Replace XLogRecPtr with Lsn in wal_service.rs .
This removes the last use of XLogSegmentOffset and XLByteToSeg, so
delete them. (replaced by Lsn::segment_offset and Lsn::segment_number.)
Our builds can be a little inconsistent, because Cargo doesn't deal well
with workspaces where there are multiple crates which have different
dependencies that select different features. As a workaround, copy what
other big rust projects do: add a workspace_hack crate.
This crate just pins down a set of dependencies and features that
satisfies all of the workspace crates.
The benefits are:
- running `cargo build` from one of the workspace subdirectories now
works without rebuilding anything.
- running `cargo install` works (without rebuilding anything).
- making small dependency changes is much less likely to trigger large
dependency rebuilds.
A few things that Eric commented on at PR #96:
- Use thiserror to simplify the implemention of FilePathError
- Add unit tests
- Fix a few complaints from clippy
- remove needless return
- remove needless format!
- remove a few more needless clone()
- from_str_radix(_, 10) -> .parse()
- remove needless reference
- remove needless `mut`
Also manually replaced a match statement with map_err() because after
clippy was done with it, there was almost nothing left in the match
expression.
The postgres_ext.h isn't found in vendor/postgres, if the Postgres
was restored from cache instead of building it in vendor/postgres.
To fix, change include path to point into tmp_install/include where the
headers are installed, instead of the vendor/postgres source dir.
