Re: [PATCH v2] test: set the realpath of CWD as TRASH_DIRECTORY

@@ -15,15 +15,26 @@ int is_directory(const char *path)
 #define MAXDEPTH 5
 
 /*
- * Use this to get the real path, i.e. resolve links. If you want an
- * absolute path but don't mind links, use absolute_path.
+ * Return the real path (i.e., absolute path, with symlinks resolved
+ * and extra slashes removed) equivalent to the specified path.  (If
+ * you want an absolute path but don't mind links, use
+ * absolute_path().)  The return value is a pointer to a static
+ * buffer.
+ *
+ * The input and all intermediate paths must be shorter than MAX_PATH.
+ * The directory part of path (i.e., everything up to the last
+ * dir_sep) must denote a valid, existing directory, but the last
+ * component need not exist.  If die_on_error is set, then die with an
+ * informative error message if there is a problem.  Otherwise, return
+ * NULL on errors (without generating any output).
  *
  * If path is our buffer, then return path, as it's already what the
  * user wants.
  */
-const char *real_path(const char *path)
+static const char *real_path_internal(const char *path, int die_on_error)
 {
 	static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
+	char *retval = NULL;
 	char cwd[1024] = "";
 	int buf_index = 1;
 

@@ -35,11 +46,19 @@ const char *real_path(const char *path)
 	if (path == buf || path == next_buf)
 		return path;
 
-	if (!*path)
-		die("The empty string is not a valid path");
+	if (!*path) {
+		if (die_on_error)
+			die("The empty string is not a valid path");
+		else
+			goto error_out;
+	}
 
-	if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
-		die ("Too long path: %.*s", 60, path);
+	if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) {
+		if (die_on_error)
+			die("Too long path: %.*s", 60, path);
+		else
+			goto error_out;
+	}
 
 	while (depth--) {
 		if (!is_directory(buf)) {

@@ -54,20 +73,36 @@ const char *real_path(const char *path)
 		}
 
 		if (*buf) {
-			if (!*cwd && !getcwd(cwd, sizeof(cwd)))
-				die_errno ("Could not get current working directory");
+			if (!*cwd && !getcwd(cwd, sizeof(cwd))) {
+				if (die_on_error)
+					die_errno("Could not get current working directory");
+				else
+					goto error_out;
+			}
 
-			if (chdir(buf))
-				die_errno ("Could not switch to '%s'", buf);
+			if (chdir(buf)) {
+				if (die_on_error)
+					die_errno("Could not switch to '%s'", buf);
+				else
+					goto error_out;
+			}
+		}
+		if (!getcwd(buf, PATH_MAX)) {
+			if (die_on_error)
+				die_errno("Could not get current working directory");
+			else
+				goto error_out;
 		}
-		if (!getcwd(buf, PATH_MAX))
-			die_errno ("Could not get current working directory");
 
 		if (last_elem) {
 			size_t len = strlen(buf);
-			if (len + strlen(last_elem) + 2 > PATH_MAX)
-				die ("Too long path name: '%s/%s'",
-						buf, last_elem);
+			if (len + strlen(last_elem) + 2 > PATH_MAX) {
+				if (die_on_error)
+					die("Too long path name: '%s/%s'",
+					    buf, last_elem);
+				else
+					goto error_out;
+			}
 			if (len && !is_dir_sep(buf[len-1]))
 				buf[len++] = '/';
 			strcpy(buf + len, last_elem);

@@ -77,10 +112,18 @@ const char *real_path(const char *path)
 
 		if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
 			ssize_t len = readlink(buf, next_buf, PATH_MAX);
-			if (len < 0)
-				die_errno ("Invalid symlink '%s'", buf);
-			if (PATH_MAX <= len)
-				die("symbolic link too long: %s", buf);
+			if (len < 0) {
+				if (die_on_error)
+					die_errno("Invalid symlink '%s'", buf);
+				else
+					goto error_out;
+			}
+			if (PATH_MAX <= len) {
+				if (die_on_error)
+					die("symbolic link too long: %s", buf);
+				else
+					goto error_out;
+			}
 			next_buf[len] = '\0';
 			buf = next_buf;
 			buf_index = 1 - buf_index;

