db: checksum installed files, protect config files

Checksum of installed is computed on the fly when extracting them
and it'll be saved to fdb. When installing config files those are
diverted with suffix .apk-new if earlier version of same file with
local changes exist.

1 files changed, 28 insertions, 17 deletions

diff --git a/src/io.c b/src/io.c
index 418c7f8..2bb8afc 100644
--- a/src/io.c
+++ b/src/io.c
@@ -47,22 +47,6 @@ static size_t fd_read(void *stream, void *ptr, size_t size)
 	return i;
 }
 
-static size_t fd_splice(void *stream, int fd, size_t size)
-{
-	struct apk_fd_istream *fis =
-		container_of(stream, struct apk_fd_istream, is);
-	size_t i = 0, r;
-
-	while (i != size) {
-		r = splice(fis->fd, NULL, fd, NULL, size - i, SPLICE_F_MOVE);
-		if (r == -1)
-			return i;
-		i += r;
-	}
-
-	return i;
-}
-
 static void fd_close(void *stream)
 {
 	struct apk_fd_istream *fis =
@@ -82,7 +66,6 @@ struct apk_istream *apk_istream_from_fd(int fd)
 
 	*fis = (struct apk_fd_istream) {
 		.is.read = fd_read,
-		.is.splice = fd_splice,
 		.is.close = fd_close,
 		.fd = fd,
 	};
@@ -322,3 +305,31 @@ apk_blob_t apk_blob_from_istream(struct apk_istream *is, size_t size)
 	return APK_BLOB_PTR_LEN(ptr, rsize);
 }
 
+int apk_file_get_info(const char *filename, struct apk_file_info *fi)
+{
+	struct stat st;
+	struct apk_bstream *bs;
+	int fd;
+
+	if (stat(filename, &st) != 0)
+		return -1;
+
+	*fi = (struct apk_file_info) {
+		.size = st.st_size,
+		.uid = st.st_uid,
+		.gid = st.st_gid,
+		.mode = st.st_mode,
+		.mtime = st.st_mtime,
+		.device = st.st_dev,
+	};
+
+	fd = open(filename, O_RDONLY);
+	if (fd < 0)
+		return 0;
+
+	bs = apk_bstream_from_fd(fd);
+	if (bs != NULL)
+		bs->close(bs, fi->csum);
+
+	return 0;
+}