diff options
Diffstat (limited to 'difftool/options.c')
| -rw-r--r-- | difftool/options.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/difftool/options.c b/difftool/options.c new file mode 100644 index 0000000..8224b1d --- /dev/null +++ b/difftool/options.c @@ -0,0 +1,130 @@ +/* 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); +} |