@@ -89,10 +132,18 @@ const char *real_path(const char *path)
 			break;
 	}
 
+	retval = buf;
+error_out:
+	free(last_elem);
 	if (*cwd && chdir(cwd))
 		die_errno ("Could not change back to '%s'", cwd);
 
-	return buf;
+	return retval;
+}
+
+const char *real_path(const char *path)
+{
+	return real_path_internal(path, 1);
 }
 
 static const char *get_pwd_cwd(void)

@@ -146,6 +146,11 @@ const char *real_path(const char *path)
 	return real_path_internal(path, 1);
 }
 
+const char *real_path_if_valid(const char *path)
+{
+	return real_path_internal(path, 0);
+}
+
 static const char *get_pwd_cwd(void)
 {
 	static char cwd[PATH_MAX + 1];

@@ -714,6 +714,7 @@ static inline int is_absolute_path(const char *path)
 }
 int is_directory(const char *);
 const char *real_path(const char *path);
+const char *real_path_if_valid(const char *path);
 const char *absolute_path(const char *path);
 const char *relative_path(const char *abs, const char *base);
 int normalize_path_copy(char *dst, const char *src);

@@ -568,6 +568,25 @@ int normalize_path_copy(char *dst, const char *src)
 	return 0;
 }
 
+static int normalize_path_callback(struct string_list_item *item, void *cb_data)
+{
+	char buf[PATH_MAX+1];
+	const char *ceil = item->string;
+	int len = strlen(ceil);
+
+	if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
+		return 0;
+	memcpy(buf, ceil, len+1);
+	if (normalize_path_copy(buf, buf) < 0)
+		return 0;
+	len = strlen(buf);
+	if (len > 0 && buf[len-1] == '/')
+		buf[--len] = '\0';
+	free(item->string);
+	item->string = xstrdup(buf);
+	return 1;
+}
+
 /*
  * path = Canonical absolute path
  * prefix_list = Colon-separated list of absolute paths

@@ -584,28 +603,19 @@ int normalize_path_copy(char *dst, const char *src)
 int longest_ancestor_length(const char *path, const char *prefix_list)
 {
 	struct string_list prefixes = STRING_LIST_INIT_DUP;
-	char buf[PATH_MAX+1];
 	int i, max_len = -1;
 
 	if (prefix_list == NULL || !strcmp(path, "/"))
 		return -1;
 
 	string_list_split(&prefixes, prefix_list, PATH_SEP, -1);
+	filter_string_list(&prefixes, 0, normalize_path_callback, NULL);
 
 	for (i = 0; i < prefixes.nr; i++) {
 		const char *ceil = prefixes.items[i].string;
 		int len = strlen(ceil);
 
-		if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
-			continue;
-		memcpy(buf, ceil, len+1);
-		if (normalize_path_copy(buf, buf) < 0)
-			continue;
-		len = strlen(buf);
-		if (len > 0 && buf[len-1] == '/')
-			buf[--len] = '\0';
-
-		if (!strncmp(path, buf, len) &&
+		if (!strncmp(path, ceil, len) &&
 		    path[len] == '/' &&
 		    len > max_len) {
 			max_len = len;

@@ -12,6 +12,7 @@
  */
 #include "cache.h"
 #include "strbuf.h"
+#include "string-list.h"
 
 static char bad_path[] = "/bad-path/";
 

@@ -582,19 +583,22 @@ int normalize_path_copy(char *dst, const char *src)
  */
 int longest_ancestor_length(const char *path, const char *prefix_list)
 {
+	struct string_list prefixes = STRING_LIST_INIT_DUP;
 	char buf[PATH_MAX+1];
-	const char *ceil, *colon;
-	int len, max_len = -1;
+	int i, max_len = -1;
 
 	if (prefix_list == NULL || !strcmp(path, "/"))
 		return -1;
 
