Documentation/hooks: add pre-auto-gc hook

diff --git a/copy.c b/copy.c
index 08a3d388a4c312fca18558b2b8e5dcf027c7afaf..afc4fbf41405d42d2751ea35ec7a9a32f8df6274 100644 (file)
--- a/copy.c
+++ b/copy.c
@@ -3,10 +3,9 @@
 int copy_fd(int ifd, int ofd)
 {
        while (1) {
-               int len;
                char buffer[8192];
                char *buf = buffer;
-               len = xread(ifd, buffer, sizeof(buffer));
+               ssize_t len = xread(ifd, buffer, sizeof(buffer));
                if (!len)
                        break;
                if (len < 0) {
@@ -36,3 +35,23 @@ int copy_fd(int ifd, int ofd)
        return 0;
 }
 
+int copy_file(const char *dst, const char *src, int mode)
+{
+       int fdi, fdo, status;
+
+       mode = (mode & 0111) ? 0777 : 0666;
+       if ((fdi = open(src, O_RDONLY)) < 0)
+               return fdi;
+       if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
+               close(fdi);
+               return fdo;
+       }
+       status = copy_fd(fdi, fdo);
+       if (close(fdo) != 0)
+               return error("%s: write error: %s", dst, strerror(errno));
+
+       if (!status && adjust_shared_perm(dst))
+               return -1;
+
+       return status;
+}