Support reading attributes from index

Depending on the operation, we need to consider gitattributes
in both the work dir and the index.  This adds a parameter to
all of the gitattributes related functions that allows user
control of attribute reading behavior (i.e. prefer workdir,
prefer index, only use index).

This fix also covers allowing us to check attributes (and
hence do diff and status) on bare repositories.

This was a somewhat larger change that I hoped because it had
to change the cache key used for gitattributes files.

AUTHORS

@@ -43,6 +43,7 @@ Ramsay Jones
 Robert G. Jakabosky
 Romain Geissler
 Romain Muller
+Russell Belfer
 Sakari Jokinen
 Sam
 Sarath Lakshman

include/git2/attr.h

@@ -19,42 +19,186 @@
  */
 GIT_BEGIN_DECL
 
+/**
+ * GIT_ATTR_TRUE checks if an attribute is set on.  In core git
+ * parlance, this the value for "Set" attributes.
+ *
+ * For example, if the attribute file contains:
+ *
+ *    *.c foo
+ *
+ * Then for file `xyz.c` looking up attribute "foo" gives a value for
+ * which `GIT_ATTR_TRUE(value)` is true.
+ */
 #define GIT_ATTR_TRUE(attr)		((attr) == git_attr__true)
+
+/**
+ * GIT_ATTR_FALSE checks if an attribute is set off.  In core git
+ * parlance, this is the value for attributes that are "Unset" (not to
+ * be confused with values that a "Unspecified").
+ *
+ * For example, if the attribute file contains:
+ *
+ *    *.h -foo
+ *
+ * Then for file `zyx.h` looking up attribute "foo" gives a value for
+ * which `GIT_ATTR_FALSE(value)` is true.
+ */
 #define GIT_ATTR_FALSE(attr)	((attr) == git_attr__false)
-#define GIT_ATTR_UNSPECIFIED(attr)	((attr) == NULL)
+
+/**
+ * GIT_ATTR_UNSPECIFIED checks if an attribute is unspecified.  This
+ * may be due to the attribute not being mentioned at all or because
+ * the attribute was explicitly set unspecified via the `!` operator.
+ *
+ * For example, if the attribute file contains:
+ *
+ *    *.c foo
+ *    *.h -foo
+ *    onefile.c !foo
+ *
+ * Then for `onefile.c` looking up attribute "foo" yields a value with
+ * `GIT_ATTR_UNSPECIFIED(value)` of true.  Also, looking up "foo" on
+ * file `onefile.rb` or looking up "bar" on any file will all give
+ * `GIT_ATTR_UNSPECIFIED(value)` of true.
+ */
+#define GIT_ATTR_UNSPECIFIED(attr)	(!(attr) || (attr) == git_attr__unset)
+
+/**
+ * GIT_ATTR_SET_TO_VALUE checks if an attribute is set to a value (as
+ * opposied to TRUE, FALSE or UNSPECIFIED).  This would be the case if
+ * for a file with something like:
+ *
+ *    *.txt eol=lf
+ *
+ * Given this, looking up "eol" for `onefile.txt` will give back the
+ * string "lf" and `GIT_ATTR_SET_TO_VALUE(attr)` will return true.
+ */
+#define GIT_ATTR_SET_TO_VALUE(attr) \
+	((attr) && (attr) != git_attr__unset && \
+	 (attr) != git_attr__true && (attr) != git_attr__false)
 
 GIT_EXTERN(const char *) git_attr__true;
 GIT_EXTERN(const char *) git_attr__false;
+GIT_EXTERN(const char *) git_attr__unset;
 
+/**
+ * Check attribute flags: Reading values from index and working directory.
+ *
+ * When checking attributes, it is possible to check attribute files
+ * in both the working directory (if there is one) and the index (if
+ * there is one).  You can explicitly choose where to check and in
+ * which order using the following flags.
+ *
+ * Core git usually checks the working directory then the index,
+ * except during a checkout when it checks the index first.  It will
+ * use index only for creating archives or for a bare repo (if an
+ * index has been specified for the bare repo).
+ */
+#define GIT_ATTR_CHECK_FILE_THEN_INDEX	0
+#define GIT_ATTR_CHECK_INDEX_THEN_FILE	1
+#define GIT_ATTR_CHECK_INDEX_ONLY		2
 
 /**
- * Lookup attribute for path returning string caller must free
+ * Check attribute flags: Using the system attributes file.
+ *
+ * Normally, attribute checks include looking in the /etc (or system
+ * equivalent) directory for a `gitattributes` file.  Passing this
+ * flag will cause attribute checks to ignore that file.
+ */
+#define GIT_ATTR_CHECK_NO_SYSTEM		(1 << 2)
+
+/**
+ * Look up the value of one git attribute for path.
+ *
+ * @param repo The repository containing the path.
+ * @param flags A combination of GIT_ATTR_CHECK... flags.
+ * @param path The path to check for attributes.  Relative paths are
+ *             interpreted relative to the repo root.  The file does
+ *             not have to exist, but if it does not, then it will be
+ *             treated as a plain file (not a directory).
+ * @param name The name of the attribute to look up.
+ * @param value Output of the value of the attribute.  Use the GIT_ATTR_...
+ *             macros to test for TRUE, FALSE, UNSPECIFIED, etc. or just
+ *             use the string value for attributes set to a value.  You
+ *             should NOT modify or free this value.
  */
 GIT_EXTERN(int) git_attr_get(
-    git_repository *repo, const char *path, const char *name,
+    git_repository *repo,
+	uint32_t flags,
+	const char *path,
+	const char *name,
 	const char **value);
 
 /**
- * Lookup list of attributes for path, populating array of strings
+ * Look up a list of git attributes for path.
+ *
+ * Use this if you have a known list of attributes that you want to
+ * look up in a single call.  This is somewhat more efficient than
+ * calling `git_attr_get()` multiple times.
+ *
+ * For example, you might write:
+ *
+ *     const char *attrs[] = { "crlf", "diff", "foo" };
+ *     const char **values[3];
+ *     git_attr_get_many(repo, 0, "my/fun/file.c", 3, attrs, values);
+ *
+ * Then you could loop through the 3 values to get the settings for
+ * the three attributes you asked about.
+ *
+ * @param repo The repository containing the path.
+ * @param flags A combination of GIT_ATTR_CHECK... flags.
+ * @param path The path inside the repo to check attributes.  This
+ *             does not have to exist, but if it does not, then
+ *             it will be treated as a plain file (i.e. not a directory).
+ * @param num_attr The number of attributes being looked up
+ * @param names An array of num_attr strings containing attribute names.
+ * @param values An array of num_attr entries that will have string
+ *             pointers written into it for the values of the attributes.
+ *             You should not modify or free the values that are written
+ *             into this array (although of course, you should free the
+ *             array itself if you allocated it).
  */
 GIT_EXTERN(int) git_attr_get_many(
-    git_repository *repo, const char *path,
-    size_t num_attr, const char **names,
+    git_repository *repo,
+	uint32_t flags,
+	const char *path,
+    size_t num_attr,
+	const char **names,
 	const char **values);
 
