forked from lix-project/lix
Maximilian Bosch
0256e5578e
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/
532 lines
21 KiB
C++
532 lines
21 KiB
C++
#include "fetchers.hh"
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#include "cache.hh"
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#include "globals.hh"
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#include "tarfile.hh"
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#include "store-api.hh"
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#include "url-parts.hh"
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#include "pathlocks.hh"
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#include "fetch-settings.hh"
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#include <sys/time.h>
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#include <sys/wait.h>
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using namespace std::string_literals;
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namespace nix::fetchers {
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// Explicit initial branch of our bare repo to suppress warnings from new version of git.
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// The value itself does not matter, since we always fetch a specific revision or branch.
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// It is set with `-c init.defaultBranch=` instead of `--initial-branch=` to stay compatible with
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// old version of git, which will ignore unrecognized `-c` options.
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const std::string gitInitialBranch = "__nix_dummy_branch";
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static std::string readHead(const Path & path)
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{
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return chomp(runProgram("git", true, { "-C", path, "--git-dir", ".git", "rev-parse", "--abbrev-ref", "HEAD" }));
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}
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static bool isNotDotGitDirectory(const Path & path)
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{
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return baseNameOf(path) != ".git";
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}
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struct GitInputScheme : InputScheme
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{
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std::optional<Input> inputFromURL(const ParsedURL & url) override
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{
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if (url.scheme != "git" &&
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url.scheme != "git+http" &&
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url.scheme != "git+https" &&
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url.scheme != "git+ssh" &&
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url.scheme != "git+file") return {};
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auto url2(url);
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if (hasPrefix(url2.scheme, "git+")) url2.scheme = std::string(url2.scheme, 4);
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url2.query.clear();
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Attrs attrs;
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attrs.emplace("type", "git");
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for (auto &[name, value] : url.query) {
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if (name == "rev" || name == "ref")
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attrs.emplace(name, value);
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else if (name == "shallow" || name == "submodules")
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attrs.emplace(name, Explicit<bool> { value == "1" });
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else
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url2.query.emplace(name, value);
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}
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attrs.emplace("url", url2.to_string());
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return inputFromAttrs(attrs);
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}
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std::optional<Input> inputFromAttrs(const Attrs & attrs) override
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{
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if (maybeGetStrAttr(attrs, "type") != "git") return {};
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for (auto & [name, value] : attrs)
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if (name != "type" && name != "url" && name != "ref" && name != "rev" && name != "shallow" && name != "submodules" && name != "lastModified" && name != "revCount" && name != "narHash" && name != "allRefs" && name != "name")
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throw Error("unsupported Git input attribute '%s'", name);
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parseURL(getStrAttr(attrs, "url"));
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maybeGetBoolAttr(attrs, "shallow");
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maybeGetBoolAttr(attrs, "submodules");
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maybeGetBoolAttr(attrs, "allRefs");
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if (auto ref = maybeGetStrAttr(attrs, "ref")) {
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if (std::regex_search(*ref, badGitRefRegex))
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throw BadURL("invalid Git branch/tag name '%s'", *ref);
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}
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Input input;
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input.attrs = attrs;
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return input;
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}
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ParsedURL toURL(const Input & input) override
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{
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auto url = parseURL(getStrAttr(input.attrs, "url"));
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if (url.scheme != "git") url.scheme = "git+" + url.scheme;
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if (auto rev = input.getRev()) url.query.insert_or_assign("rev", rev->gitRev());
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if (auto ref = input.getRef()) url.query.insert_or_assign("ref", *ref);
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if (maybeGetBoolAttr(input.attrs, "shallow").value_or(false))
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url.query.insert_or_assign("shallow", "1");
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return url;
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}
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bool hasAllInfo(const Input & input) override
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{
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bool maybeDirty = !input.getRef();
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bool shallow = maybeGetBoolAttr(input.attrs, "shallow").value_or(false);
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return
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maybeGetIntAttr(input.attrs, "lastModified")
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&& (shallow || maybeDirty || maybeGetIntAttr(input.attrs, "revCount"));
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}
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Input applyOverrides(
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const Input & input,
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std::optional<std::string> ref,
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std::optional<Hash> rev) override
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{
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auto res(input);
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if (rev) res.attrs.insert_or_assign("rev", rev->gitRev());
