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fetchTree: Disallow combination of submodules and exportIgnore for now

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This commit is contained in:
Robert Hensing 2024-01-05 19:49:39 +01:00
parent 71d08af15b
commit 692e9197bc
3 changed files with 32 additions and 13 deletions
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8
src/libexpr/primops/fetchTree.cc
View file

@ -1,3 +1,4 @@
#include "libfetchers/attrs.hh"
#include "primops.hh"
#include "eval-inline.hh"
#include "eval-settings.hh"
@ -139,9 +140,7 @@ static void fetchTree(
state.symbols[attr.name], showType(*attr.value)));
}
if (params.isFetchGit && !attrs.contains("exportIgnore")) {
// Default value; user attrs are assigned later.
// FIXME: exportIgnore := !submodules
if (params.isFetchGit && !attrs.contains("exportIgnore") && (!attrs.contains("submodules") || !*fetchers::maybeGetBoolAttr(attrs, "submodules"))) {
attrs.emplace("exportIgnore", Explicit<bool>{true});
}
@ -162,8 +161,7 @@ static void fetchTree(
fetchers::Attrs attrs;
attrs.emplace("type", "git");
attrs.emplace("url", fixGitURL(url));
if (!attrs.contains("exportIgnore")) {
// FIXME: exportIgnore := !submodules
if (!attrs.contains("exportIgnore") && (!attrs.contains("submodules") || !*fetchers::maybeGetBoolAttr(attrs, "submodules"))) {
attrs.emplace("exportIgnore", Explicit<bool>{true});
}
input = fetchers::Input::fromAttrs(std::move(attrs));

11
src/libfetchers/git.cc
View file

@ -1,3 +1,4 @@
#include "error.hh"
#include "fetchers.hh"
#include "users.hh"
#include "cache.hh"
@ -739,6 +740,16 @@ struct GitInputScheme : InputScheme
auto repoInfo = getRepoInfo(input);
if (getExportIgnoreAttr(input)
&& getSubmodulesAttr(input)) {
/* In this situation, we don't have a git CLI behavior that we can copy.
`git archive` does not support submodules, so it is unclear whether
rules from the parent should affect the submodule or not.
When git may eventually implement this, we need Nix to match its
behavior. */
throw UnimplementedError("exportIgnore and submodules are not supported together yet");
}
auto [accessor, final] =
input.getRef() || input.getRev() || !repoInfo.isLocal
? getAccessorFromCommit(store, repoInfo, std::move(input))

26
tests/functional/fetchGitSubmodules.sh
View file

@ -124,12 +124,16 @@ git -C $rootRepo/sub config user.email "foobar@example.com"
git -C $rootRepo/sub config user.name "Foobar"
echo "/exclude-from-root export-ignore" >> $rootRepo/.gitattributes
# TBD possible semantics for submodules + exportIgnore
# echo "/sub/exclude-deep export-ignore" >> $rootRepo/.gitattributes
echo nope > $rootRepo/exclude-from-root
git -C $rootRepo add .gitattributes exclude-from-root
git -C $rootRepo commit -m "Add export-ignore"
echo "/exclude-from-sub export-ignore" >> $rootRepo/sub/.gitattributes
echo nope > $rootRepo/sub/exclude-from-sub
# TBD possible semantics for submodules + exportIgnore
# echo aye > $rootRepo/sub/exclude-from-root
git -C $rootRepo/sub add .gitattributes exclude-from-sub
git -C $rootRepo/sub commit -m "Add export-ignore (sub)"
@ -138,15 +142,21 @@ git -C $rootRepo commit -m "Update submodule"
git -C $rootRepo status
# exportIgnore can be used with submodules
pathWithExportIgnore=$(nix eval --impure --raw --expr "(builtins.fetchGit { url = file://$rootRepo; submodules = true; exportIgnore = true; }).outPath")
# find $pathWithExportIgnore
# git -C $rootRepo archive --format=tar HEAD | tar -t
# cp -a $rootRepo /tmp/rootRepo
# # TBD: not supported yet, because semantics are undecided and current implementation leaks rules from the root to submodules
# # exportIgnore can be used with submodules
# pathWithExportIgnore=$(nix eval --impure --raw --expr "(builtins.fetchGit { url = file://$rootRepo; submodules = true; exportIgnore = true; }).outPath")
# # find $pathWithExportIgnore
# # git -C $rootRepo archive --format=tar HEAD | tar -t
# # cp -a $rootRepo /tmp/rootRepo
# [[ -e $pathWithExportIgnore/sub/content ]]
# [[ ! -e $pathWithExportIgnore/exclude-from-root ]]
# [[ ! -e $pathWithExportIgnore/sub/exclude-from-sub ]]
# TBD possible semantics for submodules + exportIgnore
# # root .gitattribute has no power across submodule boundary
# [[ -e $pathWithExportIgnore/sub/exclude-from-root ]]
# [[ -e $pathWithExportIgnore/sub/exclude-deep ]]
[[ -e $pathWithExportIgnore/sub/content ]]
[[ ! -e $pathWithExportIgnore/exclude-from-root ]]
[[ ! -e $pathWithExportIgnore/sub/exclude-from-sub ]]
# exportIgnore can be explicitly disabled with submodules
pathWithoutExportIgnore=$(nix eval --impure --raw --expr "(builtins.fetchGit { url = file://$rootRepo; submodules = true; exportIgnore = false; }).outPath")