Usage
make_ext4fs_9 [ -l ] [ -j ] [ -b <block_size> ] [ -g ] [ -i ] [ -I ] [ -L ] [ -f ] [ -a ] [ -S file_contexts ] [ -C fs_config ] [ -T timestamp ] [ -z | -s ] [ -w ] [ -c ] [ -J ] [ -v ] [ -B <block_list_file> ] []
From original fork
This is yet another clone of make_ext4fs & friends, split from the superr/make_ext4fs repository.
The reason for cloning was to fix a severe bug and to add a few features needed by the Android firmware construction kit project.
Also I needed identical builds for linux and windows. That was achieved by modifying makefiles to support cross-building with mingw.
The behaviour of make_ext4fs has been modified in the following ways:
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In fs_config you can specify -1 in the place of uid, gid and mode. If the respective field is -1, the original value is retained (uid and gid have value 0 by default, and mode is taken from filesystem).
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If a file is missing from fs_config, a warning is displayed but the uid, gid and mode are computed using the default rules (same like fs_config is not specified).
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The Windows version of make_ext4fs now can scan directories, same way as it does in Unix. MinGW will report mode 0666 for files and 0777 for directories; this is not very useful, so better set file modes in fs_config.
However, this is useful to see if you ommited any files from fs_config, due to previous modification.
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If during image creation it turns out that one of the source files cannot be open, the tool will:
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under Linux it will make an attempt to temporarily change file mode to 0444, then open it, then restore the original file mode.
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if that fails anyway, a error message will be printed to stderr, with a pointer to the file that cannot be read. Also a error flag will be returned that will tell the tool to delete the invalid image (and a message will be displayed about that too).
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Mingw build now has support for Cygwin-style symlinks. Here's a example hex dump of such a file, say, /bin/ls:
00000000 21 3C 73 79 │ 6D 6C 69 6E │ 6B 3E FF FE │ 74 00 6F 00 │ 79 00 62 00 !<symlink>..t.o.y.b. 00000014 6F 00 78 00 │ 5F 00 76 00 │ 65 00 6E 00 │ 64 00 6F 00 │ 72 00 00 00 o.x._.v.e.n.d.o.r...The resulting ext4 image will contain a real link /bin/ls pointing to "toybox_vendor".
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Mingw build now has support for SELinux labeling. The labels cannot be extracted from file system (this is obvious), but instead the -S option can be used to provide a filename -> SELinux context map. You can use regular expressions in file names.
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Fixed crashes when image size is not enough for filesystem metadata.