-	for (colon = ceil = prefix_list; *colon; ceil = colon+1) {
-		for (colon = ceil; *colon && *colon != PATH_SEP; colon++);
-		len = colon - ceil;
+	string_list_split(&prefixes, prefix_list, PATH_SEP, -1);
+
+	for (i = 0; i < prefixes.nr; i++) {
+		const char *ceil = prefixes.items[i].string;
+		int len = strlen(ceil);
+
 		if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
 			continue;
-		strlcpy(buf, ceil, len+1);
+		memcpy(buf, ceil, len+1);
 		if (normalize_path_copy(buf, buf) < 0)
 			continue;
 		len = strlen(buf);

@@ -608,6 +612,7 @@ int longest_ancestor_length(const char *path, const char *prefix_list)
 		}
 	}
 
+	string_list_clear(&prefixes, 0);
 	return max_len;
 }
 

@@ -570,7 +570,7 @@ int normalize_path_copy(char *dst, const char *src)
 
 static int normalize_path_callback(struct string_list_item *item, void *cb_data)
 {
-	char buf[PATH_MAX+1];
+	char buf[PATH_MAX+2];
 	const char *ceil = item->string;
 	int len = strlen(ceil);
 

@@ -580,8 +580,10 @@ static int normalize_path_callback(struct string_list_item *item, void *cb_data)
 	if (normalize_path_copy(buf, buf) < 0)
 		return 0;
 	len = strlen(buf);
-	if (len > 0 && buf[len-1] == '/')
-		buf[--len] = '\0';
+	if (len == 0 || buf[len-1] != '/') {
+		buf[len++] = '/';
+		buf[len++] = '\0';
+	}
 	free(item->string);
 	item->string = xstrdup(buf);
 	return 1;

@@ -616,9 +618,8 @@ int longest_ancestor_length(const char *path, const char *prefix_list)
 		int len = strlen(ceil);
 
 		if (!strncmp(path, ceil, len) &&
-		    path[len] == '/' &&
-		    len > max_len) {
-			max_len = len;
+		    len - 1 > max_len) {
+			max_len = len - 1;
 		}
 	}
 

@@ -570,22 +570,25 @@ int normalize_path_copy(char *dst, const char *src)
 
 static int normalize_path_callback(struct string_list_item *item, void *cb_data)
 {
-	char buf[PATH_MAX+2];
+	char *buf;
 	const char *ceil = item->string;
-	int len = strlen(ceil);
+	const char *realpath;
+	int len;
 
-	if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
+	if (!*ceil || !is_absolute_path(ceil))
 		return 0;
-	memcpy(buf, ceil, len+1);
-	if (normalize_path_copy(buf, buf) < 0)
+	realpath = real_path_if_valid(ceil);
+	if (!realpath)
 		return 0;
-	len = strlen(buf);
+	len = strlen(realpath);
+	buf = xmalloc(len + 2); /* Leave space for possible trailing slash */
+	strcpy(buf, realpath);
 	if (len == 0 || buf[len-1] != '/') {
 		buf[len++] = '/';
 		buf[len++] = '\0';
 	}
 	free(item->string);
-	item->string = xstrdup(buf);
+	item->string = buf;
 	return 1;
 }
 

@@ -12,28 +12,6 @@ norm_path() {
 	"test \"\$(test-path-utils normalize_path_copy '$1')\" = '$2'"
 }
 
