diff options
Diffstat (limited to 'entry.c')
| -rw-r--r-- | entry.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/entry.c b/entry.c new file mode 100644 index 000000000..aa2ee46a8 --- /dev/null +++ b/entry.c @@ -0,0 +1,234 @@ +#include "cache.h" +#include "blob.h" + +static void create_directories(const char *path, const struct checkout *state) +{ + int len = strlen(path); + char *buf = xmalloc(len + 1); + const char *slash = path; + + while ((slash = strchr(slash+1, '/')) != NULL) { + struct stat st; + int stat_status; + + len = slash - path; + memcpy(buf, path, len); + buf[len] = 0; + + if (len <= state->base_dir_len) + /* + * checkout-index --prefix=<dir>; <dir> is + * allowed to be a symlink to an existing + * directory. + */ + stat_status = stat(buf, &st); + else + /* + * if there currently is a symlink, we would + * want to replace it with a real directory. + */ + stat_status = lstat(buf, &st); + + if (!stat_status && S_ISDIR(st.st_mode)) + continue; /* ok, it is already a directory. */ + + /* + * We know stat_status == 0 means something exists + * there and this mkdir would fail, but that is an + * error codepath; we do not care, as we unlink and + * mkdir again in such a case. + */ + if (mkdir(buf, 0777)) { + if (errno == EEXIST && state->force && + !unlink(buf) && !mkdir(buf, 0777)) + continue; + die("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("cannot opendir %s (%s)", path, strerror(errno)); + strcpy(pathbuf, path); + name = pathbuf + strlen(path); + *name++ = '/'; + while ((de = readdir(dir)) != NULL) { + struct stat st; + if ((de->d_name[0] == '.') && + ((de->d_name[1] == 0) || + ((de->d_name[1] == '.') && de->d_name[2] == 0))) + continue; + strcpy(name, de->d_name); + if (lstat(pathbuf, &st)) + die("cannot lstat %s (%s)", pathbuf, strerror(errno)); + if (S_ISDIR(st.st_mode)) + remove_subtree(pathbuf); + else if (unlink(pathbuf)) + die("cannot unlink %s (%s)", pathbuf, strerror(errno)); + } + closedir(dir); + if (rmdir(path)) + die("cannot rmdir %s (%s)", path, strerror(errno)); +} + +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, const char *path, 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) +{ + int fd; + long wrote; + + switch (ce->ce_mode & S_IFMT) { + char *new; + struct strbuf buf; + unsigned long size; + + case S_IFREG: + new = read_blob_entry(ce, path, &size); + if (!new) + return error("git checkout-index: unable to read sha1 file of %s (%s)", + path, sha1_to_hex(ce->sha1)); + + /* + * Convert from git internal format to working tree format + */ + strbuf_init(&buf, 0); + if (convert_to_working_tree(ce->name, new, size, &buf)) { + size_t newsize = 0; + free(new); + new = strbuf_detach(&buf, &newsize); + size = newsize; + } + + if (to_tempfile) { + strcpy(path, ".merge_file_XXXXXX"); + fd = mkstemp(path); + } else + fd = create_file(path, ce->ce_mode); + 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); + close(fd); + free(new); + if (wrote != size) + return error("git checkout-index: unable to write file %s", path); + break; + case S_IFLNK: + new = read_blob_entry(ce, path, &size); + if (!new) + return error("git checkout-index: unable to read sha1 file of %s (%s)", + path, sha1_to_hex(ce->sha1)); + if (to_tempfile || !has_symlinks) { + if (to_tempfile) { + strcpy(path, ".merge_link_XXXXXX"); + fd = mkstemp(path); + } 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); + close(fd); + free(new); + if (wrote != size) + return error("git checkout-index: unable to write file %s", + path); + } else { + wrote = symlink(new, path); + free(new); + if (wrote) + return error("git checkout-index: unable to create " + "symlink %s (%s)", path, strerror(errno)); + } + 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) { + struct stat st; + lstat(ce->name, &st); + fill_stat_cache_info(ce, &st); + } + return 0; +} + +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); + + if (!lstat(path, &st)) { + 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, state); + return write_entry(ce, path, state, 0); +} |