util: move on_ac_power() from util.c -> udev-util.c

src/basic/util.c

@@ -6,7 +6,6 @@
 
 #include "alloc-util.h"
 #include "build.h"
-#include "dirent-util.h"
 #include "env-file.h"
 #include "env-util.h"
 #include "fd-util.h"
@@ -115,65 +114,6 @@ void in_initrd_force(bool value) {
         saved_in_initrd = value;
 }
 
-int on_ac_power(void) {
-        bool found_offline = false, found_online = false;
-        _cleanup_closedir_ DIR *d = NULL;
-        int r;
-
-        d = opendir("/sys/class/power_supply");
-        if (!d)
-                return errno == ENOENT ? true : -errno;
-
-        FOREACH_DIRENT(de, d, return -errno) {
-                _cleanup_close_ int device_fd = -1;
-                _cleanup_free_ char *contents = NULL;
-                unsigned v;
-
-                device_fd = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC);
-                if (device_fd < 0) {
-                        if (IN_SET(errno, ENOENT, ENOTDIR))
-                                continue;
-
-                        return -errno;
-                }
-
-                r = read_virtual_file_at(device_fd, "type", SIZE_MAX, &contents, NULL);
-                if (r == -ENOENT)
-                        continue;
-                if (r < 0)
-                        return r;
-
-                delete_trailing_chars(contents, NEWLINE);
-
-                /* We assume every power source is AC, except for batteries. See
-                 * https://github.com/torvalds/linux/blob/4eef766b7d4d88f0b984781bc1bcb574a6eafdc7/include/linux/power_supply.h#L176
-                 * for defined power source types. Also see:
-                 * https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-power */
-                if (streq(contents, "Battery"))
-                        continue;
-
-                contents = mfree(contents);
-
-                r = read_virtual_file_at(device_fd, "online", SIZE_MAX, &contents, NULL);
-                if (r == -ENOENT)
-                        continue;
-                if (r < 0)
-                        return r;
-
-                delete_trailing_chars(contents, NEWLINE);
-
-                r = safe_atou(contents, &v);
-                if (r < 0)
-                        return r;
-                if (v > 0) /* At least 1 and 2 are defined as different types of 'online' */
-                        found_online = true;
-                else
-                        found_offline = true;
-        }
-
-        return found_online || !found_offline;
-}
-
 int container_get_leader(const char *machine, pid_t *pid) {
         _cleanup_free_ char *s = NULL, *class = NULL;
         const char *p;

src/basic/util.h

@@ -20,8 +20,6 @@ int prot_from_flags(int flags) _const_;
 bool in_initrd(void);
 void in_initrd_force(bool value);
 
-int on_ac_power(void);
-
 /* Note: log2(0) == log2(1) == 0 here and below. */
 
 #define CONST_LOG2ULL(x) ((x) > 1 ? (unsigned) __builtin_clzll(x) ^ 63U : 0)