From: Michael Tremer <michael.tremer@ipfire.org>
Date: Tue, 16 Aug 2022 15:32:02 +0000 (+0000)
Subject: tests: command: Check if something is a mountpoint
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=a88b80ec14e7ee44a93d031630493ede7615fbbd;p=people%2Fstevee%2Fpakfire.git

tests: command: Check if something is a mountpoint

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/tests/stub/command.c b/tests/stub/command.c
index 3fa7802d..458b50b3 100644
--- a/tests/stub/command.c
+++ b/tests/stub/command.c
@@ -19,6 +19,7 @@
 #############################################################################*/
 
 #include <linux/limits.h>
+#include <mntent.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -49,6 +50,45 @@ static int random_string(char* s, size_t length) {
 	return 0;
 }
 
+static int check_mountpoint(int argc, char* argv[]) {
+	if (argc < 1) {
+		fprintf(stderr, "check-mountpoint requires an argument\n");
+		return EXIT_FAILURE;
+	}
+
+	const char* mp = argv[0];
+	int r = 1;
+
+	FILE* f = fopen("/proc/self/mounts", "r");
+	if (!f) {
+		fprintf(stderr, "Could not open /proc/self/mounts: %m\n");
+		return 1;
+	}
+
+	// Walk through all mountpoints
+	for (;;) {
+		struct mntent* entry = getmntent(f);
+		if (!entry)
+			break;
+
+		// Check for match
+		if (strcmp(entry->mnt_dir, mp) == 0) {
+			r = 0;
+			break;
+		}
+	}
+
+	fclose(f);
+
+	// Print something useful
+	if (r)
+		printf("%s is not a mountpoint\n", mp);
+	else
+		printf("%s is a mointpoint\n", mp);
+
+	return r;
+}
+
 static int check_open_file_descriptors(int argc, char* argv[]) {
 	struct rlimit limits;
 	int r;
@@ -311,7 +351,10 @@ int main(int argc, char* argv[]) {
 	int (*callback)(int argc, char* argv[]) = NULL;
 	const char* command = argv[1];
 
-	if (strcmp(command, "check-open-file-descriptors") == 0)
+	if (strcmp(command, "check-mountpoint") == 0)
+		callback = check_mountpoint;
+
+	else if (strcmp(command, "check-open-file-descriptors") == 0)
 		callback = check_open_file_descriptors;
 
 	// Echo