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https://github.com/privatevoid-net/nix-super.git
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45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
#include "indirect-root-store.hh"
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namespace nix {
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void IndirectRootStore::makeSymlink(const Path & link, const Path & target)
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{
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/* Create directories up to `gcRoot'. */
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createDirs(dirOf(link));
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/* Create the new symlink. */
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Path tempLink = fmt("%1%.tmp-%2%-%3%", link, getpid(), rand());
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createSymlink(target, tempLink);
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/* Atomically replace the old one. */
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std::filesystem::rename(tempLink, link);
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}
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Path IndirectRootStore::addPermRoot(const StorePath & storePath, const Path & _gcRoot)
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{
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Path gcRoot(canonPath(_gcRoot));
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if (isInStore(gcRoot))
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throw Error(
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"creating a garbage collector root (%1%) in the Nix store is forbidden "
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"(are you running nix-build inside the store?)",
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gcRoot);
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/* Register this root with the garbage collector, if it's
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running. This should be superfluous since the caller should
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have registered this root yet, but let's be on the safe
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side. */
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addTempRoot(storePath);
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/* Don't clobber the link if it already exists and doesn't
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point to the Nix store. */
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if (pathExists(gcRoot) && (!std::filesystem::is_symlink(gcRoot) || !isInStore(readLink(gcRoot))))
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throw Error("cannot create symlink '%1%'; already exists", gcRoot);
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makeSymlink(gcRoot, printStorePath(storePath));
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addIndirectRoot(gcRoot);
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return gcRoot;
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}
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}
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