04/09: doc: Better explain the 'password' field of <user-account>.

[guix-commits]

civodul pushed a commit to branch master
in repository guix.

commit c483c5c82c129b51ef6068fad3d3f0fbca1f5df1
Author: Ludovic Courtès <address@hidden>
Date:   Mon Mar 4 13:55:41 2019 +0100

    doc: Better explain the 'password' field of <user-account>.
    
    * doc/guix.texi (User Accounts): Provide an example use of 'crypt', and
    mention the security implications.
---
 doc/guix.texi | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 9fb5cff..7fcfcb1 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -10695,6 +10695,7 @@ account.  System accounts are sometimes treated 
specially; for instance,
 graphical login managers do not list them.
 
 @anchor{user-account-password}
address@hidden password, for user accounts
 @item @code{password} (default: @code{#f})
 You would normally leave this field to @code{#f}, initialize user
 passwords as @code{root} with the @command{passwd} command, and then let
@@ -10702,11 +10703,29 @@ users change it with @command{passwd}.  Passwords set 
with
 @command{passwd} are of course preserved across reboot and
 reconfiguration.
 
-If you @emph{do} want to have a preset password for an account, then
-this field must contain the encrypted password, as a string.
address@hidden,,, libc, The GNU C Library Reference Manual}, for more 
information
-on password encryption, and @ref{Encryption,,, guile, GNU Guile Reference
-Manual}, for information on Guile's @code{crypt} procedure.
+If you @emph{do} want to set an initial password for an account, then
+this field must contain the encrypted password, as a string.  You can use the
address@hidden procedure for this purpose:
+
address@hidden
+(user-account
+  (name "charlie")
+  (home-directory "/home/charlie")
+  (group "users")
+
+  ;; Specify a SHA-512-hashed initial password.
+  (password (crypt "InitialPassword!" "$6$abc")))
address@hidden example
+
address@hidden Note
+The hash of this initial password will be available in a file in
address@hidden/gnu/store}, readable by all the users, so this method must be 
used with
+care.
address@hidden quotation
+
address@hidden Storage,,, libc, The GNU C Library Reference Manual}, for
+more information on password encryption, and @ref{Encryption,,, guile, GNU
+Guile Reference Manual}, for information on Guile's @code{crypt} procedure.
 
 @end table
 @end deftp