Detect and enable swap partitions on live
The laptops owned by SOI have 8 GB of RAM, and live systems running on them sometimes run out of memory. To mitigate this, find and enable the swap partition of the installed OS on the internal SSD.
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[Unit]
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Description=detect and enable swap partitions.
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Before=basic.target
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After=local-fs.target systemd-tmpfiles-setup.service
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DefaultDependencies=no
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ConditionKernelCommandLine=boot=live
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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ExecStart=/usr/local/bin/detect-swap
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[Install]
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WantedBy=basic.target
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#!/usr/bin/python3
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import subprocess
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import json
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SD_GPT_SWAP = '0657fd6d-a4ab-43c4-84e5-0933c84b4f4f'
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lsblk_result = subprocess.run(['lsblk', '--json', '--output=PATH,PARTTYPE'], check=True, stdout=subprocess.PIPE)
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lablk_out = json.loads(lsblk_result.stdout)
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for block in lablk_out['blockdevices']:
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if block['parttype'] == SD_GPT_SWAP:
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print('Enabling swap on', block['path'])
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subprocess.run(['swapon', block['path']])
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