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libutil: Get rid of restartableSourceFromFactory

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Instead we can just seek back in the file - duh. Also this makes use
of the anonymous temp file facility, since that is much safer (no need
window where the we don't have an open file descriptor for it).
This commit is contained in:
Sergei Zimmerman 2025-12-01 04:21:27 +03:00
parent 4ad272015e
commit 4b3536e092
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4 changed files with 43 additions and 73 deletions
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16
src/libutil-tests/file-system.cc
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@ -398,4 +398,20 @@ TEST(createAnonymousTempFile, works)
EXPECT_EQ(source.drain(), "testtest");
}
/* ----------------------------------------------------------------------------
* FdSource
* --------------------------------------------------------------------------*/
TEST(FdSource, restartWorks)
{
auto fd = createAnonymousTempFile();
writeFull(fd.get(), "hello world");
lseek(fd.get(), 0, SEEK_SET);
FdSource source{fd.get()};
EXPECT_EQ(source.drain(), "hello world");
source.restart();
EXPECT_EQ(source.drain(), "hello world");
EXPECT_EQ(source.drain(), "");
}
} // namespace nix