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if (ref) res.attrs.insert_or_assign("ref", *ref);
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if (!res.getRef() && res.getRev())
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throw Error("Git input '%s' has a commit hash but no branch/tag name", res.to_string());
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return res;
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}
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void clone(const Input & input, const Path & destDir) override
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{
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auto [isLocal, actualUrl] = getActualUrl(input);
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Strings args = {"clone"};
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args.push_back(actualUrl);
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if (auto ref = input.getRef()) {
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args.push_back("--branch");
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args.push_back(*ref);
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}
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if (input.getRev()) throw UnimplementedError("cloning a specific revision is not implemented");
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args.push_back(destDir);
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runProgram("git", true, args);
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}
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std::optional<Path> getSourcePath(const Input & input) override
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{
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auto url = parseURL(getStrAttr(input.attrs, "url"));
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if (url.scheme == "file" && !input.getRef() && !input.getRev())
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return url.path;
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return {};
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}
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void markChangedFile(const Input & input, std::string_view file, std::optional<std::string> commitMsg) override
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{
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auto sourcePath = getSourcePath(input);
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assert(sourcePath);
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runProgram("git", true,
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{ "-C", *sourcePath, "--git-dir", ".git", "add", "--force", "--intent-to-add", "--", std::string(file) });
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if (commitMsg)
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runProgram("git", true,
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{ "-C", *sourcePath, "--git-dir", ".git", "commit", std::string(file), "-m", *commitMsg });
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}
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std::pair<bool, std::string> getActualUrl(const Input & input) const
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{
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// file:// URIs are normally not cloned (but otherwise treated the
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// same as remote URIs, i.e. we don't use the working tree or
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// HEAD). Exception: If _NIX_FORCE_HTTP is set, or the repo is a bare git
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// repo, treat as a remote URI to force a clone.
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static bool forceHttp = getEnv("_NIX_FORCE_HTTP") == "1"; // for testing
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auto url = parseURL(getStrAttr(input.attrs, "url"));
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bool isBareRepository = url.scheme == "file" && !pathExists(url.path + "/.git");
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bool isLocal = url.scheme == "file" && !forceHttp && !isBareRepository;
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return {isLocal, isLocal ? url.path : url.base};
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}
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std::pair<StorePath, Input> fetch(ref<Store> store, const Input & _input) override
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{
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Input input(_input);
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std::string name = input.getName();
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bool shallow = maybeGetBoolAttr(input.attrs, "shallow").value_or(false);
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bool submodules = maybeGetBoolAttr(input.attrs, "submodules").value_or(false);
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bool allRefs = maybeGetBoolAttr(input.attrs, "allRefs").value_or(false);
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std::string cacheType = "git";
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if (shallow) cacheType += "-shallow";
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if (submodules) cacheType += "-submodules";
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if (allRefs) cacheType += "-all-refs";
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auto checkHashType = [&](const std::optional<Hash> & hash)
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{
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if (hash.has_value() && !(hash->type == htSHA1 || hash->type == htSHA256))
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throw Error("Hash '%s' is not supported by Git. Supported types are sha1 and sha256.", hash->to_string(Base16, true));
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};
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auto getLockedAttrs = [&]()
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{
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checkHashType(input.getRev());
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return Attrs({
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{"type", cacheType},
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{"name", name},
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{"rev", input.getRev()->gitRev()},
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});
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};
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auto makeResult = [&](const Attrs & infoAttrs, StorePath && storePath)
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-> std::pair<StorePath, Input>
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{
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assert(input.getRev());
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assert(!_input.getRev() || _input.getRev() == input.getRev());
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if (!shallow)
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input.attrs.insert_or_assign("revCount", getIntAttr(infoAttrs, "revCount"));
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input.attrs.insert_or_assign("lastModified", getIntAttr(infoAttrs, "lastModified"));
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return {std::move(storePath), input};
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};
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if (input.getRev()) {
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if (auto res = getCache()->lookup(store, getLockedAttrs()))
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return makeResult(res->first, std::move(res->second));
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}
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auto [isLocal, actualUrl_] = getActualUrl(input);
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auto actualUrl = actualUrl_; // work around clang bug
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// If this is a local directory and no ref or revision is
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// given, then allow the use of an unclean working tree.
