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![Junio C Hamano](/assets/img/avatar_default.png)
Code clean-up with optimization for the codepath that checks (non-)existence of loose objects. * jk/loose-object-cache: odb_load_loose_cache: fix strbuf leak fetch-pack: drop custom loose object cache sha1-file: use loose object cache for quick existence check object-store: provide helpers for loose_objects_cache sha1-file: use an object_directory for the main object dir handle alternates paths the same as the main object dir sha1_file_name(): overwrite buffer instead of appending rename "alternate_object_database" to "object_directory" submodule--helper: prefer strip_suffix() to ends_with() fsck: do not reuse child_process structs
1456 lines
34 KiB
C
1456 lines
34 KiB
C
/*
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* Utilities for paths and pathnames
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*/
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#include "cache.h"
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#include "repository.h"
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#include "strbuf.h"
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#include "string-list.h"
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#include "dir.h"
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#include "worktree.h"
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#include "submodule-config.h"
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#include "path.h"
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#include "packfile.h"
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#include "object-store.h"
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static int get_st_mode_bits(const char *path, int *mode)
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{
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struct stat st;
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if (lstat(path, &st) < 0)
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return -1;
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*mode = st.st_mode;
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return 0;
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}
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static char bad_path[] = "/bad-path/";
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static struct strbuf *get_pathname(void)
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{
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static struct strbuf pathname_array[4] = {
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STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT
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};
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static int index;
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struct strbuf *sb = &pathname_array[index];
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index = (index + 1) % ARRAY_SIZE(pathname_array);
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strbuf_reset(sb);
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return sb;
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}
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static const char *cleanup_path(const char *path)
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{
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/* Clean it up */
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if (skip_prefix(path, "./", &path)) {
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while (*path == '/')
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path++;
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}
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return path;
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}
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static void strbuf_cleanup_path(struct strbuf *sb)
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{
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const char *path = cleanup_path(sb->buf);
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if (path > sb->buf)
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strbuf_remove(sb, 0, path - sb->buf);
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}
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char *mksnpath(char *buf, size_t n, const char *fmt, ...)
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{
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va_list args;
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unsigned len;
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va_start(args, fmt);
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len = vsnprintf(buf, n, fmt, args);
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va_end(args);
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if (len >= n) {
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strlcpy(buf, bad_path, n);
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return buf;
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}
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return (char *)cleanup_path(buf);
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}
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static int dir_prefix(const char *buf, const char *dir)
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{
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int len = strlen(dir);
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return !strncmp(buf, dir, len) &&
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(is_dir_sep(buf[len]) || buf[len] == '\0');
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}
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/* $buf =~ m|$dir/+$file| but without regex */
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static int is_dir_file(const char *buf, const char *dir, const char *file)
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{
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int len = strlen(dir);
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if (strncmp(buf, dir, len) || !is_dir_sep(buf[len]))
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return 0;
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while (is_dir_sep(buf[len]))
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len++;
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return !strcmp(buf + len, file);
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}
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static void replace_dir(struct strbuf *buf, int len, const char *newdir)
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{
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int newlen = strlen(newdir);
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int need_sep = (buf->buf[len] && !is_dir_sep(buf->buf[len])) &&
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!is_dir_sep(newdir[newlen - 1]);
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if (need_sep)
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len--; /* keep one char, to be replaced with '/' */
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strbuf_splice(buf, 0, len, newdir, newlen);
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if (need_sep)
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buf->buf[newlen] = '/';
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}
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struct common_dir {
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/* Not considered garbage for report_linked_checkout_garbage */
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unsigned ignore_garbage:1;
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unsigned is_dir:1;
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/* Not common even though its parent is */
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unsigned exclude:1;
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const char *dirname;
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};
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static struct common_dir common_list[] = {
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{ 0, 1, 0, "branches" },
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{ 0, 1, 0, "common" },
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{ 0, 1, 0, "hooks" },
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{ 0, 1, 0, "info" },
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{ 0, 0, 1, "info/sparse-checkout" },
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{ 1, 1, 0, "logs" },
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{ 1, 1, 1, "logs/HEAD" },
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{ 0, 1, 1, "logs/refs/bisect" },
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{ 0, 1, 0, "lost-found" },
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{ 0, 1, 0, "objects" },
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{ 0, 1, 0, "refs" },
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{ 0, 1, 1, "refs/bisect" },
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{ 0, 1, 1, "refs/worktree" },
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{ 0, 1, 0, "remotes" },
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{ 0, 1, 0, "worktrees" },
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{ 0, 1, 0, "rr-cache" },
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{ 0, 1, 0, "svn" },
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{ 0, 0, 0, "config" },
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{ 1, 0, 0, "gc.pid" },
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{ 0, 0, 0, "packed-refs" },
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{ 0, 0, 0, "shallow" },
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{ 0, 0, 0, NULL }
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};
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/*
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* A compressed trie. A trie node consists of zero or more characters that
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* are common to all elements with this prefix, optionally followed by some
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* children. If value is not NULL, the trie node is a terminal node.
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*
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* For example, consider the following set of strings:
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* abc
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* def
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* definite
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* definition
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*
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* The trie would look like:
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* root: len = 0, children a and d non-NULL, value = NULL.
