build-release-tarball: Stop using .gitattributes.

Unfortunately, GitHub's web UI for generating release tarballs uses
`.gitattributes` to control what files to download, and thus if you
downloaded a source tarball for older Zulip versions using the GitHub
web UI, you'd be missing important files.

We fix this for future releases by moving the blacklist out of
.gitattributes.

Fixes zulip#129.

.gitattributes

@@ -9,17 +9,3 @@
 *.png binary
 *.otf binary
 *.tif binary
-.gitignore export-ignore
-.gitattributes export-ignore
-/static/assets export-ignore
-/corporate export-ignore
-/static export-ignore
-/tools export-ignore
-/zilencer export-ignore
-/templates/corporate export-ignore
-/templates/zilencer export-ignore
-/puppet/zulip_internal export-ignore
-/zproject/test_settings.py export-ignore
-/zerver/fixtures export-ignore
-/zerver/tests export-ignore
-/frontend_tests export-ignore

tools/build-release-tarball

@@ -41,23 +41,29 @@ if ! git diff --exit-code >/dev/null; then
     exit 1
 fi
 
-TMP_CHECKOUT=$TMPDIR/$prefix/
+TMP_CHECKOUT=$TMPDIR/$prefix
 TARBALL=$TMPDIR/$prefix.tar
+BASEDIR=$(pwd)
 
 # .gitattributes lists the files that are not exported
 git archive -o "$TARBALL" "--prefix=$prefix/" HEAD
 
+cd "$TMPDIR"
+tar -xf "$TARBALL"
+for i in `cat "$TMP_CHECKOUT"/tools/release-tarball-exclude.txt`; do
+    rm -r --interactive=never "$TMP_CHECKOUT/$i";
+done
+tar -cf "$TARBALL" "$prefix"
+rm -rf "$prefix"
 
 if tar -tf "$TARBALL" | grep -q -e ^zerver/tests; then
-	echo "Excluded files remain in tarball!";
-	echo "Versions of git 1.8.1.1 - 1.8.1.6 have broken .gitattributes syntax";
-	exit 1;
-else
-	echo "Check for excluded files passed";
+    echo "BUG: Excluded files remain in tarball!"
+    exit 1
 fi
+cd "$BASEDIR"
 
 # Check out a temporary full copy of the index to generate static files
-git checkout-index -f -a --prefix "$TMP_CHECKOUT"
+git checkout-index -f -a --prefix "$TMP_CHECKOUT/"
 cd "$TMP_CHECKOUT"
 
 # create var/log directory in the new temporary checkout

tools/release-tarball-exclude.txt

@@ -0,0 +1,15 @@
+.gitignore
+.gitattributes
+static/assets
+corporate/
+static/
+tools/
+zilencer/
+templates/corporate
+templates/zilencer
+puppet/zulip_ops
+zproject/dev_settings.py
+zproject/test_settings.py
+zerver/fixtures
+zerver/tests
+frontend_tests