 /**
- * Perform an operation on each attribute of a path.
+ * Loop over all the git attributes for a path.
+ *
+ * @param repo The repository containing the path.
+ * @param flags A combination of GIT_ATTR_CHECK... flags.
+ * @param path The path inside the repo to check attributes.  This
+ *             does not have to exist, but if it does not, then
+ *             it will be treated as a plain file (i.e. not a directory).
+ * @param callback The function that will be invoked on each attribute
+ *             and attribute value.  The name parameter will be the name
+ *             of the attribute and the value will be the value it is
+ *             set to, including possibly NULL if the attribute is
+ *             explicitly set to UNSPECIFIED using the ! sign.  This
+ *             will be invoked only once per attribute name, even if
+ *             there are multiple rules for a given file.  The highest
+ *             priority rule will be used.
+ * @param payload Passed on as extra parameter to callback function.
  */
 GIT_EXTERN(int) git_attr_foreach(
-    git_repository *repo, const char *path,
+    git_repository *repo,
+	uint32_t flags,
+	const char *path,
 	int (*callback)(const char *name, const char *value, void *payload),
 	void *payload);
 
 /**
  * Flush the gitattributes cache.
  *
- * Call this if you have reason to believe that the attributes files
- * on disk no longer match the cached contents of memory.
+ * Call this if you have reason to believe that the attributes files on
+ * disk no longer match the cached contents of memory.  This will cause
+ * the attributes files to be reloaded the next time that an attribute
+ * access function is called.
  */
 GIT_EXTERN(void) git_attr_cache_flush(
 	git_repository *repo);
@@ -62,7 +206,7 @@ GIT_EXTERN(void) git_attr_cache_flush(
 /**
  * Add a macro definition.
  *
- * Macros will automatically be loaded from the top level .gitattributes
+ * Macros will automatically be loaded from the top level `.gitattributes`
  * file of the repository (plus the build-in "binary" macro).  This
  * function allows you to add others.  For example, to add the default
  * macro, you would call:

src/attr.h

@@ -22,6 +22,9 @@ typedef struct {
 	const char *cfg_excl_file; /* cached value of core.excludesfile */
 } git_attr_cache;
 
+typedef int (*git_attr_file_parser)(
+	git_repository *, const char *, git_attr_file *);
+
 extern int git_attr_cache__init(git_repository *repo);
 
 extern int git_attr_cache__insert_macro(
@@ -30,21 +33,24 @@ extern int git_attr_cache__insert_macro(
 extern git_attr_rule *git_attr_cache__lookup_macro(
 	git_repository *repo, const char *name);
 
-extern int git_attr_cache__lookup_or_create_file(
+extern int git_attr_cache__push_file(
 	git_repository *repo,
-	const char *key,
+	const char *base,
 	const char *filename,
-	int (*loader)(git_repository *, const char *, git_attr_file *),
-	git_attr_file **file_ptr);
+	git_attr_file_source source,
+	git_attr_file_parser parse,
+	git_vector *stack);
 
-extern int git_attr_cache__push_file(
+extern int git_attr_cache__internal_file(
 	git_repository *repo,
-	git_vector     *stack,
-	const char     *base,
-	const char     *filename,
-	int (*loader)(git_repository *, const char *, git_attr_file *));
+	const char *key,
+	git_attr_file **file_ptr);
 
 /* returns true if path is in cache */
-extern bool git_attr_cache__is_cached(git_repository *repo, const char *path);
+extern bool git_attr_cache__is_cached(
+	git_repository *repo, git_attr_file_source source, const char *path);
+
+extern int git_attr_cache__decide_sources(
+	uint32_t flags, bool has_wd, bool has_index, git_attr_file_source *srcs);
 
 #endif

src/attr_file.c

 #include "common.h"
 #include "repository.h"
 #include "filebuf.h"
+#include "git2/blob.h"
+#include "git2/tree.h"
 #include <ctype.h>
 
 const char *git_attr__true  = "[internal]__TRUE__";
 const char *git_attr__false = "[internal]__FALSE__";
+const char *git_attr__unset = "[internal]__UNSET__";
 
 static int sort_by_hash_and_name(const void *a_raw, const void *b_raw);
 static void git_attr_rule__clear(git_attr_rule *rule);
 
-int git_attr_file__new(git_attr_file **attrs_ptr, git_pool *pool)
+int git_attr_file__new(
+	git_attr_file **attrs_ptr,
+	git_attr_file_source from,
+	const char *path,
+	git_pool *pool)
 {
 	git_attr_file *attrs = NULL;
 
@@ -25,6 +32,18 @@ int git_attr_file__new(git_attr_file **attrs_ptr, git_pool *pool)
 		attrs->pool_is_allocated = true;
 	}
 
+	if (path) {
+		size_t len = strlen(path);
+
+		attrs->key = git_pool_malloc(attrs->pool, len + 3);
+		GITERR_CHECK_ALLOC(attrs->key);
+
+		attrs->key[0] = '0' + from;
+		attrs->key[1] = '#';
+		memcpy(&attrs->key[2], path, len);
+		attrs->key[len + 2] = '\0';
+	}
+
 	if (git_vector_init(&attrs->rules, 4, NULL) < 0)
 		goto fail;
 
@@ -37,31 +56,7 @@ fail:
 	return -1;
 }
 
-int git_attr_file__set_path(
-	git_repository *repo, const char *path, git_attr_file *file)
-{
-	if (file->path != NULL) {
-		git__free(file->path);
-		file->path = NULL;
-	}
-
-	if (repo == NULL)
-		file->path = git__strdup(path);
-	else {
-		const char *workdir = git_repository_workdir(repo);
-
-		if (workdir && git__prefixcmp(path, workdir) == 0)
-			file->path = git__strdup(path + strlen(workdir));
-		else
-			file->path = git__strdup(path);
-	}
-
-	GITERR_CHECK_ALLOC(file->path);
-
-	return 0;
-}
-
-int git_attr_file__from_buffer(
+int git_attr_file__parse_buffer(
 	git_repository *repo, const char *buffer, git_attr_file *attrs)
 {
 	int error = 0;
@@ -73,10 +68,10 @@ int git_attr_file__from_buffer(
 
 	scan = buffer;
 
-	if (attrs->path && git__suffixcmp(attrs->path, GIT_ATTR_FILE) == 0) {
-		context = git__strndup(attrs->path,
-			strlen(attrs->path) - strlen(GIT_ATTR_FILE));
-		GITERR_CHECK_ALLOC(context);
+	/* if subdir file path, convert context for file paths */
+	if (attrs->key && git__suffixcmp(attrs->key, "/" GIT_ATTR_FILE) == 0) {
+		context = attrs->key + 2;
+		context[strlen(context) - strlen(GIT_ATTR_FILE)] = '\0';
 	}
 
 	while (!error && *scan) {
@@ -112,28 +107,34 @@ int git_attr_file__from_buffer(
 	}
 
 	git_attr_rule__free(rule);
-	git__free(context);
+
+	/* restore file path used for context */
+	if (context)
+		context[strlen(context)] = '.'; /* first char of GIT_ATTR_FILE */
 
 	return error;
 }
 
-int git_attr_file__from_file(
-	git_repository *repo, const char *path, git_attr_file *file)
+int git_attr_file__new_and_load(
+	git_attr_file **attrs_ptr,
+	const char *path)
 {
 	int error;
-	git_buf fbuf = GIT_BUF_INIT;
+	git_buf content = GIT_BUF_INIT;
 
