diff options
Diffstat (limited to 'entry.c')
| -rw-r--r-- | entry.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/entry.c b/entry.c new file mode 100644 index 0000000000..d7824c4f61 --- /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); +} + + |