Broken image for linux/arm/v7
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调研方向
首先检查 linux/arm/v7 的 Docker 镜像构建过程，以及它如何调用标准的 sh.rustup.rs 安装程序，然后重现报告的 cargo install 失败问题。当 linux/arm/v7 镜像能够正确安装 Rust，并且能够构建 Rust 项目而不出现报告中的架构或文件系统错误时，即视为完成。
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描述
Hi all,
I discovered a bit of a problem with the linux/arm/v7 version of the Rust image - attempting to build Rust projects with it breaks in various mysterious ways with errors like this:
> [builder 6/12] RUN cargo install cargo-build-dependencies:
#14 0.834 Updating crates.io index
#14 1.590 warning: spurious network error (2 tries remaining): could not read directory '/usr/local/cargo/registry/index/github.com-1285ae84e5963aae/.git//refs': Value too large for defined data type; class=Os (2)
#14 2.087 warning: spurious network error (1 tries remaining): could not read directory '/usr/local/cargo/registry/index/github.com-1285ae84e5963aae/.git//refs': Value too large for defined data type; class=Os (2)
#14 2.628 error: failed to fetch `https://github.com/rust-lang/crates.io-index`
#14 2.628
#14 2.628 Caused by:
#14 2.629 could not read directory '/usr/local/cargo/registry/index/github.com-1285ae84e5963aae/.git//refs': Value too large for defined data type; class=Os (2)
------
failed to solve: rpc error: code = Unknown desc = executor failed running [/bin/sh -c cargo install cargo-build-dependencies]: exit code: 101
I can't say for certain the cause, but I can say that if you install Rust on linux/arm/v7 using the "standard" sh.rustup.rs script, it is also broken, because of this function:
get_bitness() {
need_cmd head
# Architecture detection without dependencies beyond coreutils.
# ELF files start out "\x7fELF", and the following byte is
# 0x01 for 32-bit and
# 0x02 for 64-bit.
# The printf builtin on some shells like dash only supports octal
# escape sequences, so we use those.
local _current_exe_head
_current_exe_head=$(head -c 5 /proc/self/exe )
if [ "$_current_exe_head" = "$(printf '\177ELF\001')" ]; then
echo 32
elif [ "$_current_exe_head" = "$(printf '\177ELF\002')" ]; then
echo 64
else
err "unknown platform bitness"
fi
}
This fails to set the bitness to 32bit, instead falling through to "unknown platform bitness" (because no /proc/self/exe), resulting in a broken installation of Rust.
If the Docker image build uses that standard rustup script, that's probably why the image is also broken.
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