Re: [Libguestfs] Rethinking appliance building

On Sun, Dec 5, 2010 at 10:56 AM, Richard W.M. Jones <rjones(a)redhat.com&gt;wrote: > To make this even more explicit: > > > (1) There has to be a way to detect that the package manager should > > be used, eg. by looking for /etc/arch-release > > RPM: check for existence of /etc/redhat-release > Debian: check for existence of /etc/debian_version Arch: check for existence of /etc/arch-release Arch: Or check the kernel version for "ARCH" with a uname -r > > (2) There must be a way to take a list of package names, and fully > > resolve all dependencies (recursively as necessary) to get a complete > > list of packages that must be installed to bootstrap. > > RPM: [lots of Yum API magic] > Debian: apt-cache depends --recurse -i <list of package names> > Arch: pactree -l <list of package names> | sort -u pactree is part of the pacman-contrib package > > > (3) Must be a way to download a package. > > RPM: yumdownloader <name of package> > Debian: aptitude download <name of package> > Arch: pacman -Sw --cachedir=<Where to download> <name of package(s)> This will download the package to the cachedir: /var/cache/pacman/pkg > > > (4) Must be able to list out the files in a downloaded package. > > RPM: rpm -qlp foo.rpm > Debian: dpkg-deb -c foo.deb > pacman -Qlp foo.pkg.tar.xz > > > (5) Must be able to extract a single file from a downloaded package. > > RPM: rpm2cpio foo.rpm | cpio -id > Debian: dpkg-deb --fsys-tarfile foo.deb | tar xf - > Arch: tar xf foo.pkg.tar.xz Arch packages are just tarballs with a PKGINFO file in the root directory which has package metadata > > So it's almost enough for you to tell me the equivalent of those > commands for pacman, although of course I'd prefer a patch to > febootstrap! > > Rich. > > -- > Richard Jones, Virtualization Group, Red Hat > http://people.redhat.com/~rjones > virt-p2v converts physical machines to virtual machines. Boot with a > live CD or over the network (PXE) and turn machines into Xen guests. > http://et.redhat.com/~rjones/virt-p2v > Here are the answers, and all commands work as non-root, before running any commands the package database would need to be updated by running "pacman -Sy" I will grab a git checkout of febootstrap and start looking into prepping a patch, but if this is enough info for you to whip up support then let me know and I will test it and fix any arch specific things. Thanks! -Tom Hatch