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Android / fastboot / ROM problem
by Evan Leibovitch 25 Jun '19

25 Jun '19

Hi all. I'm trying to determine if my Nexus 7 tablet (original 2012 version) is toast or can be fixed by software. Since its OS stopped being upgraded in 2015, I'd installed LineageOS on it some time ago. A few months ago when I went to upgrade, the install from TWRP didn't take and it just bootlooped on the Lineage animation about 15 seconds in. After trying a bunch of things I decided to just erase the whole thing and take it to factory settings. So, using these instructions <https://developers.google.com/android/images#nakasi>, I downloaded the factory ROM and tried to install. Here's what happened when executing the supplied install script: fastboot oem unlock (bootloader) Bootloader is already unlocked OKAY [ 0.015s] finished. total time: 0.015s fastboot erase boot erasing 'boot'... OKAY [ 0.015s] finished. total time: 0.015s fastboot erase cache ******** Did you mean to fastboot format this ext4 partition? erasing 'cache'... OKAY [ 0.015s] finished. total time: 0.015s fastboot erase recovery erasing 'recovery'... OKAY [ 0.015s] finished. total time: 0.015s fastboot erase system ******** Did you mean to fastboot format this ext4 partition? erasing 'system'... OKAY [ 0.015s] finished. total time: 0.015s fastboot erase userdata ******** Did you mean to fastboot format this ext4 partition? erasing 'userdata'... OKAY [ 0.026s] finished. total time: 0.026s fastboot -w update image-nakasi-ktu84p.zip target didn't report max-download-size sending 'bootloader' (2100 KB)... OKAY [ 0.262s] writing 'bootloader'... OKAY [ 0.601s] finished. total time: 0.863s rebooting into bootloader... OKAY [ 0.015s] finished. total time: 0.065s extracting android-info.txt (0 MB)... extracting boot.img (4 MB)... target didn't report max-download-size archive does not contain 'boot.sig' archive does not contain 'dtbo.img' archive does not contain 'dt.img' extracting recovery.img (5 MB)... archive does not contain 'recovery.sig' extracting system.img (628 MB)... archive does not contain 'system.sig' archive does not contain 'vbmeta.img' archive does not contain 'vendor.img' wiping userdata... Couldn't parse erase-block-size '0x'. Couldn't parse logical-block-size '0x'. mke2fs 1.44.6 (5-Mar-2019) /tmp/TemporaryFile-fnXNLB: Unimplemented ext2 library function while setting up superblock /usr/lib/android-sdk/platform-tools/mke2fs failed with status 1 mke2fs failed: 1 error: Cannot generate image for userdata Does this mean I have a hardware problem? I suspect if it is, the fix will be well more than the tablet is worth. Well, at least I know it's *probably* been wiped of any useful data, And yes, I've tried multiple ports, cables images and even systems. Thanks! -- Evan Leibovitch, Toronto Canada @evanleibovitch or @el56

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A find alternative: fselect
by Christopher Browne 20 Jun '19

20 Jun '19

Having recently been at a database conference, somewhere along the line, someone pointed out this tool, "fselect", which is basically what you get if you take /usr/bin/find, and change it to have a command line that looks like SQL rather than the odd-ish find arguments: https://github.com/jhspetersson/fselect $ fselect path, size from ~/Downloads where size gt 30mb order by size desc limit 25 /home/cbbrowne/Downloads/flyway-commandline-4.0.3-linux-x64.tar.gz 53991744 /home/cbbrowne/Downloads/HP41C.pdf 53174535 /home/cbbrowne/Downloads/Tai chi/WuDang sword.mp3 44784426 /home/cbbrowne/Downloads/civic-manual-2019.PDF 42192497 /home/cbbrowne/Downloads/HP-41CXOwnersManualVol1.pdf 39603314 Hmm. Looks like there's some crud I might want to get rid of, and a few calculator manuals :-) FYI, fselect is written in Rust, and has a goodly number of ("painfully large number of") dependencies, quasi-self-managed via the Rust-oriented dependency tool, Cargo. The dependency description is pretty commendable; it is pretty decently self-descriptive. See: https://github.com/jhspetersson/fselect/blob/master/Cargo.toml Using fselect to search for things is, I suppose, my experiment of the month. Will see how it grows on me. The output is intended to be human readable moreso than machine readable. (That said, how many of us still use /usr/bin/find to generate input for cpio???) -- When confronted by a difficult problem, solve it by reducing it to the question, "How would the Lone Ranger handle this?"

