[Emacs-diffs] trunk r116038: On VCS-independent ways of identifying commits, and why they are desirable.

[Eric S. Raymond]

------------------------------------------------------------
revno: 116038
revision-id: address@hidden
parent: address@hidden
committer: Eric S. Raymond <address@hidden>
branch nick: trunk
timestamp: Thu 2014-01-16 00:50:26 -0500
message:
  On VCS-independent ways of identifying commits, and why they are desirable.
  
  No code changes.
modified:
  Makefile.in                    makefile.in-20091113204419-o5vbwnq5f7feedwu-446
  admin/ChangeLog                changelog-20091113204419-o5vbwnq5f7feedwu-2226
  admin/notes/commits            cvslogs-20091113204419-o5vbwnq5f7feedwu-8580

=== modified file 'Makefile.in'
--- a/Makefile.in       2014-01-13 19:48:17 +0000
+++ b/Makefile.in       2014-01-16 05:50:26 +0000
@@ -385,6 +385,7 @@
        cd $@ || exit;                                                  \
        boot=bootstrap-emacs$(EXEEXT);                                  \
        [ ! -x "$$boot" ] || boot='';                                   \
+       echo "VCSWITNESS: $$vcswitness";\
        $(MAKE) all $(MFLAGS)                                           \
          CC='${CC}' CFLAGS='${CFLAGS}' CPPFLAGS='${CPPFLAGS}'          \
          LDFLAGS='${LDFLAGS}' MAKE='${MAKE}' BOOTSTRAPEMACS="$$boot"   \

=== modified file 'admin/ChangeLog'
--- a/admin/ChangeLog   2014-01-15 19:38:44 +0000
+++ b/admin/ChangeLog   2014-01-16 05:50:26 +0000
@@ -1,3 +1,8 @@
+2014-01-16  Eric S. Raymond  <address@hidden>
+
+       * notes/commits: Add a 'graph on VCS-independent ways of
+       identifying commits and the desirability thereof.
+
 2014-01-15  Paul Eggert  <address@hidden>
 
        Fix copyright license notices for Adobe Unicode mapping files.

=== modified file 'admin/notes/commits'
--- a/admin/notes/commits       2011-11-17 09:09:20 +0000
+++ b/admin/notes/commits       2014-01-16 05:50:26 +0000
@@ -45,6 +45,15 @@
     for modern source-control systems with a global log, it's better to
     have something like "Regenerate configure".
 
+(4) (Added in 2014) In commit comments, and ChangLog files, it is best
+    to use ways of identifying revisions that are not dependent on a
+    particular version control system.  (At time of writing Emacs is
+    about to move to its third VCS and another move in the future is
+    not impossible.)  An excellent way to identify commits is by
+    quoting their summary line.  Another is with an action stamp - an
+    RFC3339 date followed by ! followed by the committer's email - for
+    example, "2014-01-16T05:43:address@hidden". Often, "my
+    previous commit" will suffice.
 
 Followup discussion:
 http://lists.gnu.org/archive/html/emacs-devel/2010-01/msg00897.html