f85dc050ba
Nearly every Header obtained from FileInfoHeader via the FS has timestamps with sub-second resolution and the AccessTime and ChangeTime fields populated. This forces the PAX format to almost always be used, which has the following problems: * PAX is still not as widely supported compared to USTAR * The PAX headers will occupy at minimum 1KiB for every entry The old behavior of tar Writer had no support for sub-second resolution nor any support for AccessTime or ChangeTime, so had neither problem. Instead the Writer would just truncate sub-second information and ignore the AccessTime and ChangeTime fields. In this CL, we preserve the behavior such that the *default* behavior would output a USTAR header for most cases by truncating sub-second time measurements and ignoring AccessTime and ChangeTime. To use either of the features, users will need to explicitly specify that the format is PAX or GNU. The exact policy chosen is this: * USTAR and GNU may still be chosen even if sub-second measurements are present; they simply truncate the timestamp to the nearest second. As before, PAX uses sub-second resolutions. * If the Format is unspecified, then WriteHeader ignores AccessTime and ChangeTime when using the USTAR format. This ensures that USTAR may still be chosen for a vast majority of file entries obtained through FileInfoHeader. Updates #11171 Updates #17876 Change-Id: Icc5274d4245922924498fd79b8d3ae94d5717271 Reviewed-on: https://go-review.googlesource.com/59230 Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.
Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
Download and Install
Binary Distributions
Official binary distributions are available at https://golang.org/dl/.
After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.
Install From Source
If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.
Contributing
Go is the work of hundreds of contributors. We appreciate your help!
To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html
Note that the Go project does not use GitHub pull requests, and that we use the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.