From 239ac5c3f246a737d7b70817319a37d6cece8a69 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: May 23 2020 05:59:02 +0000
Subject: driver: tpax_get_unit_ctx(): implemented the non-recursive bits.


---

diff --git a/include/tpax/tpax.h b/include/tpax/tpax.h
index 8c45468..a06a1e5 100644
--- a/include/tpax/tpax.h
+++ b/include/tpax/tpax.h
@@ -119,6 +119,10 @@ struct tpax_driver_ctx {
 
 struct tpax_unit_ctx {
 	const char * const *		path;
+	const char * const *		link;
+	const struct tpax_ustar_header *uhdr;
+	const struct tpax_cpio_header *	chdr;
+	const struct stat *		st;
 	void *				any;
 };
 
diff --git a/src/driver/tpax_unit_ctx.c b/src/driver/tpax_unit_ctx.c
index a6a91b6..a94bf05 100644
--- a/src/driver/tpax_unit_ctx.c
+++ b/src/driver/tpax_unit_ctx.c
@@ -8,11 +8,13 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/mman.h>
+#include <fcntl.h>
+#include <sys/stat.h>
 
 #include <tpax/tpax.h>
 #include "tpax_driver_impl.h"
 #include "tpax_errinfo_impl.h"
+#include "tpax_readlink_impl.h"
 
 static int tpax_free_unit_ctx_impl(struct tpax_unit_ctx_impl * ctx, int ret)
 {
@@ -28,6 +30,7 @@ int tpax_get_unit_ctx(
 	const char *			path,
 	struct tpax_unit_ctx **		pctx)
 {
+	int				ret;
 	struct tpax_unit_ctx_impl *	ctx;
 
 	if (!dctx)
@@ -40,8 +43,32 @@ int tpax_get_unit_ctx(
 	tpax_driver_set_ectx(
 		dctx,0,path);
 
+	if (dctx->cctx->drvflags & TPAX_DRIVER_EXEC_MODE_WRITE_COPY) {
+		ret = fstatat(
+			tpax_driver_fdcwd(dctx),path,
+			&ctx->st,AT_SYMLINK_NOFOLLOW);
+
+		if (ret < 0) {
+			free(ctx);
+			return TPAX_SYSTEM_ERROR(dctx);
+		}
+	}
+
+	if (S_ISLNK(ctx->st.st_mode)) {
+		if (tpax_readlink(
+				path,ctx->linkbuf,
+				sizeof(ctx->linkbuf)) < 0) {
+			free(ctx);
+			return TPAX_SYSTEM_ERROR(dctx);
+		}
+	}
+
 	ctx->path	= path;
+	ctx->link	= ctx->linkbuf;
+
 	ctx->uctx.path	= &ctx->path;
+	ctx->uctx.link	= &ctx->link;
+	ctx->uctx.st	= &ctx->st;
 
 	*pctx = &ctx->uctx;
 
diff --git a/src/internal/tpax_driver_impl.h b/src/internal/tpax_driver_impl.h
index 74af288..5f98415 100644
--- a/src/internal/tpax_driver_impl.h
+++ b/src/internal/tpax_driver_impl.h
@@ -9,14 +9,20 @@
 
 #include <stdint.h>
 #include <stdio.h>
+#include <sys/stat.h>
 #include <sys/types.h>
 
 #include <tpax/tpax.h>
+#include <tpax/tpax_specs.h>
 #include "tpax_dprintf_impl.h"
 #include "argv/argv.h"
 
 #define TPAX_OPTV_ELEMENTS 64
 
+#define TPAX_DRIVER_EXEC_MODE_WRITE_COPY \
+	(TPAX_DRIVER_EXEC_MODE_WRITE |    \
+	 TPAX_DRIVER_EXEC_MODE_COPY)
+
 extern const struct argv_option tpax_default_options[];
 
 enum app_tags {
@@ -47,6 +53,13 @@ struct tpax_driver_ctx_impl {
 struct tpax_unit_ctx_impl {
 	const char *		path;
 	struct tpax_unit_ctx	uctx;
+	struct stat		st;
+	const char *		link;
+	char			linkbuf[1024];
+	union {
+		struct tpax_ustar_header uhdr;
+		struct tpax_cpio_header  chdr;
+	} hdrbufs;
 };