lix/tests/fetchGit.sh
Graham Christensen 02098d2073 fetchGit: use a better caching scheme
The current usage technically works by putting multiple different
repos in to the same git directory. However, it is very slow as
Git tries very hard to find common commits between the two
repositories. If the two repositories are large (like Nixpkgs and
another long-running project,) it is maddeningly slow.

This change busts the cache for existing deployments, but users
will be promptly repaid in per-repository performance.
2018-08-17 11:27:34 -04:00

141 lines
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source common.sh
if [[ -z $(type -p git) ]]; then
echo "Git not installed; skipping Git tests"
exit 99
fi
clearStore
repo=$TEST_ROOT/git
rm -rf $repo ${repo}-tmp $TEST_HOME/.cache/nix/gitv2
git init $repo
git -C $repo config user.email "foobar@example.com"
git -C $repo config user.name "Foobar"
echo utrecht > $repo/hello
touch $repo/.gitignore
git -C $repo add hello .gitignore
git -C $repo commit -m 'Bla1'
rev1=$(git -C $repo rev-parse HEAD)
echo world > $repo/hello
git -C $repo commit -m 'Bla2' -a
rev2=$(git -C $repo rev-parse HEAD)
# Fetch the default branch.
path=$(nix eval --raw "(builtins.fetchGit file://$repo).outPath")
[[ $(cat $path/hello) = world ]]
# In pure eval mode, fetchGit without a revision should fail.
[[ $(nix eval --raw "(builtins.readFile (fetchGit file://$repo + \"/hello\"))") = world ]]
(! nix eval --pure-eval --raw "(builtins.readFile (fetchGit file://$repo + \"/hello\"))")
# Fetch using an explicit revision hash.
path2=$(nix eval --raw "(builtins.fetchGit { url = file://$repo; rev = \"$rev2\"; }).outPath")
[[ $path = $path2 ]]
# In pure eval mode, fetchGit with a revision should succeed.
[[ $(nix eval --pure-eval --raw "(builtins.readFile (fetchGit { url = file://$repo; rev = \"$rev2\"; } + \"/hello\"))") = world ]]
# Fetch again. This should be cached.
mv $repo ${repo}-tmp
path2=$(nix eval --raw "(builtins.fetchGit file://$repo).outPath")
[[ $path = $path2 ]]
[[ $(nix eval "(builtins.fetchGit file://$repo).revCount") = 2 ]]
[[ $(nix eval --raw "(builtins.fetchGit file://$repo).rev") = $rev2 ]]
# But with TTL 0, it should fail.
(! nix eval --tarball-ttl 0 "(builtins.fetchGit file://$repo)" -vvvvv)
# Fetching with a explicit hash should succeed.
path2=$(nix eval --tarball-ttl 0 --raw "(builtins.fetchGit { url = file://$repo; rev = \"$rev2\"; }).outPath")
[[ $path = $path2 ]]
path2=$(nix eval --tarball-ttl 0 --raw "(builtins.fetchGit { url = file://$repo; rev = \"$rev1\"; }).outPath")
[[ $(cat $path2/hello) = utrecht ]]
mv ${repo}-tmp $repo
# Using a clean working tree should produce the same result.
path2=$(nix eval --raw "(builtins.fetchGit $repo).outPath")
[[ $path = $path2 ]]
# Using an unclean tree should yield the tracked but uncommitted changes.
mkdir $repo/dir1 $repo/dir2
echo foo > $repo/dir1/foo
echo bar > $repo/bar
echo bar > $repo/dir2/bar
git -C $repo add dir1/foo
git -C $repo rm hello
path2=$(nix eval --raw "(builtins.fetchGit $repo).outPath")
[ ! -e $path2/hello ]
[ ! -e $path2/bar ]
[ ! -e $path2/dir2/bar ]
[ ! -e $path2/.git ]
[[ $(cat $path2/dir1/foo) = foo ]]
[[ $(nix eval --raw "(builtins.fetchGit $repo).rev") = 0000000000000000000000000000000000000000 ]]
# ... unless we're using an explicit ref or rev.
path3=$(nix eval --raw "(builtins.fetchGit { url = $repo; ref = \"master\"; }).outPath")
[[ $path = $path3 ]]
path3=$(nix eval --raw "(builtins.fetchGit { url = $repo; rev = \"$rev2\"; }).outPath")
[[ $path = $path3 ]]
# Committing should not affect the store path.
git -C $repo commit -m 'Bla3' -a
path4=$(nix eval --tarball-ttl 0 --raw "(builtins.fetchGit file://$repo).outPath")
[[ $path2 = $path4 ]]
# tarball-ttl should be ignored if we specify a rev
echo delft > $repo/hello
git -C $repo add hello
git -C $repo commit -m 'Bla4'
rev3=$(git -C $repo rev-parse HEAD)
nix eval --tarball-ttl 3600 "(builtins.fetchGit { url = $repo; rev = \"$rev3\"; })" >/dev/null
# Update 'path' to reflect latest master
path=$(nix eval --raw "(builtins.fetchGit file://$repo).outPath")
# Check behavior when non-master branch is used
git -C $repo checkout $rev2 -b dev
echo dev > $repo/hello
# File URI uses 'master' unless specified otherwise
path2=$(nix eval --raw "(builtins.fetchGit file://$repo).outPath")
[[ $path = $path2 ]]
# Using local path with branch other than 'master' should work when clean or dirty
path3=$(nix eval --raw "(builtins.fetchGit $repo).outPath")
# (check dirty-tree handling was used)
[[ $(nix eval --raw "(builtins.fetchGit $repo).rev") = 0000000000000000000000000000000000000000 ]]
# Committing shouldn't change store path, or switch to using 'master'
git -C $repo commit -m 'Bla5' -a
path4=$(nix eval --raw "(builtins.fetchGit $repo).outPath")
[[ $(cat $path4/hello) = dev ]]
[[ $path3 = $path4 ]]
# Confirm same as 'dev' branch
path5=$(nix eval --raw "(builtins.fetchGit { url = $repo; ref = \"dev\"; }).outPath")
[[ $path3 = $path5 ]]
# Nuke the cache
rm -rf $TEST_HOME/.cache/nix/gitv2
# Try again, but without 'git' on PATH
NIX=$(command -v nix)
# This should fail
(! PATH= $NIX eval --raw "(builtins.fetchGit { url = $repo; ref = \"dev\"; }).outPath" )
# Try again, with 'git' available. This should work.
path5=$(nix eval --raw "(builtins.fetchGit { url = $repo; ref = \"dev\"; }).outPath")
[[ $path3 = $path5 ]]