https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285630
Bug ID: 285630
Summary: makefs: cd9660 RockRidge extensions ignore timestamp
provided by -T
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: bnov...@freebsd.org
The cd9660 RockRidge extensions specify a TX record that stores the timestamp
from the underlying inode. However, makefs' implementation of the TF record
ignores a timestamp passed using the -T flag, making the resulting ISO image
nonreproducible.
This issue can be observed in the top-level directories by running 'diffoscope'
on two 'bootonly.iso' images that have been built back-to-back with a fixed
timestamp ('-T 1742574909'):
| drwx------ 18 0 0 4096 2025-03-21 16:35:09.000000 .
│ -drwxr-xr-x 2 0 0 6144 2025-03-24 14:48:55.000000 bin
│ --r-xr-xr-x 6 0 0 - 2025-03-24 14:48:55.000000 bin/cat
│ --r-xr-xr-x 6 0 0 - 2025-03-24 14:48:55.000000
bin/chflags
--snip--
| +drwxr-xr-x 2 0 0 6144 2025-03-24 14:57:38.000000 bin
│ +-r-xr-xr-x 6 0 0 - 2025-03-24 14:57:38.000000 bin/cat
│ +-r-xr-xr-x 6 0 0 - 2025-03-24 14:57:38.000000
bin/chflags
The dot directory record has the appropriate timestamp set, but the rest of the
directories do not.
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