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-rw-r--r--doc/guix.texi15
-rw-r--r--guix/scripts/package.scm61
-rw-r--r--tests/guix-package.sh12
3 files changed, 76 insertions, 12 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 13bcd103ca..bbe84ab275 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -806,6 +806,21 @@ Installing, removing, or upgrading packages from a generation that has
been rolled back to overwrites previous future generations. Thus, the
history of a profile's generations is always linear.
+@item --switch-generation=@var{pattern}
+@itemx -S @var{pattern}
+Switch to a particular generation defined by @var{pattern}.
+
+@var{pattern} may be either a generation number or a number prefixed
+with ``+'' or ``-''. The latter means: move forward/backward by a
+specified number of generations. For example, if you want to return to
+the latest generation after @code{--roll-back}, use
+@code{--switch-generation=+1}.
+
+The difference between @code{--roll-back} and
+@code{--switch-generation=-1} is that @code{--switch-generation} will
+not make a zeroth generation, so if a specified generation does not
+exist, the current generation will not be changed.
+
@item --search-paths
@cindex search paths
Report environment variable definitions, in Bash syntax, that may be
diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm
index ab9d303127..3a72053766 100644
--- a/guix/scripts/package.scm
+++ b/guix/scripts/package.scm
@@ -46,6 +46,8 @@
#:use-module (gnu packages guile)
#:use-module ((gnu packages bootstrap) #:select (%bootstrap-guile))
#:export (specification->package+output
+ switch-to-generation
+ switch-to-previous-generation
roll-back
delete-generation
delete-generations
@@ -96,14 +98,26 @@ return PROFILE unchanged. The goal is to treat '-p ~/.guix-profile' as if
(switch-symlinks generation prof)))
+(define (switch-to-generation profile number)
+ "Atomically switch PROFILE to the generation NUMBER."
+ (let ((current (generation-number profile))
+ (generation (generation-file-name profile number)))
+ (cond ((not (file-exists? profile))
+ (raise (condition (&profile-not-found-error
+ (profile profile)))))
+ ((not (file-exists? generation))
+ (raise (condition (&missing-generation-error
+ (profile profile)
+ (generation number)))))
+ (else
+ (format #t (_ "switching from generation ~a to ~a~%")
+ current number)
+ (switch-symlinks profile generation)))))
+
(define (switch-to-previous-generation profile)
"Atomically switch PROFILE to the previous generation."
- (let* ((number (generation-number profile))
- (previous-number (previous-generation-number profile number))
- (previous-generation (generation-file-name profile previous-number)))
- (format #t (_ "switching from generation ~a to ~a~%")
- number previous-number)
- (switch-symlinks profile previous-generation)))
+ (switch-to-generation profile
+ (previous-generation-number profile)))
(define (roll-back store profile)
"Roll back to the previous generation of PROFILE."
@@ -411,6 +425,9 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
-d, --delete-generations[=PATTERN]
delete generations matching PATTERN"))
(display (_ "
+ -S, --switch-generation=PATTERN
+ switch to a generation matching PATTERN"))
+ (display (_ "
-p, --profile=PROFILE use PROFILE instead of the user's default profile"))
(newline)
(display (_ "
@@ -490,6 +507,10 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
(values (alist-cons 'delete-generations (or arg "")
result)
#f)))
+ (option '(#\S "switch-generation") #t #f
+ (lambda (opt name arg result arg-handler)
+ (values (alist-cons 'switch-generation arg result)
+ #f)))
(option '("search-paths") #f #f
(lambda (opt name arg result arg-handler)
(values (cons `(query search-paths) result)
@@ -715,13 +736,31 @@ more information.~%"))
(generation-number profile))
;; First roll back if asked to.
- (cond ((and (assoc-ref opts 'roll-back?) (not dry-run?))
- (begin
- (roll-back (%store) profile)
- (process-actions (alist-delete 'roll-back? opts))))
+ (cond ((and (assoc-ref opts 'roll-back?)
+ (not dry-run?))
+ (roll-back (%store) profile)
+ (process-actions (alist-delete 'roll-back? opts)))
+ ((and (assoc-ref opts 'switch-generation)
+ (not dry-run?))
+ (for-each
+ (match-lambda
+ (('switch-generation . pattern)
+ (let* ((number (string->number pattern))
+ (number (and number
+ (case (string-ref pattern 0)
+ ((#\+ #\-)
+ (relative-generation profile number))
+ (else number)))))
+ (if number
+ (switch-to-generation profile number)
+ (leave (_ "cannot switch to generation '~a'~%")
+ pattern)))
+ (process-actions (alist-delete 'switch-generation opts)))
+ (_ #f))
+ opts))
((and (assoc-ref opts 'delete-generations)
(not dry-run?))
- (filter-map
+ (for-each
(match-lambda
(('delete-generations . pattern)
(cond ((not (file-exists? profile)) ; XXX: race condition
diff --git a/tests/guix-package.sh b/tests/guix-package.sh
index e35871f2a2..3e0e36fa23 100644
--- a/tests/guix-package.sh
+++ b/tests/guix-package.sh
@@ -87,6 +87,8 @@ then
# Exit with 1 when a generation does not exist.
if guix package -p "$profile" --list-generations=42;
then false; else true; fi
+ if guix package -p "$profile" --switch-generation=99;
+ then false; else true; fi
# Remove a package.
guix package --bootstrap -p "$profile" -r "guile-bootstrap"
@@ -101,6 +103,12 @@ then
test "`readlink_base "$profile"`" = "$profile-1-link"
test -x "$profile/bin/guile" && ! test -x "$profile/bin/make"
+ # Switch to the rolled generation and switch back.
+ guix package -p "$profile" --switch-generation=2
+ test "`readlink_base "$profile"`" = "$profile-2-link"
+ guix package -p "$profile" --switch-generation=-1
+ test "`readlink_base "$profile"`" = "$profile-1-link"
+
# Move to the empty profile.
for i in `seq 1 3`
do
@@ -133,10 +141,12 @@ then
grep "`guix build -e "$boot_make"`" "$profile/manifest"
# Make a "hole" in the list of generations, and make sure we can
- # roll back "over" it.
+ # roll back and switch "over" it.
rm "$profile-1-link"
guix package --bootstrap -p "$profile" --roll-back
test "`readlink_base "$profile"`" = "$profile-0-link"
+ guix package -p "$profile" --switch-generation=+1
+ test "`readlink_base "$profile"`" = "$profile-2-link"
# Make sure LIBRARY_PATH gets listed by `--search-paths'.
guix package --bootstrap -p "$profile" -i guile-bootstrap -i gcc-bootstrap