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create pathAccessible, use it to infer default dirs

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This commit is contained in:
Yorick van Pelt 2023-05-26 15:32:28 +02:00
parent a6c78ba367
commit 2c462486fe
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5 changed files with 26 additions and 14 deletions
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11
src/libutil/util.cc
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@ -266,6 +266,17 @@ bool pathExists(const Path & path)
return false;
}
bool pathAccessible(const Path & path)
{
try {
return pathExists(path);
} catch (SysError & e) {
// swallow EPERM
if (e.errNo == EPERM) return false;
throw;
}
}
Path readLink(const Path & path)
{

8
src/libutil/util.hh
View file

@ -120,6 +120,14 @@ struct stat lstat(const Path & path);
*/
bool pathExists(const Path & path);
/**
* A version of pathExists that returns false on a permission error.
* Useful for inferring default paths across directories that might not
* be readable.
* @return true iff the given path can be accessed and exists
*/
bool pathAccessible(const Path & path);
/**
* Read the contents (target) of a symbolic link. The result is not
* in any way canonicalised.