1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/* vi: set sw=4 ts=4:
*
* cp.c - Copy files.
*
* Copyright 2008 Rob Landley <rob@landley.net>
*
* See http://www.opengroup.org/onlinepubs/009695399/utilities/cp.html
*
* "R+ra+d+p+r"
USE_CP(NEWTOY(cp, "<2vslrR+rdpa+d+p+rHLPif", TOYFLAG_BIN))
config CP
bool "cp (broken by dirtree changes)"
default n
help
usage: cp -fiprdal SOURCE... DEST
Copy files from SOURCE to DEST. If more than one SOURCE, DEST must
be a directory.
-f force copy by deleting destination file
-i interactive, prompt before overwriting existing DEST
-p preserve timestamps, ownership, and permissions
-r recurse into subdirectories (DEST must be a directory)
-d don't dereference symlinks
-a same as -dpr
-l hard link instead of copying
-v verbose
*/
#include "toys.h"
#define FLAG_f 1
#define FLAG_i 2
#define FLAG_P 4 // todo
#define FLAG_L 8 // todo
#define FLAG_H 16 // todo
#define FLAG_a 32
#define FLAG_p 64
#define FLAG_d 128 // todo
#define FLAG_R 256
#define FLAG_r 512
#define FLAG_l 1024 // todo
#define FLAG_s 2048 // todo
#define FLAG_v 4098
DEFINE_GLOBALS(
char *destname;
int destisdir;
int destisnew;
int keep_symlinks;
)
#define TT this.cp
// Copy an individual file or directory to target.
void cp_file(char *src, char *dst, struct stat *srcst)
{
int fdout = -1;
// -i flag is specified and dst file exists.
if ((toys.optflags&FLAG_i) && !access(dst, R_OK)
&& !yesno("cp: overwrite", 1))
return;
if (toys.optflags & FLAG_v)
printf("'%s' -> '%s'\n", src, dst);
// Copy directory or file to destination.
if (S_ISDIR(srcst->st_mode)) {
struct stat st2;
// Always make directory writeable to us, so we can create files in it.
//
// Yes, there's a race window between mkdir() and open() so it's
// possible that -p can be made to chown a directory other than the one
// we created. The closest we can do to closing this is make sure
// that what we open _is_ a directory rather than something else.
if ((mkdir(dst, srcst->st_mode | 0200) && errno != EEXIST)
|| 0>(fdout=open(dst, 0)) || fstat(fdout, &st2)
|| !S_ISDIR(st2.st_mode))
{
perror_exit("mkdir '%s'", dst);
}
} else if (TT.keep_symlinks && S_ISLNK(srcst->st_mode)) {
char *link = xreadlink(src);
// Note: -p currently has no effect on symlinks. How do you get a
// filehandle to them? O_NOFOLLOW causes the open to fail.
if (!link || symlink(link, dst)) perror_msg("link '%s'", dst);
free(link);
return;
} else if (toys.optflags & FLAG_l) {
if (link(src, dst)) perror_msg("link '%s'");
return;
} else {
int fdin, i;
fdin = xopen(src, O_RDONLY);
for (i=2 ; i; i--) {
fdout = open(dst, O_RDWR|O_CREAT|O_TRUNC, srcst->st_mode);
if (fdout>=0 || !(toys.optflags & FLAG_f)) break;
unlink(dst);
}
if (fdout<0) perror_exit("%s", dst);
xsendfile(fdin, fdout);
close(fdin);
}
// Inability to set these isn't fatal, some require root access.
// Can't do fchmod() etc here because -p works on mkdir, too.
if (toys.optflags & FLAG_p) {
int mask = umask(0);
struct utimbuf ut;
(void) fchown(fdout,srcst->st_uid, srcst->st_gid);
ut.actime = srcst->st_atime;
ut.modtime = srcst->st_mtime;
utime(dst, &ut);
umask(mask);
}
xclose(fdout);
}
// Callback from dirtree_read() for each file/directory under a source dir.
int cp_node(struct dirtree *node)
{
char *path = dirtree_path(node, 0); // TODO: use openat() instead
char *s = path+strlen(path);
struct dirtree *n;
// Find appropriate chunk of path for destination.
n = node;
if (!TT.destisdir) n = n->parent;
for (;;n = n->parent) {
while (s!=path) {
if (*(--s)=='/') break;
}
if (!n) break;
}
if (s != path) s++;
s = xmsprintf("%s/%s", TT.destname, s);
cp_file(path, s, &(node->st));
free(s);
free(path); // redo this whole darn function.
return 0;
}
void cp_main(void)
{
struct stat st;
int i;
// Grab target argument. (Guaranteed to be there due to "<2" above.)
TT.destname = toys.optargs[--toys.optc];
// If destination doesn't exist, are we ok with that?
if (stat(TT.destname, &st)) {
if (toys.optc>1) goto error_notdir;
TT.destisnew++;
// If destination exists...
} else {
if (S_ISDIR(st.st_mode)) TT.destisdir++;
else if (toys.optc > 1) goto error_notdir;
}
// Handle sources
for (i=0; i<toys.optc; i++) {
char *src = toys.optargs[i];
char *dst;
// Skip src==dest (TODO check inodes to catch "cp blah ./blah").
if (!strcmp(src, TT.destname)) continue;
// Skip nonexistent sources.
TT.keep_symlinks = toys.optflags & FLAG_d;
if (TT.keep_symlinks ? lstat(src, &st) : stat(src, &st))
{
perror_msg("'%s'", src);
toys.exitval = 1;
continue;
}
// Copy directory or file.
if (TT.destisdir) {
dst = strrchr(src, '/');
if (dst) dst++;
else dst=src;
dst = xmsprintf("%s/%s", TT.destname, dst);
} else dst = TT.destname;
if (S_ISDIR(st.st_mode)) {
if (toys.optflags & FLAG_r) {
cp_file(src, dst, &st);
TT.keep_symlinks++;
strncpy(toybuf, src, sizeof(toybuf)-1);
toybuf[sizeof(toybuf)-1]=0;
dirtree_read(toybuf, cp_node);
} else error_msg("Skipped dir '%s'", src);
} else cp_file(src, dst, &st);
if (TT.destisdir) free(dst);
}
return;
error_notdir:
error_exit("'%s' isn't a directory", TT.destname);
}
|
