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
|
/* Copyright 2008 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/cp.html
*
* TODO: sHLP
USE_CP(NEWTOY(cp, "<2"USE_CP_MORE("rdavsln")"RHLPfip[-ni]", TOYFLAG_BIN))
config CP
bool "cp"
default y
help
usage: cp [-fipRHLP] 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)
-H Follow symlinks listed on command line
-L Follow all symlinks
-P Do not follow symlinks [default]
config CP_MORE
bool "cp -rdavsl options"
default y
depends on CP
help
usage: cp [-rdavsl]
-a same as -dpr
-d don't dereference symlinks
-l hard link instead of copy
-n no clobber (don't overwrite DEST)
-r synonym for -R
-s symlink instead of copy
-v verbose
*/
#define FOR_cp
#include "toys.h"
// TODO: PLHlsd
GLOBALS(
char *destname;
struct stat top;
)
// Callback from dirtree_read() for each file/directory under a source dir.
int cp_node(struct dirtree *try)
{
int fdout, cfd = try->parent ? try->parent->extra : AT_FDCWD,
tfd = dirtree_parentfd(try);
unsigned flags = toys.optflags;
char *catch = try->parent ? try->name : TT.destname, *err = "%s";
struct stat cst;
if (!dirtree_notdotdot(try)) return 0;
// If returning from COMEAGAIN, jump straight to -p logic at end.
if (S_ISDIR(try->st.st_mode) && try->data == -1) {
fdout = try->extra;
err = 0;
goto dashp;
}
// -d is only the same as -r for symlinks, not for directories
if (S_ISLNK(try->st.st_mode) & (flags & FLAG_d)) flags |= FLAG_r;
// Detect recursive copies via repeated top node (cp -R .. .) or
// identical source/target (fun with hardlinks).
if ((TT.top.st_dev == try->st.st_dev && TT.top.st_ino == try->st.st_ino
&& (catch = TT.destname))
|| (!fstatat(cfd, catch, &cst, 0) && cst.st_dev == try->st.st_dev
&& cst.st_ino == try->st.st_ino))
{
char *s = dirtree_path(try, 0);
error_msg("'%s' is '%s'", catch, s);
free(s);
return 0;
}
// Handle -inv
if ((flags & (FLAG_i|FLAG_n)) && !faccessat(cfd, catch, R_OK, 0))
if ((flags & FLAG_n) || !yesno("cp: overwrite", 1)) return 0;
if (flags & FLAG_v) {
char *s = dirtree_path(try, 0);
printf("cp '%s'\n", s);
free(s);
}
// Copy directory or file to destination.
if (S_ISDIR(try->st.st_mode)) {
struct stat st2;
if (!(flags & (FLAG_a|FLAG_r|FLAG_R))) {
err = "Skipped dir '%s'";
catch = try->name;
// 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.
} else if ((mkdirat(cfd, catch, try->st.st_mode | 0200) && errno != EEXIST)
|| 0>(try->extra = openat(cfd, catch, 0)) || fstat(try->extra, &st2)
|| !S_ISDIR(st2.st_mode));
else return DIRTREE_COMEAGAIN;
} else if (flags & FLAG_l) {
if (!linkat(tfd, try->name, cfd, catch, 0)) err = 0;
} else if ((try->parent || (flags & (FLAG_a|FLAG_r)))
&& !S_ISREG(try->st.st_mode))
{
if (S_ISLNK(try->st.st_mode)) {
int i = readlinkat(tfd, try->name, toybuf, sizeof(toybuf));
if (i > 0 && i < sizeof(toybuf) && !symlinkat(toybuf, cfd, catch))
err = 0;
} else if (!mknodat(cfd, catch, try->st.st_mode, try->st.st_dev)) err = 0;
} else {
int fdin, i;
fdin = openat(tfd, try->name, O_RDONLY);
if (fdin < 0) catch = try->name;
else {
for (i=2 ; i; i--) {
fdout = openat(cfd, catch, O_RDWR|O_CREAT|O_TRUNC, try->st.st_mode);
if (fdout>=0 || !(flags & FLAG_f)) break;
unlinkat(cfd, catch, 0);
}
if (fdout >= 0) {
xsendfile(fdin, fdout);
err = 0;
}
close(fdin);
}
dashp:
if (!(flags & FLAG_l) && (flags & (FLAG_a|FLAG_p))) {
struct timespec times[2];
// Inability to set these isn't fatal, some require root access.
fchown(fdout, try->st.st_uid, try->st.st_gid);
times[0] = try->st.st_atim;
times[1] = try->st.st_mtim;
futimens(fdout, times);
fchmod(fdout, try->st.st_mode);
}
xclose(fdout);
}
if (err) perror_msg(err, catch);
return 0;
}
void cp_main(void)
{
char *destname = toys.optargs[--toys.optc];
int i, destdir = !stat(destname, &TT.top) && S_ISDIR(TT.top.st_mode);
if (toys.optc>1 && !destdir) error_exit("'%s' not directory", destname);
// Loop through sources
for (i=0; i<toys.optc; i++) {
struct dirtree *new;
char *src = toys.optargs[i];
// Skip nonexistent sources
if (!(new = dirtree_add_node(0, src, !(toys.optflags & (FLAG_d|FLAG_a)))))
perror_msg("bad '%s'", src);
else {
if (destdir) TT.destname = xmsprintf("%s/%s", destname, basename(src));
else TT.destname = destname;
dirtree_handle_callback(new, cp_node);
if (destdir) free(TT.destname);
}
}
}
|
