X-Git-Url: http://git.scripts.mit.edu/?a=blobdiff_plain;f=path.c;h=4ef1b01e05bc1b32d337d13a1b654e4993ea0456;hb=c536c0755f6450b7bcce499cfda171f8c6d1e593;hp=d3d3f8b8ad75b9817df3014296aabc34b6a4eb14;hpb=8be1d04a7e9251380a5de80564284f0099774038;p=git.git

diff --git a/path.c b/path.c
index d3d3f8b8ad..4ef1b01e05 100644
--- a/path.c
+++ b/path.c
@@ -1,19 +1,19 @@
 /*
- * I'm tired of doing "vsnprintf()" etc just to open a
- * file, so here's a "return static buffer with printf"
- * interface for paths.
- *
- * It's obviously not thread-safe. Sue me. But it's quite
- * useful for doing things like
- *
- *   f = open(mkpath("%s/%s.git", base, name), O_RDONLY);
- *
- * which is what it's designed for.
+ * Utilities for paths and pathnames
  */
 #include "cache.h"
 #include "strbuf.h"
 #include "string-list.h"
 
+static int get_st_mode_bits(const char *path, int *mode)
+{
+	struct stat st;
+	if (lstat(path, &st) < 0)
+		return -1;
+	*mode = st.st_mode;
+	return 0;
+}
+
 static char bad_path[] = "/bad-path/";
 
 static char *get_pathname(void)
@@ -389,28 +389,14 @@ const char *enter_repo(const char *path, int strict)
 	return NULL;
 }
 
-int set_shared_perm(const char *path, int mode)
+static int calc_shared_perm(int mode)
 {
-	struct stat st;
-	int tweak, shared, orig_mode;
+	int tweak;
 
-	if (!shared_repository) {
-		if (mode)
-			return chmod(path, mode & ~S_IFMT);
-		return 0;
-	}
-	if (!mode) {
-		if (lstat(path, &st) < 0)
-			return -1;
-		mode = st.st_mode;
-		orig_mode = mode;
-	} else
-		orig_mode = 0;
 	if (shared_repository < 0)
-		shared = -shared_repository;
+		tweak = -shared_repository;
 	else
-		shared = shared_repository;
-	tweak = shared;
+		tweak = shared_repository;
 
 	if (!(mode & S_IWUSR))
 		tweak &= ~0222;
@@ -422,55 +408,190 @@ int set_shared_perm(const char *path, int mode)
 	else
 		mode |= tweak;
 
-	if (S_ISDIR(mode)) {
+	return mode;
+}
+
+
+int adjust_shared_perm(const char *path)
+{
+	int old_mode, new_mode;
+
+	if (!shared_repository)
+		return 0;
+	if (get_st_mode_bits(path, &old_mode) < 0)
+		return -1;
+
+	new_mode = calc_shared_perm(old_mode);
+	if (S_ISDIR(old_mode)) {
 		/* Copy read bits to execute bits */
-		mode |= (shared & 0444) >> 2;
-		mode |= FORCE_DIR_SET_GID;
+		new_mode |= (new_mode & 0444) >> 2;
+		new_mode |= FORCE_DIR_SET_GID;
 	}
 
-	if (((shared_repository < 0
-	      ? (orig_mode & (FORCE_DIR_SET_GID | 0777))
-	      : (orig_mode & mode)) != mode) &&
-	    chmod(path, (mode & ~S_IFMT)) < 0)
+	if (((old_mode ^ new_mode) & ~S_IFMT) &&
+			chmod(path, (new_mode & ~S_IFMT)) < 0)
 		return -2;
 	return 0;
 }
 
-const char *relative_path(const char *abs, const char *base)
+static int have_same_root(const char *path1, const char *path2)
+{
+	int is_abs1, is_abs2;
+
+	is_abs1 = is_absolute_path(path1);
+	is_abs2 = is_absolute_path(path2);
+	return (is_abs1 && is_abs2 && tolower(path1[0]) == tolower(path2[0])) ||
+	       (!is_abs1 && !is_abs2);
+}
+
+/*
+ * Give path as relative to prefix.
+ *
+ * The strbuf may or may not be used, so do not assume it contains the
+ * returned path.
+ */
+const char *relative_path(const char *in, const char *prefix,
+			  struct strbuf *sb)
+{
+	int in_len = in ? strlen(in) : 0;
+	int prefix_len = prefix ? strlen(prefix) : 0;
+	int in_off = 0;
+	int prefix_off = 0;
+	int i = 0, j = 0;
+
+	if (!in_len)
+		return "./";
+	else if (!prefix_len)
+		return in;
+
+	if (have_same_root(in, prefix)) {
+		/* bypass dos_drive, for "c:" is identical to "C:" */
+		if (has_dos_drive_prefix(in)) {
+			i = 2;
+			j = 2;
+		}
+	} else {
+		return in;
+	}
+
+	while (i < prefix_len && j < in_len && prefix[i] == in[j]) {
+		if (is_dir_sep(prefix[i])) {
+			while (is_dir_sep(prefix[i]))
+				i++;
+			while (is_dir_sep(in[j]))
+				j++;
+			prefix_off = i;
+			in_off = j;
+		} else {
+			i++;
+			j++;
+		}
+	}
+
+	if (
+	    /* "prefix" seems like prefix of "in" */
+	    i >= prefix_len &&
+	    /*
+	     * but "/foo" is not a prefix of "/foobar"
+	     * (i.e. prefix not end with '/')
+	     */
+	    prefix_off < prefix_len) {
+		if (j >= in_len) {
+			/* in="/a/b", prefix="/a/b" */
+			in_off = in_len;
+		} else if (is_dir_sep(in[j])) {
+			/* in="/a/b/c", prefix="/a/b" */
+			while (is_dir_sep(in[j]))
+				j++;
+			in_off = j;
+		} else {
+			/* in="/a/bbb/c", prefix="/a/b" */
+			i = prefix_off;
+		}
+	} else if (
+		   /* "in" is short than "prefix" */
+		   j >= in_len &&
+		   /* "in" not end with '/' */
+		   in_off < in_len) {
+		if (is_dir_sep(prefix[i])) {
+			/* in="/a/b", prefix="/a/b/c/" */
+			while (is_dir_sep(prefix[i]))
+				i++;
+			in_off = in_len;
+		}
+	}
+	in += in_off;
+	in_len -= in_off;
+
+	if (i >= prefix_len) {
+		if (!in_len)
+			return "./";
+		else
+			return in;
+	}
+
+	strbuf_reset(sb);
+	strbuf_grow(sb, in_len);
+
+	while (i < prefix_len) {
+		if (is_dir_sep(prefix[i])) {
+			strbuf_addstr(sb, "../");
+			while (is_dir_sep(prefix[i]))
+				i++;
+			continue;
+		}
+		i++;
+	}
+	if (!is_dir_sep(prefix[prefix_len - 1]))
+		strbuf_addstr(sb, "../");
+
+	strbuf_addstr(sb, in);
+
+	return sb->buf;
+}
+
+/*
+ * A simpler implementation of relative_path
+ *
+ * Get relative path by removing "prefix" from "in". This function
+ * first appears in v1.5.6-1-g044bbbc, and makes git_dir shorter
+ * to increase performance when traversing the path to work_tree.
+ */
+const char *remove_leading_path(const char *in, const char *prefix)
 {
 	static char buf[PATH_MAX + 1];
 	int i = 0, j = 0;
 