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* a: len = 2, contents = bc, value = (data for "abc")
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* d: len = 2, contents = ef, children i non-NULL, value = (data for "def")
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* i: len = 3, contents = nit, children e and i non-NULL, value = NULL
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* e: len = 0, children all NULL, value = (data for "definite")
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* i: len = 2, contents = on, children all NULL,
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* value = (data for "definition")
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*/
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struct trie {
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struct trie *children[256];
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int len;
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char *contents;
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void *value;
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};
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static struct trie *make_trie_node(const char *key, void *value)
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{
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struct trie *new_node = xcalloc(1, sizeof(*new_node));
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new_node->len = strlen(key);
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if (new_node->len) {
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new_node->contents = xmalloc(new_node->len);
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memcpy(new_node->contents, key, new_node->len);
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}
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new_node->value = value;
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return new_node;
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}
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/*
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* Add a key/value pair to a trie. The key is assumed to be \0-terminated.
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* If there was an existing value for this key, return it.
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*/
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static void *add_to_trie(struct trie *root, const char *key, void *value)
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{
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struct trie *child;
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void *old;
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int i;
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if (!*key) {
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/* we have reached the end of the key */
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old = root->value;
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root->value = value;
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return old;
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}
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for (i = 0; i < root->len; i++) {
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if (root->contents[i] == key[i])
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continue;
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/*
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* Split this node: child will contain this node's
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* existing children.
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*/
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child = xmalloc(sizeof(*child));
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memcpy(child->children, root->children, sizeof(root->children));
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child->len = root->len - i - 1;
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if (child->len) {
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child->contents = xstrndup(root->contents + i + 1,
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child->len);
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}
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child->value = root->value;
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root->value = NULL;
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root->len = i;
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memset(root->children, 0, sizeof(root->children));
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root->children[(unsigned char)root->contents[i]] = child;
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/* This is the newly-added child. */
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root->children[(unsigned char)key[i]] =
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make_trie_node(key + i + 1, value);
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return NULL;
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}
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/* We have matched the entire compressed section */
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if (key[i]) {
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child = root->children[(unsigned char)key[root->len]];
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if (child) {
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return add_to_trie(child, key + root->len + 1, value);
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} else {
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child = make_trie_node(key + root->len + 1, value);
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root->children[(unsigned char)key[root->len]] = child;
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return NULL;
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}
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}
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old = root->value;
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root->value = value;
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return old;
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}
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typedef int (*match_fn)(const char *unmatched, void *data, void *baton);
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/*
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* Search a trie for some key. Find the longest /-or-\0-terminated
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* prefix of the key for which the trie contains a value. Call fn
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* with the unmatched portion of the key and the found value, and
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* return its return value. If there is no such prefix, return -1.
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*
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* The key is partially normalized: consecutive slashes are skipped.
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*
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* For example, consider the trie containing only [refs,
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* refs/worktree] (both with values).
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*
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* | key | unmatched | val from node | return value |
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* |-----------------|------------|---------------|--------------|
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* | a | not called | n/a | -1 |
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* | refs | \0 | refs | as per fn |
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* | refs/ | / | refs | as per fn |
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* | refs/w | /w | refs | as per fn |
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* | refs/worktree | \0 | refs/worktree | as per fn |
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* | refs/worktree/ | / | refs/worktree | as per fn |
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* | refs/worktree/a | /a | refs/worktree | as per fn |
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* |-----------------|------------|---------------|--------------|
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*
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*/
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static int trie_find(struct trie *root, const char *key, match_fn fn,
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void *baton)
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{
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int i;
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int result;
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struct trie *child;
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if (!*key) {
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/* we have reached the end of the key */
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if (root->value && !root->len)
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return fn(key, root->value, baton);
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else
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return -1;
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}
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for (i = 0; i < root->len; i++) {
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/* Partial path normalization: skip consecutive slashes. */
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if (key[i] == '/' && key[i+1] == '/') {
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key++;
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continue;
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}
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if (root->contents[i] != key[i])
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return -1;
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}
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/* Matched the entire compressed section */
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key += i;
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if (!*key)
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/* End of key */
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return fn(key, root->value, baton);
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/* Partial path normalization: skip consecutive slashes */
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while (key[0] == '/' && key[1] == '/')
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key++;
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child = root->children[(unsigned char)*key];
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if (child)
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result = trie_find(child, key + 1, fn, baton);
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else
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result = -1;
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if (result >= 0 || (*key != '/' && *key != 0))
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return result;
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if (root->value)
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return fn(key, root->value, baton);
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else
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return -1;
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}
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static struct trie common_trie;
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static int common_trie_done_setup;
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static void init_common_trie(void)
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{
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struct common_dir *p;
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if (common_trie_done_setup)
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return;
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for (p = common_list; p->dirname; p++)
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add_to_trie(&common_trie, p->dirname, p);
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common_trie_done_setup = 1;
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}
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/*
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* Helper function for update_common_dir: returns 1 if the dir
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* prefix is common.
