diff options
Diffstat (limited to 'entry.c')
| -rw-r--r-- | entry.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/entry.c b/entry.c new file mode 100644 index 0000000000..06d24f14c6 --- /dev/null +++ b/entry.c @@ -0,0 +1,237 @@ +#include "cache.h" +#include "blob.h" +#include "dir.h" + +static void create_directories(const char *path, int path_len, + const struct checkout *state) +{ + char *buf = xmalloc(path_len + 1); + int len = 0; + + while (len < path_len) { + do { + buf[len] = path[len]; + len++; + } while (len < path_len && path[len] != '/'); + if (len >= path_len) + break; + buf[len] = 0; + + /* + * For 'checkout-index --prefix=<dir>', <dir> is + * allowed to be a symlink to an existing directory, + * and we set 'state->base_dir_len' below, such that + * we test the path components of the prefix with the + * stat() function instead of the lstat() function. + */ + if (has_dirs_only_path(buf, len, state->base_dir_len)) + continue; /* ok, it is already a directory. */ + + /* + * If this mkdir() would fail, it could be that there + * is already a symlink or something else exists + * there, therefore we then try to unlink it and try + * one more time to create the directory. + */ + if (mkdir(buf, 0777)) { + if (errno == EEXIST && state->force && + !unlink_or_warn(buf) && !mkdir(buf, 0777)) + continue; + die_errno("cannot create directory at '%s'", buf); + } + } + free(buf); +} + +static void remove_subtree(const char *path) +{ + DIR *dir = opendir(path); + struct dirent *de; + char pathbuf[PATH_MAX]; + char *name; + + if (!dir) + die_errno("cannot opendir '%s'", path); + strcpy(pathbuf, path); + name = pathbuf + strlen(path); + *name++ = '/'; + while ((de = readdir(dir)) != NULL) { + struct stat st; + if (is_dot_or_dotdot(de->d_name)) + continue; + strcpy(name, de->d_name); + if (lstat(pathbuf, &st)) + die_errno("cannot lstat '%s'", pathbuf); + if (S_ISDIR(st.st_mode)) + remove_subtree(pathbuf); + else if (unlink(pathbuf)) + die_errno("cannot unlink '%s'", pathbuf); + } + closedir(dir); + if (rmdir(path)) + die_errno("cannot rmdir '%s'", path); +} + +static int create_file(const char *path, unsigned int mode) +{ + mode = (mode & 0100) ? 0777 : 0666; + return open(path, O_WRONLY | O_CREAT | O_EXCL, mode); +} + +static void *read_blob_entry(struct cache_entry *ce, unsigned long *size) +{ + enum object_type type; + void *new = read_sha1_file(ce->sha1, &type, size); + + if (new) { + if (type == OBJ_BLOB) + return new; + free(new); + } + return NULL; +} + +static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile) +{ + unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT; + int fd, ret, fstat_done = 0; + char *new; + struct strbuf buf = STRBUF_INIT; + unsigned long size; + size_t wrote, newsize = 0; + struct stat st; + + switch (ce_mode_s_ifmt) { + case S_IFREG: + case S_IFLNK: + new = read_blob_entry(ce, &size); + if (!new) + return error("git checkout-index: unable to read sha1 file of %s (%s)", + path, sha1_to_hex(ce->sha1)); + + if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) { + ret = symlink(new, path); + free(new); + if (ret) + return error("git checkout-index: unable to create symlink %s (%s)", + path, strerror(errno)); + break; + } + + /* + * Convert from git internal format to working tree format + */ + if (ce_mode_s_ifmt == S_IFREG && + convert_to_working_tree(ce->name, new, size, &buf)) { + free(new); + new = strbuf_detach(&buf, &newsize); + size = newsize; + } + + if (to_tempfile) { + if (ce_mode_s_ifmt == S_IFREG) + strcpy(path, ".merge_file_XXXXXX"); + else + strcpy(path, ".merge_link_XXXXXX"); + fd = mkstemp(path); + } else if (ce_mode_s_ifmt == S_IFREG) { + fd = create_file(path, ce->ce_mode); + } else { + fd = create_file(path, 0666); + } + if (fd < 0) { + free(new); + return error("git checkout-index: unable to create file %s (%s)", + path, strerror(errno)); + } + + wrote = write_in_full(fd, new, size); + /* use fstat() only when path == ce->name */ + if (fstat_is_reliable() && + state->refresh_cache && !to_tempfile && !state->base_dir_len) { + fstat(fd, &st); + fstat_done = 1; + } + close(fd); + free(new); + if (wrote != size) + return error("git checkout-index: unable to write file %s", path); + break; + case S_IFGITLINK: + if (to_tempfile) + return error("git checkout-index: cannot create temporary subproject %s", path); + if (mkdir(path, 0777) < 0) + return error("git checkout-index: cannot create subproject directory %s", path); + break; + default: + return error("git checkout-index: unknown file mode for %s", path); + } + + if (state->refresh_cache) { + if (!fstat_done) + lstat(ce->name, &st); + fill_stat_cache_info(ce, &st); + } + return 0; +} + +/* + * This is like 'lstat()', except it refuses to follow symlinks + * in the path, after skipping "skiplen". + */ +int check_path(const char *path, int len, struct stat *st, int skiplen) +{ + const char *slash = path + len; + + while (path < slash && *slash != '/') + slash--; + if (!has_dirs_only_path(path, slash - path, skiplen)) { + errno = ENOENT; + return -1; + } + return lstat(path, st); +} + +int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath) +{ + static char path[PATH_MAX + 1]; + struct stat st; + int len = state->base_dir_len; + + if (topath) + return write_entry(ce, topath, state, 1); + + memcpy(path, state->base_dir, len); + strcpy(path + len, ce->name); + len += ce_namelen(ce); + + if (!check_path(path, len, &st, state->base_dir_len)) { + unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID); + if (!changed) + return 0; + if (!state->force) { + if (!state->quiet) + fprintf(stderr, "git-checkout-index: %s already exists\n", path); + return -1; + } + + /* + * We unlink the old file, to get the new one with the + * right permissions (including umask, which is nasty + * to emulate by hand - much easier to let the system + * just do the right thing) + */ + if (S_ISDIR(st.st_mode)) { + /* If it is a gitlink, leave it alone! */ + if (S_ISGITLINK(ce->ce_mode)) + return 0; + if (!state->force) + return error("%s is a directory", path); + remove_subtree(path); + } else if (unlink(path)) + return error("unable to unlink old '%s' (%s)", path, strerror(errno)); + } else if (state->not_new) + return 0; + create_directories(path, len, state); + return write_entry(ce, path, state, 0); +} |