdata[i-3]}"
    fi

    echo "Firmware Version = ${pwrdata[i-2]}"
    echo "Hardware Revision = ${pwrdata[i-1]}"
    echo "Cell Revision = ${pwrdata[i]}"
}

echo "<result>$(result)</result>"

Some notes:

  • I want to separate Mac portables from non-portables without need for a Smart Group.
    • That’s what the 1st section does.
    • Every Mac portable since the beginning of time has had “Book” in the name.
    • This is how I like to find them. You may like another way (like checking for battery which I am kind of doing here anyway…)
  • Intel Mac portables & Apple Silicon Mac portables have different battery reporting.
    • This sucks & I found out only after version 1 of this EA.
  • Not everyone is aware that you can pass multiple arguments to a single PlistBuddy command.
    • Although, zsh can be a little crybaby about how much can be parsed in 1 stream…
  • I wanted the data to appear in a multi-line format.
    • I am a multi-line Extension Attribute fan. Always have been, always will be.
    • When some version of Jamf broke my multi-line EAs a few years back, I died a little inside.
  • I also wanted customized, human-readable labels for the attributes.
    • This craziness with the conditionals at the end handles the labels, order & the cases (Intel vs. Apple Silicon).

Here is the result in Jamf. (See how one has mAh & the other has % capacity & a different number of lines?)

Anyway, that’s all. I know there are fancier ways to do this. OSQuery, Fleet, etc. I like EAs.

PS. Update:

Fleet (which uses OSQuery) was not reporting this correctly. 🙂 I believe they have addressed this based on my EA (fun!)

I am reporting this in Feedback Assistant — I don’t understand why Apple stopped reporting battery manufacturer…


Source: https://community.jamf.com/general-discussions-2/i-ve-got-the-power-27003