caps: skip file capability checks on android

src/lxc/caps.c

@@ -225,6 +225,10 @@ static bool lxc_cap_is_set(cap_t caps, cap_value_t cap, cap_flag_t flag)
 
 bool lxc_file_cap_is_set(const char *path, cap_value_t cap, cap_flag_t flag)
 {
+	/* Android's bionic currently seems to lack support for cap_get_file(). */
+	#if IS_BIONIC
+	return true;
+	#else
 	bool cap_is_set;
 	cap_t caps;
 
@@ -243,6 +247,7 @@ bool lxc_file_cap_is_set(const char *path, cap_value_t cap, cap_flag_t flag)
 	cap_is_set = lxc_cap_is_set(caps, cap, flag);
 	cap_free(caps);
 	return cap_is_set;
+	#endif
 }
 
 bool lxc_proc_cap_is_set(cap_value_t cap, cap_flag_t flag)

src/lxc/conf.c

@@ -3254,7 +3254,7 @@ static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap)
 		goto cleanup;
 	}
 
-	#if HAVE_LIBCAP
+	#if HAVE_LIBCAP && !IS_BIONIC
 	/* Check if it has the CAP_SETUID capability. */
 	if ((cap & CAP_SETUID) &&
 	    lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) &&
@@ -3274,6 +3274,10 @@ static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap)
 		fret = 1;
 		goto cleanup;
 	}
+	#else
+	DEBUG("Cannot check for file capabilites as full capability support is "
+	      "missing. Manual intervention needed.");
+	fret = 1;
 	#endif
 
 cleanup: