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doc: Explain when guix edit is read-only.

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* doc/guix.texi (Invoking guix edit): Explain when you can and can't
  edit the recipe.

Signed-off-by: Alex Kost <alezost@gmail.com>
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myglc2 2016-07-21 18:35:34 -04:00 • committed by Alex Kost
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@ -4536,8 +4536,9 @@ You can freely access a huge library of build logs!
@cindex package definition, editing @cindex package definition, editing
So many packages, so many source files! The @command{guix edit} command So many packages, so many source files! The @command{guix edit} command
facilitates the life of packagers by pointing their editor at the source facilitates the life of users and packagers by pointing their editor at
file containing the definition of the specified packages. For instance: the source file containing the definition of the specified packages.
For instance:
@example @example
guix edit gcc@@4.9 vim guix edit gcc@@4.9 vim
@ -4545,9 +4546,15 @@ guix edit gcc@@4.9 vim
@noindent @noindent
launches the program specified in the @code{VISUAL} or in the launches the program specified in the @code{VISUAL} or in the
@code{EDITOR} environment variable to edit the recipe of GCC@tie{}4.9.3 @code{EDITOR} environment variable to view the recipe of GCC@tie{}4.9.3
and that of Vim. and that of Vim.
If you are using a Guix Git checkout (@pxref{Building from Git}), or
have created your own packages on @code{GUIX_PACKAGE_PATH}
(@pxref{Defining Packages}), you will be able to edit the package
recipes. Otherwise, you will be able to examine the read-only recipes
for packages currently in the store.
If you are using Emacs, note that the Emacs user interface provides the If you are using Emacs, note that the Emacs user interface provides the
@kbd{M-x guix-edit} command and a similar functionality in the ``package @kbd{M-x guix-edit} command and a similar functionality in the ``package
info'' and ``package list'' buffers created by the @kbd{M-x info'' and ``package list'' buffers created by the @kbd{M-x