[PATCH v4 03/11] scalar-diagnose: add directory to archiver more gently

["Victoria Dye via GitGitGadget" <gitgitgadget@gmail.com>]

From: Victoria Dye <vdye@github.com>

If a directory added to the 'scalar diagnose' archiver does not exist, warn
and return 0 from 'add_directory_to_archiver()' rather than failing with a
fatal error. This handles a failure edge case where the '.git/logs' has not
yet been created when running 'scalar diagnose', but extends to any
situation where a directory may be missing in the '.git' dir.

Now, when a directory is missing a warning is captured in the diagnostic
logs. This provides a user with more complete information than if 'scalar
diagnose' simply failed with an error.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Victoria Dye <vdye@github.com>
---
 contrib/scalar/scalar.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/contrib/scalar/scalar.c b/contrib/scalar/scalar.c
index 04046452284..b9092f0b612 100644
--- a/contrib/scalar/scalar.c
+++ b/contrib/scalar/scalar.c
@@ -266,14 +266,20 @@ static int add_directory_to_archiver(struct strvec *archiver_args,
 					  const char *path, int recurse)
 {
 	int at_root = !*path;
-	DIR *dir = opendir(at_root ? "." : path);
+	DIR *dir;
 	struct dirent *e;
 	struct strbuf buf = STRBUF_INIT;
 	size_t len;
 	int res = 0;
 
-	if (!dir)
+	dir = opendir(at_root ? "." : path);
+	if (!dir) {
+		if (errno == ENOENT) {
+			warning(_("could not archive missing directory '%s'"), path);
+			return 0;
+		}
 		return error_errno(_("could not open directory '%s'"), path);
+	}
 
 	if (!at_root)
 		strbuf_addf(&buf, "%s/", path);
-- 
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