-	assert(path && file);
+	if ((error = git_attr_file__new(attrs_ptr, 0, path, NULL)) < 0)
+		return error;
 
-	if (file->path == NULL && git_attr_file__set_path(repo, path, file) < 0)
-		return -1;
-
-	if (git_futils_readbuffer(&fbuf, path) < 0)
-		return -1;
+	if (!(error = git_futils_readbuffer(&content, path)))
+		error = git_attr_file__parse_buffer(
+			NULL, git_buf_cstr(&content), *attrs_ptr);
 
-	error = git_attr_file__from_buffer(repo, fbuf.ptr, file);
+	git_buf_free(&content);
 
-	git_buf_free(&fbuf);
+	if (error) {
+		git_attr_file__free(*attrs_ptr);
+		*attrs_ptr = NULL;
+	}
 
 	return error;
 }
@@ -151,9 +152,6 @@ void git_attr_file__free(git_attr_file *file)
 
 	git_vector_free(&file->rules);
 
-	git__free(file->path);
-	file->path = NULL;
-
 	if (file->pool_is_allocated) {
 		git_pool_clear(file->pool);
 		git__free(file->pool);
@@ -504,7 +502,7 @@ int git_attr_assignment__parse(
 			assign->value = git_attr__false;
 			scan++;
 		} else if (*scan == '!') {
-			assign->value = NULL; /* explicit unspecified state */
+			assign->value = git_attr__unset; /* explicit unspecified state */
 			scan++;
 		} else if (*scan == '#') /* comment rest of line */
 			break;

src/attr_file.h

@@ -48,7 +48,7 @@ typedef struct {
 } git_attr_assignment;
 
 typedef struct {
-	char *path;				/* cache the path this was loaded from */
+	char *key;				/* cache "source#path" this was loaded from */
 	git_vector rules;		/* vector of <rule*> or <fnmatch*> */
 	git_pool *pool;
 	bool pool_is_allocated;
@@ -61,20 +61,25 @@ typedef struct {
 	int         is_dir;
 } git_attr_path;
 
+typedef enum {
+	GIT_ATTR_FILE_FROM_FILE = 0,
+	GIT_ATTR_FILE_FROM_INDEX = 1
+} git_attr_file_source;
+
 /*
  * git_attr_file API
  */
 
-extern int git_attr_file__new(git_attr_file **attrs_ptr, git_pool *pool);
+extern int git_attr_file__new(
+	git_attr_file **attrs_ptr, git_attr_file_source src, const char *path, git_pool *pool);
+
+extern int git_attr_file__new_and_load(
+	git_attr_file **attrs_ptr, const char *path);
+
 extern void git_attr_file__free(git_attr_file *file);
 
-extern int git_attr_file__from_buffer(
+extern int git_attr_file__parse_buffer(
 	git_repository *repo, const char *buf, git_attr_file *file);
-extern int git_attr_file__from_file(
-	git_repository *repo, const char *path, git_attr_file *file);
-
-extern int git_attr_file__set_path(
-	git_repository *repo, const char *path, git_attr_file *file);
 
 extern int git_attr_file__lookup_one(
 	git_attr_file *file,

src/crlf.c

@@ -82,7 +82,8 @@ static int crlf_load_attributes(struct crlf_attrs *ca, git_repository *repo, con
 	const char *attr_vals[NUM_CONV_ATTRS];
 	int error;
 
-	error = git_attr_get_many(repo, path, NUM_CONV_ATTRS, attr_names, attr_vals);
+	error = git_attr_get_many(
+		repo, 0, path, NUM_CONV_ATTRS, attr_names, attr_vals);
 
 	if (error == GIT_ENOTFOUND) {
 		ca->crlf_action = GIT_CRLF_GUESS;

src/diff_output.c

@@ -103,7 +103,7 @@ static int diff_output_cb(void *priv, mmbuffer_t *bufs, int len)
 static int update_file_is_binary_by_attr(git_repository *repo, git_diff_file *file)
 {
 	const char *value;
-	if (git_attr_get(repo, file->path, "diff", &value) < 0)
+	if (git_attr_get(repo, 0, file->path, "diff", &value) < 0)
 		return -1;
 
 	if (GIT_ATTR_FALSE(value))

src/ignore.c

@@ -5,29 +5,22 @@
 #define GIT_IGNORE_FILE_INREPO	"info/exclude"
 #define GIT_IGNORE_FILE			".gitignore"
 
-static int load_ignore_file(
-	git_repository *repo, const char *path, git_attr_file *ignores)
+static int parse_ignore_file(
+	git_repository *repo, const char *buffer, git_attr_file *ignores)
 {
 	int error;
-	git_buf fbuf = GIT_BUF_INIT;
 	git_attr_fnmatch *match = NULL;
 	const char *scan = NULL;
 	char *context = NULL;
 
-	if (ignores->path == NULL) {
-		if (git_attr_file__set_path(repo, path, ignores) < 0)
-			return -1;
-	}
+	GIT_UNUSED(repo);
 
-	if (git__suffixcmp(ignores->path, GIT_IGNORE_FILE) == 0) {
-		context = git__strndup(ignores->path,
-			strlen(ignores->path) - strlen(GIT_IGNORE_FILE));
-		GITERR_CHECK_ALLOC(context);
+	if (ignores->key && git__suffixcmp(ignores->key, "/" GIT_IGNORE_FILE) == 0) {
+		context = ignores->key + 2;
+		context[strlen(context) - strlen(GIT_IGNORE_FILE)] = '\0';
 	}
 
-	error = git_futils_readbuffer(&fbuf, path);
-
-	scan = fbuf.ptr;
+	scan = buffer;
 
 	while (!error && *scan) {
 		if (!match) {
@@ -54,23 +47,27 @@ static int load_ignore_file(
 		}
 	}
 
-	git_buf_free(&fbuf);
 	git__free(match);
-	git__free(context);
+	/* restore file path used for context */
+	if (context)
+		context[strlen(context)] = '.'; /* first char of GIT_IGNORE_FILE */
 
 	return error;
 }
 
-#define push_ignore(R,S,B,F) \
-	git_attr_cache__push_file((R),(S),(B),(F),load_ignore_file)
+#define push_ignore_file(R,S,B,F) \
+	git_attr_cache__push_file((R),(B),(F),GIT_ATTR_FILE_FROM_FILE,parse_ignore_file,(S))
 
 static int push_one_ignore(void *ref, git_buf *path)
 {
 	git_ignores *ign = (git_ignores *)ref;
-	return push_ignore(ign->repo, &ign->ign_path, path->ptr, GIT_IGNORE_FILE);
+	return push_ignore_file(ign->repo, &ign->ign_path, path->ptr, GIT_IGNORE_FILE);
 }
 
