Make fiel checkout function available to the git library
The merge stuff will want it soon, and we don't want to
duplicate all the work..
diff --git a/entry.c b/entry.c
new file mode 100644
index 0000000..d7824c4
--- /dev/null
+++ b/entry.c
@@ -0,0 +1,160 @@
+#include <sys/types.h>
+#include <dirent.h>
+#include "cache.h"
+
+static void create_directories(const char *path, struct checkout *state)
+{
+ int len = strlen(path);
+ char *buf = xmalloc(len + 1);
+ const char *slash = path;
+
+ while ((slash = strchr(slash+1, '/')) != NULL) {
+ len = slash - path;
+ memcpy(buf, path, len);
+ buf[len] = 0;
+ if (mkdir(buf, 0755)) {
+ if (errno == EEXIST) {
+ struct stat st;
+ if (len > state->base_dir_len && state->force && !unlink(buf) && !mkdir(buf, 0755))
+ continue;
+ if (!stat(buf, &st) && S_ISDIR(st.st_mode))
+ continue; /* ok */
+ }
+ 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", path);
+ 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", pathbuf);
+ if (S_ISDIR(st.st_mode))
+ remove_subtree(pathbuf);
+ else if (unlink(pathbuf))
+ die("cannot unlink %s", pathbuf);
+ }
+ closedir(dir);
+ if (rmdir(path))
+ die("cannot rmdir %s", path);
+}
+
+static int create_file(const char *path, unsigned int mode, int force)
+{
+ int fd;
+
+ mode = (mode & 0100) ? 0777 : 0666;
+ fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
+ if (fd < 0) {
+ if (errno == EISDIR && force) {
+ remove_subtree(path);
+ fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
+ }
+ }
+ return fd;
+}
+
+static int write_entry(struct cache_entry *ce, const char *path, struct checkout *state)
+{
+ int fd;
+ void *new;
+ unsigned long size;
+ long wrote;
+ char type[20];
+ char target[1024];
+
+ new = read_sha1_file(ce->sha1, type, &size);
+ if (!new || strcmp(type, "blob")) {
+ if (new)
+ free(new);
+ return error("git-checkout-cache: unable to read sha1 file of %s (%s)",
+ path, sha1_to_hex(ce->sha1));
+ }
+ switch (ntohl(ce->ce_mode) & S_IFMT) {
+ case S_IFREG:
+ fd = create_file(path, ntohl(ce->ce_mode), state->force);
+ if (fd < 0) {
+ free(new);
+ return error("git-checkout-cache: unable to create file %s (%s)",
+ path, strerror(errno));
+ }
+ wrote = write(fd, new, size);
+ close(fd);
+ free(new);
+ if (wrote != size)
+ return error("git-checkout-cache: unable to write file %s", path);
+ break;
+ case S_IFLNK:
+ memcpy(target, new, size);
+ target[size] = '\0';
+ if (symlink(target, path)) {
+ free(new);
+ return error("git-checkout-cache: unable to create symlink %s (%s)",
+ path, strerror(errno));
+ }
+ free(new);
+ break;
+ default:
+ free(new);
+ return error("git-checkout-cache: unknown file mode for %s", path);
+ }
+
+ if (state->update) {
+ struct stat st;
+ lstat(ce->name, &st);
+ fill_stat_cache_info(ce, &st);
+ }
+ return 0;
+}
+
+int checkout_entry(struct cache_entry *ce, struct checkout *state)
+{
+ struct stat st;
+ static char path[MAXPATHLEN+1];
+ int len = state->base_dir_len;
+
+ memcpy(path, state->base_dir, len);
+ strcpy(path + len, ce->name);
+
+ if (!lstat(path, &st)) {
+ unsigned changed = ce_match_stat(ce, &st);
+ if (!changed)
+ return 0;
+ if (!state->force) {
+ if (!state->quiet)
+ fprintf(stderr, "git-checkout-cache: %s already exists\n", path);
+ return 0;
+ }
+
+ /*
+ * 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)
+ */
+ unlink(path);
+ } else if (state->not_new)
+ return 0;
+ create_directories(path, state);
+ return write_entry(ce, path, state);
+}
+
+
