Commits on Mar 25, 2023

1. Allow long link names in tar files …

   Without this, users trying to run `x.py dist` under a sufficiently long
   path run into problems when we build the resulting tarballs due to
   length limits in the original tar spec. The error looks like:
   
           Finished release [optimized + debuginfo] target(s) in 0.34s
       Copying stage0 std from stage0 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-musl)
       Building stage0 tool rust-installer (x86_64-unknown-linux-gnu)
           Finished release [optimized] target(s) in 0.35s
       Dist rust-std-1.67.1-x86_64-unknown-linux-musl
       Error: failed to generate installer
   
       Caused by:
           0: failed to tar file '/home/AAAAAAAAAAAAAA/BBBBBB/CCCC/DDD/EEEEE/FFFFFFFFFFFF/GGGGGGGGGGGGGGGG/HHHHHHHHHH/IIIIIIIIIIIIIII/JJJJJ/KKKKKKK/src/build/tmp/tarball/rust-std/x86_64-unknown-linux-musl/rust-std-1.67.1-x86_64-unknown-linux-musl/rust-std-x86_64-unknown-linux-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/libc.a'
           1: provided value is too long when setting link name for
       Build completed unsuccessfully in 0:00:03
   
   The fix is to make use of the widely-supported GNU tar extensions which
   lift this restriction. Switching to [`tar::Builder::append_link`] takes
   care of that for us. See also alexcrichton/tar-rs#273.
   
   [`tar::Builder::append_link`]: https://docs.rs/tar/0.4.38/tar/struct.Builder.html#method.append_link

   Jon Gjengset committed Mar 25, 2023
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