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*/
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static int check_common(const char *unmatched, void *value, void *baton)
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{
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struct common_dir *dir = value;
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if (!dir)
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return 0;
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if (dir->is_dir && (unmatched[0] == 0 || unmatched[0] == '/'))
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return !dir->exclude;
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if (!dir->is_dir && unmatched[0] == 0)
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return !dir->exclude;
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return 0;
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}
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static void update_common_dir(struct strbuf *buf, int git_dir_len,
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const char *common_dir)
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{
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char *base = buf->buf + git_dir_len;
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init_common_trie();
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if (trie_find(&common_trie, base, check_common, NULL) > 0)
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replace_dir(buf, git_dir_len, common_dir);
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}
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void report_linked_checkout_garbage(void)
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{
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struct strbuf sb = STRBUF_INIT;
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const struct common_dir *p;
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int len;
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if (!the_repository->different_commondir)
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return;
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strbuf_addf(&sb, "%s/", get_git_dir());
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len = sb.len;
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for (p = common_list; p->dirname; p++) {
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const char *path = p->dirname;
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if (p->ignore_garbage)
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continue;
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strbuf_setlen(&sb, len);
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strbuf_addstr(&sb, path);
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if (file_exists(sb.buf))
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report_garbage(PACKDIR_FILE_GARBAGE, sb.buf);
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}
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strbuf_release(&sb);
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}
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static void adjust_git_path(const struct repository *repo,
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struct strbuf *buf, int git_dir_len)
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{
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const char *base = buf->buf + git_dir_len;
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if (is_dir_file(base, "info", "grafts"))
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strbuf_splice(buf, 0, buf->len,
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repo->graft_file, strlen(repo->graft_file));
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else if (!strcmp(base, "index"))
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strbuf_splice(buf, 0, buf->len,
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repo->index_file, strlen(repo->index_file));
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else if (dir_prefix(base, "objects"))
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replace_dir(buf, git_dir_len + 7, repo->objects->odb->path);
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else if (git_hooks_path && dir_prefix(base, "hooks"))
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replace_dir(buf, git_dir_len + 5, git_hooks_path);
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else if (repo->different_commondir)
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update_common_dir(buf, git_dir_len, repo->commondir);
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}
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static void strbuf_worktree_gitdir(struct strbuf *buf,
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const struct repository *repo,
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const struct worktree *wt)
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{
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if (!wt)
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strbuf_addstr(buf, repo->gitdir);
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else if (!wt->id)
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strbuf_addstr(buf, repo->commondir);
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else
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strbuf_git_common_path(buf, repo, "worktrees/%s", wt->id);
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}
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static void do_git_path(const struct repository *repo,
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const struct worktree *wt, struct strbuf *buf,
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const char *fmt, va_list args)
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{
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int gitdir_len;
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strbuf_worktree_gitdir(buf, repo, wt);
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if (buf->len && !is_dir_sep(buf->buf[buf->len - 1]))
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strbuf_addch(buf, '/');
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gitdir_len = buf->len;
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strbuf_vaddf(buf, fmt, args);
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if (!wt)
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adjust_git_path(repo, buf, gitdir_len);
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strbuf_cleanup_path(buf);
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}
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char *repo_git_path(const struct repository *repo,
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const char *fmt, ...)
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{
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struct strbuf path = STRBUF_INIT;
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va_list args;
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va_start(args, fmt);
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do_git_path(repo, NULL, &path, fmt, args);
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va_end(args);
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return strbuf_detach(&path, NULL);
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}
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|
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void strbuf_repo_git_path(struct strbuf *sb,
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const struct repository *repo,
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const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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do_git_path(repo, NULL, sb, fmt, args);
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va_end(args);
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}
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char *git_path_buf(struct strbuf *buf, const char *fmt, ...)
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{
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va_list args;
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strbuf_reset(buf);
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va_start(args, fmt);
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do_git_path(the_repository, NULL, buf, fmt, args);
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va_end(args);
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return buf->buf;
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}
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|
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void strbuf_git_path(struct strbuf *sb, const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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do_git_path(the_repository, NULL, sb, fmt, args);
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va_end(args);
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}
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|
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const char *git_path(const char *fmt, ...)
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{
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struct strbuf *pathname = get_pathname();
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va_list args;
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va_start(args, fmt);
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do_git_path(the_repository, NULL, pathname, fmt, args);
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va_end(args);
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return pathname->buf;
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}
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|
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char *git_pathdup(const char *fmt, ...)
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{
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struct strbuf path = STRBUF_INIT;
|
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va_list args;
|
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va_start(args, fmt);
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do_git_path(the_repository, NULL, &path, fmt, args);
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va_end(args);
|
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return strbuf_detach(&path, NULL);
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}
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|
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char *mkpathdup(const char *fmt, ...)
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{
|
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struct strbuf sb = STRBUF_INIT;
|
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va_list args;
|
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va_start(args, fmt);
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strbuf_vaddf(&sb, fmt, args);
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va_end(args);
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strbuf_cleanup_path(&sb);
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return strbuf_detach(&sb, NULL);
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}
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|
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const char *mkpath(const char *fmt, ...)
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{
|
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va_list args;
|
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struct strbuf *pathname = get_pathname();
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va_start(args, fmt);
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strbuf_vaddf(pathname, fmt, args);
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va_end(args);
|
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return cleanup_path(pathname->buf);
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}
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|
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const char *worktree_git_path(const struct worktree *wt, const char *fmt, ...)
