On Wednesday 25 July 2018 16:15:03 Mark Morgan Lloyd wrote: > On 25/07/18 19:00, Gene Heskett wrote: > > On Wednesday 25 July 2018 07:22:46 Mark Morgan Lloyd wrote: > > > > I have not been successfull at "make pdfdocs", it hits something it > > doesn't like in the chapter on networking, not finding a file that > > is (or was) installed since this is now armbian, and which an > > apt-file find pdftex returns 262 versions of it as available. But > > which is the correct version? $64k question, that. Lots of stuff > > missing for make pdfdocs, not working yet and apt has drug in close > > to a gigabyte of stuff. And apt can't find half of what it wants > > even then. But it may have succeeded, now installing okteta, and > > okular another 150 megs of dependencies that pulls in for each. > > That's something I've never tried I'm afraid, and I suspect that most > people use an online one. > > However if you really do need to do that I suggest looking at the > manpage for make, since knowing exactly what command was being run > would probably help you a lot. > > > But lastly, because I've made some real progress, I need to make an > > image backup of / but without the contents of /media/slash because > > that is where I'll put the "backup". How the heck do I do that? And > > what command is used to image the sd to the eMMC? Then I'll see if > > it will boot from the eMMC, then have make make the debs. Seems > > like a logical order anyway... > > Really depends what you mean by an "image backup". I do a lot of stuff > using "ye olde traditional" dd, either between devices or more often > making an image of the entire device (i.e. including partition table > etc.) to a file and manipulate it there (e.g. by deleting a directory > tree /after/ the data has been copied). > > However when using something like dd there's a major problem: you > either want the storage medium to be removed so you can copy the > filesystems offline, or you need to shut every possible piece of > running software down (including things like your SSH daemon) so that > nothing's writing to the disc when you're trying to copy it. Needless > to say the same considerations apply when using dd to do a > sector-by-sector copy from one device to another. > > That would normally be done by putting the system into single user > mode, and traditionally that was done using something like the > telinit 1 command... and it was that that I complained about at the > start of this thread, since I suspect it was responsible for killing > an SDCard in a TinkerBoard. > > There are still ways of working round that sort of problem. For > example, you can copy an entire device using dd to capture boot > segments and partition layout, inspect and recreate the filesystems > using mkfs, then use [something] to copy files one at a time into the > new filesystems taking care that some bootloaders need a wakeup call > when a file moves. > > As far as "something" is concerned: > > dd: Sector-by-sector copy between devices and files. > tar: Good ol' archiver, with directory-exclude etc. options. > netpipes: Do a tar or dd over the LAN. > rsync: File-by-file copy over LAN. > rdist: Ditto, less well-known but with some good points.
I'll have to look at that. I need dd like copies, but I don't want /media/slash to be anything but an empty dir in the image it makes. > parted: Resize a partition. > resize2fs: Resize a filesystem contained in a partition. > > So in combination, a fairly common use case would be to dd an entire > device to a file, resize2fs the final filesystem to its minimum size, > parted to reduce the final partition to its minimum size, dd to put > the file onto a new device (noting that even if the size is nominally > the same, it's common for it to be smaller by a piffling few 100s of > Mb hence the palaver of resizing) and finally expand the final > partition and its included filesystem to fit. > > I've done rather a lot of that sort of thing, it's very much "old > school". And like everybody else, on at least one occasion I've got > the dd parameters wrong and roached something I really wanted to keep. Got the t-shirt and wore it out myself. ;-) Sometimes the recovery has been a cast iron bitch. I'm almost afraid to putz with the r-pi-3b as its working better these days. Now if I could just figure out how to fix the ssh logins. I think I'll go run synaptic and reinstall that ssh kit. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene>
