On Sunday, December 22, 2013 9:32:57 AM UTC, Emmanuel Charpentier wrote:
>
> 1) working on another machine, with a brand-new sage tree, I have not been 
> able to get my work back :
> sage -dev checkout --ticket 15561
>

This does work. See the output of "git log":

$ git log -4
commit f570a62601eea75502fa2bab4431643fa1cbc2c7
Author: Emmanuel Charpentier <emm.charpent...@free.fr>
Date:   Sat Dec 21 14:53:58 2013 +0100

    Fixed patching of libpng.

commit de6e2ee221e49e7ccbcabf731e284b91df9bb919
Author: Emmanuel Charpentier <emm.charpent...@free.fr>
Date:   Sat Dec 21 14:30:32 2013 +0100

    Patching libpng to allow compilation of libfreetype-2.5.2

commit 5a4c66b9f9a45ea44e3ac9270311d6f68c05f1ae
Author: Emmanuel Charpentier <emm.charpent...@free.fr>
Date:   Sat Dec 21 09:39:35 2013 +0100

    Upgrading to current upstream stable release
    Also added license information to the SPKG.txt file.

commit 3472a854df051b57d1cb7e4934913f17f1fef820
Author: Volker Braun <vbraun.n...@gmail.com>
Date:   Tue Dec 17 18:08:15 2013 +0000

    Updated Sage version to 6.0

 

> sage -dev diff
> gives me an empty diff.
>

It shows you the diff relative to the current directory. If you were to 
make any (uncommitted) changes, then they would show up here. If you want 
to see the diff relative to an older version (say, the "master" branch), 
you'd have to do

sage -dev diff --base master

Or directly with git:

git diff master..HEAD    # HEAD=current branch head
git diff master..             # abbreviated version


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