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|
{
|
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struct strbuf *pathname = get_pathname();
|
|
va_list args;
|
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va_start(args, fmt);
|
|
do_git_path(the_repository, wt, pathname, fmt, args);
|
|
va_end(args);
|
|
return pathname->buf;
|
|
}
|
|
|
|
static void do_worktree_path(const struct repository *repo,
|
|
struct strbuf *buf,
|
|
const char *fmt, va_list args)
|
|
{
|
|
strbuf_addstr(buf, repo->worktree);
|
|
if(buf->len && !is_dir_sep(buf->buf[buf->len - 1]))
|
|
strbuf_addch(buf, '/');
|
|
|
|
strbuf_vaddf(buf, fmt, args);
|
|
strbuf_cleanup_path(buf);
|
|
}
|
|
|
|
char *repo_worktree_path(const struct repository *repo, const char *fmt, ...)
|
|
{
|
|
struct strbuf path = STRBUF_INIT;
|
|
va_list args;
|
|
|
|
if (!repo->worktree)
|
|
return NULL;
|
|
|
|
va_start(args, fmt);
|
|
do_worktree_path(repo, &path, fmt, args);
|
|
va_end(args);
|
|
|
|
return strbuf_detach(&path, NULL);
|
|
}
|
|
|
|
void strbuf_repo_worktree_path(struct strbuf *sb,
|
|
const struct repository *repo,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
if (!repo->worktree)
|
|
return;
|
|
|
|
va_start(args, fmt);
|
|
do_worktree_path(repo, sb, fmt, args);
|
|
va_end(args);
|
|
}
|
|
|
|
/* Returns 0 on success, negative on failure. */
|
|
static int do_submodule_path(struct strbuf *buf, const char *path,
|
|
const char *fmt, va_list args)
|
|
{
|
|
struct strbuf git_submodule_common_dir = STRBUF_INIT;
|
|
struct strbuf git_submodule_dir = STRBUF_INIT;
|
|
int ret;
|
|
|
|
ret = submodule_to_gitdir(&git_submodule_dir, path);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
strbuf_complete(&git_submodule_dir, '/');
|
|
strbuf_addbuf(buf, &git_submodule_dir);
|
|
strbuf_vaddf(buf, fmt, args);
|
|
|
|
if (get_common_dir_noenv(&git_submodule_common_dir, git_submodule_dir.buf))
|
|
update_common_dir(buf, git_submodule_dir.len, git_submodule_common_dir.buf);
|
|
|
|
strbuf_cleanup_path(buf);
|
|
|
|
cleanup:
|
|
strbuf_release(&git_submodule_dir);
|
|
strbuf_release(&git_submodule_common_dir);
|
|
return ret;
|
|
}
|
|
|
|
char *git_pathdup_submodule(const char *path, const char *fmt, ...)
|
|
{
|
|
int err;
|
|
va_list args;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
va_start(args, fmt);
|
|
err = do_submodule_path(&buf, path, fmt, args);
|
|
va_end(args);
|
|
if (err) {
|
|
strbuf_release(&buf);
|
|
return NULL;
|
|
}
|
|
return strbuf_detach(&buf, NULL);
|
|
}
|
|
|
|
int strbuf_git_path_submodule(struct strbuf *buf, const char *path,
|
|
const char *fmt, ...)
|
|
{
|
|
int err;
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
err = do_submodule_path(buf, path, fmt, args);
|
|
va_end(args);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void do_git_common_path(const struct repository *repo,
|
|
struct strbuf *buf,
|
|
const char *fmt,
|
|
va_list args)
|
|
{
|
|
strbuf_addstr(buf, repo->commondir);
|
|
if (buf->len && !is_dir_sep(buf->buf[buf->len - 1]))
|
|
strbuf_addch(buf, '/');
|
|
strbuf_vaddf(buf, fmt, args);
|
|
strbuf_cleanup_path(buf);
|
|
}
|
|
|
|
const char *git_common_path(const char *fmt, ...)
|
|
{
|
|
struct strbuf *pathname = get_pathname();
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
do_git_common_path(the_repository, pathname, fmt, args);
|
|
va_end(args);
|
|
return pathname->buf;
|
|
}
|
|
|
|
void strbuf_git_common_path(struct strbuf *sb,
|
|
const struct repository *repo,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
do_git_common_path(repo, sb, fmt, args);
|
|
va_end(args);
|
|
}
|
|
|
|
int validate_headref(const char *path)
|
|
{
|
|
struct stat st;
|
|
char buffer[256];
|
|
const char *refname;
|
|
struct object_id oid;
|
|
int fd;
|
|
ssize_t len;
|
|
|
|
if (lstat(path, &st) < 0)
|
|
return -1;
|
|
|
|
/* Make sure it is a "refs/.." symlink */
|
|
if (S_ISLNK(st.st_mode)) {
|
|
len = readlink(path, buffer, sizeof(buffer)-1);
|
|
if (len >= 5 && !memcmp("refs/", buffer, 5))
|
|
return 0;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Anything else, just open it and try to see if it is a symbolic ref.
|
|
*/
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0)
|
|
return -1;
|
|
len = read_in_full(fd, buffer, sizeof(buffer)-1);
|
|
close(fd);
|
|
|
|
if (len < 0)
|
|
return -1;
|
|
buffer[len] = '\0';
|
|
|
|
/*
|
|
* Is it a symbolic ref?