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[GTALUG-Announce] Lightning Talks
by hi＠gtalug.org 19 Jun '19

19 Jun '19

<https://gtalug.org/meeting/2019-07/> # Lightning Talks Lighting Talks is GTALUG's version of an un-conference, a loosely structured short talks emphasizing the informal exchange of information and ideas between participants, rather than following a conventionally structured GTALUG meetings. If you already have a topic in mind please send an email speakers(a)gtalug.org to be added to the list of scheduled talks. If you would like to give a talk during the meeting, all you have to do is write your name on a post-it and stick it on the whiteboard in the front of the room. When your talk gets selected, you will have five to present your idea, then five minutes of audience questions. ## Location George Vari Engineering and Computing Centre 245 Church Street, Room 203 Ryerson University <https://goo.gl/maps/16oJ2> <https://www.openstreetmap.org/way/23447525> ## Schedule * 6:00 pm - Please discuss on the general mailing list (i.e. <talk(a)gtalug.org>) where you want to go for dinner. * 7:30 pm - Meeting and presentation. * 9:00 pm - After each meeting, a group of GTALUGers move to The Imperial Pub (54 Dundas St East) for refreshments and more socialising. # Code of Conduct We want a productive happy community that can welcome new ideas, improve every process every year, and foster collaboration between individuals with differing needs, interests and skills. We gain strength from diversity, and actively seek participation from those who enhance it. This code of conduct exists to ensure that diverse groups collaborate to mutual advantage and enjoyment. We will challenge prejudice that could jeopardise the participation of any person in the community. The Code of Conduct governs how we behave in public or in private whenever the Linux community will be judged by our actions. We expect it to be honoured by everyone who represents the community officially or informally, claims affiliation or participates directly. It applies to activities online or offline. We invite anybody to participate. Our community is open. Please read more about the GTALUG Code of Conduct here: <https://gtalug.org/about/code-of-conduct/>. If you have any questions, comments, or concerns about the GTALUG Code of Conduct please contact the GTALUG Board @ <board(a)gtalug.org>. --- GTALUG Announce mailing list announce(a)gtalug.org https://gtalug.org/mailman/listinfo/announce

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Calling all networking and SVN gurus
by Giles Orr 11 Jun '19

11 Jun '19

To forestall the inevitable suggestion: no, the solution is not to move to git. At least not yet: for various reasons, it can't happen right now. This is the last holdout, all our other repos are already git. I apologize for the length of this dissertation: I've been doing my homework as fast as I can, and I want to provide complete information. I've just moved a previously semi-local (different building but "on campus") SVN server to a cloud instance (running Debian, SVN 1.9.5, and Apache 2.4.25, access via https://). For the most part it went smoothly, but now our "on campus" Jenkins server intermittently loses the network connection on 'svn up' so the deploy fails. That's bad. What's far worse is that while Jenkins initially resumed these broken updates politely when the deployment was re-run, it's now decided that these resumes have left a locked workspace and it has to do a fresh checkout. One of the problems with moving this repository to git is that SVN trunk is ~5G in size: a checkout to a local client takes 5-10 minutes, but for some reason a Jenkins checkout takes about 30 minutes (this is all pretty new to me, and I haven't had time to investigate that time difference yet). An update takes a 60 seconds, but a new checkout takes 30 minutes - you can see where that causes delays in deployment. One possible mitigation is to trap the SVN failure, do a clean-up on the directory and re-run. I may have to try this, but ... that's just mitigation, not a solution. The Jenkins server is on Windows (I wasn't given a choice) and mostly works well. It uses Cygwin for all the SVN stuff (SVN version 1.11.x). It's also at a different physical location from me with different network rules. The critical lines of the failure error: org.tmatesoft.svn.core.SVNException: svn: E175002: Connection reset svn: E175002: REPORT request failed on '/svn/repo/!svn/vcc/default' (It being Java, the errors run to 40 or 50 lines: I think this is the only part that's important.) Unfortunately, this is one of those errors that Google searches produce lots of questions, lots of speculations ... and no solid answers. At least not that I've found. Likewise, a lot of people want to know, as I did, about the relatively unusual filepath ("!svn/vcc/default") but I've never seen a solid answer as to what that's about either. The logs show Jenkins requests against that filepath with both REPORT and PROPFIND, but Jenkins is only failing on REPORT. Both of these request types are WebDAV extensions. Our staff don't seem to be having any trouble checking out or updating the repository across a mix of Windows and Mac clients. I've so far failed at getting more logging out of SVN and Apache: what I do have doesn't tell me much useful, at least not related to these failures. This problem is intermittent and infrequent. I'm thinking the next step is network sniffing - although I'm hoping someone can suggest something better. I'm relatively inexperienced with Wireshark and tcpdump (and SVN ...), but what experience I do have suggests all I'm going to get is to learn that SVN stopped providing data without finding out why or how to fix it. Any suggestions welcomed, thanks. -- Giles https://www.gilesorr.com/ gilesorr(a)gmail.com

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POP3 vs IMAP
by o1bigtenor 11 Jun '19

11 Jun '19

Greetings Working on setting up Claws - - an email handling tool and I need to choose whether I use POP3 or IMAP. What I've been able to find so far doesn't really give any kind of clear direction. I have lots of storage here and am planning on starting with my least used addresses just to make sure things are working well before I do a complete switch. Please advise. TIA

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[GTALUG-Announce] Meeting Tomorrow at 7:30pm
by hi＠gtalug.org 10 Jun '19

