action.yml

name: 'mount-tmpfs'
description: 'Create and mount a temporary file system in memory'
inputs:
  size:
    description: FS size in MB (>= 1)
    required: true
    default: 1
  root:
    description: 'Root path for the mount point (default = working directory)'
    required: true
    default: '.'
outputs:
  uuid:
    description: 'Device uuid of the disk'
    value: ${{ steps.create.outputs.uuid }}
  mnt:
    description: 'Mount path of the disk (=<root>/<uuid>)'
    value: ${{ steps.create.outputs.mnt }}
runs:
  using: "composite"
  steps:
    - name: Create
      id: create
      shell: bash
      run: |
        UUID="$(cat /proc/sys/kernel/random/uuid)"
        MNT="${{ inputs.root }}/${UUID}"
        echo ":rocket: Temp FS ${MNT} creation started" >> $GITHUB_STEP_SUMMARY
        sudo mkdir -p "${MNT}" \
        && echo ":heavy_check_mark: Temp FS mount point creation succeeded" >> $GITHUB_STEP_SUMMARY \
        || { echo ":x: Temp FS  mount point creation failed" >> $GITHUB_STEP_SUMMARY; exit 1; }
        sudo mount -o size=${{ inputs.size }}M,uid=$(id -u) -t tmpfs tmpfs "${MNT}" \
        && echo ":heavy_check_mark: Temp FS mount operation succeeded" >> $GITHUB_STEP_SUMMARY \
        || { echo ":x: Temp FS mount operation failed" >> $GITHUB_STEP_SUMMARY; exit 1; } 
        echo "uuid=${UUID}" >> $GITHUB_OUTPUT
        echo "mnt=${MNT}" >> $GITHUB_OUTPUT