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libfetchers/git: hardcode --git-dir

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To demonstrate the problem:

* You need a `git` at 2.33.3 in your $PATH
* An expression like this in a git repository:

  ``` nix
  {
    outputs = { self, nixpkgs }: {
      packages.foo.x86_64-linux = with nixpkgs.legacyPackages.x86_64-linux;
        runCommand "snens" { } ''
          echo ${(builtins.fetchGit ./.).lastModifiedDate} > $out
        '';
    };
  }
  ```

Now, when instantiating the package via `builtins.getFlake`, it fails on
Nix 2.7 like this:

    $ nix-instantiate -E '(builtins.getFlake "'"$(pwd)"'").packages.foo.x86_64-linux'
    fatal: unsafe repository ('/nix/store/a7j3125km4h8l0p71q6ssfkxamfh5d61-source' is owned by someone else)
    To add an exception for this directory, call:

    	git config --global --add safe.directory /nix/store/a7j3125km4h8l0p71q6ssfkxamfh5d61-source
    error: program 'git' failed with exit code 128
    (use '--show-trace' to show detailed location information)

This breaks e.g. `nixops`-deployments using flakes with similar
expressions as shown above.

The cause for this is that `git(1)` tries to find the highest
`.git`-directory in the directory tree and if it finds a such a
directory, but with another owning user (root vs. the user who evaluates
the expression), it fails as above. This was changed recently to fix
CVE-2022-24765[1].

By explicitly specifying `--git-dir`, Git assumes to be in the top-level
directory and doesn't attempt to look for a `.git`-directory in the
parent directories and thus the code-path leading to said error is never
reached.

[1] https://lore.kernel.org/git/xmqqv8veb5i6.fsf@gitster.g/
This commit is contained in:
Maximilian Bosch 2022-04-23 23:04:35 +02:00
parent 7f814d6d9a
commit 0256e5578e
No known key found for this signature in database
GPG key ID: 091DBF4D1FC46B8E
1 changed files with 7 additions and 7 deletions
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14
src/libfetchers/git.cc
View file

@ -23,7 +23,7 @@ const std::string gitInitialBranch = "__nix_dummy_branch";
static std::string readHead(const Path & path)
{
return chomp(runProgram("git", true, { "-C", path, "rev-parse", "--abbrev-ref", "HEAD" }));
return chomp(runProgram("git", true, { "-C", path, "--git-dir", ".git", "rev-parse", "--abbrev-ref", "HEAD" }));
}
static bool isNotDotGitDirectory(const Path & path)
@ -152,11 +152,11 @@ struct GitInputScheme : InputScheme
assert(sourcePath);
runProgram("git", true,
{ "-C", *sourcePath, "add", "--force", "--intent-to-add", "--", std::string(file) });
{ "-C", *sourcePath, "--git-dir", ".git", "add", "--force", "--intent-to-add", "--", std::string(file) });
if (commitMsg)
runProgram("git", true,
{ "-C", *sourcePath, "commit", std::string(file), "-m", *commitMsg });
{ "-C", *sourcePath, "--git-dir", ".git", "commit", std::string(file), "-m", *commitMsg });
}
std::pair<bool, std::string> getActualUrl(const Input & input) const
@ -259,7 +259,7 @@ struct GitInputScheme : InputScheme
if (hasHead) {
// Using git diff is preferrable over lower-level operations here,
// because its conceptually simpler and we only need the exit code anyways.
auto gitDiffOpts = Strings({ "-C", actualUrl, "diff", "HEAD", "--quiet"});
auto gitDiffOpts = Strings({ "-C", actualUrl, "--git-dir", ".git", "diff", "HEAD", "--quiet"});
if (!submodules) {
// Changes in submodules should only make the tree dirty
// when those submodules will be copied as well.
@ -284,7 +284,7 @@ struct GitInputScheme : InputScheme
if (fetchSettings.warnDirty)
warn("Git tree '%s' is dirty", actualUrl);
auto gitOpts = Strings({ "-C", actualUrl, "ls-files", "-z" });
auto gitOpts = Strings({ "-C", actualUrl, "--git-dir", ".git", "ls-files", "-z" });
if (submodules)
gitOpts.emplace_back("--recurse-submodules");
@ -314,7 +314,7 @@ struct GitInputScheme : InputScheme
// modified dirty file?
input.attrs.insert_or_assign(
"lastModified",
hasHead ? std::stoull(runProgram("git", true, { "-C", actualPath, "log", "-1", "--format=%ct", "--no-show-signature", "HEAD" })) : 0);
hasHead ? std::stoull(runProgram("git", true, { "-C", actualPath, "--git-dir", ".git", "log", "-1", "--format=%ct", "--no-show-signature", "HEAD" })) : 0);
return {std::move(storePath), input};
}
@ -335,7 +335,7 @@ struct GitInputScheme : InputScheme
if (!input.getRev())
input.attrs.insert_or_assign("rev",
Hash::parseAny(chomp(runProgram("git", true, { "-C", actualUrl, "rev-parse", *input.getRef() })), htSHA1).gitRev());
Hash::parseAny(chomp(runProgram("git", true, { "-C", actualUrl, "--git-dir", ".git", "rev-parse", *input.getRef() })), htSHA1).gitRev());
repoDir = actualUrl;