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