-int git_ignore__for_path(git_repository *repo, const char *path, git_ignores *ignores)
+int git_ignore__for_path(
+	git_repository *repo,
+	const char *path,
+	git_ignores *ignores)
 {
 	int error = 0;
 	const char *workdir = git_repository_workdir(repo);
@@ -86,30 +83,37 @@ int git_ignore__for_path(git_repository *repo, const char *path, git_ignores *ig
 		(error = git_attr_cache__init(repo)) < 0)
 		goto cleanup;
 
-	/* translate path into directory within workdir */
-	if ((error = git_path_find_dir(&ignores->dir, path, workdir)) < 0)
+	/* given a unrooted path in a non-bare repo, resolve it */
+	if (workdir && git_path_root(path) < 0)
+		error = git_path_find_dir(&ignores->dir, path, workdir);
+	else
+		error = git_buf_sets(&ignores->dir, path);
+	if (error < 0)
 		goto cleanup;
 
 	/* set up internals */
-	error = git_attr_cache__lookup_or_create_file(
-		repo, GIT_IGNORE_INTERNAL, NULL, NULL, &ignores->ign_internal);
+	error = git_attr_cache__internal_file(
+		repo, GIT_IGNORE_INTERNAL, &ignores->ign_internal);
 	if (error < 0)
 		goto cleanup;
 
 	/* load .gitignore up the path */
-	error = git_path_walk_up(&ignores->dir, workdir, push_one_ignore, ignores);
-	if (error < 0)
-		goto cleanup;
+	if (workdir != NULL) {
+		error = git_path_walk_up(
+			&ignores->dir, workdir, push_one_ignore, ignores);
+		if (error < 0)
+			goto cleanup;
+	}
 
 	/* load .git/info/exclude */
-	error = push_ignore(repo, &ignores->ign_global,
+	error = push_ignore_file(repo, &ignores->ign_global,
 		git_repository_path(repo), GIT_IGNORE_FILE_INREPO);
 	if (error < 0)
 		goto cleanup;
 
 	/* load core.excludesfile */
 	if (git_repository_attr_cache(repo)->cfg_excl_file != NULL)
-		error = push_ignore(repo, &ignores->ign_global, NULL,
+		error = push_ignore_file(repo, &ignores->ign_global, NULL,
 			git_repository_attr_cache(repo)->cfg_excl_file);
 
 cleanup:
@@ -124,7 +128,7 @@ int git_ignore__push_dir(git_ignores *ign, const char *dir)
 	if (git_buf_joinpath(&ign->dir, ign->dir.ptr, dir) < 0)
 		return -1;
 	else
-		return push_ignore(
+		return push_ignore_file(
 			ign->repo, &ign->ign_path, ign->dir.ptr, GIT_IGNORE_FILE);
 }
 
@@ -132,7 +136,7 @@ int git_ignore__pop_dir(git_ignores *ign)
 {
 	if (ign->ign_path.length > 0) {
 		git_attr_file *file = git_vector_last(&ign->ign_path);
-		if (git__suffixcmp(ign->dir.ptr, file->path) == 0)
+		if (git__suffixcmp(ign->dir.ptr, file->key + 2) == 0)
 			git_vector_pop(&ign->ign_path);
 		git_buf_rtruncate_at_char(&ign->dir, '/');
 	}
@@ -163,7 +167,8 @@ static bool ignore_lookup_in_rules(
 	return false;
 }
 
-int git_ignore__lookup(git_ignores *ignores, const char *pathname, int *ignored)
+int git_ignore__lookup(
+	git_ignores *ignores, const char *pathname, int *ignored)
 {
 	unsigned int i;
 	git_attr_file *file;

src/ignore.h

@@ -25,13 +25,14 @@ typedef struct {
 	git_vector ign_global;
 } git_ignores;
 
-extern int git_ignore__for_path(
-	git_repository *repo, const char *path, git_ignores *ign);
+extern int git_ignore__for_path(git_repository *repo, const char *path, git_ignores *ign);
 
 extern int git_ignore__push_dir(git_ignores *ign, const char *dir);
+
 extern int git_ignore__pop_dir(git_ignores *ign);
 
 extern void git_ignore__free(git_ignores *ign);
+
 extern int git_ignore__lookup(git_ignores *ign, const char *path, int *ignored);
 
 #endif

src/object.c

@@ -292,3 +292,42 @@ size_t git_object__size(git_otype type)
 	return git_objects_table[type].size;
 }
 
+int git_object__resolve_to_type(git_object **obj, git_otype type)
+{
+	int error = 0;
+	git_object *scan, *next;
+
+	if (type == GIT_OBJ_ANY)
+		return 0;
+
+	scan = *obj;
+
+	while (!error && scan && git_object_type(scan) != type) {
+
+		switch (git_object_type(scan)) {
+		case GIT_OBJ_COMMIT:
+		{
+			git_tree *tree = NULL;
+			error = git_commit_tree(&tree, (git_commit *)scan);
+			next = (git_object *)tree;
+			break;
+		}
+
+		case GIT_OBJ_TAG:
+			error = git_tag_target(&next, (git_tag *)scan);
+			break;
+
+		default:
+			giterr_set(GITERR_REFERENCE, "Object does not resolve to type");
+			error = -1;
+			next = NULL;
+			break;
+		}
+
+		git_object_free(scan);
+		scan = next;
+	}
+
+	*obj = scan;
+	return error;
+}

src/repository.c

@@ -862,3 +862,23 @@ int git_repository_is_bare(git_repository *repo)
 	assert(repo);
 	return repo->is_bare;
 }
+
+int git_repository_head_tree(git_tree **tree, git_repository *repo)
+{
+	git_oid head_oid;
+	git_object *obj = NULL;
+
+	if (git_reference_name_to_oid(&head_oid, repo, GIT_HEAD_FILE) < 0) {
+		/* cannot resolve HEAD - probably brand new repo */
+		giterr_clear();
+		*tree = NULL;
+		return 0;
+	}
+
+	if (git_object_lookup(&obj, repo, &head_oid, GIT_OBJ_ANY) < 0 ||
+		git_object__resolve_to_type(&obj, GIT_OBJ_TREE) < 0)
+		return -1;
+
+	*tree = (git_tree *)obj;
+	return 0;
+}

src/repository.h

@@ -98,6 +98,8 @@ struct git_repository {
  * export */
 void git_object__free(void *object);
 
+int git_object__resolve_to_type(git_object **obj, git_otype type);
+
 int git_oid__parse(git_oid *oid, const char **buffer_out, const char *buffer_end, const char *header);
 void git_oid__writebuf(git_buf *buf, const char *header, const git_oid *oid);
 
@@ -106,6 +108,8 @@ GIT_INLINE(git_attr_cache *) git_repository_attr_cache(git_repository *repo)
 	return &repo->attrcache;
 }
 
