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/* ISC license. */
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <skalibs/bytestr.h>
#include <skalibs/strerr2.h>
#include <skalibs/stralloc.h>
#include <skalibs/djbunix.h>
#include <skalibs/direntry.h>
#include <skalibs/skamisc.h>
#define USAGE "s6-hiercopy src dst"
static void hiercopy (char const *, char const *) ;
static int filecopy (char const *src, char const *dst, mode_t mode)
{
int d ;
int s = open_readb(src) ;
if (s < 0) return 0 ;
d = open3(dst, O_WRONLY | O_CREAT | O_TRUNC, mode) ;
if (d < 0)
{
fd_close(s) ;
return 0 ;
}
if (fd_cat(s, d) < 0) goto err ;
fd_close(s) ;
fd_close(d) ;
return 1 ;
err:
{
register int e = errno ;
fd_close(s) ;
fd_close(d) ;
errno = e ;
}
return 0 ;
}
static int dircopy (char const *src, char const *dst, mode_t mode)
{
unsigned int tmpbase = satmp.len ;
unsigned int maxlen = 0 ;
{
DIR *dir = opendir(src) ;
if (!dir) return 0 ;
for (;;)
{
direntry *d ;
register unsigned int n ;
errno = 0 ;
d = readdir(dir) ;
if (!d) break ;
if (d->d_name[0] == '.')
if (((d->d_name[1] == '.') && !d->d_name[2]) || !d->d_name[1])
continue ;
n = str_len(d->d_name) ;
if (n > maxlen) maxlen = n ;
if (!stralloc_catb(&satmp, d->d_name, n+1)) break ;
}
if (errno)
{
int e = errno ;
dir_close(dir) ;
errno = e ;
goto err ;
}
dir_close(dir) ;
}
if (mkdir(dst, S_IRWXU) == -1)
{
struct stat st ;
if (errno != EEXIST) goto err ;
if (stat(dst, &st) < 0) goto err ;
if (!S_ISDIR(st.st_mode)) { errno = ENOTDIR ; goto err ; }
}
{
unsigned int srclen = str_len(src) ;
unsigned int dstlen = str_len(dst) ;
unsigned int i = tmpbase ;
char srcbuf[srclen + maxlen + 2] ;
char dstbuf[dstlen + maxlen + 2] ;
byte_copy(srcbuf, srclen, src) ;
byte_copy(dstbuf, dstlen, dst) ;
srcbuf[srclen] = '/' ;
dstbuf[dstlen] = '/' ;
while (i < satmp.len)
{
register unsigned int n = str_len(satmp.s + i) + 1 ;
byte_copy(srcbuf + srclen + 1, n, satmp.s + i) ;
byte_copy(dstbuf + dstlen + 1, n, satmp.s + i) ;
i += n ;
hiercopy(srcbuf, dstbuf) ;
}
}
if (chmod(dst, mode) == -1) goto err ;
satmp.len = tmpbase ;
return 1 ;
err:
satmp.len = tmpbase ;
return 0 ;
}
static void hiercopy (char const *src, char const *dst)
{
struct stat st ;
if (lstat(src, &st) == -1) strerr_diefu2sys(111, "stat ", src) ;
if (S_ISREG(st.st_mode))
{
if (!filecopy(src, dst, st.st_mode))
strerr_diefu4sys(111, "copy regular file ", src, " to ", dst) ;
}
else if (S_ISDIR(st.st_mode))
{
if (!dircopy(src, dst, st.st_mode))
strerr_diefu4sys(111, "recursively copy directory ", src, " to ", dst) ;
}
else if (S_ISFIFO(st.st_mode))
{
if (mkfifo(dst, st.st_mode) < 0)
strerr_diefu2sys(111, "mkfifo ", dst) ;
}
else if (S_ISLNK(st.st_mode))
{
unsigned int tmpbase = satmp.len ;
if ((sareadlink(&satmp, src) < 0) || !stralloc_0(&satmp))
strerr_diefu2sys(111, "readlink ", src) ;
if (symlink(satmp.s + tmpbase, dst) < 0)
strerr_diefu4sys(111, "symlink ", satmp.s + tmpbase, " to ", dst) ;
satmp.len = tmpbase ;
}
else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode) || S_ISSOCK(st.st_mode))
{
if (mknod(dst, st.st_mode, st.st_rdev) < 0)
strerr_diefu2sys(111, "mknod ", dst) ;
}
else strerr_dief2x(111, "unrecognized file type for ", src) ;
lchown(dst, st.st_uid, st.st_gid) ;
if (!S_ISLNK(st.st_mode)) chmod(dst, st.st_mode) ;
}
int main (int argc, char const *const *argv)
{
PROG = "s6-hiercopy" ;
if (argc < 3) strerr_dieusage(100, USAGE) ;
umask(0) ;
hiercopy(argv[1], argv[2]) ;
return 0 ;
}
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