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Restore backwards-compat for current builtins.fetchGit

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If a repo is dirty, it used to return a `rev` object with an "empty"
sha1 (0000000000000000000000000000000000000000). Please note that this
only applies for `builtins.fetchGit` and *not* for `builtins.fetchTree{
type = "git"; }`.
This commit is contained in:
Maximilian Bosch 2020-07-28 22:46:39 +02:00
parent f742438465
commit e4940e90f3
No known key found for this signature in database
GPG key ID: 091DBF4D1FC46B8E
3 changed files with 17 additions and 6 deletions
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2
src/libexpr/flake/flake.hh
View file

@ -106,6 +106,6 @@ void emitTreeAttrs(
EvalState & state,
const fetchers::Tree & tree,
const fetchers::Input & input,
Value & v);
Value & v, bool emptyRevFallback = false);
}

17
src/libexpr/primops/fetchTree.cc
View file

@ -14,7 +14,8 @@ void emitTreeAttrs(
EvalState & state,
const fetchers::Tree & tree,
const fetchers::Input & input,
Value & v)
Value & v,
bool emptyRevFallback)
{
assert(input.isImmutable());
@ -34,6 +35,11 @@ void emitTreeAttrs(
if (auto rev = input.getRev()) {
mkString(*state.allocAttr(v, state.symbols.create("rev")), rev->gitRev());
mkString(*state.allocAttr(v, state.symbols.create("shortRev")), rev->gitShortRev());
} else if (emptyRevFallback) {
// Backwards compat for `builtins.fetchGit`: dirty repos return an empty sha1 as rev
auto emptyHash = Hash(htSHA1);
mkString(*state.allocAttr(v, state.symbols.create("rev")), emptyHash.gitRev());
mkString(*state.allocAttr(v, state.symbols.create("shortRev")), emptyHash.gitRev());
}
if (input.getType() == "git")
@ -41,6 +47,8 @@ void emitTreeAttrs(
if (auto revCount = input.getRevCount())
mkInt(*state.allocAttr(v, state.symbols.create("revCount")), *revCount);
else if (emptyRevFallback)
mkInt(*state.allocAttr(v, state.symbols.create("revCount")), 0);
if (auto lastModified = input.getLastModified()) {
mkInt(*state.allocAttr(v, state.symbols.create("lastModified")), *lastModified);
@ -68,7 +76,8 @@ static void fetchTree(
const Pos &pos,
Value **args,
Value &v,
const std::optional<std::string> type
const std::optional<std::string> type,
bool emptyRevFallback = false
) {
fetchers::Input input;
PathSet context;
@ -134,7 +143,7 @@ static void fetchTree(
if (state.allowedPaths)
state.allowedPaths->insert(tree.actualPath);
emitTreeAttrs(state, tree, input2, v);
emitTreeAttrs(state, tree, input2, v, emptyRevFallback);
}
static void prim_fetchTree(EvalState & state, const Pos & pos, Value * * args, Value & v)
@ -224,7 +233,7 @@ static void prim_fetchTarball(EvalState & state, const Pos & pos, Value * * args
static void prim_fetchGit(EvalState &state, const Pos &pos, Value **args, Value &v)
{
fetchTree(state, pos, args, v, "git");
fetchTree(state, pos, args, v, "git", true);
}
static RegisterPrimOp r2("__fetchurl", 1, prim_fetchurl);

4
tests/fetchGit.sh
View file

@ -89,6 +89,8 @@ path2=$(nix eval --impure --raw --expr "(builtins.fetchGit $repo).outPath")
[ ! -e $path2/.git ]
[[ $(cat $path2/dir1/foo) = foo ]]
[[ $(nix eval --impure --raw --expr "(builtins.fetchGit $repo).rev") = 0000000000000000000000000000000000000000 ]]
# ... unless we're using an explicit ref or rev.
path3=$(nix eval --impure --raw --expr "(builtins.fetchGit { url = $repo; ref = \"master\"; }).outPath")
[[ $path = $path3 ]]
@ -129,7 +131,7 @@ path2=$(nix eval --impure --raw --expr "(builtins.fetchGit file://$repo).outPath
# Using local path with branch other than 'master' should work when clean or dirty
path3=$(nix eval --impure --raw --expr "(builtins.fetchGit $repo).outPath")
# (check dirty-tree handling was used)
[[ $(nix eval --impure --expr "(builtins.fetchGit $repo).rev or null") = null ]]
[[ $(nix eval --impure --raw --expr "(builtins.fetchGit $repo).rev") = 0000000000000000000000000000000000000000 ]]
# Committing shouldn't change store path, or switch to using 'master'
git -C $repo commit -m 'Bla5' -a