+int git_repository_head_tree(git_tree **tree, git_repository *repo);
+
 /*
  * Weak pointers to repository internals.
  *

src/status.c

@@ -18,41 +18,6 @@
 #include "git2/diff.h"
 #include "diff.h"
 
-static int resolve_head_to_tree(git_tree **tree, git_repository *repo)
-{
-	git_oid head_oid;
-	git_object *obj = NULL;
-
-	if (git_reference_name_to_oid(&head_oid, repo, GIT_HEAD_FILE) < 0) {
-		/* cannot resolve HEAD - probably brand new repo */
-		giterr_clear();
-		*tree = NULL;
-		return 0;
-	}
-
-	if (git_object_lookup(&obj, repo, &head_oid, GIT_OBJ_ANY) < 0)
-		goto fail;
-
-	switch (git_object_type(obj)) {
-	case GIT_OBJ_TREE:
-		*tree = (git_tree *)obj;
-		break;
-	case GIT_OBJ_COMMIT:
-		if (git_commit_tree(tree, (git_commit *)obj) < 0)
-			goto fail;
-		git_object_free(obj);
-		break;
-	default:
-		goto fail;
-	}
-
-	return 0;
-
-fail:
-	git_object_free(obj);
-	return -1;
-}
-
 static unsigned int index_delta2status(git_delta_t index_status)
 {
 	unsigned int st = GIT_STATUS_CURRENT;
@@ -120,11 +85,8 @@ int git_status_foreach_ext(
 
 	assert(show <= GIT_STATUS_SHOW_INDEX_THEN_WORKDIR);
 
-	switch (resolve_head_to_tree(&head, repo)) {
-	case 0: break;
-	case GIT_ENOTFOUND: return 0;
-	default: return -1;
-	}
+	if ((err = git_repository_head_tree(&head, repo)) < 0)
+		return err;
 
 	memset(&diffopt, 0, sizeof(diffopt));
 	memcpy(&diffopt.pathspec, &opts->pathspec, sizeof(diffopt.pathspec));
@@ -405,7 +367,7 @@ int git_status_file(
 	status_entry_update_from_index(e, index);
 
 	/* Try to find file in HEAD */
-	if ((error = resolve_head_to_tree(&tree, repo)) < 0)
+	if ((error = git_repository_head_tree(&tree, repo)) < 0)
 		goto cleanup;
 
 	if (tree != NULL) {

tests-clar/attr/file.c

@@ -11,9 +11,9 @@ void test_attr_file__simple_read(void)
 	git_attr_assignment *assign;
 	git_attr_rule *rule;
 
-	cl_git_pass(git_attr_file__new(&file, NULL));
-	cl_git_pass(git_attr_file__from_file(NULL, cl_fixture("attr/attr0"), file));
-	cl_assert_equal_s(cl_fixture("attr/attr0"), file->path);
+	cl_git_pass(git_attr_file__new_and_load(&file, cl_fixture("attr/attr0")));
+
+	cl_assert_equal_s(cl_fixture("attr/attr0"), file->key + 2);
 	cl_assert(file->rules.length == 1);
 
 	rule = get_rule(0);
@@ -37,9 +37,9 @@ void test_attr_file__match_variants(void)
 	git_attr_rule *rule;
 	git_attr_assignment *assign;
 
-	cl_git_pass(git_attr_file__new(&file, NULL));
-	cl_git_pass(git_attr_file__from_file(NULL, cl_fixture("attr/attr1"), file));
-	cl_assert_equal_s(cl_fixture("attr/attr1"), file->path);
+	cl_git_pass(git_attr_file__new_and_load(&file, cl_fixture("attr/attr1")));
+
+	cl_assert_equal_s(cl_fixture("attr/attr1"), file->key + 2);
 	cl_assert(file->rules.length == 10);
 
 	/* let's do a thorough check of this rule, then just verify
@@ -123,9 +123,9 @@ void test_attr_file__assign_variants(void)
 	git_attr_rule *rule;
 	git_attr_assignment *assign;
 
-	cl_git_pass(git_attr_file__new(&file, NULL));
-	cl_git_pass(git_attr_file__from_file(NULL, cl_fixture("attr/attr2"), file));
-	cl_assert_equal_s(cl_fixture("attr/attr2"), file->path);
+	cl_git_pass(git_attr_file__new_and_load(&file, cl_fixture("attr/attr2")));
+
+	cl_assert_equal_s(cl_fixture("attr/attr2"), file->key + 2);
 	cl_assert(file->rules.length == 11);
 
 	check_one_assign(file, 0, 0, "pat0", "simple", EXPECT_TRUE, NULL);
@@ -189,9 +189,8 @@ void test_attr_file__check_attr_examples(void)
 	git_attr_rule *rule;
 	git_attr_assignment *assign;
 
-	cl_git_pass(git_attr_file__new(&file, NULL));
-	cl_git_pass(git_attr_file__from_file(NULL, cl_fixture("attr/attr3"), file));
-	cl_assert_equal_s(cl_fixture("attr/attr3"), file->path);
+	cl_git_pass(git_attr_file__new_and_load(&file, cl_fixture("attr/attr3")));
+	cl_assert_equal_s(cl_fixture("attr/attr3"), file->key + 2);
 	cl_assert(file->rules.length == 3);
 
 	rule = get_rule(0);
@@ -214,7 +213,7 @@ void test_attr_file__check_attr_examples(void)
 	cl_assert(rule->assigns.length == 1);
 	assign = get_assign(rule, 0);
 	cl_assert_equal_s("myAttr", assign->name);
-	cl_assert(assign->value == NULL);
+	cl_assert(GIT_ATTR_UNSPECIFIED(assign->value));
 
 	rule = get_rule(2);
 	cl_assert_equal_s("README", rule->match.pattern);

