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        (assign_pair
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          op: assign_op.Equal
          rhs: 
            {
              (command_sub
                left_token: <Id.Left_DollarParen '$('>
                child: (C {<git>} {<rev-parse>} {<--show-toplevel>})
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            }
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                    (command.DBracket
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                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
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                        )
                      ]
                    )
                    (C {<shift>})
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                        )
                      ]
                    )
                    (C {<echo>} {(DQ <'EXECUTING on '> ($ Id.VSub_DollarName '$NODE'))})
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                )
            )
          ]
          spids: [20 35]
        )
      ]
      else_action: [(C {<Id.Lit_Colon ':'>})]
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              ]
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                  spids: [107]
                )
              ]
            )
            (command.ForEach
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              iter_words: [
                {
                  (braced_var_sub
                    token: <Id.VSub_Name REQUIRED_VARS>
                    bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                  )
                }
              ]
              do_arg_iter: F
              body: 
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                          cond: 
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                                  child: 
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                                          op_id: Id.BoolUnary_z
                                          child: 
                                            {
                                              (braced_var_sub
                                                token: <Id.VSub_Name ENVVAR>
                                                prefix_op: (Id.VSub_Bang)
                                              )
                                            }
                                        )
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          action: [
                            (command.Simple
                              words: [
                                {<echo>}
                                {
                                  (DQ <'Environment variable '> ($ Id.VSub_DollarName '$ENVVAR') 
                                    <' must be set!'>
                                  )
                                }
                              ]
                              redirects: [
                                (redir
                                  op: <Id.Redir_GreatAnd '>&'>
                                  loc: (redir_loc.Fd fd:1)
                                  arg: {<2>}
                                )
                              ]
                              do_fork: T
                            )
                            (command.ShAssignment
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                                  lhs: (sh_lhs_expr.Name name:FAILED_ENVVAR_CHECK)
                                  op: assign_op.Equal
                                  rhs: {<1>}
                                  spids: [161]
                                )
                              ]
                            )
                          ]
                          spids: [132 146]
                        )
                      ]
                    )
                  ]
                )
            )
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DBracket
                              expr: 
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                                  op_id: Id.BoolBinary_GlobNEqual
                                  left: {($ Id.VSub_DollarName '$FAILED_ENVVAR_CHECK')}
                                  right: {<0>}
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (command.Sentence
                      child: (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  spids: [171 184]
                )
              ]
            )
          ]
        )
    )
    (command.ShFunction
      name: load_configs
      body: 
        (BraceGroup
          children: [
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DBracket
                              expr: 
                                (bool_expr.Unary
                                  op_id: Id.BoolUnary_f
                                  child: 
                                    {
                                      (DQ ($ Id.VSub_DollarName '$REPO_ROOT') 
                                        <'/bootstrap/config/bootstrap_config.sh'>
                                      )
                                    }
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (command.If
                      arms: [
                        (if_arm
                          cond: 
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                              commands: [
                                (command.Sentence
                                  child: 
                                    (command.DBracket
                                      expr: 
                                        (bool_expr.LogicalNot
                                          child: 
                                            (bool_expr.Unary
                                              op_id: Id.BoolUnary_f
                                              child: 
                                                {
                                                  (DQ ($ Id.VSub_DollarName '$REPO_ROOT') 
                                                    <
'/bootstrap/config/bootstrap_config.sh.overrides'
                                                    >
                                                  )
                                                }
                                            )
                                        )
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          action: [
                            (C {<echo>} 
                              {
                                (DQ 
                                  <
'Performing one-time move of bootstrap_config.sh to bootstrap_config.sh.overrides...'
                                  >
                                )
                              }
                            )
                            (C {<mv>} 
                              {($ Id.VSub_DollarName '$REPO_ROOT') 
                                <'/bootstrap/config/bootstrap_config.sh'>
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                            )
                          ]
                          spids: [231 247]
                        )
                      ]
                      else_action: [
                        (command.Simple
                          words: [
                            {<echo>}
                            {
                              (DQ 
                                <
'ERROR: both bootstrap_config.sh and bootstrap_config.sh.overrides exist!'
                                >
                              )
                            }
                          ]
                          redirects: [
                            (redir
                              op: <Id.Redir_GreatAnd '>&'>
                              loc: (redir_loc.Fd fd:1)
                              arg: {<2>}
                            )
                          ]
                          do_fork: T
                        )
                        (command.Simple
                          words: [
                            {<echo>}
                            {
                              (DQ 
                                <
'Please move all overrides to bootstrap_config.sh.overrides and remove bootstrap_config.sh!'
                                >
                              )
                            }
                          ]
                          redirects: [
                            (redir
                              op: <Id.Redir_GreatAnd '>&'>
                              loc: (redir_loc.Fd fd:1)
                              arg: {<2>}
                            )
                          ]
                          do_fork: T
                        )
                        (command.ControlFlow
                          token: <Id.ControlFlow_Exit exit>
                          arg_word: {<1>}
                        )
                      ]
                    )
                  ]
                  spids: [214 228]
                )
              ]
            )
            (command.ShAssignment
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                (assign_pair
                  lhs: (sh_lhs_expr.Name name:BOOTSTRAP_CONFIG_DEFAULTS)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (DQ ($ Id.VSub_DollarName '$REPO_ROOT') 
                        <'/bootstrap/config/bootstrap_config.sh.defaults'>
                      )
                    }
                  spids: [301]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:BOOTSTRAP_CONFIG_OVERRIDES)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (DQ ($ Id.VSub_DollarName '$REPO_ROOT') 
                        <'/bootstrap/config/bootstrap_config.sh.overrides'>
                      )
                    }
                  spids: [308]
                )
              ]
            )
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DBracket
                              expr: 
                                (bool_expr.LogicalNot
                                  child: 
                                    (bool_expr.Unary
                                      op_id: Id.BoolUnary_f
                                      child: {($ Id.VSub_DollarName '$BOOTSTRAP_CONFIG_DEFAULTS')}
                                    )
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (command.Simple
                      words: [
                        {<echo>}
                        {
                          (DQ 
                            <
'Bootstrap configuration defaults are missing! Your repository is corrupt; please restore '
                            > ($ Id.VSub_DollarName '$REPO_ROOT') <'/bootstrap/config/bootstrap_config.sh.defaults.'>
                          )
                        }
                      ]
                      redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
                      do_fork: T
                    )
                    (command.ControlFlow
                      token: <Id.ControlFlow_Exit exit>
                      arg_word: {<1>}
                    )
                  ]
                  spids: [315 328]
                )
              ]
            )
            (C {<source>} {($ Id.VSub_DollarName '$BOOTSTRAP_CONFIG_DEFAULTS')})
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              arms: [
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                  cond: 
                    (condition.Shell
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                          child: 
                            (command.DBracket
                              expr: 
                                (bool_expr.Unary
                                  op_id: Id.BoolUnary_f
                                  child: {($ Id.VSub_DollarName '$BOOTSTRAP_CONFIG_OVERRIDES')}
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
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                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  spids: [356 367]
                )
              ]
            )
          ]
        )
    )
  ]
)