|
|
*/
|
|
if (skip_prefix(buffer, "ref:", &refname)) {
|
|
while (isspace(*refname))
|
|
refname++;
|
|
if (starts_with(refname, "refs/"))
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Is this a detached HEAD?
|
|
*/
|
|
if (!get_oid_hex(buffer, &oid))
|
|
return 0;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static struct passwd *getpw_str(const char *username, size_t len)
|
|
{
|
|
struct passwd *pw;
|
|
char *username_z = xmemdupz(username, len);
|
|
pw = getpwnam(username_z);
|
|
free(username_z);
|
|
return pw;
|
|
}
|
|
|
|
/*
|
|
* Return a string with ~ and ~user expanded via getpw*. If buf != NULL,
|
|
* then it is a newly allocated string. Returns NULL on getpw failure or
|
|
* if path is NULL.
|
|
*
|
|
* If real_home is true, real_path($HOME) is used in the expansion.
|
|
*/
|
|
char *expand_user_path(const char *path, int real_home)
|
|
{
|
|
struct strbuf user_path = STRBUF_INIT;
|
|
const char *to_copy = path;
|
|
|
|
if (path == NULL)
|
|
goto return_null;
|
|
if (path[0] == '~') {
|
|
const char *first_slash = strchrnul(path, '/');
|
|
const char *username = path + 1;
|
|
size_t username_len = first_slash - username;
|
|
if (username_len == 0) {
|
|
const char *home = getenv("HOME");
|
|
if (!home)
|
|
goto return_null;
|
|
if (real_home)
|
|
strbuf_add_real_path(&user_path, home);
|
|
else
|
|
strbuf_addstr(&user_path, home);
|
|
#ifdef GIT_WINDOWS_NATIVE
|
|
convert_slashes(user_path.buf);
|
|
#endif
|
|
} else {
|
|
struct passwd *pw = getpw_str(username, username_len);
|
|
if (!pw)
|
|
goto return_null;
|
|
strbuf_addstr(&user_path, pw->pw_dir);
|
|
}
|
|
to_copy = first_slash;
|
|
}
|
|
strbuf_addstr(&user_path, to_copy);
|
|
return strbuf_detach(&user_path, NULL);
|
|
return_null:
|
|
strbuf_release(&user_path);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* First, one directory to try is determined by the following algorithm.
|
|
*
|
|
* (0) If "strict" is given, the path is used as given and no DWIM is
|
|
* done. Otherwise:
|
|
* (1) "~/path" to mean path under the running user's home directory;
|
|
* (2) "~user/path" to mean path under named user's home directory;
|
|
* (3) "relative/path" to mean cwd relative directory; or
|
|
* (4) "/absolute/path" to mean absolute directory.
|
|
*
|
|
* Unless "strict" is given, we check "%s/.git", "%s", "%s.git/.git", "%s.git"
|
|
* in this order. We select the first one that is a valid git repository, and
|
|
* chdir() to it. If none match, or we fail to chdir, we return NULL.
|
|
*
|
|
* If all goes well, we return the directory we used to chdir() (but
|
|
* before ~user is expanded), avoiding getcwd() resolving symbolic
|
|
* links. User relative paths are also returned as they are given,
|
|
* except DWIM suffixing.
|
|
*/
|
|
const char *enter_repo(const char *path, int strict)
|
|
{
|
|
static struct strbuf validated_path = STRBUF_INIT;
|
|
static struct strbuf used_path = STRBUF_INIT;
|
|
|
|
if (!path)
|
|
return NULL;
|
|
|
|
if (!strict) {
|
|
static const char *suffix[] = {
|
|
"/.git", "", ".git/.git", ".git", NULL,
|
|
};
|
|
const char *gitfile;
|
|
int len = strlen(path);
|
|
int i;
|
|
while ((1 < len) && (path[len-1] == '/'))
|
|
len--;
|
|
|
|
/*
|
|
* We can handle arbitrary-sized buffers, but this remains as a
|
|
* sanity check on untrusted input.
