From: Michael Tremer <michael.tremer@ipfire.org>
Date: Tue, 22 Oct 2024 09:23:34 +0000 (+0000)
Subject: stripper: Identify source files
X-Git-Tag: 0.9.30~953
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=070eb9e91e36847c6b1583e1f5332d23f1802b80;p=pakfire.git

stripper: Identify source files

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/libpakfire/include/pakfire/stripper.h b/src/libpakfire/include/pakfire/stripper.h
index 84d9dff0a..dd30ced67 100644
--- a/src/libpakfire/include/pakfire/stripper.h
+++ b/src/libpakfire/include/pakfire/stripper.h
@@ -23,6 +23,9 @@
 
 #ifdef PAKFIRE_PRIVATE
 
+#define BUILD_SRC_DIR "/build/source"
+#define DEBUG_SRC_DIR "/usr/src/debug"
+
 struct pakfire_stripper;
 
 int pakfire_stripper_create(struct pakfire_stripper** stripper,
diff --git a/src/libpakfire/stripper.c b/src/libpakfire/stripper.c
index b8e9c84a5..cc73f5193 100644
--- a/src/libpakfire/stripper.c
+++ b/src/libpakfire/stripper.c
@@ -21,8 +21,12 @@
 #include <errno.h>
 #include <stdlib.h>
 
+// libdw
+#include <elfutils/libdw.h>
+
 #include <pakfire/filelist.h>
 #include <pakfire/pakfire.h>
+#include <pakfire/path.h>
 #include <pakfire/string.h>
 #include <pakfire/stripper.h>
 
@@ -147,6 +151,106 @@ ERROR:
 	return r;
 }
 
+static int pakfire_stripper_copy_source_file(
+		struct pakfire_stripper* stripper, const char* filename) {
+	printf("FILENAME = %s\n", filename);
+
+	return 0;
+}
+
+static int pakfire_stripper_copy_sources(
+		struct pakfire* pakfire, struct pakfire_file* file, void* data) {
+	struct pakfire_stripper* stripper = data;
+	const char* filename = NULL;
+	char basename[PATH_MAX];
+	Dwarf* dwarf = NULL;
+	Dwarf_Files* files = NULL;
+	Dwarf_Die* die = NULL;
+	Dwarf_Off offset = 0;
+	Dwarf_Off next_offset;
+	size_t cu_header_length;
+	Dwarf_Die die_mem;
+	size_t count;
+	FILE* f = NULL;
+	int r;
+
+	// Open the file
+	f = pakfire_file_open(file);
+	if (!f) {
+		r = -errno;
+		goto ERROR;
+	}
+
+	// Read DWARF information
+	dwarf = dwarf_begin(fileno(f), DWARF_C_READ);
+	if (!dwarf) {
+		CTX_ERROR(stripper->ctx, "Could not initialize DWARF context: %s\n",
+				dwarf_errmsg(-1));
+		r = -errno;
+		goto ERROR;
+	}
+
+	for (;;) {
+		// Fetch the next compilation unit
+		r = dwarf_nextcu(dwarf, offset, &next_offset, &cu_header_length, NULL, NULL, NULL);
+		if (r < 0)
+			goto ERROR;
+
+		// Fetch the Debug Information Entry
+		die = dwarf_offdie(dwarf, offset + cu_header_length, &die_mem);
+		if (!die)
+			break;
+
+		// Fetch the source files
+		r = dwarf_getsrcfiles(die, &files, &count);
+		if (r < 0) {
+			CTX_ERROR(stripper->ctx, "Could not fetch the source files: %s\n",
+					dwarf_errmsg(-1));
+			r = -errno;
+			goto ERROR;
+		}
+
+		// Iterate over all files...
+		for (unsigned int i = 0; i < count; i++) {
+			// Fetch the filename
+			filename = dwarf_filesrc(files, i, NULL, NULL);
+
+			// If the source file is not in the right path, we ignore it
+			if (!pakfire_string_startswith(filename, BUILD_SRC_DIR))
+				continue;
+
+			// Determine the basename
+			r = pakfire_path_basename(basename, filename);
+			if (r < 0)
+				goto ERROR;
+
+			// Ignore things like <artificial> or <built-in>
+			if (pakfire_string_startswith(basename, "<") && pakfire_string_endswith(basename, ">"))
+				continue;
+
+			CTX_DEBUG(stripper->ctx, "Found source file: %s\n", filename);
+
+			// Copy the file
+			r = pakfire_stripper_copy_source_file(stripper, filename);
+			if (r < 0) {
+				CTX_ERROR(stripper->ctx, "Could not copy source file %s: %s\n",
+					filename, strerror(-r));
+				goto ERROR;
+			}
+		}
+
+		offset = next_offset;
+	}
+
+ERROR:
+	if (f)
+		fclose(f);
+	if (dwarf)
+		dwarf_end(dwarf);
+
+	return r;
+}
+
 int pakfire_stripper_run(struct pakfire_stripper* stripper) {
 	int r;
 
@@ -159,7 +263,10 @@ int pakfire_stripper_run(struct pakfire_stripper* stripper) {
 	if (pakfire_filelist_is_empty(stripper->filelist))
 		return 0;
 
-	// XXX TODO
+	// Copy sources
+	r = pakfire_filelist_walk(stripper->filelist, pakfire_stripper_copy_sources, stripper, 0);
+	if (r < 0)
+		return r;
 
 	return 0;
 }