tests-clar/attr/flags.c

+#include "clar_libgit2.h"
+#include "git2/attr.h"
+
+void test_attr_flags__cleanup(void)
+{
+	cl_git_sandbox_cleanup();
+}
+
+void test_attr_flags__bare(void)
+{
+	git_repository *repo = cl_git_sandbox_init("testrepo.git");
+	const char *value;
+
+	cl_assert(git_repository_is_bare(repo));
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM, "README.md", "diff", &value));
+	cl_assert(GIT_ATTR_UNSPECIFIED(value));
+}
+
+void test_attr_flags__index_vs_workdir(void)
+{
+	git_repository *repo = cl_git_sandbox_init("attr_index");
+	const char *value;
+
+	cl_assert(!git_repository_is_bare(repo));
+
+	/* wd then index */
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_FILE_THEN_INDEX,
+		"README.md", "bar", &value));
+	cl_assert(GIT_ATTR_FALSE(value));
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_FILE_THEN_INDEX,
+		"README.md", "blargh", &value));
+	cl_assert_equal_s(value, "goop");
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_FILE_THEN_INDEX,
+		"README.txt", "foo", &value));
+	cl_assert(GIT_ATTR_FALSE(value));
+
+	/* index then wd */
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_INDEX_THEN_FILE,
+		"README.md", "bar", &value));
+	cl_assert(GIT_ATTR_TRUE(value));
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_INDEX_THEN_FILE,
+		"README.md", "blargh", &value));
+	cl_assert_equal_s(value, "garble");
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_INDEX_THEN_FILE,
+		"README.txt", "foo", &value));
+	cl_assert(GIT_ATTR_TRUE(value));
+}
+
+void test_attr_flags__subdir(void)
+{
+	git_repository *repo = cl_git_sandbox_init("attr_index");
+	const char *value;
+
+	/* wd then index */
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_FILE_THEN_INDEX,
+		"sub/sub/README.md", "bar", &value));
+	cl_assert_equal_s(value, "1234");
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_FILE_THEN_INDEX,
+		"sub/sub/README.txt", "another", &value));
+	cl_assert_equal_s(value, "one");
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_FILE_THEN_INDEX,
+		"sub/sub/README.txt", "again", &value));
+	cl_assert(GIT_ATTR_TRUE(value));
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_FILE_THEN_INDEX,
+		"sub/sub/README.txt", "beep", &value));
+	cl_assert_equal_s(value, "10");
+
+	/* index then wd */
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_INDEX_THEN_FILE,
+		"sub/sub/README.md", "bar", &value));
+	cl_assert_equal_s(value, "1337");
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_INDEX_THEN_FILE,
+		"sub/sub/README.txt", "another", &value));
+	cl_assert_equal_s(value, "one");
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_INDEX_THEN_FILE,
+		"sub/sub/README.txt", "again", &value));
+	cl_assert(GIT_ATTR_TRUE(value));
+
+	cl_git_pass(git_attr_get(
+		repo, GIT_ATTR_CHECK_NO_SYSTEM | GIT_ATTR_CHECK_INDEX_THEN_FILE,
+		"sub/sub/README.txt", "beep", &value));
+	cl_assert_equal_s(value, "5");
+}
+

tests-clar/attr/lookup.c

@@ -9,9 +9,8 @@ void test_attr_lookup__simple(void)
 	git_attr_path path;
 	const char *value = NULL;
 
-	cl_git_pass(git_attr_file__new(&file, NULL));
-	cl_git_pass(git_attr_file__from_file(NULL, cl_fixture("attr/attr0"), file));
-	cl_assert_equal_s(cl_fixture("attr/attr0"), file->path);
+	cl_git_pass(git_attr_file__new_and_load(&file, cl_fixture("attr/attr0")));
+	cl_assert_equal_s(cl_fixture("attr/attr0"), file->key + 2);
 	cl_assert(file->rules.length == 1);
 
 	cl_git_pass(git_attr_path__init(&path, "test", NULL));
@@ -130,9 +129,8 @@ void test_attr_lookup__match_variants(void)
 		{ NULL, NULL, 0, NULL }
 	};
 
-	cl_git_pass(git_attr_file__new(&file, NULL));
-	cl_git_pass(git_attr_file__from_file(NULL, cl_fixture("attr/attr1"), file));
-	cl_assert_equal_s(cl_fixture("attr/attr1"), file->path);
+	cl_git_pass(git_attr_file__new_and_load(&file, cl_fixture("attr/attr1")));
+	cl_assert_equal_s(cl_fixture("attr/attr1"), file->key + 2);
 	cl_assert(file->rules.length == 10);
 
 	cl_git_pass(git_attr_path__init(&path, "/testing/for/pat0", NULL));
@@ -192,8 +190,7 @@ void test_attr_lookup__assign_variants(void)
 		{ NULL, NULL, 0, NULL }
 	};
 
-	cl_git_pass(git_attr_file__new(&file, NULL));
-	cl_git_pass(git_attr_file__from_file(NULL, cl_fixture("attr/attr2"), file));
+	cl_git_pass(git_attr_file__new_and_load(&file, cl_fixture("attr/attr2")));
 	cl_assert(file->rules.length == 11);
 
 	run_test_cases(file, cases, 0);
@@ -228,8 +225,7 @@ void test_attr_lookup__check_attr_examples(void)
 		{ NULL, NULL, 0, NULL }
 	};
 
-	cl_git_pass(git_attr_file__new(&file, NULL));
-	cl_git_pass(git_attr_file__from_file(NULL, cl_fixture("attr/attr3"), file));
+	cl_git_pass(git_attr_file__new_and_load(&file, cl_fixture("attr/attr3")));
 	cl_assert(file->rules.length == 3);
 
 	run_test_cases(file, cases, 0);
@@ -254,8 +250,10 @@ void test_attr_lookup__from_buffer(void)
 		{ NULL, NULL, 0, NULL }
 	};
 
-	cl_git_pass(git_attr_file__new(&file, NULL));
-	cl_git_pass(git_attr_file__from_buffer(NULL, "a* foo\nabc bar\n* baz", file));
+	cl_git_pass(git_attr_file__new(&file, 0, NULL, NULL));
+
+	cl_git_pass(git_attr_file__parse_buffer(NULL, "a* foo\nabc bar\n* baz", file));
+
 	cl_assert(file->rules.length == 3);
 
 	run_test_cases(file, cases, 0);

tests-clar/attr/repo.c

@@ -64,13 +64,13 @@ void test_attr_repo__get_one(void)
 
 	for (scan = test_cases; scan->path != NULL; scan++) {
 		const char *value;
-		cl_git_pass(git_attr_get(g_repo, scan->path, scan->attr, &value));
+		cl_git_pass(git_attr_get(g_repo, 0, scan->path, scan->attr, &value));
 		attr_check_expected(scan->expected, scan->expected_str, value);
 	}
 
-	cl_assert(git_attr_cache__is_cached(g_repo, ".git/info/attributes"));
-	cl_assert(git_attr_cache__is_cached(g_repo, ".gitattributes"));
-	cl_assert(git_attr_cache__is_cached(g_repo, "sub/.gitattributes"));
+	cl_assert(git_attr_cache__is_cached(g_repo, 0, ".git/info/attributes"));
+	cl_assert(git_attr_cache__is_cached(g_repo, 0, ".gitattributes"));
+	cl_assert(git_attr_cache__is_cached(g_repo, 0, "sub/.gitattributes"));
 }
 
 void test_attr_repo__get_many(void)
@@ -78,21 +78,21 @@ void test_attr_repo__get_many(void)
 	const char *names[4] = { "repoattr", "rootattr", "missingattr", "subattr" };
 	const char *values[4];
 
-	cl_git_pass(git_attr_get_many(g_repo, "root_test1", 4, names, values));
+	cl_git_pass(git_attr_get_many(g_repo, 0, "root_test1", 4, names, values));
 
 	cl_assert(GIT_ATTR_TRUE(values[0]));
 	cl_assert(GIT_ATTR_TRUE(values[1]));
 	cl_assert(GIT_ATTR_UNSPECIFIED(values[2]));
 	cl_assert(GIT_ATTR_UNSPECIFIED(values[3]));
 
