datasette publish heroku --tar option, closes #969

datasette/publish/heroku.py

@@ -24,6 +24,10 @@ def publish_subcommand(publish):
         default="datasette",
         help="Application name to use when deploying",
     )
+    @click.option(
+        "--tar",
+        help="--tar option to pass to Heroku, e.g. --tar=/usr/local/bin/gtar",
+    )
     def heroku(
         files,
         metadata,
@@ -44,6 +48,7 @@ def publish_subcommand(publish):
         about,
         about_url,
         name,
+        tar,
     ):
         fail_if_publish_binary_not_installed(
             "heroku", "Heroku", "https://cli.heroku.com"
@@ -127,8 +132,13 @@ def publish_subcommand(publish):
                 call(
                     ["heroku", "config:set", "-a", app_name, "{}={}".format(key, value)]
                 )
-
-            call(["heroku", "builds:create", "-a", app_name, "--include-vcs-ignore"])
+            tar_option = []
+            if tar:
+                tar_option = ["--tar", tar]
+            call(
+                ["heroku", "builds:create", "-a", app_name, "--include-vcs-ignore"]
+                + tar_option
+            )
 
 
 @contextmanager

docs/datasette-publish-heroku-help.txt

@@ -26,4 +26,7 @@ Options:
   --about TEXT                    About label for metadata
   --about_url TEXT                About URL for metadata
   -n, --name TEXT                 Application name to use when deploying
+  --tar TEXT                      --tar option to pass to Heroku, e.g.
+                                  --tar=/usr/local/bin/gtar
+
   --help                          Show this message and exit.

tests/test_publish_heroku.py

@@ -55,12 +55,22 @@ def test_publish_heroku(mock_call, mock_check_output, mock_which):
     runner = CliRunner()
     with runner.isolated_filesystem():
         open("test.db", "w").write("data")
-        result = runner.invoke(cli.cli, ["publish", "heroku", "test.db"])
+        result = runner.invoke(
+            cli.cli, ["publish", "heroku", "test.db", "--tar", "gtar"]
+        )
         assert 0 == result.exit_code, result.output
         mock_call.assert_has_calls(
             [
                 mock.call(
-                    ["heroku", "builds:create", "-a", "f", "--include-vcs-ignore"]
+                    [
+                        "heroku",
+                        "builds:create",
+                        "-a",
+                        "f",
+                        "--include-vcs-ignore",
+                        "--tar",
+                        "gtar",
+                    ]
                 ),
             ]
         )