nix-super/tests/local-overlay-store/verify-inner.sh

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#!/usr/bin/env bash
set -eu -o pipefail
set -x
source common.sh
# Avoid store dir being inside sandbox build-dir
unset NIX_STORE_DIR
unset NIX_STATE_DIR
storeDirs
initLowerStore
mountOverlayfs
## Initialise stores for test
# Realise a derivation from the lower store to propagate paths to overlay DB
nix-store --store "$storeB" --realise $drvPath
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# Also ensure dummy file exists in overlay DB
dummyPath=$(nix-store --store "$storeB" --add ../dummy)
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# Add something to the lower store that will not be propagated to overlay DB
lowerOnlyPath=$(addTextToStore "$storeA" lower-only "Only in lower store")
# Verify should be successful at this point
nix-store --store "$storeB" --verify --check-contents
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# Make a backup so we can repair later
backupStore="$storeVolume/backup"
mkdir "$backupStore"
tar -cC "$storeBRoot" nix | tar -xC "$backupStore"
## Deliberately corrupt store paths
# Delete one of the derivation inputs in the lower store
inputDrvFullPath=$(find "$storeA" -name "*-hermetic-input-1.drv")
inputDrvPath=${inputDrvFullPath/*\/nix\/store\///nix/store/}
rm -v "$inputDrvFullPath"
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# Truncate the contents of dummy file in lower store
find "$storeA" -name "*-dummy" -exec truncate -s 0 {} \;
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# Also truncate the file that only exists in lower store
truncate -s 0 "$storeA/$lowerOnlyPath"
# Ensure overlayfs is synchronised
remountOverlayfs
## Now test that verify and repair work as expected
# Verify overlay store without attempting to repair it
verifyOutput=$(expectStderr 1 nix-store --store "$storeB" --verify --check-contents)
<<<"$verifyOutput" grepQuiet "path '$inputDrvPath' disappeared, but it still has valid referrers!"
<<<"$verifyOutput" grepQuiet "path '$dummyPath' was modified! expected hash"
<<<"$verifyOutput" expectStderr 1 grepQuiet "$lowerOnlyPath" # Expect no error for corrupted lower-only path
# Attempt to repair using backup
addConfig "substituters = $backupStore"
repairOutput=$(nix-store --store "$storeB" --verify --check-contents --repair 2>&1)
<<<"$repairOutput" grepQuiet "copying path '$inputDrvPath'"
<<<"$repairOutput" grepQuiet "copying path '$dummyPath'"