environment: Set 'GUIX_ENVIRONMENT' to the profile.

* guix/scripts/environment.scm (create-environment): Set
'GUIX_ENVIRONMENT' to PROFILE.
* tests/guix-environment.sh: Test it.
* doc/guix.texi (Invoking guix environment): Document it.

1 files changed, 9 insertions, 1 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 8ab4522140..786fe551ba 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -5456,7 +5456,8 @@ details on Bash start-up files.}.
 
 @vindex GUIX_ENVIRONMENT
 @command{guix environment} defines the @code{GUIX_ENVIRONMENT}
-variable in the shell it spawns.  This allows users to, say, define a
+variable in the shell it spawns; its value is the file name of the
+profile of this environment.  This allows users to, say, define a
 specific prompt for development environments in their @file{.bashrc}
 (@pxref{Bash Startup Files,,, bash, The GNU Bash Reference Manual}):
 
@@ -5467,6 +5468,13 @@ then
 fi
 @end example
 
+@noindent
+... or to browse the profile:
+
+@example
+$ ls "$GUIX_ENVIRONMENT/bin"
+@end example
+
 Additionally, more than one package may be specified, in which case the
 union of the inputs for the given packages are used.  For example, the
 command below spawns a shell where all of the dependencies of both Guile