mirror of
https://github.com/NixOS/nix.git
synced 2024-11-22 14:52:55 +00:00
d4dcffd643
In this mode, the following restrictions apply:
* The builtins currentTime, currentSystem and storePath throw an
error.
* $NIX_PATH and -I are ignored.
* fetchGit and fetchMercurial require a revision hash.
* fetchurl and fetchTarball require a sha256 attribute.
* No file system access is allowed outside of the paths returned by
fetch{Git,Mercurial,url,Tarball}. Thus 'nix build -f ./foo.nix' is
not allowed.
Thus, the evaluation result is completely reproducible from the
command line arguments. E.g.
nix build --pure-eval '(
let
nix = fetchGit { url = https://github.com/NixOS/nixpkgs.git; rev = "9c927de4b179a6dd210dd88d34bda8af4b575680"; };
nixpkgs = fetchGit { url = https://github.com/NixOS/nixpkgs.git; ref = "release-17.09"; rev = "66b4de79e3841530e6d9c6baf98702aa1f7124e4"; };
in (import (nix + "/release.nix") { inherit nix nixpkgs; }).build.x86_64-linux
)'
The goal is to enable completely reproducible and traceable
evaluation. For example, a NixOS configuration could be fully
described by a single Git commit hash. 'nixos-rebuild' would do
something like
nix build --pure-eval '(
(import (fetchGit { url = file:///my-nixos-config; rev = "..."; })).system
')
where the Git repository /my-nixos-config would use further fetchGit
calls or Git externals to fetch Nixpkgs and whatever other
dependencies it has. Either way, the commit hash would uniquely
identify the NixOS configuration and allow it to reproduced.
142 lines
4.7 KiB
Bash
142 lines
4.7 KiB
Bash
source common.sh
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if [[ -z $(type -p git) ]]; then
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echo "Git not installed; skipping Git tests"
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exit 99
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fi
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clearStore
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repo=$TEST_ROOT/git
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rm -rf $repo ${repo}-tmp $TEST_HOME/.cache/nix/git
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git init $repo
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git -C $repo config user.email "foobar@example.com"
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git -C $repo config user.name "Foobar"
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echo utrecht > $repo/hello
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touch $repo/.gitignore
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git -C $repo add hello .gitignore
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git -C $repo commit -m 'Bla1'
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rev1=$(git -C $repo rev-parse HEAD)
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echo world > $repo/hello
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git -C $repo commit -m 'Bla2' -a
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rev2=$(git -C $repo rev-parse HEAD)
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# Fetch the default branch.
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path=$(nix eval --raw "(builtins.fetchGit file://$repo).outPath")
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[[ $(cat $path/hello) = world ]]
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# In pure eval mode, fetchGit without a revision should fail.
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[[ $(nix eval --raw "(builtins.readFile (fetchGit file://$repo + \"/hello\"))") = world ]]
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(! nix eval --pure-eval --raw "(builtins.readFile (fetchGit file://$repo + \"/hello\"))")
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# Fetch using an explicit revision hash.
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path2=$(nix eval --raw "(builtins.fetchGit { url = file://$repo; rev = \"$rev2\"; }).outPath")
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[[ $path = $path2 ]]
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# In pure eval mode, fetchGit with a revision should succeed.
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[[ $(nix eval --pure-eval --raw "(builtins.readFile (fetchGit { url = file://$repo; rev = \"$rev2\"; } + \"/hello\"))") = world ]]
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# Fetch again. This should be cached.
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mv $repo ${repo}-tmp
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path2=$(nix eval --raw "(builtins.fetchGit file://$repo).outPath")
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[[ $path = $path2 ]]
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[[ $(nix eval "(builtins.fetchGit file://$repo).revCount") = 2 ]]
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[[ $(nix eval --raw "(builtins.fetchGit file://$repo).rev") = $rev2 ]]
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# But with TTL 0, it should fail.
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(! nix eval --tarball-ttl 0 "(builtins.fetchGit file://$repo)" -vvvvv)
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# Fetching with a explicit hash should succeed.