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if (!input.getRef() && !input.getRev() && isLocal) {
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bool clean = false;
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auto env = getEnv();
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// Set LC_ALL to C: because we rely on the error messages from git rev-parse to determine what went wrong
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// that way unknown errors can lead to a failure instead of continuing through the wrong code path
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env["LC_ALL"] = "C";
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/* Check whether HEAD points to something that looks like a commit,
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since that is the refrence we want to use later on. */
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auto result = runProgram(RunOptions {
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.program = "git",
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.args = { "-C", actualUrl, "--git-dir=.git", "rev-parse", "--verify", "--no-revs", "HEAD^{commit}" },
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.environment = env,
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.mergeStderrToStdout = true
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});
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auto exitCode = WEXITSTATUS(result.first);
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auto errorMessage = result.second;
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if (errorMessage.find("fatal: not a git repository") != std::string::npos) {
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throw Error("'%s' is not a Git repository", actualUrl);
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} else if (errorMessage.find("fatal: Needed a single revision") != std::string::npos) {
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// indicates that the repo does not have any commits
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// we want to proceed and will consider it dirty later
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} else if (exitCode != 0) {
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// any other errors should lead to a failure
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throw Error("getting the HEAD of the Git tree '%s' failed with exit code %d:\n%s", actualUrl, exitCode, errorMessage);
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}
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bool hasHead = exitCode == 0;
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try {
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if (hasHead) {
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// Using git diff is preferrable over lower-level operations here,
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// because its conceptually simpler and we only need the exit code anyways.
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auto gitDiffOpts = Strings({ "-C", actualUrl, "--git-dir", ".git", "diff", "HEAD", "--quiet"});
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if (!submodules) {
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// Changes in submodules should only make the tree dirty
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// when those submodules will be copied as well.
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gitDiffOpts.emplace_back("--ignore-submodules");
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}
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gitDiffOpts.emplace_back("--");
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runProgram("git", true, gitDiffOpts);
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clean = true;
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}
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} catch (ExecError & e) {
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if (!WIFEXITED(e.status) || WEXITSTATUS(e.status) != 1) throw;
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}
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if (!clean) {
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/* This is an unclean working tree. So copy all tracked files. */
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if (!fetchSettings.allowDirty)
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throw Error("Git tree '%s' is dirty", actualUrl);
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if (fetchSettings.warnDirty)
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warn("Git tree '%s' is dirty", actualUrl);
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auto gitOpts = Strings({ "-C", actualUrl, "--git-dir", ".git", "ls-files", "-z" });
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if (submodules)
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gitOpts.emplace_back("--recurse-submodules");
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auto files = tokenizeString<std::set<std::string>>(
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runProgram("git", true, gitOpts), "\0"s);
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Path actualPath(absPath(actualUrl));
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PathFilter filter = [&](const Path & p) -> bool {
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assert(hasPrefix(p, actualPath));
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std::string file(p, actualPath.size() + 1);
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auto st = lstat(p);
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if (S_ISDIR(st.st_mode)) {
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auto prefix = file + "/";
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auto i = files.lower_bound(prefix);
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return i != files.end() && hasPrefix(*i, prefix);
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}
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return files.count(file);
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};
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auto storePath = store->addToStore(input.getName(), actualPath, FileIngestionMethod::Recursive, htSHA256, filter);
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// FIXME: maybe we should use the timestamp of the last
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// modified dirty file?
