build(rust/driver/snowflake): include go source in package, add env override

[mbrobbel]

Closes #2783.

This adds a symlink to the go source to the Snowflake driver, which means cargo will include it in the package. This means the build script now works after packaging. This also adds support to override this with an env var (ADBC_GO_SRC_DIR).

[lidavidm]

Hmm, in lieu of the symlink, I don't mind the old approach, so long as it can be overridden by the release script

[mbrobbel]

Hmm, in lieu of the symlink, I don't mind the old approach, so long as it can be overridden by the release script

Is there a reason you don't want the symlink? If we don't have a symlink we must either:

1. accept that users must provide the Go Snowflake driver source to use this crate with the bundled feature, which means they must download/clone this repo elsewhere and set the env var to point to it.
2. copy the source files in the build script so they can be packaged

I think the package should be usable without doing anything special i.e. we should package the required source for the bundled feature. If we don't want a symlink I propose to do option 2.

[kou]

It may not be related to ADBC but... In general, UNIX style symlink doesn't work on Windows. For example, MSYS2 can't extract .tar.gz that has symlink. So apache/arrow resolves symlinks in its release process: https://github.com/apache/arrow/blob/5652af6631f8035d2c7fea9236767b6b392cbbac/dev/release/utils-create-release-tarball.sh#L46-L50

[mbrobbel]

It may not be related to ADBC but... In general, UNIX style symlink doesn't work on Windows. For example, MSYS2 can't extract .tar.gz that has symlink. So apache/arrow resolves symlinks in its release process: https://github.com/apache/arrow/blob/5652af6631f8035d2c7fea9236767b6b392cbbac/dev/release/utils-create-release-tarball.sh#L46-L50

As long as we package the crate for publishing on linux it will work fine on systems that don't support symlinks. The files will be copied into the package:

arrow-adbc/rust on  snowflake-publish [$] is 📦 v0.18.0 via 🦀 v1.86.0
❯ cargo package -p adbc_snowflake --list
.cargo_vcs_info.json
.gitignore
Cargo.lock
Cargo.toml
Cargo.toml.orig
README.md
build.rs
go/adbc/LICENSE.txt
go/adbc/adbc.go
go/adbc/driver/internal/driverbase/connection.go
go/adbc/driver/internal/driverbase/database.go
go/adbc/driver/internal/driverbase/driver.go
go/adbc/driver/internal/driverbase/driver_info.go
go/adbc/driver/internal/driverbase/driver_info_test.go
go/adbc/driver/internal/driverbase/driver_test.go
go/adbc/driver/internal/driverbase/error.go
go/adbc/driver/internal/driverbase/logging.go
go/adbc/driver/internal/shared_utils.go
go/adbc/driver/snowflake/binding.go
go/adbc/driver/snowflake/bulk_ingestion.go
go/adbc/driver/snowflake/bulk_ingestion_test.go
go/adbc/driver/snowflake/concat_reader.go
go/adbc/driver/snowflake/connection.go
go/adbc/driver/snowflake/driver.go
go/adbc/driver/snowflake/driver_test.go
go/adbc/driver/snowflake/queries/get_objects_all.sql
go/adbc/driver/snowflake/queries/get_objects_dbschemas.sql
go/adbc/driver/snowflake/queries/get_objects_tables.sql
go/adbc/driver/snowflake/queries/get_objects_terse_catalogs.sql
go/adbc/driver/snowflake/record_reader.go
go/adbc/driver/snowflake/snowflake_database.go
go/adbc/driver/snowflake/statement.go
go/adbc/ext.go
go/adbc/go.mod
go/adbc/go.sum
go/adbc/infocode_string.go
go/adbc/pkg/Makefile
go/adbc/pkg/_tmpl/driver.go.tmpl
go/adbc/pkg/_tmpl/utils.c.tmpl
go/adbc/pkg/_tmpl/utils.h.tmpl
go/adbc/pkg/doc.go
go/adbc/pkg/snowflake/driver.go
go/adbc/pkg/snowflake/utils.c
go/adbc/pkg/snowflake/utils.h
go/adbc/standard_schemas.go
go/adbc/status_string.go
go/adbc/tools.go
go/adbc/utils/utils.go
src/builder.rs
src/connection/builder.rs
src/connection.rs
src/database/builder.rs
src/database.rs
src/driver/builder.rs
src/driver.rs
src/duration.rs
src/lib.rs
src/statement.rs
tests/driver.rs

[kou]

Symlinks in source archive may have a problem when msys2/MINGW-packages#21803 is implemented. It's not related to Rust crates. We can solve it by resolving symlinks in release process like apache/arrow does.