[SCM] UNNAMED PROJECT branch, master, updated. 9241172c9dc41ac026f05837dc6f089b1a3745e0

[Ludovic Courtès]

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commit 9241172c9dc41ac026f05837dc6f089b1a3745e0
Author: Ludovic Courtès <address@hidden>
Date:   Thu Jan 17 22:41:47 2013 +0100

    guix-package: Allow `--roll-back' to skip missing generations.
    
    * guix-package.in (profile-numbers): New procedure.
      (latest-profile-number): Use it.
      (previous-profile-number): New procedure.
      (roll-back): Use it lieu of `1-'.  Check whether PREVIOUS-NUMBER is
      zero, and raise an error when it is.
    * tests/guix-package.sh: Test whether we can roll back over a "hole".

commit 24e262f086980a13d9d0a27615ed7eaec4aacbff
Author: Ludovic Courtès <address@hidden>
Date:   Thu Jan 17 22:20:42 2013 +0100

    guix-package: Add `--roll-back'.
    
    Based on a patch by Nikita Karetnikov <address@hidden>.
    
    * guix-package.in (profile-regexp): New procedure.
      (latest-profile-number): Remove `%profile-rx', and use
      `profile-regexp' instead.
      (profile-number, roll-back): New procedure.
      (show-help): Add `--roll-back'.
      (%options): Likewise.
      (guix-package)[process-actions]: First check whether `roll-back?' is
      among OPTS, and call `roll-back' if it is, followed by a recursive
      call to `process-actions'.  Emit the "nothing to be done" message only
      when INSTALL or REMOVE is non-empty.
    * tests/guix-package.sh (readlink_base): New function.
      Add tests for `--roll-back'.
    * doc/guix.texi (Invoking guix-package): Document `--roll-back'.

-----------------------------------------------------------------------

Summary of changes:
 doc/guix.texi         |    7 ++
 guix-package.in       |  265 ++++++++++++++++++++++++++++++-------------------
 tests/guix-package.sh |   45 ++++++++-
 3 files changed, 213 insertions(+), 104 deletions(-)


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