execute: support basic filesystem namespacing

1 files changed, 33 insertions, 0 deletions

diff --git a/util.c b/util.c
index 49f5b4be13..e9f7813b8b 100644
--- a/util.c
+++ b/util.c
@@ -1140,6 +1140,39 @@ bool path_startswith(const char *path, const char *prefix) {
         }
 }
 
+bool path_equal(const char *a, const char *b) {
+        assert(a);
+        assert(b);
+
+        if ((a[0] == '/') != (b[0] == '/'))
+                return false;
+
+        for (;;) {
+                size_t j, k;
+
+                a += strspn(a, "/");
+                b += strspn(b, "/");
+
+                if (*a == 0 && *b == 0)
+                        return true;
+
+                if (*a == 0 || *b == 0)
+                        return false;
+
+                j = strcspn(a, "/");
+                k = strcspn(b, "/");
+
+                if (j != k)
+                        return false;
+
+                if (memcmp(a, b, j) != 0)
+                        return false;
+
+                a += j;
+                b += k;
+        }
+}
+
 char *ascii_strlower(char *t) {
         char *p;