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https://github.com/git/git
synced 2024-08-28 20:20:07 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
The symlink case had never worked, and the file case was broken by the O_EXCL change because the error return changed from EISDIR to EEXIST. Fix both problems by just moving the test for an existing directory to a more logical place.
157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
#include <sys/types.h>
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#include <dirent.h>
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#include "cache.h"
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static void create_directories(const char *path, struct checkout *state)
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{
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int len = strlen(path);
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char *buf = xmalloc(len + 1);
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const char *slash = path;
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while ((slash = strchr(slash+1, '/')) != NULL) {
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len = slash - path;
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memcpy(buf, path, len);
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buf[len] = 0;
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if (mkdir(buf, 0777)) {
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if (errno == EEXIST) {
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struct stat st;
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if (len > state->base_dir_len && state->force && !unlink(buf) && !mkdir(buf, 0777))
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continue;
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if (!stat(buf, &st) && S_ISDIR(st.st_mode))
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continue; /* ok */
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}
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die("cannot create directory at %s", buf);
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}
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}
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free(buf);
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}
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static void remove_subtree(const char *path)
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{
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DIR *dir = opendir(path);
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struct dirent *de;
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char pathbuf[PATH_MAX];
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char *name;
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if (!dir)
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die("cannot opendir %s", path);
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strcpy(pathbuf, path);
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name = pathbuf + strlen(path);
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*name++ = '/';
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while ((de = readdir(dir)) != NULL) {
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struct stat st;
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if ((de->d_name[0] == '.') &&
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((de->d_name[1] == 0) ||
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((de->d_name[1] == '.') && de->d_name[2] == 0)))
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continue;
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strcpy(name, de->d_name);
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if (lstat(pathbuf, &st))
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die("cannot lstat %s", pathbuf);
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if (S_ISDIR(st.st_mode))
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remove_subtree(pathbuf);
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else if (unlink(pathbuf))
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die("cannot unlink %s", pathbuf);
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}
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closedir(dir);
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if (rmdir(path))
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die("cannot rmdir %s", path);
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}
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static int create_file(const char *path, unsigned int mode)
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{
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mode = (mode & 0100) ? 0777 : 0666;
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return open(path, O_WRONLY | O_TRUNC | O_CREAT | O_EXCL, mode);
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}
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static int write_entry(struct cache_entry *ce, const char *path, struct checkout *state)
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{
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int fd;
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void *new;
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unsigned long size;
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long wrote;
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char type[20];
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char target[1024];
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new = read_sha1_file(ce->sha1, type, &size);
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if (!new || strcmp(type, "blob")) {
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if (new)
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free(new);
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return error("git-checkout-cache: unable to read sha1 file of %s (%s)",
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path, sha1_to_hex(ce->sha1));
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}
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switch (ntohl(ce->ce_mode) & S_IFMT) {
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case S_IFREG:
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fd = create_file(path, ntohl(ce->ce_mode));
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if (fd < 0) {
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free(new);
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return error("git-checkout-cache: unable to create file %s (%s)",
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path, strerror(errno));
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}
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wrote = write(fd, new, size);
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close(fd);
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free(new);
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if (wrote != size)
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return error("git-checkout-cache: unable to write file %s", path);
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break;
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case S_IFLNK:
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memcpy(target, new, size);
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target[size] = '\0';
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if (symlink(target, path)) {
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free(new);
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return error("git-checkout-cache: unable to create symlink %s (%s)",
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path, strerror(errno));
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}
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free(new);
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break;
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default:
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free(new);
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return error("git-checkout-cache: unknown file mode for %s", path);
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}
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if (state->refresh_cache) {
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struct stat st;
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lstat(ce->name, &st);
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fill_stat_cache_info(ce, &st);
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}
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return 0;
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}
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int checkout_entry(struct cache_entry *ce, struct checkout *state)
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{
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struct stat st;
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static char path[MAXPATHLEN+1];
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int len = state->base_dir_len;
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memcpy(path, state->base_dir, len);
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strcpy(path + len, ce->name);
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if (!lstat(path, &st)) {
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unsigned changed = ce_match_stat(ce, &st);
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if (!changed)
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return 0;
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if (!state->force) {
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if (!state->quiet)
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fprintf(stderr, "git-checkout-cache: %s already exists\n", path);
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return 0;
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}
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/*
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* We unlink the old file, to get the new one with the
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* right permissions (including umask, which is nasty
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* to emulate by hand - much easier to let the system
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* just do the right thing)
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*/
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unlink(path);
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if (S_ISDIR(st.st_mode)) {
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if (!state->force)
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return error("%s is a directory", path);
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remove_subtree(path);
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}
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} else if (state->not_new)
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return 0;
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create_directories(path, state);
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return write_entry(ce, path, state);
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}
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