-	cl_git_pass(git_attr_get_many(g_repo, "root_test2", 4, names, values));
+	cl_git_pass(git_attr_get_many(g_repo, 0, "root_test2", 4, names, values));
 
 	cl_assert(GIT_ATTR_TRUE(values[0]));
 	cl_assert(GIT_ATTR_FALSE(values[1]));
 	cl_assert(GIT_ATTR_UNSPECIFIED(values[2]));
 	cl_assert(GIT_ATTR_UNSPECIFIED(values[3]));
 
-	cl_git_pass(git_attr_get_many(g_repo, "sub/subdir_test1", 4, names, values));
+	cl_git_pass(git_attr_get_many(g_repo, 0, "sub/subdir_test1", 4, names, values));
 
 	cl_assert(GIT_ATTR_TRUE(values[0]));
 	cl_assert(GIT_ATTR_TRUE(values[1]));
@@ -118,16 +118,17 @@ void test_attr_repo__foreach(void)
 	int count;
 
 	count = 0;
-	cl_git_pass(git_attr_foreach(g_repo, "root_test1", &count_attrs, &count));
+	cl_git_pass(git_attr_foreach(
+		g_repo, 0, "root_test1", &count_attrs, &count));
 	cl_assert(count == 2);
 
 	count = 0;
-	cl_git_pass(git_attr_foreach(g_repo, "sub/subdir_test1",
+	cl_git_pass(git_attr_foreach(g_repo, 0, "sub/subdir_test1",
 		&count_attrs, &count));
 	cl_assert(count == 4); /* repoattr, rootattr, subattr, negattr */
 
 	count = 0;
-	cl_git_pass(git_attr_foreach(g_repo, "sub/subdir_test2.txt",
+	cl_git_pass(git_attr_foreach(g_repo, 0, "sub/subdir_test2.txt",
 		&count_attrs, &count));
 	cl_assert(count == 6); /* repoattr, rootattr, subattr, reposub, negattr, another */
 }
@@ -136,19 +137,19 @@ void test_attr_repo__manpage_example(void)
 {
 	const char *value;
 
-	cl_git_pass(git_attr_get(g_repo, "sub/abc", "foo", &value));
+	cl_git_pass(git_attr_get(g_repo, 0, "sub/abc", "foo", &value));
 	cl_assert(GIT_ATTR_TRUE(value));
 
-	cl_git_pass(git_attr_get(g_repo, "sub/abc", "bar", &value));
+	cl_git_pass(git_attr_get(g_repo, 0, "sub/abc", "bar", &value));
 	cl_assert(GIT_ATTR_UNSPECIFIED(value));
 
-	cl_git_pass(git_attr_get(g_repo, "sub/abc", "baz", &value));
+	cl_git_pass(git_attr_get(g_repo, 0, "sub/abc", "baz", &value));
 	cl_assert(GIT_ATTR_FALSE(value));
 
-	cl_git_pass(git_attr_get(g_repo, "sub/abc", "merge", &value));
+	cl_git_pass(git_attr_get(g_repo, 0, "sub/abc", "merge", &value));
 	cl_assert_equal_s("filfre", value);
 
-	cl_git_pass(git_attr_get(g_repo, "sub/abc", "frotz", &value));
+	cl_git_pass(git_attr_get(g_repo, 0, "sub/abc", "frotz", &value));
 	cl_assert(GIT_ATTR_UNSPECIFIED(value));
 }
 
@@ -159,7 +160,7 @@ void test_attr_repo__macros(void)
 	const char *names3[3] = { "macro2", "multi2", "multi3" };
 	const char *values[5];
 
-	cl_git_pass(git_attr_get_many(g_repo, "binfile", 5, names, values));
+	cl_git_pass(git_attr_get_many(g_repo, 0, "binfile", 5, names, values));
 
 	cl_assert(GIT_ATTR_TRUE(values[0]));
 	cl_assert(GIT_ATTR_TRUE(values[1]));
@@ -167,7 +168,7 @@ void test_attr_repo__macros(void)
 	cl_assert(GIT_ATTR_FALSE(values[3]));
 	cl_assert(GIT_ATTR_UNSPECIFIED(values[4]));
 
-	cl_git_pass(git_attr_get_many(g_repo, "macro_test", 5, names2, values));
+	cl_git_pass(git_attr_get_many(g_repo, 0, "macro_test", 5, names2, values));
 
 	cl_assert(GIT_ATTR_TRUE(values[0]));
 	cl_assert(GIT_ATTR_TRUE(values[1]));
@@ -175,7 +176,7 @@ void test_attr_repo__macros(void)
 	cl_assert(GIT_ATTR_UNSPECIFIED(values[3]));
 	cl_assert_equal_s("77", values[4]);
 
-	cl_git_pass(git_attr_get_many(g_repo, "macro_test", 3, names3, values));
+	cl_git_pass(git_attr_get_many(g_repo, 0, "macro_test", 3, names3, values));
 
 	cl_assert(GIT_ATTR_TRUE(values[0]));
 	cl_assert(GIT_ATTR_FALSE(values[1]));
@@ -188,7 +189,7 @@ void test_attr_repo__bad_macros(void)
 		"firstmacro", "secondmacro", "thirdmacro" };
 	const char *values[6];
 
-	cl_git_pass(git_attr_get_many(g_repo, "macro_bad", 6, names, values));
+	cl_git_pass(git_attr_get_many(g_repo, 0, "macro_bad", 6, names, values));
 
 	/* these three just confirm that the "mymacro" rule ran */
 	cl_assert(GIT_ATTR_UNSPECIFIED(values[0]));

tests-clar/diff/tree.c

@@ -5,7 +5,6 @@ static git_repository *g_repo = NULL;
 
 void test_diff_tree__initialize(void)
 {
-	g_repo = cl_git_sandbox_init("attr");
 }
 
 void test_diff_tree__cleanup(void)
@@ -19,15 +18,16 @@ void test_diff_tree__0(void)
 	const char *a_commit = "605812a";
 	const char *b_commit = "370fe9ec22";
 	const char *c_commit = "f5b0af1fb4f5c";
-	git_tree *a = resolve_commit_oid_to_tree(g_repo, a_commit);
-	git_tree *b = resolve_commit_oid_to_tree(g_repo, b_commit);
-	git_tree *c = resolve_commit_oid_to_tree(g_repo, c_commit);
+	git_tree *a, *b, *c;
 	git_diff_options opts = {0};
 	git_diff_list *diff = NULL;
 	diff_expects exp;
 
