util-lib: move running_in_chroot() into virt.[ch]

It's a very weak kind of virtualization, after all.

src/basic/util.c

@@ -179,16 +179,6 @@ void rename_process(const char name[8]) {
         }
 }
 
-int running_in_chroot(void) {
-        int ret;
-
-        ret = files_same("/proc/1/root", "/");
-        if (ret < 0)
-                return ret;
-
-        return ret == 0;
-}
-
 noreturn void freeze(void) {
 
         /* Make sure nobody waits for us on a socket anymore */

src/basic/util.h

@@ -89,8 +89,6 @@ bool fstype_is_network(const char *fstype);
         assert_message_se((size_t) snprintf(buf, ELEMENTSOF(buf), fmt, __VA_ARGS__) < ELEMENTSOF(buf), \
                           "xsprintf: " #buf "[] must be big enough")
 
-int running_in_chroot(void);
-
 noreturn void freeze(void);
 
 void execute_directories(const char* const* directories, usec_t timeout, char *argv[]);

src/basic/virt.c

@@ -24,6 +24,7 @@
 #include <unistd.h>
 
 #include "fileio.h"
+#include "stat-util.h"
 #include "process-util.h"
 #include "string-table.h"
 #include "string-util.h"
@@ -412,6 +413,16 @@ int detect_virtualization(void) {
         return detect_vm();
 }
 
+int running_in_chroot(void) {
+        int ret;
+
+        ret = files_same("/proc/1/root", "/");
+        if (ret < 0)
+                return ret;
+
+        return ret == 0;
+}
+
 static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {
         [VIRTUALIZATION_NONE] = "none",
         [VIRTUALIZATION_KVM] = "kvm",

src/basic/virt.h

@@ -67,5 +67,7 @@ int detect_vm(void);
 int detect_container(void);
 int detect_virtualization(void);
 
+int running_in_chroot(void);
+
 const char *virtualization_to_string(int v) _const_;
 int virtualization_from_string(const char *s) _pure_;

src/systemctl/systemctl.c

@@ -82,6 +82,7 @@
 #include "util.h"
 #include "utmp-wtmp.h"
 #include "verbs.h"
+#include "virt.h"
 
 static char **arg_types = NULL;
 static char **arg_states = NULL;