short i/o: fix calls to read to use xread or read_in_full
[git/git.git] / entry.c
CommitLineData
12dccc16 1#include "cache.h"
8e440259 2#include "blob.h"
12dccc16
LT
3
4static void create_directories(const char *path, struct checkout *state)
5{
6 int len = strlen(path);
7 char *buf = xmalloc(len + 1);
8 const char *slash = path;
9
10 while ((slash = strchr(slash+1, '/')) != NULL) {
11 len = slash - path;
12 memcpy(buf, path, len);
13 buf[len] = 0;
f312de01 14 if (mkdir(buf, 0777)) {
12dccc16
LT
15 if (errno == EEXIST) {
16 struct stat st;
f312de01 17 if (len > state->base_dir_len && state->force && !unlink(buf) && !mkdir(buf, 0777))
12dccc16
LT
18 continue;
19 if (!stat(buf, &st) && S_ISDIR(st.st_mode))
20 continue; /* ok */
21 }
22 die("cannot create directory at %s", buf);
23 }
24 }
25 free(buf);
26}
27
28static void remove_subtree(const char *path)
29{
30 DIR *dir = opendir(path);
31 struct dirent *de;
32 char pathbuf[PATH_MAX];
33 char *name;
34
35 if (!dir)
36 die("cannot opendir %s", path);
37 strcpy(pathbuf, path);
38 name = pathbuf + strlen(path);
39 *name++ = '/';
40 while ((de = readdir(dir)) != NULL) {
41 struct stat st;
42 if ((de->d_name[0] == '.') &&
43 ((de->d_name[1] == 0) ||
44 ((de->d_name[1] == '.') && de->d_name[2] == 0)))
45 continue;
46 strcpy(name, de->d_name);
47 if (lstat(pathbuf, &st))
48 die("cannot lstat %s", pathbuf);
49 if (S_ISDIR(st.st_mode))
50 remove_subtree(pathbuf);
51 else if (unlink(pathbuf))
52 die("cannot unlink %s", pathbuf);
53 }
54 closedir(dir);
55 if (rmdir(path))
56 die("cannot rmdir %s", path);
57}
58
d48a72f3 59static int create_file(const char *path, unsigned int mode)
12dccc16 60{
12dccc16 61 mode = (mode & 0100) ? 0777 : 0666;
781411ed 62 return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
12dccc16
LT
63}
64
de84f99c 65static int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
12dccc16
LT
66{
67 int fd;
68 void *new;
69 unsigned long size;
70 long wrote;
71 char type[20];
12dccc16
LT
72
73 new = read_sha1_file(ce->sha1, type, &size);
8e440259 74 if (!new || strcmp(type, blob_type)) {
12dccc16
LT
75 if (new)
76 free(new);
215a7ad1 77 return error("git-checkout-index: unable to read sha1 file of %s (%s)",
12dccc16
LT
78 path, sha1_to_hex(ce->sha1));
79 }
80 switch (ntohl(ce->ce_mode) & S_IFMT) {
81 case S_IFREG:
de84f99c
SP
82 if (to_tempfile) {
83 strcpy(path, ".merge_file_XXXXXX");
84 fd = mkstemp(path);
85 } else
86 fd = create_file(path, ntohl(ce->ce_mode));
12dccc16
LT
87 if (fd < 0) {
88 free(new);
215a7ad1 89 return error("git-checkout-index: unable to create file %s (%s)",
12dccc16
LT
90 path, strerror(errno));
91 }
92 wrote = write(fd, new, size);
93 close(fd);
94 free(new);
95 if (wrote != size)
215a7ad1 96 return error("git-checkout-index: unable to write file %s", path);
12dccc16
LT
97 break;
98 case S_IFLNK:
de84f99c
SP
99 if (to_tempfile) {
100 strcpy(path, ".merge_link_XXXXXX");
101 fd = mkstemp(path);
102 if (fd < 0) {
103 free(new);
104 return error("git-checkout-index: unable to create "
105 "file %s (%s)", path, strerror(errno));
106 }
107 wrote = write(fd, new, size);
108 close(fd);
109 free(new);
110 if (wrote != size)
111 return error("git-checkout-index: unable to write file %s",
112 path);
113 } else {
114 wrote = symlink(new, path);
12dccc16 115 free(new);
de84f99c
SP
116 if (wrote)
117 return error("git-checkout-index: unable to create "
118 "symlink %s (%s)", path, strerror(errno));
12dccc16 119 }
12dccc16
LT
120 break;
121 default:
122 free(new);
215a7ad1 123 return error("git-checkout-index: unknown file mode for %s", path);
12dccc16
LT
124 }
125
6ee67f26 126 if (state->refresh_cache) {
12dccc16
LT
127 struct stat st;
128 lstat(ce->name, &st);
129 fill_stat_cache_info(ce, &st);
130 }
131 return 0;
132}
133
de84f99c 134int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
12dccc16 135{
095c424d 136 static char path[PATH_MAX + 1];
de84f99c 137 struct stat st;
12dccc16
LT
138 int len = state->base_dir_len;
139
de84f99c
SP
140 if (topath)
141 return write_entry(ce, topath, state, 1);
142
12dccc16
LT
143 memcpy(path, state->base_dir, len);
144 strcpy(path + len, ce->name);
145
146 if (!lstat(path, &st)) {
5f73076c 147 unsigned changed = ce_match_stat(ce, &st, 1);
12dccc16
LT
148 if (!changed)
149 return 0;
150 if (!state->force) {
151 if (!state->quiet)
215a7ad1 152 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
4b12dae6 153 return -1;
12dccc16
LT
154 }
155
156 /*
157 * We unlink the old file, to get the new one with the
158 * right permissions (including umask, which is nasty
159 * to emulate by hand - much easier to let the system
160 * just do the right thing)
161 */
162 unlink(path);
d48a72f3
LT
163 if (S_ISDIR(st.st_mode)) {
164 if (!state->force)
165 return error("%s is a directory", path);
166 remove_subtree(path);
167 }
de84f99c 168 } else if (state->not_new)
12dccc16
LT
169 return 0;
170 create_directories(path, state);
de84f99c 171 return write_entry(ce, path, state, 0);
12dccc16 172}