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Merge pull request #10 from NixLayeredStore/delete
Fix and test deleting when lower store references
This commit is contained in:
commit
31112fd26f
8 changed files with 77 additions and 5 deletions
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@ -741,7 +741,7 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
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auto i = referrersCache.find(*path);
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if (i == referrersCache.end()) {
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StorePathSet referrers;
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queryReferrers(*path, referrers);
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queryGCReferrers(*path, referrers);
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referrersCache.emplace(*path, std::move(referrers));
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i = referrersCache.find(*path);
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}
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@ -138,6 +138,12 @@ void LocalOverlayStore::queryReferrers(const StorePath & path, StorePathSet & re
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}
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void LocalOverlayStore::queryGCReferrers(const StorePath & path, StorePathSet & referrers)
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{
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LocalStore::queryReferrers(path, referrers);
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}
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StorePathSet LocalOverlayStore::queryValidDerivers(const StorePath & path)
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{
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auto res = LocalStore::queryValidDerivers(path);
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@ -124,8 +124,17 @@ private:
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void optimiseStore() override;
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/**
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* For lower-store paths, we used the lower store location. This avoids the
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* wasteful "copying up" that would otherwise happen.
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*/
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Path toRealPathForHardLink(const StorePath & storePath) override;
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/**
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* Deletion only effects the upper layer, so we ignore lower-layer referrers.
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*/
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void queryGCReferrers(const StorePath & path, StorePathSet & referrers) override;
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void remountIfNecessary();
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std::atomic_bool _remountRequired = false;
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@ -230,6 +230,18 @@ public:
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void collectGarbage(const GCOptions & options, GCResults & results) override;
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/**
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* Called by `collectGarbage` to trace in reverse.
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*
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* Using this rather than `queryReferrers` directly allows us to
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* fine-tune which referrers we consider for garbage collection;
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* some store implementations take advantage of this.
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*/
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virtual void queryGCReferrers(const StorePath & path, StorePathSet & referrers)
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{
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return queryReferrers(path, referrers);
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}
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/**
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* Called by `collectGarbage` to recursively delete a path.
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* The default implementation simply calls `deletePath`, but it can be
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@ -37,7 +37,7 @@ let
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buildCommand = ''
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echo hi-input3
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read x < ${input2}
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echo $x BAZ > $out
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echo ${input2} $x BAZ > $out
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'';
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};
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@ -51,6 +51,6 @@ in
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''
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read x < ${input1}
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read y < ${input3}
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echo "$x $y" > $out
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echo ${input1} ${input3} "$x $y" > $out
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'';
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}
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39
tests/overlay-local-store/delete-refs-inner.sh
Normal file
39
tests/overlay-local-store/delete-refs-inner.sh
Normal file
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@ -0,0 +1,39 @@
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#!/usr/bin/env bash
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set -eu -o pipefail
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source common.sh
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# Avoid store dir being inside sandbox build-dir
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unset NIX_STORE_DIR
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unset NIX_STATE_DIR
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storeDirs
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initLowerStore
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mountOverlayfs
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export NIX_REMOTE="$storeB"
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stateB="$storeBRoot/nix/var/nix"
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hermetic=$(nix-build ../hermetic.nix --no-out-link --arg busybox "$busybox" --arg seed 2)
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input1=$(nix-build ../hermetic.nix --no-out-link --arg busybox "$busybox" --arg seed 2 -A passthru.input1 -j0)
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input2=$(nix-build ../hermetic.nix --no-out-link --arg busybox "$busybox" --arg seed 2 -A passthru.input2 -j0)
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input3=$(nix-build ../hermetic.nix --no-out-link --arg busybox "$busybox" --arg seed 2 -A passthru.input3 -j0)
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# Can't delete because referenced
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expectStderr 1 nix-store --delete $input1 | grepQuiet "Cannot delete path"
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expectStderr 1 nix-store --delete $input2 | grepQuiet "Cannot delete path"
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expectStderr 1 nix-store --delete $input3 | grepQuiet "Cannot delete path"
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# These same paths are referenced in the lower layer (by the seed 1
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# build done in `initLowerStore`).
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expectStderr 1 nix-store --store "$storeA" --delete $input2 | grepQuiet "Cannot delete path"
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expectStderr 1 nix-store --store "$storeA" --delete $input3 | grepQuiet "Cannot delete path"
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# Can delete
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nix-store --delete $hermetic
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# Now unreferenced in upper layer, can delete
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nix-store --delete $input3
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nix-store --delete $input2
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5
tests/overlay-local-store/delete-refs.sh
Executable file
5
tests/overlay-local-store/delete-refs.sh
Executable file
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@ -0,0 +1,5 @@
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source common.sh
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requireEnvironment
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setupConfig
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execUnshare ./delete-refs-inner.sh
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@ -4,9 +4,10 @@ overlay-local-store-tests := \
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$(d)/build.sh \
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$(d)/bad-uris.sh \
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$(d)/add-lower.sh \
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$(d)/delete-refs.sh \
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$(d)/delete-duplicate.sh \
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$(d)/gc.sh \
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$(d)/verify.sh \
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$(d)/optimise.sh \
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$(d)/delete-duplicate.sh
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$(d)/optimise.sh
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install-tests-groups += overlay-local-store
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