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Add optional runtime fallback directory (#8610)

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Skyler Hawthorne 2023-10-25 12:08:01 -04:00 • committed by GitHub
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2 changed files with 33 additions and 4 deletions
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26
book/src/install.md
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@ -224,7 +224,7 @@ Or, create a symbolic link:
ln -Ts $PWD/runtime ~/.config/helix/runtime
```
If the above command fails to create a symbolic link because the file exists either move `~/.config/helix/runtime` to a new location or delete it, then run the symlink command above again.
If the above command fails to create a symbolic link because the file exists either move `~/.config/helix/runtime` to a new location or delete it, then run the symlink command above again.
#### Windows
@ -257,12 +257,32 @@ following order:
1. `runtime/` sibling directory to `$CARGO_MANIFEST_DIR` directory (this is intended for
developing and testing helix only).
2. `runtime/` subdirectory of OS-dependent helix user config directory.
3. `$HELIX_RUNTIME`.
4. `runtime/` subdirectory of path to Helix executable.
3. `$HELIX_RUNTIME`
4. Distribution-specific fallback directory (set at compile time—not run time—
with the `HELIX_DEFAULT_RUNTIME` environment variable)
5. `runtime/` subdirectory of path to Helix executable.
This order also sets the priority for selecting which file will be used if multiple runtime
directories have files with the same name.
#### Note to packagers
If you are making a package of Helix for end users, to provide a good out of
the box experience, you should set the `HELIX_DEFAULT_RUNTIME` environment
variable at build time (before invoking `cargo build`) to a directory which
will store the final runtime files after installation. For example, say you want
to package the runtime into `/usr/lib/helix/runtime`. The rough steps a build
script could follow are:
1. `export HELIX_DEFAULT_RUNTIME=/usr/lib/helix/runtime`
1. `cargo build --profile opt --locked --path helix-term`
1. `cp -r runtime $BUILD_DIR/usr/lib/helix/`
1. `cp target/opt/hx $BUILD_DIR/usr/bin/hx`
This way the resulting `hx` binary will always look for its runtime directory in
`/usr/lib/helix/runtime` if the user has no custom runtime in `~/.config/helix`
or `HELIX_RUNTIME`.
### Validating the installation
To make sure everything is set up as expected you should run the Helix health

11
helix-loader/src/lib.rs
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@ -60,7 +60,8 @@ pub fn initialize_log_file(specified_file: Option<PathBuf>) {
/// 1. sibling directory to `CARGO_MANIFEST_DIR` (if environment variable is set)
/// 2. subdirectory of user config directory (always included)
/// 3. `HELIX_RUNTIME` (if environment variable is set)
/// 4. subdirectory of path to helix executable (always included)
/// 4. `HELIX_DEFAULT_RUNTIME` (if environment variable is set *at build time*)
/// 5. subdirectory of path to helix executable (always included)
///
/// Postcondition: returns at least two paths (they might not exist).
fn prioritize_runtime_dirs() -> Vec<PathBuf> {
@ -81,6 +82,14 @@ fn prioritize_runtime_dirs() -> Vec<PathBuf> {
rt_dirs.push(dir.into());
}
// If this variable is set during build time, it will always be included
// in the lookup list. This allows downstream packagers to set a fallback
// directory to a location that is conventional on their distro so that they
// need not resort to a wrapper script or a global environment variable.
if let Some(dir) = std::option_env!("HELIX_DEFAULT_RUNTIME") {
rt_dirs.push(dir.into());
}
// fallback to location of the executable being run
// canonicalize the path in case the executable is symlinked
let exe_rt_dir = std::env::current_exe()