-# On Windows, we are using MSYS's bash, which mangles the paths.
-# Absolute paths are anchored at the MSYS installation directory,
-# which means that the path / accounts for this many characters:
-rootoff=$(test-path-utils normalize_path_copy / | wc -c)
-# Account for the trailing LF:
-if test $rootoff = 2; then
-	rootoff=	# we are on Unix
-else
-	rootoff=$(($rootoff-1))
-fi
-
-ancestor() {
-	# We do some math with the expected ancestor length.
-	expected=$3
-	if test -n "$rootoff" && test "x$expected" != x-1; then
-		expected=$(($expected+$rootoff))
-	fi
-	test_expect_success "longest ancestor: $1 $2 => $expected" \
-	"actual=\$(test-path-utils longest_ancestor_length '$1' '$2') &&
-	 test \"\$actual\" = '$expected'"
-}
-
 # Absolute path tests must be skipped on Windows because due to path mangling
 # the test program never sees a POSIX-style absolute path
 case $(uname -s) in

@@ -93,48 +71,6 @@ norm_path /d1/s1//../s2/../../d2 /d2 POSIX
 norm_path /d1/.../d2 /d1/.../d2 POSIX
 norm_path /d1/..././../d2 /d1/d2 POSIX
 
-ancestor / "" -1
-ancestor / / -1
-ancestor /foo "" -1
-ancestor /foo : -1
-ancestor /foo ::. -1
-ancestor /foo ::..:: -1
-ancestor /foo / 0
-ancestor /foo /fo -1
-ancestor /foo /foo -1
-ancestor /foo /foo/ -1
-ancestor /foo /bar -1
-ancestor /foo /bar/ -1
-ancestor /foo /foo/bar -1
-ancestor /foo /foo:/bar/ -1
-ancestor /foo /foo/:/bar/ -1
-ancestor /foo /foo::/bar/ -1
-ancestor /foo /:/foo:/bar/ 0
-ancestor /foo /foo:/:/bar/ 0
-ancestor /foo /:/bar/:/foo 0
-ancestor /foo/bar "" -1
-ancestor /foo/bar / 0
-ancestor /foo/bar /fo -1
-ancestor /foo/bar foo -1
-ancestor /foo/bar /foo 4
-ancestor /foo/bar /foo/ 4
-ancestor /foo/bar /foo/ba -1
-ancestor /foo/bar /:/fo 0
-ancestor /foo/bar /foo:/foo/ba 4
-ancestor /foo/bar /bar -1
-ancestor /foo/bar /bar/ -1
-ancestor /foo/bar /fo: -1
-ancestor /foo/bar :/fo -1
-ancestor /foo/bar /foo:/bar/ 4
-ancestor /foo/bar /:/foo:/bar/ 4
-ancestor /foo/bar /foo:/:/bar/ 4
-ancestor /foo/bar /:/bar/:/fo 0
-ancestor /foo/bar /:/bar/ 0
-ancestor /foo/bar .:/foo/. 4
-ancestor /foo/bar .:/foo/.:.: 4
-ancestor /foo/bar /foo/./:.:/bar 4
-ancestor /foo/bar .:/bar -1
-
 test_expect_success 'strip_path_suffix' '
 	test c:/msysgit = $(test-path-utils strip_path_suffix \
 		c:/msysgit/libexec//git-core libexec/git-core)

@@ -605,23 +605,16 @@ static int normalize_path_callback(struct string_list_item *item, void *cb_data)
 int longest_ancestor_length(const char *path, const char *prefix_list)
 {
 	struct string_list prefixes = STRING_LIST_INIT_DUP;
-	int i, max_len = -1;
+	int max_len;
+	const char *longest_prefix;
 
 	if (prefix_list == NULL || !strcmp(path, "/"))
 		return -1;
 
 	string_list_split(&prefixes, prefix_list, PATH_SEP, -1);
 	filter_string_list(&prefixes, 0, normalize_path_callback, NULL);
-
-	for (i = 0; i < prefixes.nr; i++) {
-		const char *ceil = prefixes.items[i].string;
-		int len = strlen(ceil);
-
-		if (!strncmp(path, ceil, len) &&
-		    len - 1 > max_len) {
-			max_len = len - 1;
-		}
-	}
+	longest_prefix = string_list_longest_prefix(&prefixes, path);
+	max_len = longest_prefix ? strlen(longest_prefix) - 1 : -1;
 
 	string_list_clear(&prefixes, 0);
 	return max_len;

