[Fedora-packaging] APT,YUM and package status

[George Machitidze]

Hi

I don't think this is right place, the best you can do is check rpm docs at
rpm.org (very extensive docs a and books)
If you want to be a packager - you have to check Fedora packaging
guidelines:
http://fedoraproject.org/wiki/Packaging:Guidelines

But I'll answer you anyway:

At first, you have to understand and separate backend and frontend:

rpm, dpkg - package manager backends and libraries for operating on DB
populated with current situation, not the repos
yum, apt - package manager frontends with databases related to repository
and upgrade operations

Do not confuse yum/apt with rpm/dpkg.

RPM is using sqlite database populated in /var/lib/rpm/, you should never
operate on it directly. rpm, rpm libraries and yum utilities provide
interface for you to manage packages, there is no reason to touch DB
manually.

1) RPM doesn't use plaintext database
2) /var/cache/yum/
3) yum search MY_PACKAGE (will update cache), or yum search -C MY_PACKAGE
(run entirely from system cache, don't update cache)
4) --skip-broken skips broken packages, dependencies are always solved
automatically
5) yum update, usually cache is always update, unless -C is specified.
/var/lib/yum, /var/cache/yum
6) yum doesn't operate on it's own configuration files, yum will need to
create repo file in /etc/yum/repos.d as xxx.repo like:
[somerepo]
name=cdrom files
baseurl=file:///mnt/cdrom
*
*7) Doesn't need it actually, this is handled by rpm backend. rpm leaves
any changed (checked with md5) configuration files with .rpmsave filename
extension. rpm knows which files are configuration files.
8) yum whatprovides "/path/file"
9) rpm -qa

Best regards,
George Machitidze


On Tue, Oct 9, 2012 at 3:45 AM, Mohsen Pahlevanzadeh <
mohsen at pahlevanzadeh.org> wrote:

> Dear all,
>
> I have more question on comparison of YUM and APT:
> 1) in apt systems, /var/lib/dpkg/status exists and keeps information
> about installed packages such as marked as remove and etc, what's its
> equivalent in yum systems?
> 2) in apt systems, /var/cache/apt/archives keeps  *deb files as
> temporarily, What's its equivalent in yum systems?
> 3) apt-cache command search on local cache about a package such as
> 'apt-cache search MY_PACKAGE', now can i do it with yum systems? if true
> which command?
> 4) apt-get has -f (--fixed-broken), yum does has it? such as 'apt-get -f
> install' ? when you use 'apt-get -f install' or 'apt-get -f
> dist-upgrade' APT system resolve installed packages and solve any
> problem.
> 5) in apt systems at first we use 'apt-get update' to download
> information of packages.Then they are cached in /var/lib/apt/lists/ ,
> What's equivalent of apt-get update and /var/lib/apt/lists/ ?
> 6) We use 'apt-cdrom add' to add cdrom repo to my machine, What's its
> equivalent in yum?
> 7) --purge and -e is different in dpkg or apt-get purge or apt-get
> reomve, Do you have same concept in yum?(remove doesn't remove
> information in status file, but purge remove them)
> 8) we have apt-file command that it search on repo and get a file as arg
> and returns package names that arg exist in them.Do you have in yum?
> 9) /var/lib/dpkg/available : list of installed packages.
>
>
> --thank you,
> Mohsen
>
>
> On Sat, 2012-10-06 at 06:54 -0500, Rex Dieter wrote:
> > On 10/06/2012 12:40 AM, Mohsen Pahlevanzadeh wrote:
> > > Dear Matthew and Christopher,
> > >
> > > At first, sorrry for late, and thank you for your reply and your
> > > attention.
> > > In Debian systems:
> > > Directory /var/lib/apt/ keeps cache of repos, then users can search
> > > offline with apt-cache search blahblah , What's this scenario in yum
> > > system? and Where the given directory ?
> >
> > /var/cache/yum
> >
> > Use
> > yum -C
> > or
> > yum --cacheonly
> >
> > -- rex
> >
> > --
> > packaging mailing list
> > packaging at lists.fedoraproject.org
> > https://admin.fedoraproject.org/mailman/listinfo/packaging
>
>
> --
> packaging mailing list
> packaging at lists.fedoraproject.org
> https://admin.fedoraproject.org/mailman/listinfo/packaging
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