Merge pull request #1897 from piscisaureus/symlink-attr

Specify symlink type in .gitattributes
git-for-windows · May 19, 2019 · 6126a54 · 6126a54
2 parents 71e8bb7 + 0ab67ae
commit 6126a54
Show file tree

Hide file tree

Showing 2 changed files with 100 additions and 42 deletions.
diff --git a/compat/mingw.c b/compat/mingw.c
@@ -413,6 +413,54 @@ static void process_phantom_symlinks(void)
 	LeaveCriticalSection(&phantom_symlinks_cs);
 }
 
+static int create_phantom_symlink(wchar_t *wtarget, wchar_t *wlink)
+{
+	int len;
+
+	/* create file symlink */
+	if (!CreateSymbolicLinkW(wlink, wtarget, symlink_file_flags)) {
+		errno = err_win_to_posix(GetLastError());
+		return -1;
+	}
+
+	/* convert to directory symlink if target exists */
+	switch (process_phantom_symlink(wtarget, wlink)) {
+	case PHANTOM_SYMLINK_RETRY: {
+		/* if target doesn't exist, add to phantom symlinks list */
+		wchar_t wfullpath[MAX_LONG_PATH];
+		struct phantom_symlink_info *psi;
+
+		/* convert to absolute path to be independent of cwd */
+		len = GetFullPathNameW(wlink, MAX_LONG_PATH, wfullpath, NULL);
+		if (!len || len >= MAX_LONG_PATH) {
+			errno = err_win_to_posix(GetLastError());
+			return -1;
+		}
+
+		/* over-allocate and fill phantom_symlink_info structure */
+		psi = xmalloc(sizeof(struct phantom_symlink_info) +
+			      sizeof(wchar_t) * (len + wcslen(wtarget) + 2));
+		psi->wlink = (wchar_t *)(psi + 1);
+		wcscpy(psi->wlink, wfullpath);
+		psi->wtarget = psi->wlink + len + 1;
+		wcscpy(psi->wtarget, wtarget);
+
+		EnterCriticalSection(&phantom_symlinks_cs);
+		psi->next = phantom_symlinks;
+		phantom_symlinks = psi;
+		LeaveCriticalSection(&phantom_symlinks_cs);
+		break;
+	}
+	case PHANTOM_SYMLINK_DIRECTORY:
+		/* if we created a dir symlink, process other phantom symlinks */
+		process_phantom_symlinks();
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
 /* Normalizes NT paths as returned by some low-level APIs. */
 static wchar_t *normalize_ntpath(wchar_t *wbuf)
 {
@@ -2376,48 +2424,7 @@ int symlink(const char *target, const char *link)
 		if (wtarget[len] == '/')
 			wtarget[len] = '\\';
 
-	/* create file symlink */
-	if (!CreateSymbolicLinkW(wlink, wtarget, symlink_file_flags)) {
-		errno = err_win_to_posix(GetLastError());
-		return -1;
-	}
-
-	/* convert to directory symlink if target exists */
-	switch (process_phantom_symlink(wtarget, wlink)) {
-	case PHANTOM_SYMLINK_RETRY:	{
-		/* if target doesn't exist, add to phantom symlinks list */
-		wchar_t wfullpath[MAX_LONG_PATH];
-		struct phantom_symlink_info *psi;
-
-		/* convert to absolute path to be independent of cwd */
-		len = GetFullPathNameW(wlink, MAX_LONG_PATH, wfullpath, NULL);
-		if (!len || len >= MAX_LONG_PATH) {
-			errno = err_win_to_posix(GetLastError());
-			return -1;
-		}
-
-		/* over-allocate and fill phantom_symlink_info structure */
-		psi = xmalloc(sizeof(struct phantom_symlink_info)
-			+ sizeof(wchar_t) * (len + wcslen(wtarget) + 2));
-		psi->wlink = (wchar_t *)(psi + 1);
-		wcscpy(psi->wlink, wfullpath);
-		psi->wtarget = psi->wlink + len + 1;
-		wcscpy(psi->wtarget, wtarget);
-
-		EnterCriticalSection(&phantom_symlinks_cs);
-		psi->next = phantom_symlinks;
-		phantom_symlinks = psi;
-		LeaveCriticalSection(&phantom_symlinks_cs);
-		break;
-	}
-	case PHANTOM_SYMLINK_DIRECTORY:
-		/* if we created a dir symlink, process other phantom symlinks */
-		process_phantom_symlinks();
-		break;
-	default:
-		break;
-	}
-	return 0;
+	return create_phantom_symlink(wtarget, wlink);
 }
 
 #ifndef _WINNT_H

diff --git a/t/t2040-checkout-symlink-attr.sh b/t/t2040-checkout-symlink-attr.sh
@@ -0,0 +1,51 @@
+#!/bin/sh
+
+test_description='checkout symlinks with `symlink` attribute on Windows
+
+Ensures that Git for Windows creates symlinks of the right type,
+as specified by the `symlink` attribute in `.gitattributes`.'
+
+# Tell MSYS to create native symlinks. Without this flag test-lib's
+# prerequisite detection for SYMLINKS doesn't detect the right thing.
+MSYS=winsymlinks:nativestrict && export MSYS
+
+. ./test-lib.sh
+
+if ! test_have_prereq MINGW,SYMLINKS
+then
+	skip_all='skipping $0: MinGW-only test, which requires symlink support.'
+	test_done
+fi
+
+# Adds a symlink to the index without clobbering the work tree.
+cache_symlink () {
+	sha=$(printf '%s' "$1" | git hash-object --stdin -w) &&
+	git update-index --add --cacheinfo 120000,$sha,"$2"
+}
+
+# MSYS2 is very forgiving, it will resolve symlinks even if the
+# symlink type isn't correct. To make this test meaningful, try
+# them with a native, non-MSYS executable.
+cat_native () {
+	filename=$(cygpath -w "$1") &&
+	cmd.exe /c "type \"$filename\""
+}
+
+test_expect_success 'checkout symlinks with attr' '
+	cache_symlink file1 file-link &&
+	cache_symlink dir dir-link &&
+
+	printf "file-link symlink=file\ndir-link symlink=dir\n" >.gitattributes &&
+	git add .gitattributes &&
+
+	git checkout . &&
+
+	mkdir dir &&
+	echo "contents1" >file1 &&
+	echo "contents2" >dir/file2 &&
+
+	test "$(cat_native file-link)" = "contents1" &&
+	test "$(cat_native dir-link/file2)" = "contents2"
+'
+
+test_done