|
|
*/
|
|
if (PATH_MAX <= len)
|
|
return NULL;
|
|
|
|
strbuf_reset(&used_path);
|
|
strbuf_reset(&validated_path);
|
|
strbuf_add(&used_path, path, len);
|
|
strbuf_add(&validated_path, path, len);
|
|
|
|
if (used_path.buf[0] == '~') {
|
|
char *newpath = expand_user_path(used_path.buf, 0);
|
|
if (!newpath)
|
|
return NULL;
|
|
strbuf_attach(&used_path, newpath, strlen(newpath),
|
|
strlen(newpath));
|
|
}
|
|
for (i = 0; suffix[i]; i++) {
|
|
struct stat st;
|
|
size_t baselen = used_path.len;
|
|
strbuf_addstr(&used_path, suffix[i]);
|
|
if (!stat(used_path.buf, &st) &&
|
|
(S_ISREG(st.st_mode) ||
|
|
(S_ISDIR(st.st_mode) && is_git_directory(used_path.buf)))) {
|
|
strbuf_addstr(&validated_path, suffix[i]);
|
|
break;
|
|
}
|
|
strbuf_setlen(&used_path, baselen);
|
|
}
|
|
if (!suffix[i])
|
|
return NULL;
|
|
gitfile = read_gitfile(used_path.buf);
|
|
if (gitfile) {
|
|
strbuf_reset(&used_path);
|
|
strbuf_addstr(&used_path, gitfile);
|
|
}
|
|
if (chdir(used_path.buf))
|
|
return NULL;
|
|
path = validated_path.buf;
|
|
}
|
|
else {
|
|
const char *gitfile = read_gitfile(path);
|
|
if (gitfile)
|
|
path = gitfile;
|
|
if (chdir(path))
|
|
return NULL;
|
|
}
|
|
|
|
if (is_git_directory(".")) {
|
|
set_git_dir(".");
|
|
check_repository_format();
|
|
return path;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int calc_shared_perm(int mode)
|
|
{
|
|
int tweak;
|
|
|
|
if (get_shared_repository() < 0)
|
|
tweak = -get_shared_repository();
|
|
else
|
|
tweak = get_shared_repository();
|
|
|
|
if (!(mode & S_IWUSR))
|
|
tweak &= ~0222;
|
|
if (mode & S_IXUSR)
|
|
/* Copy read bits to execute bits */
|
|
tweak |= (tweak & 0444) >> 2;
|
|
if (get_shared_repository() < 0)
|
|
mode = (mode & ~0777) | tweak;
|
|
else
|
|
mode |= tweak;
|
|
|
|
return mode;
|
|
}
|
|
|
|
|
|
int adjust_shared_perm(const char *path)
|
|
{
|
|
int old_mode, new_mode;
|
|
|
|
if (!get_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 */
|
|
new_mode |= (new_mode & 0444) >> 2;
|
|
new_mode |= FORCE_DIR_SET_GID;
|
|
}
|
|
|
|
if (((old_mode ^ new_mode) & ~S_IFMT) &&
|
|
chmod(path, (new_mode & ~S_IFMT)) < 0)
|
|
return -2;
|
|
return 0;
|
|
}
|
|
|
|
void safe_create_dir(const char *dir, int share)
|
|
{
|
|
if (mkdir(dir, 0777) < 0) {
|
|
if (errno != EEXIST) {
|
|
perror(dir);
|
|
exit(1);
|
|
}
|
|
}
|
|
else if (share && adjust_shared_perm(dir))
|
|
die(_("Could not make %s writable by group"), dir);
|
|
}
|
|
|
|
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:" */
|
|
i = j = has_dos_drive_prefix(in);
|
|
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 struct strbuf buf = STRBUF_INIT;
|
|
int i = 0, j = 0;
|
|
|
|
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(in[j]))
|
|
j++;
|
|
continue;
|
|
} else if (in[j] != prefix[i]) {
|
|
return in;
|
|
}
|
|
i++;
|
|
j++;
|
|
}
|
|
if (
|
|
/* "/foo" is a prefix of "/foo" */
|
|
in[j] &&
|
|
/* "/foo" is not a prefix of "/foobar" */
|
|
!is_dir_sep(prefix[i-1]) && !is_dir_sep(in[j])
|
|
)
|
|
return in;
|
|
while (is_dir_sep(in[j]))
|
|
j++;
|
|
|
|
strbuf_reset(&buf);
|
|
if (!in[j])
|
|
strbuf_addstr(&buf, ".");
|
|
else
|
|
strbuf_addstr(&buf, in + j);
|
|
return buf.buf;
|
|
}
|
|
|
|
/*
|
|
* It is okay if dst == src, but they should not overlap otherwise.
|
|
*
|
|
* Performs the following normalizations on src, storing the result in dst:
|
|
* - Ensures that components are separated by '/' (Windows only)
|
|
* - Squashes sequences of '/' except "//server/share" on Windows
|
|
* - Removes "." components.
|
|
* - Removes ".." components, and the components the precede them.
|
|
* Returns failure (non-zero) if a ".." component appears as first path
|
|
* component anytime during the normalization. Otherwise, returns success (0).
|
|
*
|
|
* 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.
|
|
*
|
|
* NEEDSWORK: This function doesn't perform normalization w.r.t. trailing '/'.
|
|
* For everything but the root folder itself, the normalized path should not
|
|
* end with a '/', then the callers need to be fixed up accordingly.
|
|
*
|
|
*/
|
|
int normalize_path_copy_len(char *dst, const char *src, int *prefix_len)
|
|
{
|
|
char *dst0;
|
|
const char *end;
|
|
|
|
/*
|
|
* Copy initial part of absolute path: "/", "C:/", "//server/share/".
|
|
*/
|
|
end = src + offset_1st_component(src);
|
|
while (src < end) {
|
|
char c = *src++;
|
|
if (is_dir_sep(c))
|
|
c = '/';
|
|
*dst++ = c;
|
|
}
|
|
dst0 = dst;
|
|
|
|
while (is_dir_sep(*src))
|
|
src++;
|
|
|
|
for (;;) {
|
|
char c = *src;
|
|
|
|
/*
|
|
* A path component that begins with . could be
|
|
* special:
|
|
* (1) "." and ends -- ignore and terminate.
|
|
* (2) "./" -- ignore them, eat slash and continue.
|
|
* (3) ".." and ends -- strip one and terminate.
|
|
* (4) "../" -- strip one, eat slash and continue.