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input.attrs.insert_or_assign(
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"lastModified",
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hasHead ? std::stoull(runProgram("git", true, { "-C", actualPath, "--git-dir", ".git", "log", "-1", "--format=%ct", "--no-show-signature", "HEAD" })) : 0);
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return {std::move(storePath), input};
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}
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}
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if (!input.getRef()) input.attrs.insert_or_assign("ref", isLocal ? readHead(actualUrl) : "master");
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Attrs unlockedAttrs({
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{"type", cacheType},
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{"name", name},
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{"url", actualUrl},
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{"ref", *input.getRef()},
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});
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Path repoDir;
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if (isLocal) {
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if (!input.getRev())
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input.attrs.insert_or_assign("rev",
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Hash::parseAny(chomp(runProgram("git", true, { "-C", actualUrl, "--git-dir", ".git", "rev-parse", *input.getRef() })), htSHA1).gitRev());
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repoDir = actualUrl;
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} else {
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if (auto res = getCache()->lookup(store, unlockedAttrs)) {
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auto rev2 = Hash::parseAny(getStrAttr(res->first, "rev"), htSHA1);
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if (!input.getRev() || input.getRev() == rev2) {
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input.attrs.insert_or_assign("rev", rev2.gitRev());
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return makeResult(res->first, std::move(res->second));
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}
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}
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Path cacheDir = getCacheDir() + "/nix/gitv3/" + hashString(htSHA256, actualUrl).to_string(Base32, false);
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repoDir = cacheDir;
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createDirs(dirOf(cacheDir));
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PathLocks cacheDirLock({cacheDir + ".lock"});
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if (!pathExists(cacheDir)) {
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runProgram("git", true, { "-c", "init.defaultBranch=" + gitInitialBranch, "init", "--bare", repoDir });
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}
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Path localRefFile =
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input.getRef()->compare(0, 5, "refs/") == 0
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? cacheDir + "/" + *input.getRef()
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: cacheDir + "/refs/heads/" + *input.getRef();
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bool doFetch;
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time_t now = time(0);
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/* If a rev was specified, we need to fetch if it's not in the
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repo. */
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if (input.getRev()) {
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try {
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runProgram("git", true, { "-C", repoDir, "cat-file", "-e", input.getRev()->gitRev() });
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doFetch = false;
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} catch (ExecError & e) {
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if (WIFEXITED(e.status)) {
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doFetch = true;
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} else {
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throw;
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}
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}
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} else {
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if (allRefs) {
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doFetch = true;
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} else {
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/* If the local ref is older than ‘tarball-ttl’ seconds, do a
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git fetch to update the local ref to the remote ref. */
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struct stat st;
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doFetch = stat(localRefFile.c_str(), &st) != 0 ||
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(uint64_t) st.st_mtime + settings.tarballTtl <= (uint64_t) now;
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}
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}
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if (doFetch) {
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Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Git repository '%s'", actualUrl));
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// FIXME: git stderr messes up our progress indicator, so
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// we're using --quiet for now. Should process its stderr.
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try {
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auto ref = input.getRef();
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auto fetchRef = allRefs
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? "refs/*"
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: ref->compare(0, 5, "refs/") == 0
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? *ref
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: ref == "HEAD"
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? *ref
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: "refs/heads/" + *ref;
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runProgram("git", true, { "-C", repoDir, "fetch", "--quiet", "--force", "--", actualUrl, fmt("%s:%s", fetchRef, fetchRef) });
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} catch (Error & e) {
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if (!pathExists(localRefFile)) throw;
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warn("could not update local clone of Git repository '%s'; continuing with the most recent version", actualUrl);
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}
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struct timeval times[2];
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times[0].tv_sec = now;
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times[0].tv_usec = 0;
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times[1].tv_sec = now;
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times[1].tv_usec = 0;
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utimes(localRefFile.c_str(), times);
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}
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if (!input.getRev())
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input.attrs.insert_or_assign("rev", Hash::parseAny(chomp(readFile(localRefFile)), htSHA1).gitRev());
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// cache dir lock is removed at scope end; we will only use read-only operations on specific revisions in the remainder
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}
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bool isShallow = chomp(runProgram("git", true, { "-C", repoDir, "rev-parse", "--is-shallow-repository" })) == "true";
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if (isShallow && !shallow)
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throw Error("'%s' is a shallow Git repository, but a non-shallow repository is needed", actualUrl);
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// FIXME: check whether rev is an ancestor of ref.
