I hosted a Minio server with customized CA for https. I have installed the CA to my NixOS. I confirmed it works that by running cUrl fetching Minio console before and after installing the CA.

Now I am trying to have sccache using Minio as backend storage. With these envs, sccache --start-server ran smoothly. sccache -s also reports reasonable data. No errors.

SCCACHE_BUCKET=sccache
SCCACHE_ENDPOINT=minio.magicloud.lan:443
SCCACHE_REGION=auto
SCCACHE_S3_ENABLE_VIRTUAL_HOST_STYLE=false
SCCACHE_S3_SERVER_SIDE_ENCRYPTION=false
SCCACHE_S3_USE_SSL=false

But cargo build in my project failed, with message:

error: process didn't exit successfully: `sccache /home/magicloud/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/bin/rustc -vV` (exit status: 2)
--- stderr
sccache: error: Server startup failed: cache storage failed to read: Unexpected (temporary) at read => send http request

Context:
   url: https://minio.magicloud.lan/sccache/.sccache_check
   called: http_util::Client::send
   service: s3
   path: .sccache_check
   range: 0-

Source:
   error sending request for url (https://minio.magicloud.lan/sccache/.sccache_check): client error (Connect): error:0A000086:SSL routines:tls_post_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:2124: (unable to get local issuer certificate): error:0A000086:SSL routines:tls_post_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:2124:

Backtrace:
   0: <unknown>
   1: <unknown>
   2: <unknown>
   3: <unknown>
   4: <unknown>
   5: <unknown>
   6: <unknown>
   7: <unknown>
   8: <unknown>
   9: <unknown>
  10: <unknown>
  11: <unknown>
  12: <unknown>
  13: <unknown>
  14: <unknown>
  15: __libc_start_call_main
  16: __libc_start_main_alias_1
  17: <unknown>


Run with SCCACHE_LOG=debug SCCACHE_NO_DAEMON=1 to get more information

Two problems actually. One, cargo is trying to start its own sccache server, regardless the one I started. Two, if I stopped the one I started, I still got this error seems indicating that sccache does not use system trusted CAs.

My .cargo/config.toml is

[build]
target = ["x86_64-unknown-linux-musl"]
rustc-wrapper = "/home/magicloud/.cargo/bin/sccache"

Sccache version is 0.12.0

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