1 files changed, 156 insertions, 0 deletions
diff --git a/src/minutils/s6-hiercopy.c b/src/minutils/s6-hiercopy.c
new file mode 100644
index 0000000..f8b7666
--- /dev/null
+++ b/src/minutils/s6-hiercopy.c
@@ -0,0 +1,156 @@
+/* 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 ;
+}