logic: tpax_archive_write(): initial implementation and integration.

1 files changed, 183 insertions, 2 deletions

diff --git a/src/logic/tpax_archive_write.c b/src/logic/tpax_archive_write.c
index b4dcf2a..272f9b9 100644
--- a/src/logic/tpax_archive_write.c
+++ b/src/logic/tpax_archive_write.c
@@ -9,6 +9,10 @@
 #include "tpax_errinfo_impl.h"
 #include "tpax_visibility_impl.h"
 
+#ifndef ssizeof
+#define ssizeof(x) (ssize_t)(sizeof(x))
+#endif
+
 static int tpax_archive_append_memory_data(
 	int                             fdout,
 	void *                          buf,
@@ -59,6 +63,185 @@ static int tpax_archive_append_pad(
 	return ret;
 }
 
+static int tpax_archive_write_ret(
+	int                     ret,
+	struct tpax_unit_ctx *  uctx)
+{
+	tpax_free_unit_ctx(uctx);
+	return ret;
+}
+
+static int tpax_archive_write_impl(
+	const struct tpax_driver_ctx *  dctx,
+	const struct tpax_dirent *      cdent,
+	int                             fdcwd,
+	int                             fdout)
+{
+	struct tpax_unit_ctx *          uctx;
+	struct tpax_ustar_header        uhdr;
+	const  char *                   path;
+	off_t                           hpos;
+	off_t                           dpos;
+	int                             fdtmp;
+	ssize_t                         nread;
+	ssize_t                         nbytes;
+	void *                          buf;
+	size_t                          buflen;
+	size_t                          cmplen;
+	void *				membuf;
+
+	/* full path */
+	if (!(path = tpax_queue_item_full_path(dctx,cdent)))
+		return TPAX_CUSTOM_ERROR(
+			dctx,
+			TPAX_ERR_FLOW_ERROR);
+
+	/* uctx */
+	if (tpax_get_unit_ctx(dctx,fdcwd,path,&uctx) < 0)
+		return TPAX_NESTED_ERROR(dctx);
+
+	/* record errors */
+	tpax_driver_set_ectx(
+		dctx,0,path);
+
+	/* header and data offsets: todo pax and cpio */
+	hpos = tpax_get_driver_cpos(dctx);
+	dpos = hpos + sizeof(uhdr);
+
+	/* header */
+	if (tpax_init_ustar_header(
+			dctx,path,uctx->st,
+			*uctx->link,&uhdr) < 0)
+		return tpax_archive_write_ret(
+			TPAX_NESTED_ERROR(dctx),
+			uctx);
+
+	/* buffer  */
+	membuf = 0;
+	fdtmp  = -1;
+
+	/* associated data? */
+	if S_ISREG(uctx->st->st_mode) {
+		buf = tpax_get_driver_anon_map_addr(
+			dctx,&buflen);
+
+		if (buflen >= (cmplen = uctx->st->st_size))
+			membuf = buf;
+
+		/* snapshot */
+		if (membuf) {
+			if (tpax_file_create_memory_snapshot(
+					dctx,fdcwd,path,
+					uctx->st,membuf) < 0)
+				return tpax_archive_write_ret(
+					TPAX_NESTED_ERROR(dctx),
+					uctx);
+		} else {
+			if ((fdtmp = tpax_file_create_tmpfs_snapshot(
+					dctx,fdcwd,path,
+					uctx->st)) < 0)
+				return tpax_archive_write_ret(
+					TPAX_NESTED_ERROR(dctx),
+					uctx);
+
+			if (lseek(fdtmp,0,SEEK_SET) < 0)
+				return tpax_archive_write_ret(
+					TPAX_SYSTEM_ERROR(dctx),
+					uctx);
+		}
+	}
+
+	/* append header */
+	if (tpax_archive_append_memory_data(fdout,&uhdr,ssizeof(uhdr)) < 0) {
+		if (fdtmp >= 0)
+			close(fdtmp);
+
+		return tpax_archive_write_ret(
+			TPAX_SYSTEM_ERROR(dctx),
+			uctx);
+	}
+
+	tpax_set_driver_cpos(dctx,dpos);
+
+	/* all done? */
+	if (!(S_ISREG(uctx->st->st_mode))) {
+		tpax_free_unit_ctx(uctx);
+		return 0;
+	}
+
+	/* append data from snapshot */
+	if (fdtmp >= 0) {
+		buf = tpax_get_driver_anon_map_addr(
+			dctx,&buflen);
+
+		for (nread=0; nread<uctx->st->st_size; ) {
+			nbytes = read(fdtmp,buf,buflen);
+
+			while ((nbytes < 0) && (errno == EINTR))
+				nbytes = read(fdtmp,buf,buflen);
+
+			if (nbytes < 0) {
+				close(fdtmp);
+				return tpax_archive_write_ret(
+					TPAX_SYSTEM_ERROR(dctx),
+					uctx);
+
+			} else if (nbytes == 0) {
+				close(fdtmp);
+				return tpax_archive_write_ret(
+					TPAX_CUSTOM_ERROR(dctx,TPAX_ERR_FLOW_ERROR),
+					uctx);
+
+			} else {
+				nread += nbytes;
+			}
+
+			if (tpax_archive_append_memory_data(fdout,buf,nbytes) < 0) {
+				close(fdtmp);
+				return tpax_archive_write_ret(
+					TPAX_SYSTEM_ERROR(dctx),
+					uctx);
+			}
+		}
+
+		close(fdtmp);
+	} else {
+		if (tpax_archive_append_memory_data(
+				fdout,membuf,
+				uctx->st->st_size) < 0)
+			return tpax_archive_write_ret(
+				TPAX_SYSTEM_ERROR(dctx),
+				uctx);
+	}
+
+	return tpax_archive_write_ret(
+		tpax_archive_append_pad(dctx,fdout,uctx->st),
+		uctx);
+}
+
+int tpax_archive_write(const struct tpax_driver_ctx * dctx)
+{
+	struct tpax_driver_ctx_impl *   ictx;
+	struct tpax_dirent **           direntv;
+	int                             fdcwd;
+	int                             fdout;
+
+	/* driver */
+	ictx  = tpax_get_driver_ictx(dctx);
+	fdcwd = tpax_driver_fdcwd(dctx);
+	fdout = tpax_driver_fdout(dctx);
+
+	/* quote to archive */
+	if (tpax_update_queue_vector(dctx) < 0)
+		return TPAX_NESTED_ERROR(dctx);
+
+	for (direntv=ictx->direntv; *direntv; direntv++)
+		if (tpax_archive_write_impl(dctx,*direntv,fdcwd,fdout) < 0)
+			return TPAX_NESTED_ERROR(dctx);
+
+	return 0;
+}
+
 int tpax_archive_seal(const struct tpax_driver_ctx * dctx)
 {
 	int     fdout;
@@ -98,7 +281,5 @@ int tpax_archive_seal(const struct tpax_driver_ctx * dctx)
 		tpax_set_driver_cpos(dctx,nwritten);
 	}
 
-	(void)tpax_archive_append_pad;
-
 	return 0;
 }