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-rw-r--r--difftool/options.c130
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+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * sqfsdiff.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "sqfsdiff.h"
+
+static struct option long_opts[] = {
+ { "old", required_argument, NULL, 'a' },
+ { "new", required_argument, NULL, 'b' },
+ { "no-owner", no_argument, NULL, 'O' },
+ { "no-permissions", no_argument, NULL, 'P' },
+ { "no-contents", no_argument, NULL, 'C' },
+ { "timestamps", no_argument, NULL, 'T' },
+ { "inode-num", no_argument, NULL, 'I' },
+ { "super", no_argument, NULL, 'S' },
+ { "extract", required_argument, NULL, 'e' },
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, 'V' },
+};
+
+static const char *short_opts = "a:b:OPCTISe:hV";
+
+static const char *usagestr =
+"Usage: sqfsdiff [OPTIONS...] --old,-a <first> --new,-b <second>\n"
+"\n"
+"Compare two squashfs images. In contrast to doing a direct diff of the\n"
+"images, this actually parses the filesystems and generates a more\n"
+"meaningful difference report.\n"
+"\n"
+"If only contents are compared, any differences in packed file layout,\n"
+"ordering, compression, inode allocation and so on is ignored and the two\n"
+"images are considered equal if each directory contains the same entries,\n"
+"symlink with the same paths have the same targets, device nodes the same\n"
+"device number and files the same size and contents.\n"
+"\n"
+"A report of any difference is printed to stdout. The exit status is similar\n"
+"that of diff(1): 0 means equal, 1 means different, 2 means problem.\n"
+"\n"
+"Possible options:\n"
+"\n"
+" --old, -a <first> The first of the two images to compare.\n"
+" --new, -b <second> The second of the two images to compare.\n"
+"\n"
+" --no-contents, -C Do not compare file contents.\n"
+" --no-owner, -O Do not compare file owners.\n"
+" --no-permissions, -P Do not compare permission bits.\n"
+"\n"
+" --timestamps, -T Compare file timestamps.\n"
+" --inode-num, -I Compare inode numbers of all files.\n"
+" --super, -S Also compare metadata in super blocks.\n"
+"\n"
+" --extract, -e <path> Extract files that differ to the specified\n"
+" directory. Contents of the first image end up\n"
+" in a subdirectory 'a' and of the second image\n"
+" in a subdirectory 'b'.\n"
+"\n"
+" --help, -h Print help text and exit.\n"
+" --version, -V Print version information and exit.\n"
+"\n";
+
+void process_options(sqfsdiff_t *sd, int argc, char **argv)
+{
+ int i;
+
+ for (;;) {
+ i = getopt_long(argc, argv, short_opts, long_opts, NULL);
+ if (i == -1)
+ break;
+
+ switch (i) {
+ case 'a':
+ sd->old_path = optarg;
+ break;
+ case 'b':
+ sd->new_path = optarg;
+ break;
+ case 'O':
+ sd->compare_flags |= COMPARE_NO_OWNER;
+ break;
+ case 'P':
+ sd->compare_flags |= COMPARE_NO_PERM;
+ break;
+ case 'C':
+ sd->compare_flags |= COMPARE_NO_CONTENTS;
+ break;
+ case 'T':
+ sd->compare_flags |= COMPARE_TIMESTAMP;
+ break;
+ case 'I':
+ sd->compare_flags |= COMPARE_INODE_NUM;
+ break;
+ case 'S':
+ sd->compare_super = true;
+ break;
+ case 'e':
+ sd->compare_flags |= COMPARE_EXTRACT_FILES;
+ sd->extract_dir = optarg;
+ break;
+ case 'h':
+ fputs(usagestr, stdout);
+ exit(EXIT_SUCCESS);
+ case 'V':
+ print_version();
+ exit(EXIT_SUCCESS);
+ default:
+ goto fail_arg;
+ }
+ }
+
+ if (sd->old_path == NULL) {
+ fputs("Missing arguments: first filesystem\n", stderr);
+ goto fail_arg;
+ }
+
+ if (sd->new_path == NULL) {
+ fputs("Missing arguments: second filesystem\n", stderr);
+ goto fail_arg;
+ }
+
+ if (optind < argc) {
+ fputs("Unknown extra arguments\n", stderr);
+ goto fail_arg;
+ }
+ return;
+fail_arg:
+ fprintf(stderr, "Try `sqfsdiff --help' for more information.\n");
+ exit(EXIT_FAILURE);
+}