cgroup-util: check for SYSFS_MAGIC when detecting cgroup format
When nothing at all is mounted at /sys/fs/cgroup, the fs.f_type is SYSFS_MAGIC (0x62656572) which results in the confusing debug log: "Unknown filesystem type 62656572 mounted on /sys/fs/cgroup." Instead, if the f_type is SYSFS_MAGIC, a more accurate message is: "No filesystem is currently mounted on /sys/fs/cgroup."
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@ -2010,6 +2010,9 @@ int cg_unified_cached(bool flush) {
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unified_cache = CGROUP_UNIFIED_NONE;
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}
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}
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} else if (F_TYPE_EQUAL(fs.f_type, SYSFS_MAGIC)) {
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return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM),
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"No filesystem is currently mounted on /sys/fs/cgroup.");
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} else
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return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM),
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"Unknown filesystem type %llx mounted on /sys/fs/cgroup.",
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