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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2021-11-01 12:02:02 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2022-03-30 22:31:30 +0200
commit2b84065a0f82e71e3f82fcd3148daa29f35a6597 (patch)
tree24d8108404ed9486766888b02581dfe1cfd04843 /bin
parenta41a57834fc70541ada5579e2d74114f7113e9bc (diff)
Add a sort-file option to gensquashfs
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'bin')
-rw-r--r--bin/gensquashfs/mkfs.c16
-rw-r--r--bin/gensquashfs/mkfs.h1
-rw-r--r--bin/gensquashfs/options.c44
3 files changed, 59 insertions, 2 deletions
diff --git a/bin/gensquashfs/mkfs.c b/bin/gensquashfs/mkfs.c
index 9e8e2d0..cb891f9 100644
--- a/bin/gensquashfs/mkfs.c
+++ b/bin/gensquashfs/mkfs.c
@@ -52,7 +52,7 @@ static int pack_files(sqfs_block_processor_t *data, fstree_t *fs,
return -1;
}
- flags = 0;
+ flags = fi->flags;
filesize = file->get_size(file);
if (opt->no_tail_packing && filesize > opt->cfg.block_size)
@@ -141,6 +141,7 @@ static void override_owner_dfs(const options_t *opt, tree_node_t *n)
int main(int argc, char **argv)
{
int status = EXIT_FAILURE;
+ istream_t *sortfile = NULL;
void *sehnd = NULL;
sqfs_writer_t sqfs;
options_t opt;
@@ -156,6 +157,12 @@ int main(int argc, char **argv)
goto out;
}
+ if (opt.sortfile != NULL) {
+ sortfile = istream_open_file(opt.sortfile);
+ if (sortfile == NULL)
+ goto out;
+ }
+
if (opt.infile == NULL) {
if (fstree_from_dir(&sqfs.fs, sqfs.fs.root, opt.packdir,
NULL, NULL, opt.dirscan_flags)) {
@@ -179,6 +186,11 @@ int main(int argc, char **argv)
}
}
+ if (sortfile != NULL) {
+ if (fstree_sort_files(&sqfs.fs, sortfile))
+ goto out;
+ }
+
if (pack_files(sqfs.data, &sqfs.fs, &opt))
goto out;
@@ -190,6 +202,8 @@ out:
sqfs_writer_cleanup(&sqfs, status);
if (sehnd != NULL)
selinux_close_context_file(sehnd);
+ if (sortfile != NULL)
+ sqfs_destroy(sortfile);
free(opt.packdir);
return status;
}
diff --git a/bin/gensquashfs/mkfs.h b/bin/gensquashfs/mkfs.h
index c43c10a..4f455bd 100644
--- a/bin/gensquashfs/mkfs.h
+++ b/bin/gensquashfs/mkfs.h
@@ -43,6 +43,7 @@ typedef struct {
unsigned int dirscan_flags;
const char *infile;
const char *selinux;
+ const char *sortfile;
bool no_tail_packing;
/* copied from command line or constructed from infile argument
diff --git a/bin/gensquashfs/options.c b/bin/gensquashfs/options.c
index 14c37ab..fc2d900 100644
--- a/bin/gensquashfs/options.c
+++ b/bin/gensquashfs/options.c
@@ -35,12 +35,13 @@ static struct option long_opts[] = {
#ifdef WITH_SELINUX
{ "selinux", required_argument, NULL, 's' },
#endif
+ { "sort-file", required_argument, NULL, 'S' },
{ "version", no_argument, NULL, 'V' },
{ "help", no_argument, NULL, 'h' },
{ NULL, 0, NULL, 0 },
};
-static const char *short_opts = "F:D:X:c:b:B:d:u:g:j:Q:kxoefqThV"
+static const char *short_opts = "F:D:X:c:b:B:d:u:g:j:Q:S:kxoefqThV"
#ifdef WITH_SELINUX
"s:"
#endif
@@ -98,6 +99,10 @@ static const char *help_string =
" directory entries actually specify.\n"
" --all-root A short hand for `--set-uid 0 --set-gid 0`.\n"
"\n"
+" --sort-file, -S <file> Specify a \"sort file\" that can be used to\n"
+" micro manage the order of files during packing\n"
+" and behaviour (compression, fragmentation, ..)\n"
+"\n"
#ifdef WITH_SELINUX
" --selinux, -s <file> Specify an SELinux label file to get context\n"
" attributes from.\n"
@@ -169,6 +174,39 @@ const char *help_details =
" glob /usr/lib 0777 0 0 -type l -name \"*.so.*\" ./lib\n"
"\n\n";
+const char *sort_details =
+"When using a sort file, the order in which regular files are packed can be\n"
+"changed, as well as packing behaviour. Each line in the sort file consists\n"
+"of a numeric priority (can be negative, lower priority is packed first),\n"
+"followed by optional packing flags, followed by the file path.\n"
+"\n"
+"The fields are white-space separated. The flags are comma seperated and\n"
+"contained within two square bracktes. Single line comments with `#` and\n"
+"empty lines are allowed.\n"
+"\n"
+"The default priority for un-listed files is 0. The filename specifies the\n"
+"path within the SquashFS image and is normalized. If e.g. spaces at the\n"
+"beginning or end are needed, it can be enclosed in double quotes `\"`\n"
+"and back-slash can be used for escaping.\n"
+"\n"
+"The sorting algorithm is stable, so files with the same priority do not\n"
+"change place relative to each other in their initial ordering.\n"
+"\n"
+"Example:\n"
+" # Specify a packing order with file globbing\n"
+" -8000 [glob] bin/*\n"
+" -5000 [glob] lib/*\n"
+"\n"
+" # glob_no_path means * is allowed to match /\n"
+" -1000 [glob_no_path] share/*\n"
+"\n"
+" # Our boot loader needs this\n"
+" -100000 [dont_compress,dont_fragment,nosparse] boot/vmlinuz\n"
+"\n"
+" # For demonstration, a quoted filename and no flags\n"
+" 1337 \"usr/share/my \\\"special\\\" file \"\n"
+"\n\n";
+
void process_command_line(options_t *opt, int argc, char **argv)
{
bool have_compressor;
@@ -285,10 +323,14 @@ void process_command_line(options_t *opt, int argc, char **argv)
opt->selinux = optarg;
break;
#endif
+ case 'S':
+ opt->sortfile = optarg;
+ break;
case 'h':
printf(help_string,
SQFS_DEFAULT_BLOCK_SIZE, SQFS_DEVBLK_SIZE);
fputs(help_details, stdout);
+ fputs(sort_details, stdout);
compressor_print_available();
exit(EXIT_SUCCESS);
case 'V':