[PATCH] Build newest versions unless specified, and upgrades.

[Mark H Weaver <mhw@netris.org>]

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Hello all,

Here's a preliminary patch that does two things:

* Changes 'guix-build' and 'guix-package --install' so that only the
  newest packages will be considered (unless a version number is
  specified).

* Implements 'guix-package --upgrade'.

Although I'm not aware of any functional problems with this code, I'm
not entirely pleased with its organization.  Nonetheless, I wanted to
make it available for early testing and comments.

I welcome suggestions on how to improve this code.

      Mark



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From 16cf486524502c1caebbd8831a8f6802640aeace Mon Sep 17 00:00:00 2001
From: Mark H Weaver <mhw@netris.org>
Date: Tue, 12 Feb 2013 01:24:21 -0500
Subject: [PATCH] Build newest versions unless specified, and implement
 upgrades.

* gnu/packages.scm (find-newest-available-packages):
  New exported procedure.

* guix-build.in (newest-available-packages, find-best-packages-by-name):
  New procedures.
  (find-package): Use find-best-packages-by-name, to guarantee that
  if a version number is not specified, only the newest versions will
  be considered.

* guix-package.in (%options): Add --upgrade/-u option.
  (newest-available-packages, find-best-packages-by-name, upgradeable?):
  New procedures.
  (find-package): Use find-best-packages-by-name, to guarantee that
  if a version number is not specified, only the newest versions will
  be considered.
  (process-actions): Implement upgrade option.
---
 gnu/packages.scm |   24 +++++++++++++++++-
 guix-build.in    |   16 ++++++++++--
 guix-package.in  |   71 ++++++++++++++++++++++++++++++++++++++++++++----------
 3 files changed, 95 insertions(+), 16 deletions(-)

diff --git a/gnu/packages.scm b/gnu/packages.scm
index 792fe44..04ca840 100644
--- a/gnu/packages.scm
+++ b/gnu/packages.scm
@@ -20,6 +20,8 @@
   #:use-module (guix packages)
   #:use-module (guix utils)
   #:use-module (ice-9 ftw)
+  #:use-module (ice-9 vlist)
+  #:use-module (ice-9 match)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-26)
   #:use-module (srfi srfi-39)
@@ -28,7 +30,8 @@
             %patch-directory
             %bootstrap-binaries-path
             fold-packages
-            find-packages-by-name))
+            find-packages-by-name
+            find-newest-available-packages))
 
 ;;; Commentary:
 ;;;
@@ -137,3 +140,22 @@ then only return packages whose version is equal to VERSION."
                        (cons package result)
                        result))
                  '()))
+
+(define (find-newest-available-packages)
+  "Return a vhash with elements of the form
+  (name newest-version newest-package ...)
+where the preferred package is listed first."
+
+  ;; FIXME: Currently, the preferred package is whichever one
+  ;; was found last by 'fold-packages'.  Find a better solution.
+  (fold-packages (lambda (p r)
+                   (let ((name    (package-name p))
+                         (version (package-version p)))
+                     (match (vhash-assoc name r)
+                       ((_ newest-so-far . pkgs)
+                        (case (version-compare version newest-so-far)
+                          ((>) (vhash-cons name `(,version ,p) r))
+                          ((=) (vhash-cons name `(,version ,p ,@pkgs) r))
+                          ((<) r)))
+                       (#f (vhash-cons name `(,version ,p) r)))))
+                 vlist-null))
diff --git a/guix-build.in b/guix-build.in
index 29241c7..3bfddeb 100644
--- a/guix-build.in
+++ b/guix-build.in
@@ -47,6 +47,7 @@ exec "${GUILE-@GUILE@}" -c "$startup" "@guilemoduledir@" "$0" "$@"
   #:use-module (guix utils)
   #:use-module (ice-9 format)
   #:use-module (ice-9 match)
+  #:use-module (ice-9 vlist)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-11)
   #:use-module (srfi srfi-26)
@@ -206,13 +207,24 @@ Build the given PACKAGE-OR-DERIVATION and return their output paths.\n"))
                  root (strerror (system-error-errno args)))
          (exit 1)))))
 
