sbase/libutil/cp.c
Michael Forney f4b9b966cf cp: Default to -P when -R is specified
POSIX only specifies the -H, -L, and -P options for use with -R, and
the default is left to the implementation. Without -R, symlinks must
be followed.

Most implementations use -P as the default with -R, which makes sense
to me as default behavior (the source and destination trees are the same).

Since we use the same code for -R and without it, and we allow -H, -L,
and -P without -R, set the default based on the presence of -R. Without
it, use -L as before, as required by POSIX, and with it, use -P to match
the behavior of other implementations.
2019-12-21 21:26:19 -08:00

177 lines
3.7 KiB
C

/* See LICENSE file for copyright and license details. */
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <utime.h>
#include "../fs.h"
#include "../util.h"
int cp_aflag = 0;
int cp_fflag = 0;
int cp_pflag = 0;
int cp_rflag = 0;
int cp_vflag = 0;
int cp_status = 0;
int cp_follow;
int
cp(const char *s1, const char *s2, int depth)
{
DIR *dp;
int f1, f2;
struct dirent *d;
struct stat st;
struct timespec times[2];
ssize_t r;
int (*statf)(const char *, struct stat *);
char target[PATH_MAX], ns1[PATH_MAX], ns2[PATH_MAX], *statf_name;
if (cp_follow == 'P' || (cp_follow == 'H' && depth)) {
statf_name = "lstat";
statf = lstat;
} else {
statf_name = "stat";
statf = stat;
}
if (statf(s1, &st) < 0) {
weprintf("%s %s:", statf_name, s1);
cp_status = 1;
return 0;
}
if (cp_vflag)
printf("%s -> %s\n", s1, s2);
if (S_ISLNK(st.st_mode)) {
if ((r = readlink(s1, target, sizeof(target) - 1)) >= 0) {
target[r] = '\0';
if (cp_fflag && unlink(s2) < 0 && errno != ENOENT) {
weprintf("unlink %s:", s2);
cp_status = 1;
return 0;
} else if (symlink(target, s2) < 0) {
weprintf("symlink %s -> %s:", s2, target);
cp_status = 1;
return 0;
}
}
} else if (S_ISDIR(st.st_mode)) {
if (!cp_rflag) {
weprintf("%s is a directory\n", s1);
cp_status = 1;
return 0;
}
if (!(dp = opendir(s1))) {
weprintf("opendir %s:", s1);
cp_status = 1;
return 0;
}
if (mkdir(s2, st.st_mode) < 0 && errno != EEXIST) {
weprintf("mkdir %s:", s2);
cp_status = 1;
closedir(dp);
return 0;
}
while ((d = readdir(dp))) {
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
estrlcpy(ns1, s1, sizeof(ns1));
if (s1[strlen(s1) - 1] != '/')
estrlcat(ns1, "/", sizeof(ns1));
estrlcat(ns1, d->d_name, sizeof(ns1));
estrlcpy(ns2, s2, sizeof(ns2));
if (s2[strlen(s2) - 1] != '/')
estrlcat(ns2, "/", sizeof(ns2));
estrlcat(ns2, d->d_name, sizeof(ns2));
fnck(ns1, ns2, cp, depth + 1);
}
closedir(dp);
} else if (cp_aflag && (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode) ||
S_ISSOCK(st.st_mode) || S_ISFIFO(st.st_mode))) {
if (cp_fflag && unlink(s2) < 0 && errno != ENOENT) {
weprintf("unlink %s:", s2);
cp_status = 1;
return 0;
} else if (mknod(s2, st.st_mode, st.st_rdev) < 0) {
weprintf("mknod %s:", s2);
cp_status = 1;
return 0;
}
} else {
if ((f1 = open(s1, O_RDONLY)) < 0) {
weprintf("open %s:", s1);
cp_status = 1;
return 0;
}
if ((f2 = creat(s2, st.st_mode)) < 0 && cp_fflag) {
if (unlink(s2) < 0 && errno != ENOENT) {
weprintf("unlink %s:", s2);
cp_status = 1;
close(f1);
return 0;
}
f2 = creat(s2, st.st_mode);
}
if (f2 < 0) {
weprintf("creat %s:", s2);
cp_status = 1;
close(f1);
return 0;
}
if (concat(f1, s1, f2, s2) < 0) {
cp_status = 1;
close(f1);
close(f2);
return 0;
}
close(f1);
close(f2);
}
if (cp_aflag || cp_pflag) {
/* atime and mtime */
times[0] = st.st_atim;
times[1] = st.st_mtim;
if (utimensat(AT_FDCWD, s2, times, AT_SYMLINK_NOFOLLOW) < 0) {
weprintf("utimensat %s:", s2);
cp_status = 1;
}
/* owner and mode */
if (!S_ISLNK(st.st_mode)) {
if (chown(s2, st.st_uid, st.st_gid) < 0) {
weprintf("chown %s:", s2);
cp_status = 1;
st.st_mode &= ~(S_ISUID | S_ISGID);
}
if (chmod(s2, st.st_mode) < 0) {
weprintf("chmod %s:", s2);
cp_status = 1;
}
} else {
if (lchown(s2, st.st_uid, st.st_gid) < 0) {
weprintf("lchown %s:", s2);
cp_status = 1;
return 0;
}
}
}
return 0;
}