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-rw-r--r--path.c240
1 files changed, 187 insertions, 53 deletions
diff --git a/path.c b/path.c
index d3d3f8b8ad..24594c4112 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