[ruby-core:121475] [Ruby Bug#21205] File::Stat#birthtime is available on Linux

[ruby-core:121475] [Ruby Bug#21205] File::Stat#birthtime is available on Linux

[BertramScharpf (Bertram Scharpf) via ruby-core]

Issue #21205 has been reported by BertramScharpf (Bertram Scharpf).

----------------------------------------
Bug #21205: File::Stat#birthtime is available on Linux
https://bugs.ruby-lang.org/issues/21205

* Author: BertramScharpf (Bertram Scharpf)
* Status: Open
* ruby -v: ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Not that I would run into any problem with it, but this behaviour is confusing:

    RbConfig::CONFIG["platform"]     #=> "amd64-freebsd14"
    (File.birthtime "/").class       #=> Time
    (File.stat "/").birthtime.class  #=> Time

    RbConfig::CONFIG["platform"]     #=> "x86_64-linux"
    (File.birthtime "/").class       #=> Time
    (File.stat "/").birthtime        # raises NotImplementedError




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[ruby-core:121476] [Ruby Bug#21205] File::Stat#birthtime is available on Linux

[byroot (Jean Boussier) via ruby-core]

Issue #21205 has been updated by byroot (Jean Boussier).


Contrary to FreeBSD, on Linux the `birthtime` isn't present in the struct returned by `stat(2)`: https://man7.org/linux/man-pages/man3/stat.3type.html (see how there is no `btime`).

What `File.birthtime` does, it that it uses `statx(2)` https://man7.org/linux/man-pages/man2/statx.2.html

So the only way to fix the weirdness you point out, would be for `File.stat` to actually use `statx(2)` under the hood.

But it returns a lot more data, so there might be some performance considerations.

That being said, perhaps we should do it for correctness, because unless I'm mistaken, on Linux `stat(2)` return 32bit time, so it will wrap around in 2038. `statx(2)` returns 64-bit timestamps, so it seems that Linux want users to migrate to `statx(2)` eventually.



----------------------------------------
Bug #21205: File::Stat#birthtime is available on Linux
https://bugs.ruby-lang.org/issues/21205#change-112494

* Author: BertramScharpf (Bertram Scharpf)
* Status: Open
* ruby -v: ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Not that I would run into any problem with it, but this behaviour is confusing:

    RbConfig::CONFIG["platform"]     #=> "amd64-freebsd14"
    (File.birthtime "/").class       #=> Time
    (File.stat "/").birthtime.class  #=> Time

    RbConfig::CONFIG["platform"]     #=> "x86_64-linux"
    (File.birthtime "/").class       #=> Time
    (File.stat "/").birthtime        # raises NotImplementedError




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[ruby-core:121479] [Ruby Bug#21205] File::Stat#birthtime is available on Linux

[BertramScharpf (Bertram Scharpf) via ruby-core]

Issue #21205 has been updated by BertramScharpf (Bertram Scharpf).


byroot (Jean Boussier) wrote in #note-1:
> Contrary to FreeBSD, on Linux the `birthtime` isn't present in the struct returned by `stat(2)`: https://man7.org/linux/man-pages/man3/stat.3type.html (see how there is no `btime`).

I know. I did research about that but gave up.

This is how I solved my problem for now: <https://github.com/BertramScharpf/rbfind/commit/e6ed59668cb5707f4519272401113a8173f819af>.


----------------------------------------
Bug #21205: File::Stat#birthtime is available on Linux
https://bugs.ruby-lang.org/issues/21205#change-112497

* Author: BertramScharpf (Bertram Scharpf)
* Status: Open
* ruby -v: ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Not that I would run into any problem with it, but this behaviour is confusing:

    RbConfig::CONFIG["platform"]     #=> "amd64-freebsd14"
    (File.birthtime "/").class       #=> Time
    (File.stat "/").birthtime.class  #=> Time

    RbConfig::CONFIG["platform"]     #=> "x86_64-linux"
    (File.birthtime "/").class       #=> Time
    (File.stat "/").birthtime        # raises NotImplementedError




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[ruby-core:121480] [Ruby Feature#21205] Make File::Stat#birthtime available on Linux

[byroot (Jean Boussier) via ruby-core]

Issue #21205 has been updated by byroot (Jean Boussier).

Tracker changed from Bug to Feature
Subject changed from File::Stat#birthtime is available on Linux to Make File::Stat#birthtime available on Linux
ruby -v deleted (ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-linux])
Backport deleted (3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN)

Switching this to a feature request.

----------------------------------------
Feature #21205: Make File::Stat#birthtime available on Linux
https://bugs.ruby-lang.org/issues/21205#change-112498

* Author: BertramScharpf (Bertram Scharpf)
* Status: Open
----------------------------------------
Not that I would run into any problem with it, but this behaviour is confusing:

    RbConfig::CONFIG["platform"]     #=> "amd64-freebsd14"
    (File.birthtime "/").class       #=> Time
    (File.stat "/").birthtime.class  #=> Time

    RbConfig::CONFIG["platform"]     #=> "x86_64-linux"
    (File.birthtime "/").class       #=> Time
    (File.stat "/").birthtime        # raises NotImplementedError




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