[PATCH v6+ 3/7] scalar: validate the optional enlistment argument

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From: Johannes Schindelin <johannes.schindelin@xxxxxx>

The `scalar` command needs a Scalar enlistment for many subcommands, and
looks in the current directory for such an enlistment (traversing the
parent directories until it finds one).

These is subcommands can also be called with an optional argument
specifying the enlistment. Here, too, we traverse parent directories as
needed, until we find an enlistment.

However, if the specified directory does not even exist, or is not a
directory, we should stop right there, with an error message.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
 contrib/scalar/scalar.c          | 6 ++++--
 contrib/scalar/t/t9099-scalar.sh | 5 +++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/contrib/scalar/scalar.c b/contrib/scalar/scalar.c
index 58ca0e56f1..6d58c7a698 100644
--- a/contrib/scalar/scalar.c
+++ b/contrib/scalar/scalar.c
@@ -43,9 +43,11 @@ static void setup_enlistment_directory(int argc, const char **argv,
 		usage_with_options(usagestr, options);
 
 	/* find the worktree, determine its corresponding root */
-	if (argc == 1)
+	if (argc == 1) {
 		strbuf_add_absolute_path(&path, argv[0]);
-	else if (strbuf_getcwd(&path) < 0)
+		if (!is_directory(path.buf))
+			die(_("'%s' does not exist"), path.buf);
+	} else if (strbuf_getcwd(&path) < 0)
 		die(_("need a working directory"));
 
 	strbuf_trim_trailing_dir_sep(&path);
diff --git a/contrib/scalar/t/t9099-scalar.sh b/contrib/scalar/t/t9099-scalar.sh
index 89781568f4..bb42354a8b 100755
--- a/contrib/scalar/t/t9099-scalar.sh
+++ b/contrib/scalar/t/t9099-scalar.sh
@@ -93,4 +93,9 @@ test_expect_success 'scalar supports -c/-C' '
 	test true = "$(git -C sub config core.preloadIndex)"
 '
 
+test_expect_success '`scalar [...] <dir>` errors out when dir is missing' '
+	! scalar run config cloned 2>err &&
+	grep "cloned. does not exist" err
+'
+
 test_done
-- 
2.36.1-385-g60203f3fdb




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