@@ -14,8 +14,7 @@ test_fail() {
 	'
 }
 
-TRASH_ROOT="$PWD"
-ROOT_PARENT=$(dirname "$TRASH_ROOT")
+ROOT_PARENT=$(dirname "$TRASH_DIRECTORY")
 
 
 unset GIT_CEILING_DIRECTORIES

@@ -32,16 +31,16 @@ test_prefix ceil_at_parent ""
 GIT_CEILING_DIRECTORIES="$ROOT_PARENT/"
 test_prefix ceil_at_parent_slash ""
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY"
 test_prefix ceil_at_trash ""
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/"
 test_prefix ceil_at_trash_slash ""
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sub"
 test_prefix ceil_at_sub ""
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sub/"
 test_prefix ceil_at_sub_slash ""
 
 

@@ -56,55 +55,55 @@ export GIT_CEILING_DIRECTORIES
 GIT_CEILING_DIRECTORIES=""
 test_prefix subdir_ceil_empty "sub/dir/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY"
 test_fail subdir_ceil_at_trash
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/"
 test_fail subdir_ceil_at_trash_slash
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sub"
 test_fail subdir_ceil_at_sub
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sub/"
 test_fail subdir_ceil_at_sub_slash
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/dir"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sub/dir"
 test_prefix subdir_ceil_at_subdir "sub/dir/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/dir/"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sub/dir/"
 test_prefix subdir_ceil_at_subdir_slash "sub/dir/"
 
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/su"
 test_prefix subdir_ceil_at_su "sub/dir/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su/"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/su/"
 test_prefix subdir_ceil_at_su_slash "sub/dir/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/di"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sub/di"
 test_prefix subdir_ceil_at_sub_di "sub/dir/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/di"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sub/di"
 test_prefix subdir_ceil_at_sub_di_slash "sub/dir/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/subdi"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/subdi"
 test_prefix subdir_ceil_at_subdi "sub/dir/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/subdi"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/subdi"
 test_prefix subdir_ceil_at_subdi_slash "sub/dir/"
 
 
-GIT_CEILING_DIRECTORIES="/foo:$TRASH_ROOT/sub"
+GIT_CEILING_DIRECTORIES="/foo:$TRASH_DIRECTORY/sub"
 test_fail second_of_two
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub:/bar"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sub:/bar"
 test_fail first_of_two
 
-GIT_CEILING_DIRECTORIES="/foo:$TRASH_ROOT/sub:/bar"
+GIT_CEILING_DIRECTORIES="/foo:$TRASH_DIRECTORY/sub:/bar"
 test_fail second_of_three
 
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sub"
 GIT_DIR=../../.git
 export GIT_DIR
 test_prefix git_dir_specified ""

@@ -123,41 +122,41 @@ export GIT_CEILING_DIRECTORIES
 GIT_CEILING_DIRECTORIES=""
 test_prefix sd_ceil_empty "s/d/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY"
 test_fail sd_ceil_at_trash
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/"
 test_fail sd_ceil_at_trash_slash
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/s"
 test_fail sd_ceil_at_s
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/s/"
 test_fail sd_ceil_at_s_slash
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/d"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/s/d"
 test_prefix sd_ceil_at_sd "s/d/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/d/"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/s/d/"
 test_prefix sd_ceil_at_sd_slash "s/d/"
 
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/su"
 test_prefix sd_ceil_at_su "s/d/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su/"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/su/"
 test_prefix sd_ceil_at_su_slash "s/d/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/di"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/s/di"
 test_prefix sd_ceil_at_s_di "s/d/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/di"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/s/di"
 test_prefix sd_ceil_at_s_di_slash "s/d/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sdi"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sdi"
 test_prefix sd_ceil_at_sdi "s/d/"
 
-GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sdi"
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/sdi"
 test_prefix sd_ceil_at_sdi_slash "s/d/"