.Dd May 16, 2020
.Dt HSCRIPT-FROMJSON 1
.Os "Adélie Linux"
.Sh NAME
.Nm hscript-fromjson
.Nd convert a JSON object to a HorizonScript
.Sh SYNOPSIS
.Nm
.Op Fl fn
.Op Fl h
.Op Fl v
.Op Ar INSTALLFILE
.Op Ar JSONFILE
.Sh DESCRIPTION
The
.Nm
utility converts a valid JSON object to a HorizonScript.  The JSON schema
used for representing HorizonScript can be found in the Horizon YANG model.
In most installations, this file is available in
.Pa /usr/share/doc/horizon .
.Pp
.Nm
will, by default, read JSON from stdin, and write the HorizonScript
representation to
.Pa /etc/horizon/installfile .
If you want to read the JSON from a file, you must supply the path to write
the HorizonScript first.
.Sh OPTIONS
The
.Nm
utility supports the following options:
.Bl -tag -width Ds
.It Fl f
Force writing the HorizonScript to the specified path, even if it already
exists.  By default,
.Nm
will display an error and quit without writing if a HorizonScript already
exists at the specified path.
.It Fl h
Displays a help message, and then exits.
.It Fl n
Disables colour output and ANSI escape sequences in any log messages.  This
is the default when not running from a terminal.
.It Fl v
Displays the version information for this utility, and then exits.
.El
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
The following invocation will read JSON from stdin and output the resultant
HorizonScript to
.Pa /etc/horizon/installfile:
.Dl $ hscript-fromjson
.Pp
The following invocation will read JSON from
.Pa myimage.json
and output the resultant HorizonScript to stdout:
.Dl $ hscript-fromjson - myimage.json
.Sh DIAGNOSTICS
.Bl -diag
.It "%dateT%time log %location: %status: %message[: %extra]"
A message of type
.Cm %status
was logged while processing
.Cm %location .
The log message
.Cm %message
may be followed by additional information or hints in
.Cm %extra .
.El
.Sh SEE ALSO
.Xr hscript-validate 1 ,
.Xr hscript 5 ,
.Xr hscript-executor 8 .
.Sh HISTORY
The
.Nm
command first appeared in Horizon 0.9.
.Sh AUTHORS
.An A. Wilcox
.Aq awilfox@adelielinux.org