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path2=$(nix eval --tarball-ttl 0 --raw "(builtins.fetchGit { url = file://$repo; rev = \"$rev2\"; }).outPath")
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[[ $path = $path2 ]]
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path2=$(nix eval --tarball-ttl 0 --raw "(builtins.fetchGit { url = file://$repo; rev = \"$rev1\"; }).outPath")
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[[ $(cat $path2/hello) = utrecht ]]
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mv ${repo}-tmp $repo
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# Using a clean working tree should produce the same result.
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path2=$(nix eval --raw "(builtins.fetchGit $repo).outPath")
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[[ $path = $path2 ]]
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# Using an unclean tree should yield the tracked but uncommitted changes.
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mkdir $repo/dir1 $repo/dir2
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echo foo > $repo/dir1/foo
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echo bar > $repo/bar
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echo bar > $repo/dir2/bar
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git -C $repo add dir1/foo
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git -C $repo rm hello
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path2=$(nix eval --raw "(builtins.fetchGit $repo).outPath")
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[ ! -e $path2/hello ]
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[ ! -e $path2/bar ]
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[ ! -e $path2/dir2/bar ]
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[ ! -e $path2/.git ]
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[[ $(cat $path2/dir1/foo) = foo ]]
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[[ $(nix eval --raw "(builtins.fetchGit $repo).rev") = 0000000000000000000000000000000000000000 ]]
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# ... unless we're using an explicit ref or rev.
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path3=$(nix eval --raw "(builtins.fetchGit { url = $repo; ref = \"master\"; }).outPath")
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[[ $path = $path3 ]]
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path3=$(nix eval --raw "(builtins.fetchGit { url = $repo; rev = \"$rev2\"; }).outPath")
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[[ $path = $path3 ]]
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# Committing should not affect the store path.
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git -C $repo commit -m 'Bla3' -a
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path4=$(nix eval --tarball-ttl 0 --raw "(builtins.fetchGit file://$repo).outPath")
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[[ $path2 = $path4 ]]
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# tarball-ttl should be ignored if we specify a rev
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echo delft > $repo/hello
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git -C $repo add hello
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git -C $repo commit -m 'Bla4'
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rev3=$(git -C $repo rev-parse HEAD)
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nix eval --tarball-ttl 3600 "(builtins.fetchGit { url = $repo; rev = \"$rev3\"; })" >/dev/null
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# Update 'path' to reflect latest master
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path=$(nix eval --raw "(builtins.fetchGit file://$repo).outPath")
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# Check behavior when non-master branch is used
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git -C $repo checkout $rev2 -b dev
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echo dev > $repo/hello
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# File URI uses 'master' unless specified otherwise
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path2=$(nix eval --raw "(builtins.fetchGit file://$repo).outPath")
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[[ $path = $path2 ]]
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# Using local path with branch other than 'master' should work when clean or dirty
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path3=$(nix eval --raw "(builtins.fetchGit $repo).outPath")
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# (check dirty-tree handling was used)
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[[ $(nix eval --raw "(builtins.fetchGit $repo).rev") = 0000000000000000000000000000000000000000 ]]
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# Committing shouldn't change store path, or switch to using 'master'
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git -C $repo commit -m 'Bla5' -a
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path4=$(nix eval --raw "(builtins.fetchGit $repo).outPath")
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[[ $(cat $path4/hello) = dev ]]
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[[ $path3 = $path4 ]]
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# Confirm same as 'dev' branch
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path5=$(nix eval --raw "(builtins.fetchGit { url = $repo; ref = \"dev\"; }).outPath")
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[[ $path3 = $path5 ]]
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# Nuke the cache
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rm -rf $TEST_HOME/.cache/nix/git
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# Try again, but without 'git' on PATH
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NIX=$(command -v nix)
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# This should fail
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(! PATH= $NIX eval --raw "(builtins.fetchGit { url = $repo; ref = \"dev\"; }).outPath" )
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# Try again, with 'git' available. This should work.
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path5=$(nix eval --raw "(builtins.fetchGit { url = $repo; ref = \"dev\"; }).outPath")
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[[ $path3 = $path5 ]]
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