1#include "cache.h"
2#include "blob.h"
3#include "dir.h"
45
static void create_directories(const char *path, int path_len,
6const struct checkout *state)
7{
8char *buf = xmalloc(path_len + 1);
9int len = 0;
1011
while (len < path_len) {
12do {
13buf[len] = path[len];
14len++;
15} while (len < path_len && path[len] != '/');
16if (len >= path_len)
17break;
18buf[len] = 0;
1920
/*
21* For 'checkout-index --prefix=<dir>', <dir> is
22* allowed to be a symlink to an existing directory,
23* and we set 'state->base_dir_len' below, such that
24* we test the path components of the prefix with the
25* stat() function instead of the lstat() function.
26*/
27if (has_dirs_only_path(buf, len, state->base_dir_len))
28continue; /* ok, it is already a directory. */
2930
/*
31* If this mkdir() would fail, it could be that there
32* is already a symlink or something else exists
33* there, therefore we then try to unlink it and try
34* one more time to create the directory.
35*/
36if (mkdir(buf, 0777)) {
37if (errno == EEXIST && state->force &&
38!unlink(buf) && !mkdir(buf, 0777))
39continue;
40die("cannot create directory at %s", buf);
41}
42}
43free(buf);
44}
4546
static void remove_subtree(const char *path)
47{
48DIR *dir = opendir(path);
49struct dirent *de;
50char pathbuf[PATH_MAX];
51char *name;
5253
if (!dir)
54die("cannot opendir %s (%s)", path, strerror(errno));
55strcpy(pathbuf, path);
56name = pathbuf + strlen(path);
57*name++ = '/';
58while ((de = readdir(dir)) != NULL) {
59struct stat st;
60if (is_dot_or_dotdot(de->d_name))
61continue;
62strcpy(name, de->d_name);
63if (lstat(pathbuf, &st))
64die("cannot lstat %s (%s)", pathbuf, strerror(errno));
65if (S_ISDIR(st.st_mode))
66remove_subtree(pathbuf);
67else if (unlink(pathbuf))
68die("cannot unlink %s (%s)", pathbuf, strerror(errno));
69}
70closedir(dir);
71if (rmdir(path))
72die("cannot rmdir %s (%s)", path, strerror(errno));
73}
7475
static int create_file(const char *path, unsigned int mode)
76{
77mode = (mode & 0100) ? 0777 : 0666;
78return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
79}
8081
static void *read_blob_entry(struct cache_entry *ce, unsigned long *size)
82{
83enum object_type type;
84void *new = read_sha1_file(ce->sha1, &type, size);
8586
if (new) {
87if (type == OBJ_BLOB)
88return new;
89free(new);
90}
91return NULL;
92}
9394
static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
95{
96unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
97int fd, ret;
98char *new;
99struct strbuf buf = STRBUF_INIT;
100unsigned long size;
101size_t wrote, newsize = 0;
102103
switch (ce_mode_s_ifmt) {
104case S_IFREG:
105case S_IFLNK:
106new = read_blob_entry(ce, &size);
107if (!new)
108return error("git checkout-index: unable to read sha1 file of %s (%s)",
109path, sha1_to_hex(ce->sha1));
110111
if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
112ret = symlink(new, path);
113free(new);
114if (ret)
115return error("git checkout-index: unable to create symlink %s (%s)",
116path, strerror(errno));
117break;
118}
119120
/*
121* Convert from git internal format to working tree format
122*/
123if (ce_mode_s_ifmt == S_IFREG &&
124convert_to_working_tree(ce->name, new, size, &buf)) {
125free(new);
126new = strbuf_detach(&buf, &newsize);
127size = newsize;
128}
129130
if (to_tempfile) {
131if (ce_mode_s_ifmt == S_IFREG)
132strcpy(path, ".merge_file_XXXXXX");
133else
134strcpy(path, ".merge_link_XXXXXX");
135fd = mkstemp(path);
136} else if (ce_mode_s_ifmt == S_IFREG) {
137fd = create_file(path, ce->ce_mode);
138} else {
139fd = create_file(path, 0666);
140}
141if (fd < 0) {
142free(new);
143return error("git checkout-index: unable to create file %s (%s)",
144path, strerror(errno));
145}
146147
wrote = write_in_full(fd, new, size);
148close(fd);
149free(new);
150if (wrote != size)
151return error("git checkout-index: unable to write file %s", path);
152break;
153case S_IFGITLINK:
154if (to_tempfile)
155return error("git checkout-index: cannot create temporary subproject %s", path);
156if (mkdir(path, 0777) < 0)
157return error("git checkout-index: cannot create subproject directory %s", path);
158break;
159default:
160return error("git checkout-index: unknown file mode for %s", path);
161}
162163
if (state->refresh_cache) {
164struct stat st;
165lstat(ce->name, &st);
166fill_stat_cache_info(ce, &st);
167}
168return 0;
169}
170171
int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
172{
173static char path[PATH_MAX + 1];
174struct stat st;
175int len = state->base_dir_len;
176177
if (topath)
178return write_entry(ce, topath, state, 1);
179180
memcpy(path, state->base_dir, len);
181strcpy(path + len, ce->name);
182len += ce_namelen(ce);
183184
if (!lstat(path, &st)) {
185unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID);
186if (!changed)
187return 0;
188if (!state->force) {
189if (!state->quiet)
190fprintf(stderr, "git-checkout-index: %s already exists\n", path);
191return -1;
192}
193194
/*
195* We unlink the old file, to get the new one with the
196* right permissions (including umask, which is nasty
197* to emulate by hand - much easier to let the system
198* just do the right thing)
199*/
200if (S_ISDIR(st.st_mode)) {
201/* If it is a gitlink, leave it alone! */
202if (S_ISGITLINK(ce->ce_mode))
203return 0;
204if (!state->force)
205return error("%s is a directory", path);
206remove_subtree(path);
207} else if (unlink(path))
208return error("unable to unlink old '%s' (%s)", path, strerror(errno));
209} else if (state->not_new)
210return 0;
211create_directories(path, len, state);
212return write_entry(ce, path, state, 0);
213}