text: """
  This module defines the bulk modulus workflow.
  """
  
  from uuid import uuid4
  
  from fireworks import Firework, Workflow
  from pymatgen.analysis.elasticity.strain import Deformation
  from pymatgen.io.vasp.sets import MPStaticSet
  
  from atomate.utils.utils import get_logger
  from atomate.vasp.firetasks.parse_outputs import FitEOSToDb
  from atomate.vasp.workflows.base.deformations import get_wf_deformations
  
  __author__ = "Kiran Mathew"
  __email__ = "kmathew@lbl.gov"
  
  logger = get_logger(__name__)
  
  
  def get_wf_bulk_modulus(
      structure,
      deformations,
      vasp_input_set=None,
      vasp_cmd="vasp",
      db_file=None,
      user_kpoints_settings=None,
      eos="vinet",
      tag=None,
      copy_vasp_outputs=False,
      user_incar_settings=None,
  ):
      """
      Returns the workflow that computes the bulk modulus by fitting to the given equation
      of state.
  
      Args:
          structure (Structure): input structure.
          deformations (list): list of deformation matrices (list of lists).
          vasp_input_set (VaspInputSet): for the static deformation calculations
          vasp_cmd (str): vasp command to run.
          db_file (str): path to the db file.
          user_kpoints_settings (dict): example: {"grid_density": 7000}
          eos (str): equation of state used for fitting the energies and the volumes.
              supported equation of states: "quadratic", "murnaghan", "birch",
              "birch_murnaghan", "pourier_tarantola", "vinet", "deltafactor".
              See pymatgen.analysis.eos.py
          tag (str): something unique to identify the tasks in this workflow. If None a
              random uuid will be assigned.
          copy_vasp_outputs (bool): whether or not copy the outputs from the previous calc
              (usually structure optimization) before the deformations are performed.
          user_incar_settings (dict):
  
      Returns:
          Workflow
      """
  
      tag = tag or f"bulk_modulus group: >>{str(uuid4())}<<"
  
      deformations = [Deformation(defo_mat) for defo_mat in deformations]
  
      vis_static = vasp_input_set or MPStaticSet(
          structure=structure,
          force_gamma=True,
          user_kpoints_settings=user_kpoints_settings,
          user_incar_settings=user_incar_settings,
      )
  
      wf_bulk_modulus = get_wf_deformations(
          structure,
          deformations,
          name="bulk_modulus deformation",
          vasp_input_set=vis_static,
          vasp_cmd=vasp_cmd,
          copy_vasp_outputs=copy_vasp_outputs,
          db_file=db_file,
          tag=tag,
      )
  
      fit_eos = FitEOSToDb(tag=tag, db_file=db_file, eos=eos)
      fw_analysis = Firework(fit_eos, name="fit equation of state")
      wf_analysis = Workflow.from_Firework(fw_analysis)
  
      wf_bulk_modulus.append_wf(wf_analysis, wf_bulk_modulus.leaf_fw_ids)
  
      formula = structure.composition.reduced_formula
      wf_bulk_modulus.name = "{}:{}".format(formula, "Bulk modulus")
  
      return wf_bulk_modulus
  