+  (define newest-available-packages
+    (memoize find-newest-available-packages))
+
+  (define (find-best-packages-by-name name version)
+    (if version
+        (find-packages-by-name name version)
+        (match (vhash-assoc name (newest-available-packages))
+          ((_ version pkgs ...) pkgs)
+          (#f '()))))
+
   (define (find-package request)
     ;; Return a package matching REQUEST.  REQUEST may be a package
     ;; name, or a package name followed by a hyphen and a version
-    ;; number.
+    ;; number.  If the version number is not present, return the
+    ;; preferred newest version.
     (let-values (((name version)
                   (package-name->name+version request)))
-      (match (find-packages-by-name name version)
+      (match (find-best-packages-by-name name version)
         ((p)                                      ; one match
          p)
         ((p x ...)                                ; several matches
diff --git a/guix-package.in b/guix-package.in
index 32d9afd..28b919f 100644
--- a/guix-package.in
+++ b/guix-package.in
@@ -52,6 +52,7 @@ exec "${GUILE-@GUILE@}" -c "$startup" "@guilemoduledir@" "$0" "$@"
   #:use-module (ice-9 format)
   #:use-module (ice-9 match)
   #:use-module (ice-9 regex)
+  #:use-module (ice-9 vlist)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-11)
   #:use-module (srfi srfi-26)
@@ -356,6 +357,9 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
         (option '(#\r "remove") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'remove arg result)))
+        (option '(#\u "upgrade") #t #f
+                (lambda (opt name arg result)
+                  (alist-cons 'upgrade arg result)))
         (option '("roll-back") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'roll-back? #t result)))
@@ -431,9 +435,20 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
                       (length req*))
                   (null? req*) req*))))
 
+  (define newest-available-packages
+    (memoize find-newest-available-packages))
+
+  (define (find-best-packages-by-name name version)
+    (if version
+        (find-packages-by-name name version)
+        (match (vhash-assoc name (newest-available-packages))
+          ((_ version pkgs ...) pkgs)
+          (#f '()))))
+
   (define (find-package name)
     ;; Find the package NAME; NAME may contain a version number and a
-    ;; sub-derivation name.
+    ;; sub-derivation name.  If the version number is not present,
+    ;; return the preferred newest version.
     (define request name)
 
     (define (ensure-output p sub-drv)
@@ -451,7 +466,7 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
                                     (substring name (+ 1 colon))))))
                   ((name version)
                    (package-name->name+version name)))
-      (match (find-packages-by-name name version)
+      (match (find-best-packages-by-name name version)
         ((p)
          (list name (package-version p) sub-drv (ensure-output p sub-drv)
                (package-transitive-propagated-inputs p)))
@@ -468,6 +483,20 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
         (()
          (leave (_ "~a: package not found~%") request)))))
 
+  (define (upgradeable? name current-version current-path)
+    ;; Return #t if there is a newer version available, or if the
+    ;; newest version if the same as the current one but the
+    ;; output path would be different than the current path.
+    (match (vhash-assoc name (newest-available-packages))
+      ((_ candidate-version pkg . rest)
+       (case (version-compare candidate-version current-version)
+         ((>) #t)
+         ((<) #f)
+         ((=) (let ((candidate-path (derivation-path->output-path
+                                     (package-derivation (%store) pkg))))
+                (not (string=? current-path candidate-path))))))
+      (#f #f)))
+
   (define (ensure-default-profile)
     ;; Ensure the default profile symlink and directory exist.
 
@@ -520,13 +549,32 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
         (begin
           (roll-back profile)
           (process-actions (alist-delete 'roll-back? opts)))
-        (let* ((install  (filter-map (match-lambda
-                                      (('install . (? store-path?))
-                                       #f)
-                                      (('install . package)
-                                       (find-package package))
-                                      (_ #f))
-                                     opts))
+        (let* ((installed (manifest-packages (profile-manifest profile)))
+               (upgrade-regexps (filter-map (match-lambda
+                                             (('upgrade . regexp)
+                                              (make-regexp regexp))
+                                             (_ #f))
+                                            opts))
+               (upgrade  (if (null? upgrade-regexps)
+                             '()
+                             (let ((newest (find-newest-available-packages)))
+                               (filter-map (match-lambda
+                                            ((name version output path _)
+                                             (and (any (cut regexp-exec <> name)
+                                                       upgrade-regexps)
+                                                  (upgradeable? name version path)
+                                                  (find-package name)))
+                                            (_ #f))
+                                           installed))))
+               (install  (append
+                          upgrade
+                          (filter-map (match-lambda
+                                       (('install . (? store-path?))
+                                        #f)
+                                       (('install . package)
+                                        (find-package package))
+                                       (_ #f))
+                                      opts)))
                (drv      (filter-map (match-lambda
                                       ((name version sub-drv
                                              (? package? package)
@@ -563,10 +611,7 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
                                          (match package
                                            ((name _ ...)
                                             (alist-delete name result))))
-                                       (fold alist-delete
-                                             (manifest-packages
-                                              (profile-manifest profile))
-                                             remove)
+                                       (fold alist-delete installed remove)
                                        install*))))
 
           (when (equal? profile %current-profile)
-- 
1.7.10.4