From d9549b3d288a9cb053ab5198f3bc2d277b72600f Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Thu, 18 Feb 2021 22:05:48 +0100
Subject: gensquashfs: always construct input path during option processing

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 bin/gensquashfs/mkfs.c    | 38 ++++----------------------------------
 bin/gensquashfs/mkfs.h    |  5 ++++-
 bin/gensquashfs/options.c | 23 ++++++++++++++++++++++-
 3 files changed, 30 insertions(+), 36 deletions(-)

diff --git a/bin/gensquashfs/mkfs.c b/bin/gensquashfs/mkfs.c
index 4120242..2885d84 100644
--- a/bin/gensquashfs/mkfs.c
+++ b/bin/gensquashfs/mkfs.c
@@ -6,39 +6,6 @@
  */
 #include "mkfs.h"
 
-static int set_working_dir(options_t *opt)
-{
-	const char *ptr;
-	char *path;
-
-	if (opt->packdir != NULL) {
-		if (chdir(opt->packdir)) {
-			perror(opt->packdir);
-			return -1;
-		}
-		return 0;
-	}
-
-	ptr = strrchr(opt->infile, '/');
-	if (ptr == NULL)
-		return 0;
-
-	path = strndup(opt->infile, ptr - opt->infile);
-	if (path == NULL) {
-		perror("constructing input directory path");
-		return -1;
-	}
-
-	if (chdir(path)) {
-		perror(path);
-		free(path);
-		return -1;
-	}
-
-	free(path);
-	return 0;
-}
-
 static int pack_files(sqfs_block_processor_t *data, fstree_t *fs,
 		      options_t *opt)
 {
@@ -52,8 +19,10 @@ static int pack_files(sqfs_block_processor_t *data, fstree_t *fs,
 	int flags;
 	int ret;
 
-	if (set_working_dir(opt))
+	if (opt->packdir != NULL && chdir(opt->packdir) != 0) {
+		perror(opt->packdir);
 		return -1;
+	}
 
 	for (fi = fs->files; fi != NULL; fi = fi->next) {
 		if (fi->input_file == NULL) {
@@ -224,5 +193,6 @@ out:
 	sqfs_writer_cleanup(&sqfs, status);
 	if (sehnd != NULL)
 		selinux_close_context_file(sehnd);
+	free(opt.packdir);
 	return status;
 }
diff --git a/bin/gensquashfs/mkfs.h b/bin/gensquashfs/mkfs.h
index e1e4e1b..c43c10a 100644
--- a/bin/gensquashfs/mkfs.h
+++ b/bin/gensquashfs/mkfs.h
@@ -42,10 +42,13 @@ typedef struct {
 	sqfs_writer_cfg_t cfg;
 	unsigned int dirscan_flags;
 	const char *infile;
-	const char *packdir;
 	const char *selinux;
 	bool no_tail_packing;
 
+	/* copied from command line or constructed from infile argument
+	   if not specified. Must be free'd. */
+	char *packdir;
+
 	unsigned int force_uid_value;
 	unsigned int force_gid_value;
 	bool force_uid;
diff --git a/bin/gensquashfs/options.c b/bin/gensquashfs/options.c
index 9153265..ec2263c 100644
--- a/bin/gensquashfs/options.c
+++ b/bin/gensquashfs/options.c
@@ -267,7 +267,12 @@ void process_command_line(options_t *opt, int argc, char **argv)
 			opt->infile = optarg;
 			break;
 		case 'D':
-			opt->packdir = optarg;
+			free(opt->packdir);
+			opt->packdir = strdup(optarg);
+			if (opt->packdir == NULL) {
+				perror(optarg);
+				exit(EXIT_FAILURE);
+			}
 			break;
 #ifdef WITH_SELINUX
 		case 's':
@@ -316,8 +321,24 @@ void process_command_line(options_t *opt, int argc, char **argv)
 		fputs("Unknown extra arguments specified.\n", stderr);
 		goto fail_arg;
 	}
+
+	/* construct packdir if not specified */
+	if (opt->packdir == NULL && opt->infile != NULL) {
+		const char *split = strrchr(opt->infile, '/');
+
+		if (split != NULL) {
+			opt->packdir = strndup(opt->infile,
+					       split - opt->infile);
+
+			if (opt->packdir == NULL) {
+				perror("constructing input directory path");
+				exit(EXIT_FAILURE);
+			}
+		}
+	}
 	return;
 fail_arg:
 	fputs("Try `gensquashfs --help' for more information.\n", stderr);
+	free(opt->packdir);
 	exit(EXIT_FAILURE);
 }
-- 
cgit v1.2.3