Working with cpio archives in .NET

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Working with cpio archives
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It is much less likely that you will need to work very often with cpio archives, so we show here just a simple example of creating an archive and extracting the files from it. When creating an archive, cpio takes a list of filenames and uses them to decide which files to include in the archive:
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user@bible:~/temp> ls | cpio -vo > ../temp.cpio
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This lists the files in the current directory and passes the filenames to cpio, which creates an archive on standard output (the -o option), verbosely (the -v option). If you want to create an archive containing everything under the current directory, you can use find to list all the relevant paths and pipe its output to cpio:
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user@bible:~/temp> find . | cpio vo > ../temp.cpio
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To unpack an archive, use the following:
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user@bible:~/another_directory > cpio -ivd < temp.cpio
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This unpacks (the i option) the archive under the current directory, creating new directories as necessary (the -d option).
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The common zip archive format (associated with the DOS and Windows programs PKZIP and WinZip among others) is well supported on Linux. To unzip a zip archive, simply do the following:
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user@bible:~/temp> unzip zipfile.zip
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To create a zip archive of the current directory:
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user@bible:~/temp> zip -r ~/other/newzip.zip .
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This will recursively zip up the current directory and create the zip file newzip.zip in the directory ~/other. The program zipinfo will give a listing and information about compression ratios:
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user@bible:~/temp> zipinfo zipfile.zip Archive: zipfile.zip 7762 bytes 4 files -rw-r--r-- 2.3 unx 2048 bx stor 21-Jun-04 20:06 afile -rw-r--r-- 2.3 unx 4096 bx stor 21-Jun-04 20:07 bfile drwxr-xr-x 2.3 unx 0 bx stor 21-Jun-04 20:10 directory/ -rw-r--r-- 2.3 unx 2048 bx defN 21-Jun-04 20:10 directory/cfile 4 files, 8192 bytes uncompressed, 7230 bytes compressed: 11.7%
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13 Working with Files
Unpacking RPM packages
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Typically, you can do everything you need to manipulate RPM packages using the rpm command, but it is sometimes useful to know that you can convert an RPM package to a cpio archive as follows:
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user@bible:~/temp> rpm2cpio partimage-0.6.2-152.i586.rpm >partimage.cpio
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You can then unpack the archive under the current directory with:
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user@bible:~/temp> cpio -ivd < partimage.cpio
Here again, the i option unpacks the archive, while the d option creates the necessary directories as cpio verbosely (v) operates on the archive. You will find directories under the current directory corresponding to the system locations where rpm will install the particular files. This corresponds to what you see if you look inside the rpm package with mc, for example.
Using pax
A nice alternative to tar and cpio is pax, which is capable of unpacking archives in both these formats. Its command syntax is also simpler to learn than either tar or cpio, both of which can give a new user headaches. It also offers a neater solution than tar to the problem of exactly copying an entire directory tree complete with permissions, timestamps, and symbolic links from one place to another. To create a pax archive file of the current directory, do the following:
user@bible:~/tmp> pax -wvf pe /tmp/archive.pax .
This writes (-w) verbosely (-v) the file (-f) /tmp/archive.pax, archiving the current directory (.). The -pe option indicates that we want to preserve everything that is, preserve all ownerships and permissions. To unpack the archive somewhere else, do the following:
root@bible:/another_directory # pax rvf archive.pax
Here we are verbosely (v) reading (r) from the archive file, and pax by default writes out the archived directories and files to disk under the current directory. To be sure that all the permissions and ownerships will be restored, you will need to do this as root. To list the files in the archive, simply do the following:
user@bible:/another_directory > pax -f archive.pax
If you have a gzipped tar file, you can unpack it with pax like this:
user@bible:~/tmp> pax -rzvf archive.tgz
Here the r option shows that you are reading from the archive, while the z indicates that you need gzip uncompression. To unpack a cpio archive, do the following:
user@bible:~/tmp> pax -rvf archive.cpio
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To copy a directory tree preserving all ownerships and permissions, do the following:
root@bible: / # pax -rvw -pe /source/ /path/to/destination/
Here you read (r) from the source directory and write (w) to the destination directory, while preserving (-p) everything (e) (in other words all ownerships and permissions).