|
|
*/
|
|
if (c == '.') {
|
|
if (!src[1]) {
|
|
/* (1) */
|
|
src++;
|
|
} else if (is_dir_sep(src[1])) {
|
|
/* (2) */
|
|
src += 2;
|
|
while (is_dir_sep(*src))
|
|
src++;
|
|
continue;
|
|
} else if (src[1] == '.') {
|
|
if (!src[2]) {
|
|
/* (3) */
|
|
src += 2;
|
|
goto up_one;
|
|
} else if (is_dir_sep(src[2])) {
|
|
/* (4) */
|
|
src += 3;
|
|
while (is_dir_sep(*src))
|
|
src++;
|
|
goto up_one;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* copy up to the next '/', and eat all '/' */
|
|
while ((c = *src++) != '\0' && !is_dir_sep(c))
|
|
*dst++ = c;
|
|
if (is_dir_sep(c)) {
|
|
*dst++ = '/';
|
|
while (is_dir_sep(c))
|
|
c = *src++;
|
|
src--;
|
|
} else if (!c)
|
|
break;
|
|
continue;
|
|
|
|
up_one:
|
|
/*
|
|
* dst0..dst is prefix portion, and dst[-1] is '/';
|
|
* go up one level.
|
|
*/
|
|
dst--; /* go to trailing '/' */
|
|
if (dst <= dst0)
|
|
return -1;
|
|
/* 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
|
|
* trailing slashes (except for the root directory, which is denoted by "/").
|
|
*
|
|
* Determines, for each path in prefixes, whether the "prefix"
|
|
* is an ancestor directory of path. Returns the length of the longest
|
|
* ancestor directory, excluding any trailing slashes, or -1 if no prefix
|
|
* is an ancestor. (Note that this means 0 is returned if prefixes is
|
|
* ["/"].) "/foo" is not considered an ancestor of "/foobar". Directories
|
|
* are not considered to be their own ancestors. path must be in a
|
|
* canonical form: empty components, or "." or ".." components are not
|
|
* allowed.
|
|
*/
|
|
int longest_ancestor_length(const char *path, struct string_list *prefixes)
|
|
{
|
|
int i, max_len = -1;
|
|
|
|
if (!strcmp(path, "/"))
|
|
return -1;
|
|
|
|
for (i = 0; i < prefixes->nr; i++) {
|
|
const char *ceil = prefixes->items[i].string;
|
|
int len = strlen(ceil);
|
|
|
|
if (len == 1 && ceil[0] == '/')
|
|
len = 0; /* root matches anything, with length 0 */
|
|
else if (!strncmp(path, ceil, len) && path[len] == '/')
|
|
; /* match of length len */
|
|
else
|
|
continue; /* no match */
|
|
|
|
if (len > max_len)
|
|
max_len = len;
|
|
}
|
|
|
|
return max_len;
|
|
}
|
|
|
|
/* strip arbitrary amount of directory separators at end of path */
|
|
static inline int chomp_trailing_dir_sep(const char *path, int len)
|
|
{
|
|
while (len && is_dir_sep(path[len - 1]))
|
|
len--;
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* If path ends with suffix (complete path components), returns the
|
|
* part before suffix (sans trailing directory separators).
|
|
* Otherwise returns NULL.
|
|
*/
|
|
char *strip_path_suffix(const char *path, const char *suffix)
|
|
{
|
|
int path_len = strlen(path), suffix_len = strlen(suffix);
|
|
|
|
while (suffix_len) {
|
|
if (!path_len)
|
|
return NULL;
|
|
|
|
if (is_dir_sep(path[path_len - 1])) {
|
|
if (!is_dir_sep(suffix[suffix_len - 1]))
|
|
return NULL;
|
|
path_len = chomp_trailing_dir_sep(path, path_len);
|
|
suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
|
|
}
|
|
else if (path[--path_len] != suffix[--suffix_len])
|
|
return NULL;
|
|
}
|
|
|
|
if (path_len && !is_dir_sep(path[path_len - 1]))
|
|
return NULL;
|
|
return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
|
|
}
|
|
|
|
int daemon_avoid_alias(const char *p)
|
|
{
|
|
int sl, ndot;
|
|
|
|
/*
|
|
* This resurrects the belts and suspenders paranoia check by HPA
|
|
* done in <435560F7.4080006@zytor.com> thread, now enter_repo()
|
|
* does not do getcwd() based path canonicalization.
|
|
*
|
|
* sl becomes true immediately after seeing '/' and continues to
|
|
* be true as long as dots continue after that without intervening
|
|
* non-dot character.
|
|
*/
|
|
if (!p || (*p != '/' && *p != '~'))
|
|
return -1;
|
|
sl = 1; ndot = 0;
|
|
p++;
|
|
|
|
while (1) {
|
|
char ch = *p++;
|
|
if (sl) {
|
|
if (ch == '.')
|
|
ndot++;
|
|
else if (ch == '/') {
|
|
if (ndot < 3)
|
|
/* reject //, /./ and /../ */
|
|
return -1;
|
|
ndot = 0;
|
|
}
|
|
else if (ch == 0) {
|
|
if (0 < ndot && ndot < 3)
|
|
/* reject /.$ and /..$ */
|
|
return -1;
|
|
return 0;
|
|
}
|
|
else
|
|
sl = ndot = 0;
|
|
}
|
|
else if (ch == 0)
|
|
return 0;
|
|
else if (ch == '/') {
|
|
sl = 1;
|
|
ndot = 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)
|
|
{
|
|
size_t 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;
|
|
}
|
|
}
|
|
|
|
static int is_ntfs_dot_generic(const char *name,
|
|
const char *dotgit_name,
|
|
size_t len,
|
|
const char *dotgit_ntfs_shortname_prefix)
|
|
{
|
|
int saw_tilde;
|
|
size_t i;
|
|
|
|
if ((name[0] == '.' && !strncasecmp(name + 1, dotgit_name, len))) {
|
|
i = len + 1;
|
|
only_spaces_and_periods:
|
|
for (;;) {
|
|
char c = name[i++];
|
|
if (!c)
|
|
return 1;
|
|
if (c != ' ' && c != '.')
