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monitoring/postgres/fakestat.c

@@ -0,0 +1,38 @@
+#define _GNU_SOURCE
+#include <sys/stat.h>
+#include <dlfcn.h>
+
+/*
+ * Docker Desktop Linux / macOS host-bind-mount permissions compatibility shim.
+ * Masks directory permissions to satisfy PostgreSQL checkDataDir() (0700 requirement).
+ */
+
+int (*real_stat)(const char *path, struct stat *buf);
+int stat(const char *path, struct stat *buf) {
+    if (!real_stat) real_stat = dlsym(RTLD_NEXT, "stat");
+    int res = real_stat(path, buf);
+    if (res == 0 && S_ISDIR(buf->st_mode)) {
+        buf->st_mode &= ~(S_IRWXG | S_IRWXO);
+    }
+    return res;
+}
+
+int (*real_fstatat)(int dirfd, const char *pathname, struct stat *buf, int flags);
+int fstatat(int dirfd, const char *pathname, struct stat *buf, int flags) {
+    if (!real_fstatat) real_fstatat = dlsym(RTLD_NEXT, "fstatat");
+    int res = real_fstatat(dirfd, pathname, buf, flags);
+    if (res == 0 && S_ISDIR(buf->st_mode)) {
+        buf->st_mode &= ~(S_IRWXG | S_IRWXO);
+    }
+    return res;
+}
+
+int (*real_lstat)(const char *path, struct stat *buf);
+int lstat(const char *path, struct stat *buf) {
+    if (!real_lstat) real_lstat = dlsym(RTLD_NEXT, "lstat");
+    int res = real_lstat(path, buf);
+    if (res == 0 && S_ISDIR(buf->st_mode)) {
+        buf->st_mode &= ~(S_IRWXG | S_IRWXO);
+    }
+    return res;
+}