diagnose.c: add option to configure archive contents

Update 'create_diagnostics_archive()' to take an argument 'mode'. When
archiving diagnostics for a repository, 'mode' is used to selectively
include/exclude information based on its value. The initial options for
'mode' are:

* DIAGNOSE_NONE: do not collect any diagnostics or create an archive
  (no-op).
* DIAGNOSE_STATS: collect basic repository metadata (Git version, repo path,
  filesystem available space) as well as sizing and count statistics for the
  repository's objects and packfiles.
* DIAGNOSE_ALL: collect basic repository metadata, sizing/count statistics,
  and copies of the '.git', '.git/hooks', '.git/info', '.git/logs', and
  '.git/objects/info' directories.

These modes are introduced to provide users the option to collect
diagnostics without the sensitive information included in copies of '.git'
dir contents. At the moment, only 'scalar diagnose' uses
'create_diagnostics_archive()' (with a hardcoded 'DIAGNOSE_ALL' mode to
match existing functionality), but more callers will be introduced in
subsequent patches.

Finally, refactor from a hardcoded set of 'add_directory_to_archiver()'
calls to iterative invocations gated by 'DIAGNOSE_ALL'. This allows for
easier future modification of the set of directories to archive and improves
error reporting when 'add_directory_to_archiver()' fails.

Helped-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/scalar/scalar.c

@@ -534,7 +534,7 @@ static int cmd_diagnose(int argc, const char **argv)
 		goto diagnose_cleanup;
 	}
 
-	res = create_diagnostics_archive(&zip_path);
+	res = create_diagnostics_archive(&zip_path, DIAGNOSE_ALL);
 
 diagnose_cleanup:
 	strbuf_release(&zip_path);

diagnose.c

@@ -8,6 +8,11 @@
 #include "object-store.h"
 #include "packfile.h"
 
+struct archive_dir {
+	const char *path;
+	int recursive;
+};
+
 static void dir_file_stats_objects(const char *full_path, size_t full_path_len,
 				   const char *file_name, void *data)
 {
@@ -132,13 +137,25 @@ static int add_directory_to_archiver(struct strvec *archiver_args,
 	return res;
 }
 
-int create_diagnostics_archive(struct strbuf *zip_path)
+int create_diagnostics_archive(struct strbuf *zip_path, enum diagnose_mode mode)
 {
 	struct strvec archiver_args = STRVEC_INIT;
 	char **argv_copy = NULL;
 	int stdout_fd = -1, archiver_fd = -1;
 	struct strbuf buf = STRBUF_INIT;
-	int res;
+	int res, i;
+	struct archive_dir archive_dirs[] = {
+		{ ".git", 0 },
+		{ ".git/hooks", 0 },
+		{ ".git/info", 0 },
+		{ ".git/logs", 1 },
+		{ ".git/objects/info", 0 }
+	};
+
+	if (mode == DIAGNOSE_NONE) {
+		res = 0;
+		goto diagnose_cleanup;
+	}
 
 	stdout_fd = dup(STDOUT_FILENO);
 	if (stdout_fd < 0) {
@@ -177,12 +194,18 @@ int create_diagnostics_archive(struct strbuf *zip_path)
 	loose_objs_stats(&buf, ".git/objects");
 	strvec_push(&archiver_args, buf.buf);
 
-	if ((res = add_directory_to_archiver(&archiver_args, ".git", 0)) ||
-	    (res = add_directory_to_archiver(&archiver_args, ".git/hooks", 0)) ||
-	    (res = add_directory_to_archiver(&archiver_args, ".git/info", 0)) ||
-	    (res = add_directory_to_archiver(&archiver_args, ".git/logs", 1)) ||
-	    (res = add_directory_to_archiver(&archiver_args, ".git/objects/info", 0)))
-		goto diagnose_cleanup;
+	/* Only include this if explicitly requested */
+	if (mode == DIAGNOSE_ALL) {
+		for (i = 0; i < ARRAY_SIZE(archive_dirs); i++) {
+			if (add_directory_to_archiver(&archiver_args,
+						      archive_dirs[i].path,
+						      archive_dirs[i].recursive)) {
+				res = error_errno(_("could not add directory '%s' to archiver"),
+						  archive_dirs[i].path);
+				goto diagnose_cleanup;
+			}
+		}
+	}
 
 	strvec_pushl(&archiver_args, "--prefix=",
 		     oid_to_hex(the_hash_algo->empty_tree), "--", NULL);

diagnose.h

@@ -3,6 +3,12 @@
 
 #include "strbuf.h"
 
-int create_diagnostics_archive(struct strbuf *zip_path);
+enum diagnose_mode {
+	DIAGNOSE_NONE,
+	DIAGNOSE_STATS,
+	DIAGNOSE_ALL
+};
+
+int create_diagnostics_archive(struct strbuf *zip_path, enum diagnose_mode mode);
 
 #endif /* DIAGNOSE_H */