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Is it a regular NTFS short name, i.e. shortened to 6 characters,
|
|
* followed by ~1, ... ~4?
|
|
*/
|
|
if (!strncasecmp(name, dotgit_name, 6) && name[6] == '~' &&
|
|
name[7] >= '1' && name[7] <= '4') {
|
|
i = 8;
|
|
goto only_spaces_and_periods;
|
|
}
|
|
|
|
/*
|
|
* Is it a fall-back NTFS short name (for details, see
|
|
* https://en.wikipedia.org/wiki/8.3_filename?
|
|
*/
|
|
for (i = 0, saw_tilde = 0; i < 8; i++)
|
|
if (name[i] == '\0')
|
|
return 0;
|
|
else if (saw_tilde) {
|
|
if (name[i] < '0' || name[i] > '9')
|
|
return 0;
|
|
} else if (name[i] == '~') {
|
|
if (name[++i] < '1' || name[i] > '9')
|
|
return 0;
|
|
saw_tilde = 1;
|
|
} else if (i >= 6)
|
|
return 0;
|
|
else if (name[i] & 0x80) {
|
|
/*
|
|
* We know our needles contain only ASCII, so we clamp
|
|
* here to make the results of tolower() sane.
|
|
*/
|
|
return 0;
|
|
} else if (tolower(name[i]) != dotgit_ntfs_shortname_prefix[i])
|
|
return 0;
|
|
|
|
goto only_spaces_and_periods;
|
|
}
|
|
|
|
/*
|
|
* Inline helper to make sure compiler resolves strlen() on literals at
|
|
* compile time.
|
|
*/
|
|
static inline int is_ntfs_dot_str(const char *name, const char *dotgit_name,
|
|
const char *dotgit_ntfs_shortname_prefix)
|
|
{
|
|
return is_ntfs_dot_generic(name, dotgit_name, strlen(dotgit_name),
|
|
dotgit_ntfs_shortname_prefix);
|
|
}
|
|
|
|
int is_ntfs_dotgitmodules(const char *name)
|
|
{
|
|
return is_ntfs_dot_str(name, "gitmodules", "gi7eba");
|
|
}
|
|
|
|
int is_ntfs_dotgitignore(const char *name)
|
|
{
|
|
return is_ntfs_dot_str(name, "gitignore", "gi250a");
|
|
}
|
|
|
|
int is_ntfs_dotgitattributes(const char *name)
|
|
{
|
|
return is_ntfs_dot_str(name, "gitattributes", "gi7d29");
|
|
}
|
|
|
|
int looks_like_command_line_option(const char *str)
|
|
{
|
|
return str && str[0] == '-';
|
|
}
|
|
|
|
char *xdg_config_home(const char *filename)
|
|
{
|
|
const char *home, *config_home;
|
|
|
|
assert(filename);
|
|
config_home = getenv("XDG_CONFIG_HOME");
|
|
if (config_home && *config_home)
|
|
return mkpathdup("%s/git/%s", config_home, filename);
|
|
|
|
home = getenv("HOME");
|
|
if (home)
|
|
return mkpathdup("%s/.config/git/%s", home, filename);
|
|
return NULL;
|
|
}
|
|
|
|
char *xdg_cache_home(const char *filename)
|
|
{
|
|
const char *home, *cache_home;
|
|
|
|
assert(filename);
|
|
cache_home = getenv("XDG_CACHE_HOME");
|
|
if (cache_home && *cache_home)
|
|
return mkpathdup("%s/git/%s", cache_home, filename);
|
|
|
|
home = getenv("HOME");
|
|
if (home)
|
|
return mkpathdup("%s/.cache/git/%s", home, filename);
|
|
return NULL;
|
|
}
|
|
|
|
REPO_GIT_PATH_FUNC(cherry_pick_head, "CHERRY_PICK_HEAD")
|
|
REPO_GIT_PATH_FUNC(revert_head, "REVERT_HEAD")
|
|
REPO_GIT_PATH_FUNC(squash_msg, "SQUASH_MSG")
|
|
REPO_GIT_PATH_FUNC(merge_msg, "MERGE_MSG")
|
|
REPO_GIT_PATH_FUNC(merge_rr, "MERGE_RR")
|
|
REPO_GIT_PATH_FUNC(merge_mode, "MERGE_MODE")
|
|
REPO_GIT_PATH_FUNC(merge_head, "MERGE_HEAD")
|
|
REPO_GIT_PATH_FUNC(fetch_head, "FETCH_HEAD")
|
|
REPO_GIT_PATH_FUNC(shallow, "shallow")
|