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Helper functions for spawning sub-processes.

val exec : 
  ?cwd:Fpath.t ->
  ?stdin:string ->
  ?pp_error_command:(Stdlib.Format.formatter -> unit) ->
  cancellable:bool ->
  job:Job.t ->
  Lwt_process.command ->
  unit or_error Lwt.t

exec ~job cmd uses Lwt_process to run cmd, with output to job's log.

parameter cwd
Sets the current working directory for this command.

parameter cancellable
Should the process be terminated if the job is cancelled?

parameter stdin
Data to write to stdin before closing it.

parameter pp_error_command
Format the command for an error message. The default is to print "Command $cmd".

val check_output : 
  ?cwd:Fpath.t ->
  ?stdin:string ->
  ?pp_error_command:(Stdlib.Format.formatter -> unit) ->
  cancellable:bool ->
  job:Job.t ->
  Lwt_process.command ->
  string or_error Lwt.t

Like exec, but return the child's stdout as a string rather than writing it to the log.

val with_tmpdir : ?prefix:string -> (Fpath.t -> 'a Lwt.t) -> 'a Lwt.t

with_tmpdir fn creates a temporary directory, runs fn tmpdir, and then deletes the directory (recursively).

parameter prefix
Allows giving the directory a more meaningful name (for debugging).