-	cl_assert(a);
-	cl_assert(b);
+	g_repo = cl_git_sandbox_init("attr");
+
+	cl_assert((a = resolve_commit_oid_to_tree(g_repo, a_commit)) != NULL);
+	cl_assert((b = resolve_commit_oid_to_tree(g_repo, b_commit)) != NULL);
+	cl_assert((c = resolve_commit_oid_to_tree(g_repo, c_commit)) != NULL);
 
 	opts.context_lines = 1;
 	opts.interhunk_lines = 1;
@@ -87,12 +87,7 @@ void test_diff_tree__options(void)
 	const char *b_commit = "605812ab7fe421fdd";
 	const char *c_commit = "f5b0af1fb4f5";
 	const char *d_commit = "a97cc019851";
-
-	git_tree *a = resolve_commit_oid_to_tree(g_repo, a_commit);
-	git_tree *b = resolve_commit_oid_to_tree(g_repo, b_commit);
-	git_tree *c = resolve_commit_oid_to_tree(g_repo, c_commit);
-	git_tree *d = resolve_commit_oid_to_tree(g_repo, d_commit);
-
+	git_tree *a, *b, *c, *d;
 	git_diff_options opts = {0};
 	git_diff_list *diff = NULL;
 	diff_expects actual;
@@ -133,8 +128,12 @@ void test_diff_tree__options(void)
 	diff_expects *expected;
 	int i;
 
-	cl_assert(a);
-	cl_assert(b);
+	g_repo = cl_git_sandbox_init("attr");
+
+	cl_assert((a = resolve_commit_oid_to_tree(g_repo, a_commit)) != NULL);
+	cl_assert((b = resolve_commit_oid_to_tree(g_repo, b_commit)) != NULL);
+	cl_assert((c = resolve_commit_oid_to_tree(g_repo, c_commit)) != NULL);
+	cl_assert((d = resolve_commit_oid_to_tree(g_repo, d_commit)) != NULL);
 
 	for (i = 0; test_expects[i].files > 0; i++) {
 		memset(&actual, 0, sizeof(actual)); /* clear accumulator */
@@ -168,3 +167,42 @@ void test_diff_tree__options(void)
 	git_tree_free(c);
 	git_tree_free(d);
 }
+
+void test_diff_tree__bare(void)
+{
+	const char *a_commit = "8496071c1b46c85";
+	const char *b_commit = "be3563ae3f79";
+	git_tree *a, *b;
+	git_diff_options opts = {0};
+	git_diff_list *diff = NULL;
+	diff_expects exp;
+
+	g_repo = cl_git_sandbox_init("testrepo.git");
+
+	cl_assert((a = resolve_commit_oid_to_tree(g_repo, a_commit)) != NULL);
+	cl_assert((b = resolve_commit_oid_to_tree(g_repo, b_commit)) != NULL);
+
+	opts.context_lines = 1;
+	opts.interhunk_lines = 1;
+
+	memset(&exp, 0, sizeof(exp));
+
+	cl_git_pass(git_diff_tree_to_tree(g_repo, &opts, a, b, &diff));
+
+	cl_git_pass(git_diff_foreach(
+		diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
+
+	cl_assert(exp.files == 3);
+	cl_assert(exp.file_adds == 2);
+	cl_assert(exp.file_dels == 0);
+	cl_assert(exp.file_mods == 1);
+
+	cl_assert(exp.hunks == 3);
+
+	cl_assert(exp.lines == 4);
+	cl_assert(exp.line_ctxt == 0);
+	cl_assert(exp.line_adds == 3);
+	cl_assert(exp.line_dels == 1);
+
+	git_diff_list_free(diff);
+}

tests-clar/resources/attr_index/.gitted/HEAD

+ref: refs/heads/master

tests-clar/resources/attr_index/.gitted/config

+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = false
+	logallrefupdates = true
+	ignorecase = true

tests-clar/resources/attr_index/.gitted/description

+Unnamed repository; edit this file 'description' to name the repository.

tests-clar/resources/attr_index/.gitted/info/exclude

+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~

tests-clar/resources/attr_index/.gitted/info/refs

+58f7cf825b553ef7c26e5b9f8a23599c1a9ca296	refs/heads/master

tests-clar/resources/attr_index/.gitted/logs/HEAD

+0000000000000000000000000000000000000000 67c1640e91ccbaf0793591be09bf572cf40c9a53 Russell Belfer <rb@github.com> 1335817070 -0700	commit (initial): Initial commit
+67c1640e91ccbaf0793591be09bf572cf40c9a53 d441d7d88f52c28c2b23940ce4c33756748425f9 Russell Belfer <rb@github.com> 1335817296 -0700	commit: Adding some files in subtrees
+d441d7d88f52c28c2b23940ce4c33756748425f9 67c1640e91ccbaf0793591be09bf572cf40c9a53 Russell Belfer <rb@github.com> 1335817353 -0700	HEAD^: updating HEAD
+67c1640e91ccbaf0793591be09bf572cf40c9a53 58f7cf825b553ef7c26e5b9f8a23599c1a9ca296 Russell Belfer <rb@github.com> 1335817372 -0700	commit: Adding subtree data

tests-clar/resources/attr_index/.gitted/logs/refs/heads/master

+0000000000000000000000000000000000000000 67c1640e91ccbaf0793591be09bf572cf40c9a53 Russell Belfer <rb@github.com> 1335817070 -0700	commit (initial): Initial commit
+67c1640e91ccbaf0793591be09bf572cf40c9a53 d441d7d88f52c28c2b23940ce4c33756748425f9 Russell Belfer <rb@github.com> 1335817296 -0700	commit: Adding some files in subtrees
+d441d7d88f52c28c2b23940ce4c33756748425f9 67c1640e91ccbaf0793591be09bf572cf40c9a53 Russell Belfer <rb@github.com> 1335817353 -0700	HEAD^: updating HEAD
+67c1640e91ccbaf0793591be09bf572cf40c9a53 58f7cf825b553ef7c26e5b9f8a23599c1a9ca296 Russell Belfer <rb@github.com> 1335817372 -0700	commit: Adding subtree data

tests-clar/resources/attr_index/.gitted/objects/info/packs

+P pack-4e6438607204ce78827e3885594b2c0bb4f13895.pack
+

tests-clar/resources/attr_index/.gitted/packed-refs

+# pack-refs with: peeled 
+58f7cf825b553ef7c26e5b9f8a23599c1a9ca296 refs/heads/master

tests-clar/resources/attr_index/README.md

+This is contains tests for when the index and workdir differ

tests-clar/resources/attr_index/README.txt

+This contains files for testing when the index and the workdir differ

tests-clar/resources/attr_index/gitattributes

+* bar
+*.txt -foo beep=10
+*.md blargh=goop -bar
+

tests-clar/resources/attr_index/sub/sub/.gitattributes

+*.txt another=one again
+*.md bar=1234
+

tests-clar/resources/attr_index/sub/sub/README.md

+More testing

tests-clar/resources/attr_index/sub/sub/README.txt

+More testing

tests-clar/status/ignore.c

@@ -47,8 +47,8 @@ void test_status_ignore__0(void)
 	}
 
 	/* confirm that ignore files were cached */
-	cl_assert(git_attr_cache__is_cached(g_repo, ".git/info/exclude"));
-	cl_assert(git_attr_cache__is_cached(g_repo, ".gitignore"));
+	cl_assert(git_attr_cache__is_cached(g_repo, 0, ".git/info/exclude"));
+	cl_assert(git_attr_cache__is_cached(g_repo, 0, ".gitignore"));
 }