[Yum] Using a fast internet connexion to update a computer with a slow one

[Enrique Perez-Terron]

On Wed, 2004-08-04 at 06:46, Daniel Gagnon wrote:
> I was wondering if there was a way for a user of Fedora Core 2 with
> only a 56K modem to download update on a computer that have a
> broadband connexion (but unfortunately, Windows) and carry them (on
> CDs, probably) to the computer with the slow connexion.
> 
> And how can yum be used in the process ?
> 

Perhaps you could apply the following patch in /usr/share/yum, and then
try the command:

  yum list downloads_for update > /tmp/yum-downloads

After the "downloads_for" keywords follows any command line that would
be a legal yum command without "list downloads_for".

The output consists of two "words" per line, separated by tabs:
 1) an absolute pathname starting with /var/cache/yum, and 
 2) an argument you could give to wget.

There is one line per object yum would download if run without "list
downloads_for".

When you have arranged that the files have been downloaded and placed in
the corresponding file names, I believe you can do yum -C update or
whatever was the command after "list downloads_for".

-Enrique

--- save-yummain.py	2004-05-11 22:24:48.000000000 +0200
+++ yummain.py	2004-08-05 20:56:40.000000000 +0200
@@ -81,7 +81,7 @@
         # version of yum
         conf.yumversion = __version__
         # we'd like to have a log object now
-        log=Logger(threshold=conf.debuglevel, file_object=sys.stdout)
+        log=Logger(threshold=conf.debuglevel, file_object=sys.stderr)
         # syslog-style log
         if conf.uid == 0:
             logfd=os.open(conf.logfile, os.O_WRONLY | os.O_APPEND | os.O_CREAT, 0644)
--- save-clientStuff.py	2004-05-11 22:24:48.000000000 +0200
+++ clientStuff.py	2004-08-05 20:44:05.000000000 +0200
@@ -1097,7 +1097,12 @@
             pkgaction.listpkginfo(nulist, 'all', HeaderInfo, short)
             sys.exit(0)
         else:
-            if cmds[0] == 'updates':
+            if cmds[0] == 'downloads_for':
+                cmds.pop(0)
+                take_action(cmds, nulist, uplist, newlist, obsoleting, tsInfo, HeaderInfo, rpmDBInfo, obsoleted)
+                list_downloads(tsInfo)
+                sys.exit(0)
+            elif cmds[0] == 'updates':
                 pkgaction.listpkginfo(uplist, 'updates', HeaderInfo, short)
             elif cmds[0] == 'available':
                 pkgaction.listpkginfo(newlist, 'all', HeaderInfo, short)
@@ -1168,8 +1173,37 @@
             sys.exit(1)
         sys.exit(0)    
     else:
+        log(2, _('Unknown command ' + basecmd))
         usage()
 
+def list_downloads(tsInfo):
+    """List all packages that would be downloaded, and their corresponding locations in the cache"""
+    for (name, arch) in tsInfo.NAkeys():
+	state = tsInfo.state(name, arch)
+	if state in ['u', 'ud', 'iu', 'i' ]: # inst/update
+	    pkghdr = tsInfo.getHeader(name, arch)
+	    rpmloc = tsInfo.localRpmPath(name, arch)
+            if os.path.exists(rpmloc):
+                log(4, 'Checking cached RPM %s' % (os.path.basename(rpmloc)))
+                if not rpmUtils.checkRpmMD5(rpmloc):
+                    errorlog(0, _('Damaged RPM %s, removing.') % (rpmloc))
+                    os.unlink(rpmloc)
+                else:
+                    rpmobj = rpmUtils.RPM_Work(rpmloc)
+                    hdre = pkghdr['epoch']
+                    hdrv = pkghdr['version']
+                    hdrr = pkghdr['release']
+                    (rpme, rpmv, rpmr) = rpmobj.evr()
+                    if (rpme, rpmv, rpmr) != (hdre, hdrv, hdrr):
+                        errorlog(2, _('NonMatching RPM version, %s, removing.') %(rpmloc))
+                        os.unlink(rpmloc)
+
+            if os.path.exists(rpmloc):
+                pass
+            else:
+                remoterpmurl = tsInfo.remoteRpmUrl(name, arch)
+		print rpmloc, '\t', remoterpmurl
+
 def download_packages(tsInfo):
     """download and check the packages needed for the transaction"""