install: Add support for offline installations.

* `phreaknet offline` can be used on an Internet-connected system to
  prepare the needed files for an offline installation.
* `phreaknet install --offline` can be used to obtain all needed sources
  from the offline directory created by `phreaknet offline`.
* The `--noupdate` flag can be used to not update the package manager.

PHREAKSCRIPT-39 #close

Author: InterLinked1

phreaknet.1

@@ -60,6 +60,12 @@ Install cached PhreakScript man page (may be outdated)
 Install or upgrade Asterisk.
 This is the primary command provided by PhreakScript.
 .TP
+\f[B]offline\f[R]
+Prepare offline installation source for disconnected environments
+.TP
+\f[B]noupdate\f[R]
+Do not update the package manager
+.TP
 \f[B]source\f[R]
 Download the source code for Asterisk into the current working directory.
 .TP
@@ -328,6 +334,9 @@ Do not install extra features or enhancements.
 Bug fixes are always installed.
 (May be required for older versions)
 .TP
+\f[B]--offline\f[R]
+Use an offline installation source for disconnected environments
+.TP
 \f[B]-v\f[R], \f[B]--version\f[R]
 Specific version of Asterisk to install (M.m.b e.g.
 18.8.0).

phreaknet.1.md

@@ -60,6 +60,12 @@ the best Asterisk and DAHDI experience.
 **source**
 : Download and patch source code only, without building or installing. This operates on the current working directory.
 
+**offline**
+: Prepare offline installation source for disconnected environments
+
+**noupdate**
+: Do not update the package manager
+
 **experimental**
 : Add experimental features to an existing Asterisk source
 
@@ -346,6 +352,9 @@ directories if necessary.
 **--vanilla**
 : Do not install extra features or enhancements. Bug fixes are always installed. (May be required for older versions)
 
+**--offline**
+: Use an offline installation source for disconnected environments
+
 **-v**, **--version**
 : Specific version of Asterisk to install (M.m.b e.g. 18.8.0). Also, see **--vanilla**.