Rolling Back an Update Post: 302634907

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Operating Systems Linux Rolling Back an Update Post 302634907 by Corona688 on Friday 4th of May 2012 02:46:08 AM

05-04-2012

Registered User

Linux, and UNIX in general, are very "unmagical". Get the bootloader running, put the right files in the right places with the right permissions, and it should do what it's told. I've replicated entire linux systems with nothing but fdisk, mkfs, tar, and grub-install -- that is, replicated a system at the file-level, not the disk-level, and had it operate perfectly.

The UNIX philosophy is also "a program should do one thing and do it well". Your installer is your installer; your backup system is your backup system. Why would there be a special restore for applications alone when you can cover the whole system the same way? When everything is a file, you can roll back an installation by simply rolling back files. This makes recovering from installs simply a manner of keeping proper backups.

Windows on the other hand really needs it due to design decisions. Backing up files is not enough. Its opaque, always-live, and heavily centralized registry system means you can get all the right files in the right places but unless you capture the registry values at the exact right instant, it may be all for naught, and need an installer that doesn't just install and uninstall, but also keeps its own backups, does scanning and repair, and other such maintenance. Each application needs its own installer to do this, though a lot use one made from a template. And it still breaks down far too often because of how Windows has divorced its configuration from its filesystem.

Last edited by Corona688; 05-04-2012 at 04:15 AM..

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LEARN ABOUT X11R4

install-solaris

install-solaris(1M)													       install-solaris(1M)

NAME

       install-solaris - install the Solaris operating system

SYNOPSIS

       install-solaris

       install-solaris	invokes  the  Solaris  Install	program. Depending on graphical capability and available memory at the time of invocation,
       install-solaris invokes either a text-based installer or a graphical installer.

       The following minimum requirements for physical memory dictate which features are available during installation:

       For SPARC machines:

       128 MB

	   Minimum physical memory for all installation types

       128 MB

	   Minimum physical memory required for windowing system

       384 MB

	   Minimum physical memory required for graphical-based installation

       For x86 machines:

       256 MB

	   Minimum physical memory for all installation types

       256 MB

	   Minimum physical memory required for windowing system

       512 MB

	   Minimum physical memory required for graphical-based installation

       In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number  of  fea-
       tures available.

       install-solaris	exists	only  on  the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the  for more
       details.

       install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the
       installation media. Refer to the  for disk space requirements.

       Refer to the  for more information on the various menus and selections.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcdrom  (Solaris instal-  |
       |			     |lation media)		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       pkginfo(1), install(1M), pkgadd(1M), attributes(5)

       It is advisable to exit install-solaris by means of the exit options in the install-solaris menus.

								    23 Sep 2005 					       install-solaris(1M)