-	if (!base || !base[0])
-		return abs;
-	while (base[i]) {
-		if (is_dir_sep(base[i])) {
-			if (!is_dir_sep(abs[j]))
-				return abs;
-			while (is_dir_sep(base[i]))
+	if (!prefix || !prefix[0])
+		return in;
+	while (prefix[i]) {
+		if (is_dir_sep(prefix[i])) {
+			if (!is_dir_sep(in[j]))
+				return in;
+			while (is_dir_sep(prefix[i]))
 				i++;
-			while (is_dir_sep(abs[j]))
+			while (is_dir_sep(in[j]))
 				j++;
 			continue;
-		} else if (abs[j] != base[i]) {
-			return abs;
+		} else if (in[j] != prefix[i]) {
+			return in;
 		}
 		i++;
 		j++;
 	}
 	if (
 	    /* "/foo" is a prefix of "/foo" */
-	    abs[j] &&
+	    in[j] &&
 	    /* "/foo" is not a prefix of "/foobar" */
-	    !is_dir_sep(base[i-1]) && !is_dir_sep(abs[j])
+	    !is_dir_sep(prefix[i-1]) && !is_dir_sep(in[j])
 	   )
-		return abs;
-	while (is_dir_sep(abs[j]))
+		return in;
+	while (is_dir_sep(in[j]))
 		j++;
-	if (!abs[j])
+	if (!in[j])
 		strcpy(buf, ".");
 	else
-		strcpy(buf, abs + j);
+		strcpy(buf, in + j);
 	return buf;
 }
 
@@ -487,8 +608,14 @@ const char *relative_path(const char *abs, const char *base)
  *
  * Note that this function is purely textual.  It does not follow symlinks,
  * verify the existence of the path, or make any system calls.
+ *
+ * prefix_len != NULL is for a specific case of prefix_pathspec():
+ * assume that src == dst and src[0..prefix_len-1] is already
+ * normalized, any time "../" eats up to the prefix_len part,
+ * prefix_len is reduced. In the end prefix_len is the remaining
+ * prefix that has not been overridden by user pathspec.
  */
-int normalize_path_copy(char *dst, const char *src)
+int normalize_path_copy_len(char *dst, const char *src, int *prefix_len)
 {
 	char *dst0;
 
@@ -563,11 +690,18 @@ int normalize_path_copy(char *dst, const char *src)
 		/* Windows: dst[-1] cannot be backslash anymore */
 		while (dst0 < dst && dst[-1] != '/')
 			dst--;
+		if (prefix_len && *prefix_len > dst - dst0)
+			*prefix_len = dst - dst0;
 	}
 	*dst = '\0';
 	return 0;
 }
 
+int normalize_path_copy(char *dst, const char *src)
+{
+	return normalize_path_copy_len(dst, src, NULL);
+}
+
 /*
  * path = Canonical absolute path
  * prefixes = string_list containing normalized, absolute paths without
@@ -696,3 +830,36 @@ int offset_1st_component(const char *path)
 		return 2 + is_dir_sep(path[2]);
 	return is_dir_sep(path[0]);
 }
+
+static int only_spaces_and_periods(const char *path, size_t len, size_t skip)
+{
+	if (len < skip)
+		return 0;
+	len -= skip;
+	path += skip;
+	while (len-- > 0) {
+		char c = *(path++);
+		if (c != ' ' && c != '.')
+			return 0;
+	}
+	return 1;
+}
+
+int is_ntfs_dotgit(const char *name)
+{
+	int len;
+
+	for (len = 0; ; len++)
+		if (!name[len] || name[len] == '\\' || is_dir_sep(name[len])) {
+			if (only_spaces_and_periods(name, len, 4) &&
+					!strncasecmp(name, ".git", 4))
+				return 1;
+			if (only_spaces_and_periods(name, len, 5) &&
+					!strncasecmp(name, "git~1", 5))
+				return 1;
+			if (name[len] != '\\')
+				return 0;
+			name += len + 1;
+			len = -1;
+		}
+}