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printTalkative("using revision %s of repo '%s'", input.getRev()->gitRev(), actualUrl);
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/* Now that we know the ref, check again whether we have it in
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the store. */
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if (auto res = getCache()->lookup(store, getLockedAttrs()))
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return makeResult(res->first, std::move(res->second));
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Path tmpDir = createTempDir();
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||
AutoDelete delTmpDir(tmpDir, true);
|
||
PathFilter filter = defaultPathFilter;
|
||
|
||
auto result = runProgram(RunOptions {
|
||
.program = "git",
|
||
.args = { "-C", repoDir, "cat-file", "commit", input.getRev()->gitRev() },
|
||
.mergeStderrToStdout = true
|
||
});
|
||
if (WEXITSTATUS(result.first) == 128
|
||
&& result.second.find("bad file") != std::string::npos)
|
||
{
|
||
throw Error(
|
||
"Cannot find Git revision '%s' in ref '%s' of repository '%s'! "
|
||
"Please make sure that the " ANSI_BOLD "rev" ANSI_NORMAL " exists on the "
|
||
ANSI_BOLD "ref" ANSI_NORMAL " you've specified or add " ANSI_BOLD
|
||
"allRefs = true;" ANSI_NORMAL " to " ANSI_BOLD "fetchGit" ANSI_NORMAL ".",
|
||
input.getRev()->gitRev(),
|
||
*input.getRef(),
|
||
actualUrl
|
||
);
|
||
}
|
||
|
||
if (submodules) {
|
||
Path tmpGitDir = createTempDir();
|
||
AutoDelete delTmpGitDir(tmpGitDir, true);
|
||
|
||
runProgram("git", true, { "-c", "init.defaultBranch=" + gitInitialBranch, "init", tmpDir, "--separate-git-dir", tmpGitDir });
|
||
// TODO: repoDir might lack the ref (it only checks if rev
|
||
// exists, see FIXME above) so use a big hammer and fetch
|
||
// everything to ensure we get the rev.
|
||
runProgram("git", true, { "-C", tmpDir, "fetch", "--quiet", "--force",
|
||
"--update-head-ok", "--", repoDir, "refs/*:refs/*" });
|
||
|
||
runProgram("git", true, { "-C", tmpDir, "checkout", "--quiet", input.getRev()->gitRev() });
|
||
runProgram("git", true, { "-C", tmpDir, "remote", "add", "origin", actualUrl });
|
||
runProgram("git", true, { "-C", tmpDir, "submodule", "--quiet", "update", "--init", "--recursive" });
|
||
|
||
filter = isNotDotGitDirectory;
|
||
} else {
|
||
// FIXME: should pipe this, or find some better way to extract a
|
||
// revision.
|
||
auto source = sinkToSource([&](Sink & sink) {
|
||
runProgram2({
|
||
.program = "git",
|
||
.args = { "-C", repoDir, "archive", input.getRev()->gitRev() },
|
||
.standardOut = &sink
|
||
});
|
||
});
|
||
|
||
unpackTarfile(*source, tmpDir);
|
||
}
|
||
|
||
auto storePath = store->addToStore(name, tmpDir, FileIngestionMethod::Recursive, htSHA256, filter);
|
||
|
||
auto lastModified = std::stoull(runProgram("git", true, { "-C", repoDir, "log", "-1", "--format=%ct", "--no-show-signature", input.getRev()->gitRev() }));
|
||
|
||
Attrs infoAttrs({
|
||
{"rev", input.getRev()->gitRev()},
|
||
{"lastModified", lastModified},
|
||
});
|
||
|
||
if (!shallow)
|
||
infoAttrs.insert_or_assign("revCount",
|
||
std::stoull(runProgram("git", true, { "-C", repoDir, "rev-list", "--count", input.getRev()->gitRev() })));
|
||
|
||
if (!_input.getRev())
|
||
getCache()->add(
|
||
store,
|
||
unlockedAttrs,
|
||
infoAttrs,
|
||
storePath,
|
||
false);
|
||
|
||
getCache()->add(
|
||
store,
|
||
getLockedAttrs(),
|
||
infoAttrs,
|
||
storePath,
|
||
true);
|
||
|
||
return makeResult(infoAttrs, std::move(storePath));
|
||
}
|
||
};
|
||
|
||
static auto rGitInputScheme = OnStartup([] { registerInputScheme(std::make_unique<GitInputScheme>()); });
|
||
|
||
}
|