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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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doc/guix.texi
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@ -4536,8 +4536,9 @@ You can freely access a huge library of build logs!
@cindex package definition, editing
So many packages, so many source files! The @command{guix edit} command
facilitates the life of packagers by pointing their editor at the source
file containing the definition of the specified packages. For instance:
facilitates the life of users and packagers by pointing their editor at
the source file containing the definition of the specified packages.
For instance:
@example
guix edit gcc@@4.9 vim
@ -4545,9 +4546,15 @@ guix edit gcc@@4.9 vim
@noindent
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.
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
@kbd{M-x guix-edit} command and a similar functionality in the ``package
info'' and ``package list'' buffers created by the @kbd{M-x