Nandakumar Raghavan
8a8f22f1d8
When systemd-tmpfiles processes a 'z' (relabel) entry, fd_set_perms() unconditionally calls label_fix_full() even when mode, owner, and group already match. This causes setfilecon_raw() (SELinux) or xsetxattr() (SMACK) to write the security label even if it is already correct, which on some kernels updates the file's timestamps unnecessarily. Fix this by comparing the current label with the desired label before writing, and skipping the write when they already match. This is consistent with how fd_set_perms() already skips chmod/chown when the values are unchanged.
System and Service Manager
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