How to unpack and pack pkg file?

I have a pkg file created by Install Maker for Mac. I want to replace one file in pkg. But I must do this under Linux system, because this is a part of download process. When user starts to download file server must replace one file in pkg. I have a solution how unpack pkg and replace a file but I dont know how pack again to pkg. http://emresaglam.com/blog/1035 http://ilostmynotes.blogspot.com/2012/06/mac-os-x-pkg-bom-files-package.html

Packages are just .xar archives with a different extension and a specified file hierarchy. Unfortunately, part of that file hierarchy is a cpio.gz archive of the actual installables, and usually that's what you want to edit. And there's also a Bom file that includes information on the files inside that cpio archive, and a PackageInfo file that includes summary information.

If you really do just need to edit one of the info files, that's simple:

mkdir Foo
cd Foo
xar -xf ../Foo.pkg
# edit stuff
xar -cf ../Foo-new.pkg *

But if you need to edit the installable files:

mkdir Foo
cd Foo
xar -xf ../Foo.pkg
cd foo.pkg
cat Payload | gunzip -dc |cpio -i
# edit Foo.app/*
rm Payload
find ./Foo.app | cpio -o | gzip -c > Payload
mkbom Foo.app Bom # or edit Bom
# edit PackageInfo
rm -rf Foo.app
cd ..
xar -cf ../Foo-new.pkg

I believe you can get mkbom (and lsbom) for most linux distros. (If you can get ditto, that makes things even easier, but I'm not sure if that's nearly as ubiquitously available.)

ccpizza

Inspired by the answer from abarnert, I made a bash script that will unpack a package named MyPackage.pkg into a subfolder named MyPackage_pkg and then open the folder in Finder. Remove the last line if you don't want the Finder step.

    #!/usr/bin/env bash
    filename="$*"
    dirname="${filename/\./_}"
    pkgutil --expand "$filename" "$dirname"
    cd "$dirname"
    tar xvf Payload
    open .

Usage:

    pkg-upack.sh MyPackage.pkg

Warning: This will not work in all cases, and will fail with certain files, e.g. the PKGs inside the OSX system installer. If you just want to peek inside the pkg file and see what's inside, you can try SuspiciousPackage (free app), and if you want to do some serious unpacking, including extracting specific files, then have a look at Pacifist (nagware).

In addition to what @abarnert said, I today had to find out that the default cpio utility on Mountain Lion uses a different archive format per default (not sure which), even with the man page stating it would use the old cpio/odc format. So, if anyone stumbles upon the cpio read error: bad file format message while trying to install his/her manipulated packages, be sure to include the format in the re-pack step:

find ./Foo.app | cpio -o --format odc | gzip -c > Payload

@shrx I've succeeded to unpack the BSD.pkg (part of the Yosemite installer) by using "pbzx" command.

pbzx <pkg> | cpio -idmu

The "pbzx" command can be downloaded from the following link:

pbzx Stream Parser

You might want to look into my fork of pbzx here: https://github.com/NiklasRosenstein/pbzx

It allows you to stream pbzx files that are not wrapped in a XAR archive. I've experienced this with recent XCode Command-Line Tools Disk Images (eg. 10.12 XCode 8).

pbzx -n Payload | cpio -i

来源：https://stackoverflow.com/questions/11298855/how-to-unpack-and-pack-pkg-file

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