archive: preserve pre-open original atime, fixes #6194 #9180
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When creating an archive with --atime on platforms without O_NOATIME, opening a file for reading could update atime before we recorded it (thus we archived the updated atime, not the original one). Capture pre-open path-based-stat atime and use it if it pre-dates the atime we got from the fd AND if it refers to same fs object (avoid race condition).
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #9180 +/- ##
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Coverage 81.08% 81.09%
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Files 78 78
Lines 13659 13663 +4
Branches 2043 2044 +1
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+ Hits 11076 11080 +4
Misses 1910 1910
Partials 673 673 ☔ View full report in Codecov by Sentry. |
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difficult to test in master: windows is too broken, lots of fail in cygwin. |
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When creating an archive with --atime on platforms without O_NOATIME, opening a file for reading could update atime before we recorded it (thus we archived the updated atime, not the original one).
Capture pre-open path-based-stat atime and use it
if it pre-dates the atime we got from the fd AND
if it refers to same fs object (avoid race condition).