git-lfs support

doc/manual/rl-next/git-lfs-support.md

@@ -0,0 +1,11 @@
+---
+synopsis: "Git LFS support"
+prs: [10153]
+---
+
+The Git fetcher now supports Large File Storage (LFS). This can be enabled by passing the attribute `lfs = true` to the fetcher, e.g.
+```console
+nix flake prefetch 'git+ssh://[email protected]/Apress/repo-with-large-file-storage.git?lfs=1'
+```
+
+Author: [**@b-camacho**](https://github.com/b-camacho), [**@kip93**](https://github.com/kip93)

src/libexpr/primops/fetchTree.cc

@@ -367,6 +367,12 @@ static RegisterPrimOp primop_fetchTree({
 
           Default: `false`
 
+        - `lfs` (Bool, optional)
+
+          Fetch any [Git LFS](https://git-lfs.com/) files.
+
+          Default: `false`
+
         - `allRefs` (Bool, optional)
 
           By default, this has no effect. This becomes relevant only once `shallow` cloning is disabled.
@@ -691,6 +697,13 @@ static RegisterPrimOp primop_fetchGit({
 
         Make a shallow clone when fetching the Git tree.
         When this is enabled, the options `ref` and `allRefs` have no effect anymore.
+
+      - `lfs` (default: `false`)
+
+        A boolean that when `true` specifies that [Git LFS] files should be fetched.
+
+        [Git LFS]: https://git-lfs.com/
+
       - `allRefs`
 
         Whether to fetch all references (eg. branches and tags) of the repository.

src/libfetchers-tests/git-utils.cc

@@ -7,6 +7,7 @@
 #include <gtest/gtest.h>
 #include "fs-sink.hh"
 #include "serialise.hh"
+#include "git-lfs-fetch.hh"
 
 namespace nix {
 
@@ -109,4 +110,131 @@ TEST_F(GitUtilsTest, sink_hardlink)
     }
 };
 
+namespace lfs {
+
+TEST_F(GitUtilsTest, parseGitRemoteUrl)
+{
+    {
+        GitUrl result = parseGitUrl("[email protected]:path/repo.git");
+        EXPECT_EQ(result.protocol, "ssh");
+        EXPECT_EQ(result.user, "git");
+        EXPECT_EQ(result.host, "example.com");
+        EXPECT_EQ(result.port, "");
+        EXPECT_EQ(result.path, "path/repo.git");
+    }
+
+    {
+        GitUrl result = parseGitUrl("example.com:/path/repo.git");
+        EXPECT_EQ(result.protocol, "ssh");
+        EXPECT_EQ(result.user, "");
+        EXPECT_EQ(result.host, "example.com");
+        EXPECT_EQ(result.port, "");
+        EXPECT_EQ(result.path, "/path/repo.git");
+    }
+
+    {
+        GitUrl result = parseGitUrl("example.com:path/repo.git");
+        EXPECT_EQ(result.protocol, "ssh");
+        EXPECT_EQ(result.user, "");
+        EXPECT_EQ(result.host, "example.com");
+        EXPECT_EQ(result.port, "");
+        EXPECT_EQ(result.path, "path/repo.git");
+    }
+
+    {
+        GitUrl result = parseGitUrl("https://example.com/path/repo.git");
+        EXPECT_EQ(result.protocol, "https");
+        EXPECT_EQ(result.user, "");
+        EXPECT_EQ(result.host, "example.com");
+        EXPECT_EQ(result.port, "");
+        EXPECT_EQ(result.path, "path/repo.git");
+    }
+
+    {
+        GitUrl result = parseGitUrl("ssh://[email protected]/path/repo.git");
+        EXPECT_EQ(result.protocol, "ssh");
+        EXPECT_EQ(result.user, "git");
+        EXPECT_EQ(result.host, "example.com");
+        EXPECT_EQ(result.port, "");
+        EXPECT_EQ(result.path, "path/repo.git");
+    }
+
+    {
+        GitUrl result = parseGitUrl("ssh://example/path/repo.git");
+        EXPECT_EQ(result.protocol, "ssh");
+        EXPECT_EQ(result.user, "");
+        EXPECT_EQ(result.host, "example");
+        EXPECT_EQ(result.port, "");
+        EXPECT_EQ(result.path, "path/repo.git");
+    }
+
+    {
+        GitUrl result = parseGitUrl("http://example.com:8080/path/repo.git");
+        EXPECT_EQ(result.protocol, "http");
+        EXPECT_EQ(result.user, "");
+        EXPECT_EQ(result.host, "example.com");
+        EXPECT_EQ(result.port, "8080");
+        EXPECT_EQ(result.path, "path/repo.git");
+    }
+
+    {
+        GitUrl result = parseGitUrl("invalid-url");
+        EXPECT_EQ(result.protocol, "");
+        EXPECT_EQ(result.user, "");
+        EXPECT_EQ(result.host, "");
+        EXPECT_EQ(result.port, "");
+        EXPECT_EQ(result.path, "");
+    }
+
+    {
+        GitUrl result = parseGitUrl("");
+        EXPECT_EQ(result.protocol, "");
+        EXPECT_EQ(result.user, "");
+        EXPECT_EQ(result.host, "");
+        EXPECT_EQ(result.port, "");
+        EXPECT_EQ(result.path, "");
+    }
+}
+TEST_F(GitUtilsTest, gitUrlToHttp)
+{
+    {
+        const GitUrl url = parseGitUrl("[email protected]:user/repo.git");
+        EXPECT_EQ(url.toHttp(), "https://github.com/user/repo.git");
+    }
+    {
+        const GitUrl url = parseGitUrl("https://github.com/user/repo.git");
+        EXPECT_EQ(url.toHttp(), "https://github.com/user/repo.git");
+    }
+    {
+        const GitUrl url = parseGitUrl("http://github.com/user/repo.git");
+        EXPECT_EQ(url.toHttp(), "http://github.com/user/repo.git");
+    }
+    {
+        const GitUrl url = parseGitUrl("ssh://[email protected]:22/user/repo.git");
+        EXPECT_EQ(url.toHttp(), "https://github.com:22/user/repo.git");
+    }
+    {
+        const GitUrl url = parseGitUrl("invalid-url");
+        EXPECT_EQ(url.toHttp(), "");
+    }
+}
+
+TEST_F(GitUtilsTest, gitUrlToSsh)
+{
+    {
+        const GitUrl url = parseGitUrl("https://example.com/user/repo.git");
+        const auto [host, path] = url.toSsh();
+        EXPECT_EQ(host, "example.com");
+        EXPECT_EQ(path, "user/repo.git");
+    }
+    {
+        const GitUrl url = parseGitUrl("[email protected]:user/repo.git");
+        const auto [host, path] = url.toSsh();
+        EXPECT_EQ(host, "[email protected]");
+        EXPECT_EQ(path, "user/repo.git");
+    }
+}
+
+} // namespace lfs
+
 } // namespace nix