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Register flake source trees as GC roots

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This ensures that flakes don't get garbage-collected, which is
important to get nix-channel-like behaviour.

For example, running

  $ nix build hydra:

will create a GC root

  ~/.cache/nix/flake-closures/hydra -> /nix/store/xarfiqcwa4w8r4qpz1a769xxs8c3phgn-flake-closure

where the contents/references of the linked file in the store are the
flake source trees used by the 'hydra' flake:

  /nix/store/n6d5f5lkpfjbmkyby0nlg8y1wbkmbc7i-source
  /nix/store/vbkg4zy1qd29fnhflsv9k2j9jnbqd5m2-source
  /nix/store/z46xni7d47s5wk694359mq9ay353ar94-source

Note that this in itself is not enough to allow offline use; the
fetcher for the flakeref (e.g. fetchGit or downloadCached) must not
fail if it cannot fetch the latest version of the file, so long as it
knows a cached version.

Issue #2868.
This commit is contained in:
Eelco Dolstra 2019-05-23 23:42:13 +02:00
parent 6b77bfc28d
commit 90fe1dfd2f
3 changed files with 63 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

19
tests/flakes.sh
View file

@ -5,7 +5,10 @@ if [[ -z $(type -p git) ]]; then
exit 99
fi
export _NIX_FORCE_HTTP=1
clearStore
rm -rf $TEST_HOME/.cache
registry=$TEST_ROOT/registry.json
@ -14,7 +17,7 @@ flake2Dir=$TEST_ROOT/flake2
flake3Dir=$TEST_ROOT/flake3
for repo in $flake1Dir $flake2Dir $flake3Dir; do
rm -rf $repo
rm -rf $repo $repo.tmp
mkdir $repo
git -C $repo init
git -C $repo config user.email "foobar@example.com"
@ -142,7 +145,7 @@ nix build -o $TEST_ROOT/result --flake-registry $registry flake2:bar
# Or without a registry.
# FIXME: shouldn't need '--flake-registry /no-registry'?
nix build -o $TEST_ROOT/result --flake-registry /no-registry file://$flake2Dir:bar
nix build -o $TEST_ROOT/result --flake-registry /no-registry file://$flake2Dir:bar --tarball-ttl 0
# Test whether indirect dependencies work.
nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir:xyzzy
@ -184,3 +187,15 @@ nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir:sth 2>&1 |
nix flake list --flake-registry file://$registry | grep -q flake3
mv $registry $registry.tmp
nix flake list --flake-registry file://$registry --tarball-ttl 0 | grep -q flake3
mv $registry.tmp $registry
# Test whether flakes are registered as GC roots for offline use.
rm -rf $TEST_HOME/.cache
nix build -o $TEST_ROOT/result --flake-registry file://$registry file://$flake2Dir:bar
mv $flake1Dir $flake1Dir.tmp
mv $flake2Dir $flake2Dir.tmp
nix-store --gc
nix build -o $TEST_ROOT/result --flake-registry file://$registry file://$flake2Dir:bar
nix build -o $TEST_ROOT/result --flake-registry file://$registry file://$flake2Dir:bar --tarball-ttl 0
mv $flake1Dir.tmp $flake1Dir
mv $flake2Dir.tmp $flake2Dir