nix-super/tests/functional/local-overlay-store/common.sh

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source ../common.sh
# The new Linux mount interface does not seem to support remounting
# OverlayFS mount points.
#
# It is not clear whether this is intentional or not:
#
# The kernel source code [1] would seem to indicate merely remounting
# while *changing* mount options is now an error because it erroneously
# succeeded (by ignoring those new options) before. However, we are
# *not* trying to remount with changed options, and are still hitting
# the failure when using the new interface.
#
# For further details, see these `util-linux` issues:
#
# - https://github.com/util-linux/util-linux/issues/2528
# - https://github.com/util-linux/util-linux/issues/2576
#
# In the meantime, setting this environment variable to "always" will
# force the use of the old mount interface, keeping the remounting
# working and these tests passing.
#
# [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/overlayfs/params.c?id=3006adf3be79cde4d14b1800b963b82b6e5572e0#n549
export LIBMOUNT_FORCE_MOUNT2=always
requireEnvironment () {
requireSandboxSupport
[[ $busybox =~ busybox ]] || skipTest "no busybox"
if [[ $(uname) != Linux ]]; then skipTest "Need Linux for overlayfs"; fi
needLocalStore "The test uses --store always so we would just be bypassing the daemon"
}
addConfig () {
echo "$1" >> "$NIX_CONF_DIR/nix.conf"
}
setupConfig () {
addConfig "require-drop-supplementary-groups = false"
addConfig "build-users-group = "
}
enableFeatures "local-overlay-store"
setupStoreDirs () {
# Attempt to create store dirs on tmpfs volume.
# This ensures lowerdir, upperdir and workdir will be on
# a consistent filesystem that fully supports OverlayFS.
storeVolume="$TEST_ROOT/stores"
mkdir -p "$storeVolume"
mount -t tmpfs tmpfs "$storeVolume" || true # But continue anyway if that fails.
storeA="$storeVolume/store-a"
storeBTop="$storeVolume/store-b"
storeBRoot="$storeVolume/merged-store"
storeB="local-overlay://?root=$storeBRoot&lower-store=$storeA&upper-layer=$storeBTop"
# Creating testing directories
mkdir -p "$storeVolume"/{store-a/nix/store,store-b,merged-store/nix/store,workdir}
}
# Mounting Overlay Store
mountOverlayfs () {
mount -t overlay overlay \
-o lowerdir="$storeA/nix/store" \
-o upperdir="$storeBTop" \
-o workdir="$storeVolume/workdir" \
"$storeBRoot/nix/store" \
|| skipTest "overlayfs is not supported"
cleanupOverlay () {
umount "$storeBRoot/nix/store"
rm -r $storeVolume/workdir
}
trap cleanupOverlay EXIT
}
remountOverlayfs () {
mount -o remount "$storeBRoot/nix/store"
}
toRealPath () {
storeDir=$1; shift
storePath=$1; shift
echo $storeDir$(echo $storePath | sed "s^${NIX_STORE_DIR:-/nix/store}^^")
}
initLowerStore () {
# Init lower store with some stuff
nix-store --store "$storeA" --add ../dummy
# Build something in lower store
drvPath=$(nix-instantiate --store $storeA ../hermetic.nix --arg withFinalRefs true --arg busybox "$busybox" --arg seed 1)
pathInLowerStore=$(nix-store --store "$storeA" --realise $drvPath)
}
execUnshare () {
exec unshare --mount --map-root-user "$SHELL" "$@"
}
2023-07-19 17:09:58 +03:00
addTextToStore() {
storeDir=$1; shift
filename=$1; shift
content=$1; shift
filePath="$TEST_HOME/$filename"
echo "$content" > "$filePath"
nix-store --store "$storeDir" --add "$filePath"
}