Fix packaging of git repo

`setup.py sdist` doesn't copy empty directories, as I found out after
a lot of head scratching. This breaks git repos, so we can't trust sdist
to copy our git repo into the source tarball of sagenb. So we'll store
the git repo separately as sagenb.git , and move it into place when
running spkg-install.

MANIFEST.in

@@ -1,8 +1,8 @@
-recursive-include sagenb *
-recursive-include sass *
-recursive-include util *
+graft sagenb
+graft sass
+graft util
 prune sass/src/.sass-cache
-recursive-include flask_version *
+graft flask_version
 include *.txt MANIFEST.in .gitignore dist.sh README.rst
-recursive-include .git *
+prune .git
 global-exclude *.pyc *.pyo *.orig *.rej *~ \#* *\# *.sassc *.scssc *.DS_Store

dist.sh

@@ -11,26 +11,29 @@ die () {
 
 cd ${0%/*}
 
+git diff --quiet ||
+    die "Uncommitted changes in sagenb - please commit, stash, or discard"
+
 rm -rf dist
 mkdir -p dist
 
-echo "Fetching source tarballs of (sub)dependencies of sagenb"
+echo "Fetching source tarballs of (sub)dependencies of sagenb to dist/"
 python util/fetch_deps.py dist || die "Couldn't fetch all (sub)dependencies"
 
+echo "Creating source tarball of sagenb itself in dist/"
+python setup.py sdist > sdist.log || die "Couldn't make sagenb source tarball"
+
 echo "Sanitizing sagenb git repo (with backup)"
-git diff --quiet ||
-    die "Uncommitted changes in sagenb - please commit, stash, or discard"
 mv .git .git-backup
 git init
 git fetch .git-backup
 git branch -f master FETCH_HEAD
 git gc --aggressive --prune=0
 
-echo "Creating source tarball of sagenb itself"
-python setup.py sdist || die "Couldn't make sagenb source tarball"
+echo "Moving sanitized sagenb git repo to dist/"
+mv .git dist/sagenb.git
 
 echo "Restoring backup of git repo"
-rm -rf .git
 mv .git-backup .git
 
 echo "Done!"