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-rw-r--r--entry.c234
1 files changed, 234 insertions, 0 deletions
diff --git a/entry.c b/entry.c
new file mode 100644
index 0000000000..222aaa374b
--- /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);
+}