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Factor out nix::maybeLstat

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This function is nice for more than `PosixSourceAccessor`. We can make a
few things simpler with it.

Note that the error logic slightly changes in some of the call sites, in
that we also count `ENOTDIR` and not just `ENOENT` as not having the
file, but that should be fine.
This commit is contained in:
John Ericson 2024-03-29 15:21:10 -04:00
parent eeecbb9c36
commit 8be347afca
5 changed files with 36 additions and 37 deletions
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18
src/libstore/builtins/buildenv.cc
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@ -64,9 +64,9 @@ static void createLinks(State & state, const Path & srcDir, const Path & dstDir,
continue;
else if (S_ISDIR(srcSt.st_mode)) {
struct stat dstSt;
auto res = lstat(dstFile.c_str(), &dstSt);
if (res == 0) {
auto dstStOpt = maybeLstat(dstFile.c_str());
if (dstStOpt) {
auto & dstSt = *dstStOpt;
if (S_ISDIR(dstSt.st_mode)) {
createLinks(state, srcFile, dstFile, priority);
continue;
@ -82,14 +82,13 @@ static void createLinks(State & state, const Path & srcDir, const Path & dstDir,
createLinks(state, srcFile, dstFile, priority);
continue;
}
} else if (errno != ENOENT)
throw SysError("getting status of '%1%'", dstFile);
}
}
else {
struct stat dstSt;
auto res = lstat(dstFile.c_str(), &dstSt);
if (res == 0) {
auto dstStOpt = maybeLstat(dstFile.c_str());
if (dstStOpt) {
auto & dstSt = *dstStOpt;
if (S_ISLNK(dstSt.st_mode)) {
auto prevPriority = state.priorities[dstFile];
if (prevPriority == priority)
@ -104,8 +103,7 @@ static void createLinks(State & state, const Path & srcDir, const Path & dstDir,
throw SysError("unlinking '%1%'", dstFile);
} else if (S_ISDIR(dstSt.st_mode))
throw Error("collision between non-directory '%1%' and directory '%2%'", srcFile, dstFile);
} else if (errno != ENOENT)
throw SysError("getting status of '%1%'", dstFile);
}
}
createSymlink(srcFile, dstFile);