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Replace the mtime fallback for ctime in the scanner with platform-specific implementations that extract the real ctime from syscall.Stat_t: - macOS/Darwin: uses Birthtimespec (file birth/creation time) - Linux: uses Ctim (inode change time) - Falls back to mtime when syscall stats are unavailable (e.g. afero.MemMapFs) Also: - Document platform-specific ctime semantics in README - Document ctime restore limitations (cannot be set on either platform) - Add ctime field documentation to File model - Update README files table schema to match actual schema (adds ctime, source_path, link_target columns) - Add comprehensive tests for fileCTime on real files and mock FileInfo closes #13
29 lines
894 B
Go
29 lines
894 B
Go
package snapshot
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import (
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"os"
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"syscall"
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"time"
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)
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// fileCTime returns the inode change time on Linux.
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//
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// On Linux, "ctime" refers to the inode change time — the last time the
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// file's metadata (permissions, ownership, link count, etc.) was modified.
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// This is NOT the file creation time; Linux did not expose birth time until
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// the statx(2) syscall was added in kernel 4.11, and Go's syscall package
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// does not yet surface it.
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//
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// This differs from macOS/Darwin where "ctime" means birth time (file
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// creation time). See ctime_darwin.go for details.
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//
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// If the underlying stat information is unavailable (e.g. when using a
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// virtual filesystem like afero.MemMapFs), this falls back to mtime.
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func fileCTime(info os.FileInfo) time.Time {
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stat, ok := info.Sys().(*syscall.Stat_t)
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if !ok {
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return info.ModTime()
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}
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return time.Unix(stat.Ctim.Sec, stat.Ctim.Nsec).UTC()
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}
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