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Fix build hook error for libstore library users

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A library shouldn't require changes to the caller's argument handling,
especially if it doesn't have to, and indeed we don't have to.

This changes the lookup order to prioritize the hardcoded path to nix
if it exists. The static executable still finds itself through /proc
and the like.
This commit is contained in:
Robert Hensing 2023-06-14 22:57:42 +02:00
parent 9c6ede85fc
commit d2696cdd1e
8 changed files with 97 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

25
src/libstore/globals.cc
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@ -77,7 +77,30 @@ Settings::Settings()
allowedImpureHostPrefixes = tokenizeString<StringSet>("/System/Library /usr/lib /dev /bin/sh");
#endif
buildHook = getSelfExe().value_or("nix") + " __build-remote";
/* Set the build hook location
For builds we perform a self-invocation, so Nix has to be self-aware.
That is, it has to know where it is installed. We don't think it's sentient.
Normally, nix is installed according to `nixBinDir`, which is set at compile time,
but can be overridden. This makes for a great default that works even if this
code is linked as a library into some other program whose main is not aware
that it might need to be a build remote hook.
However, it may not have been installed at all. For example, if it's a static build,
there's a good chance that it has been moved out of its installation directory.
That makes `nixBinDir` useless. Instead, we'll query the OS for the path to the
current executable, using `getSelfExe()`.
As a last resort, we resort to `PATH`. Hopefully we find a `nix` there that's compatible.
If you're porting Nix to a new platform, that might be good enough for a while, but
you'll want to improve `getSelfExe()` to work on your platform.
*/
std::string nixExePath = nixBinDir + "/nix";
if (!pathExists(nixExePath)) {
nixExePath = getSelfExe().value_or("nix");
}
buildHook = nixExePath + " __build-remote";
}
void loadConfFile()