add mtdutils mkfs.jffs2 --graft option
we'd like a bit more of the convenience of mksquashfs (never thought I'd say _that_) for jffs2, in particular not having to copy all the desired store paths into a single directory just so we can create an image from themmodule-based-network
parent
e0bd64b80f
commit
98243d43da
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@ -14,6 +14,12 @@ let
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});
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in
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extraPkgs // {
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mtdutils = prev.mtdutils.overrideAttrs(o: {
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patches = (if o ? patches then o.patches else []) ++ [
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./pkgs/mtdutils/0001-mkfs.jffs2-add-graft-option.patch
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];
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});
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strace = prev.strace.override { libunwind = null; };
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kexec-tools-static = prev.kexec-tools.overrideAttrs(o: {
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@ -0,0 +1,147 @@
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From e01c82f9f405dd24d333ffd1aadd772835706e26 Mon Sep 17 00:00:00 2001
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From: Daniel Barlow <dan@telent.net>
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Date: Fri, 31 Mar 2023 23:33:04 +0100
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Subject: [PATCH] mkfs.jffs2: add --graft option
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Allows creation of image from more than one source directory tree,
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using --graft src:dest to graft new subtrees into the output. For
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example
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mkfs.jffs2 -r ./rootfs --graft $HOME/Pictures:/pictures
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to add your photo collection into the filesystem at /pictures
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without first copying it to rootfs
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---
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jffsX-utils/mkfs.jffs2.c | 61 ++++++++++++++++++++++++++++++++++++++--
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1 file changed, 59 insertions(+), 2 deletions(-)
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diff --git a/jffsX-utils/mkfs.jffs2.c b/jffsX-utils/mkfs.jffs2.c
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index bd67634..c54bcb8 100644
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--- a/jffsX-utils/mkfs.jffs2.c
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+++ b/jffsX-utils/mkfs.jffs2.c
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@@ -112,6 +112,13 @@ static int squash_perms = 0;
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static int fake_times = 0;
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int target_endian = __BYTE_ORDER;
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+struct graft {
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+ struct graft *next;
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+ const char * source;
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+ const char * dest;
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+} * grafts = 0;
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+
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+
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static uint32_t find_hardlink(struct filesystem_entry *e)
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{
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struct filesystem_entry *f;
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@@ -597,6 +604,14 @@ static void cleanup(struct filesystem_entry *dir)
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}
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}
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+static void free_grafts(struct graft *graft)
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+{
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+ if(graft->next) free_grafts(graft->next);
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+ free((char *)graft->source);
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+ free((char *)graft);
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+}
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+
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+
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/* Here is where we do the actual creation of the file system */
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#include "mtd/jffs2-user.h"
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@@ -1359,6 +1374,7 @@ static void create_target_filesystem(struct filesystem_entry *root)
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static struct option long_options[] = {
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{"pad", 2, NULL, 'p'},
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{"root", 1, NULL, 'r'},
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+ {"graft", 1, NULL, 'G'},
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{"pagesize", 1, NULL, 's'},
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{"eraseblock", 1, NULL, 'e'},
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{"output", 1, NULL, 'o'},
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@@ -1396,6 +1412,9 @@ static const char helptext[] =
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" not specified, the output is padded to the end of\n"
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" the final erase block\n"
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" -r, -d, --root=DIR Build file system from directory DIR (default: cwd)\n"
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+" -G, --graft=SOURCE:DEST Add contents of SOURCE directory at DEST in image.\n"
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+" May be given more than once. DEST must exist in\n"
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+" root DIR or a previous graft. \n"
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" -s, --pagesize=SIZE Use page size (max data node size) SIZE.\n"
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" Set according to target system's memory management\n"
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" page size (default: 4KiB)\n"
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@@ -1430,6 +1449,24 @@ static const char helptext[] =
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" -V, --version Display version information\n"
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" -i, --incremental=FILE Parse FILE and generate appendage output for it\n\n";
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+static int add_graft(const char * source, const char *dest)
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+{
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+ struct graft * graft;
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+ struct stat st;
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+
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+ if (stat(source, &st)) {
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+ errmsg_die("bad graft source '%s'", source);
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+ }
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+
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+ if(!grafts) grafts = calloc(sizeof (struct graft), 1);
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+ for(graft = grafts; graft->next; graft = graft->next)
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+ ;
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+ graft->source = source;
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+ graft->dest = dest;
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+ graft->next = calloc(sizeof (struct graft), 1);
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+ return 0;
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+}
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+
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static int load_next_block(void) {
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int ret;
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@@ -1579,7 +1616,7 @@ int main(int argc, char **argv)
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jffs2_compressors_init();
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while ((opt = getopt_long(argc, argv,
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- "D:d:r:s:o:qUPfh?vVe:lbp::nc:m:x:X:Lty:i:", long_options, &c)) >= 0)
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+ "D:d:r:G:s:o:qUPfh?vVe:lbp::nc:m:x:X:Lty:i:", long_options, &c)) >= 0)
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{
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switch (opt) {
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case 'D':
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@@ -1598,6 +1635,18 @@ int main(int argc, char **argv)
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rootdir = xstrdup(optarg);
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break;
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+ case 'G':
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+ if(strchr(optarg, ':')) {
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+ char * src_name, * dest_name;
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+ src_name = xstrdup(optarg);
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+ dest_name = strchr(src_name, ':');
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+ *dest_name = '\0';
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+ dest_name++;
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+ add_graft(src_name, dest_name);
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+ } else
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+ errmsg_die("bad graft specification '%s', expecting source:dest",
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+ optarg);
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+ break;
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case 's':
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page_size = strtol(optarg, NULL, 0);
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warn_page_size = 0; /* set by user, so don't need to warn */
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@@ -1784,13 +1833,21 @@ int main(int argc, char **argv)
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parse_image();
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root = recursive_add_host_directory(NULL, "/", cwd);
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-
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+ for(struct graft *g = grafts; g->source; g=g->next) {
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+ struct filesystem_entry * entry =
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+ find_filesystem_entry(root, (char *) g->dest, S_IFDIR);
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+ if(!entry)
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+ errmsg_die("missing directory %s for graft point %s",
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+ g->dest, g->source);
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+ recursive_add_host_directory(entry, g->dest, g->source);
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+ }
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if (devtable)
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parse_device_table(root, devtable);
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create_target_filesystem(root);
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cleanup(root);
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+ free_grafts(grafts);
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if (rootdir != default_rootdir)
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free(rootdir);
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--
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2.38.1
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