commit 554626ada769abf82a5dabe6966afa4265acb6a6
author Ned Deily <nad@python.org> Mon Mar 20 23:41:52 2017 -0400
committer GitHub <noreply@github.com> Mon Mar 20 23:41:52 2017 -0400
tree 062ff3ddcc18bd5e92fbbeca9d176bbda52e230f
parent 4830f581af57dd305c02c1fd72299ecb5b090eca

bpo-27593: Revise git SCM build info. (#744)

Use --short form of git hash.  Use output from "git describe" for tag.

Expected outputs:
1. previous hg
2. previous git
3. updated git

Release (tagged) build:
1. Python 3.7.0a0 (v3.7.0a0:4def2a2901a5, ...
2. Python 3.7.0a0 (v3.7.0a0^0:05f53735c8912f8df1077e897f052571e13c3496, ...
3. Python 3.7.0a0 (v3.7.0a0:05f53735c8, ...

Development build:
1. Python 3.7.0a0 (default:41df79263a11, ...
2. Python 3.7.0a0 (master:05f53735c8912f8df1077e897f052571e13c3496, ...
3. Python 3.7.0a0 (heads/master-dirty:05f53735c8, ...

"dirty" means the working tree has uncommitted changes.
See "git help describe" for more info.

configure.ac

diff --git a/configure.ac b/configure.ac
index 6e78bb6..aca8255 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,8 +37,8 @@
 fi
 if test $HAS_GIT = found
 then
-    GITVERSION="git -C \$(srcdir) rev-parse HEAD"
-    GITTAG="git -C \$(srcdir) name-rev --tags --name-only HEAD"
+    GITVERSION="git -C \$(srcdir) rev-parse --short HEAD"
+    GITTAG="git -C \$(srcdir) describe --all --always --dirty"
     GITBRANCH="git -C \$(srcdir) name-rev --name-only HEAD"
 else
     GITVERSION=""