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![Junio C Hamano](/assets/img/avatar_default.png)
* kb/lstat-cache: lstat_cache(): introduce clear_lstat_cache() function lstat_cache(): introduce invalidate_lstat_cache() function lstat_cache(): introduce has_dirs_only_path() function lstat_cache(): introduce has_symlink_or_noent_leading_path() function lstat_cache(): more cache effective symlink/directory detection
224 lines
5.7 KiB
C
224 lines
5.7 KiB
C
#include "cache.h"
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#include "blob.h"
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#include "dir.h"
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static void create_directories(const char *path, const struct checkout *state)
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{
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int len = strlen(path);
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char *buf = xmalloc(len + 1);
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const char *slash = path;
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while ((slash = strchr(slash+1, '/')) != NULL) {
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len = slash - path;
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memcpy(buf, path, len);
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buf[len] = 0;
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/*
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* For 'checkout-index --prefix=<dir>', <dir> is
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* allowed to be a symlink to an existing directory,
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* and we set 'state->base_dir_len' below, such that
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* we test the path components of the prefix with the
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* stat() function instead of the lstat() function.
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*/
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if (has_dirs_only_path(len, buf, state->base_dir_len))
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continue; /* ok, it is already a directory. */
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/*
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* If this mkdir() would fail, it could be that there
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* is already a symlink or something else exists
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* there, therefore we then try to unlink it and try
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* one more time to create the directory.
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*/
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if (mkdir(buf, 0777)) {
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if (errno == EEXIST && state->force &&
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!unlink(buf) && !mkdir(buf, 0777))
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continue;
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die("cannot create directory at %s", buf);
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}
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}
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free(buf);
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}
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static void remove_subtree(const char *path)
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{
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DIR *dir = opendir(path);
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struct dirent *de;
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char pathbuf[PATH_MAX];
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char *name;
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if (!dir)
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die("cannot opendir %s (%s)", path, strerror(errno));
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strcpy(pathbuf, path);
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name = pathbuf + strlen(path);
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*name++ = '/';
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while ((de = readdir(dir)) != NULL) {
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struct stat st;
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if (is_dot_or_dotdot(de->d_name))
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continue;
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strcpy(name, de->d_name);
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if (lstat(pathbuf, &st))
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die("cannot lstat %s (%s)", pathbuf, strerror(errno));
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if (S_ISDIR(st.st_mode))
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remove_subtree(pathbuf);
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else if (unlink(pathbuf))
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die("cannot unlink %s (%s)", pathbuf, strerror(errno));
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}
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closedir(dir);
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if (rmdir(path))
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die("cannot rmdir %s (%s)", path, strerror(errno));
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}
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static int create_file(const char *path, unsigned int mode)
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{
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mode = (mode & 0100) ? 0777 : 0666;
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return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
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}
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static void *read_blob_entry(struct cache_entry *ce, const char *path, unsigned long *size)
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{
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enum object_type type;
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void *new = read_sha1_file(ce->sha1, &type, size);
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if (new) {
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if (type == OBJ_BLOB)
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return new;
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free(new);
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}
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return NULL;
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}
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static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
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{
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int fd;
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long wrote;
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switch (ce->ce_mode & S_IFMT) {
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char *new;
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struct strbuf buf;
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unsigned long size;
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case S_IFREG:
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new = read_blob_entry(ce, path, &size);
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if (!new)
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return error("git checkout-index: unable to read sha1 file of %s (%s)",
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path, sha1_to_hex(ce->sha1));
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/*
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* Convert from git internal format to working tree format
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*/
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strbuf_init(&buf, 0);
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if (convert_to_working_tree(ce->name, new, size, &buf)) {
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size_t newsize = 0;
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free(new);
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new = strbuf_detach(&buf, &newsize);
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size = newsize;
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}
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if (to_tempfile) {
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strcpy(path, ".merge_file_XXXXXX");
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fd = mkstemp(path);
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} else
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fd = create_file(path, ce->ce_mode);
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if (fd < 0) {
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free(new);
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return error("git checkout-index: unable to create file %s (%s)",
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path, strerror(errno));
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}
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wrote = write_in_full(fd, new, size);
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close(fd);
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free(new);
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if (wrote != size)
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return error("git checkout-index: unable to write file %s", path);
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break;
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case S_IFLNK:
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new = read_blob_entry(ce, path, &size);
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if (!new)
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return error("git checkout-index: unable to read sha1 file of %s (%s)",
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path, sha1_to_hex(ce->sha1));
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if (to_tempfile || !has_symlinks) {
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if (to_tempfile) {
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strcpy(path, ".merge_link_XXXXXX");
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fd = mkstemp(path);
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} else
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fd = create_file(path, 0666);
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if (fd < 0) {
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free(new);
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return error("git checkout-index: unable to create "
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"file %s (%s)", path, strerror(errno));
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}
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wrote = write_in_full(fd, new, size);
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close(fd);
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free(new);
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if (wrote != size)
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return error("git checkout-index: unable to write file %s",
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path);
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} else {
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wrote = symlink(new, path);
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free(new);
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if (wrote)
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return error("git checkout-index: unable to create "
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"symlink %s (%s)", path, strerror(errno));
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}
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break;
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case S_IFGITLINK:
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if (to_tempfile)
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return error("git checkout-index: cannot create temporary subproject %s", path);
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if (mkdir(path, 0777) < 0)
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return error("git checkout-index: cannot create subproject directory %s", path);
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break;
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default:
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return error("git checkout-index: unknown file mode for %s", path);
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}
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if (state->refresh_cache) {
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struct stat st;
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lstat(ce->name, &st);
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fill_stat_cache_info(ce, &st);
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}
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return 0;
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}
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int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
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{
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static char path[PATH_MAX + 1];
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struct stat st;
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int len = state->base_dir_len;
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if (topath)
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return write_entry(ce, topath, state, 1);
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memcpy(path, state->base_dir, len);
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strcpy(path + len, ce->name);
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if (!lstat(path, &st)) {
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unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID);
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if (!changed)
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return 0;
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if (!state->force) {
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if (!state->quiet)
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fprintf(stderr, "git-checkout-index: %s already exists\n", path);
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return -1;
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}
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/*
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* We unlink the old file, to get the new one with the
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* right permissions (including umask, which is nasty
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* to emulate by hand - much easier to let the system
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* just do the right thing)
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*/
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if (S_ISDIR(st.st_mode)) {
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/* If it is a gitlink, leave it alone! */
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if (S_ISGITLINK(ce->ce_mode))
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return 0;
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if (!state->force)
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return error("%s is a directory", path);
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remove_subtree(path);
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} else if (unlink(path))
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return error("unable to unlink old '%s' (%s)", path, strerror(errno));
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} else if (state->not_new)
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return 0;
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create_directories(path, state);
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return write_entry(ce, path, state, 0);
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}
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