Make fiel checkout function available to the git library

[git.git] / entry.c

diff --git a/entry.c b/entry.c
new file mode 100644 (file)
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);
+}
+
+