10 Jun '19

<https://gtalug.org/meeting/2019-06/> # MyRocks 101 You may have heard about MyRocks, the new implementation of log structured merge indexing via RocksDB for MySQL But what is it? How does it work? What’s it good for? What is this thing called compaction? In this session we’re going to explore the high level mechanics as well as common system variables, column family options, and associated metrics so that you’ll have the familiarity you need for this emerging storage engine. ## Location George Vari Engineering and Computing Centre 245 Church Street, Room 203 Ryerson University <https://goo.gl/maps/16oJ2> <https://www.openstreetmap.org/way/23447525> ## Schedule * 6:00 pm - Please discuss on the general mailing list (i.e. <talk(a)gtalug.org>) where you want to go for dinner. * 7:30 pm - Meeting and presentation. * 9:00 pm - After each meeting, a group of GTALUGers move to The Imperial Pub (54 Dundas St East) for refreshments and more socialising. # Code of Conduct We want a productive happy community that can welcome new ideas, improve every process every year, and foster collaboration between individuals with differing needs, interests and skills. We gain strength from diversity, and actively seek participation from those who enhance it. This code of conduct exists to ensure that diverse groups collaborate to mutual advantage and enjoyment. We will challenge prejudice that could jeopardise the participation of any person in the community. The Code of Conduct governs how we behave in public or in private whenever the Linux community will be judged by our actions. We expect it to be honoured by everyone who represents the community officially or informally, claims affiliation or participates directly. It applies to activities online or offline. We invite anybody to participate. Our community is open. Please read more about the GTALUG Code of Conduct here: <https://gtalug.org/about/code-of-conduct/>. If you have any questions, comments, or concerns about the GTALUG Code of Conduct please contact the GTALUG Board @ <board(a)gtalug.org>. --- GTALUG Announce mailing list announce(a)gtalug.org https://gtalug.org/mailman/listinfo/announce

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[GTALUG-Announce] MyRocks 101
by hi＠gtalug.org 09 Jun '19

09 Jun '19

<https://gtalug.org/meeting/2019-06/> # MyRocks 101 You may have heard about MyRocks, the new implementation of log structured merge indexing via RocksDB for MySQL But what is it? How does it work? What’s it good for? What is this thing called compaction? In this session we’re going to explore the high level mechanics as well as common system variables, column family options, and associated metrics so that you’ll have the familiarity you need for this emerging storage engine. ## Location George Vari Engineering and Computing Centre 245 Church Street, Room 203 Ryerson University <https://goo.gl/maps/16oJ2> <https://www.openstreetmap.org/way/23447525> ## Schedule * 6:00 pm - Please discuss on the general mailing list (i.e. <talk(a)gtalug.org>) where you want to go for dinner. * 7:30 pm - Meeting and presentation. * 9:00 pm - After each meeting, a group of GTALUGers move to The Imperial Pub (54 Dundas St East) for refreshments and more socialising. # Code of Conduct We want a productive happy community that can welcome new ideas, improve every process every year, and foster collaboration between individuals with differing needs, interests and skills. We gain strength from diversity, and actively seek participation from those who enhance it. This code of conduct exists to ensure that diverse groups collaborate to mutual advantage and enjoyment. We will challenge prejudice that could jeopardise the participation of any person in the community. The Code of Conduct governs how we behave in public or in private whenever the Linux community will be judged by our actions. We expect it to be honoured by everyone who represents the community officially or informally, claims affiliation or participates directly. It applies to activities online or offline. We invite anybody to participate. Our community is open. Please read more about the GTALUG Code of Conduct here: <https://gtalug.org/about/code-of-conduct/>. If you have any questions, comments, or concerns about the GTALUG Code of Conduct please contact the GTALUG Board @ <board(a)gtalug.org>. --- GTALUG Announce mailing list announce(a)gtalug.org https://gtalug.org/mailman/listinfo/announce

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GNU Cauldron for GCC This Year
by nick 09 Jun '19

09 Jun '19

Greetings All, I was wondering if anyone else here is attending the GNU Cauldron this year for GCC. Just a little curious as seems I got a grant for it as a student and I know there is one or two other compiler developers in the group if I'm correct. Nick

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war story: fixing an LCD TV
by D. Hugh Redelmeier 07 Jun '19

07 Jun '19

My 39" UltraHD TV, the one that I used as my main computer monitor for almost four years, stopped working. The symptom was that it just would not turn on. The status light below the screen stayed red, meaning something like "standby". Normally it turns blue when I'm using it. Googling and watching YouTube videos convinced me that there was a chance that I could repair it. LCDs seem to have certain standard PC boards. - T-Con (timing control) - power supply - processor - LED light & video driver Replacement boards are reasonably inexpensive, apparently from chop shops (i.e. they buy broken TVs and sell the working parts). This shows someone fixing my model of TV. <https://www.youtube.com/watch?v=XD7rIEgYULI> >From my research, it seemed as if the most likely problem would involve the power supply module. I could get one for US$~20 + ~$20 for shipping. I opened up the monitor and examined the entrails. There was a burnt spot on the power supply board. I posted my problem to the BadCaps.com forum and got encouragement that a little bit of solder would fix the board. I tried this, and it worked. At least for now. I'm using the monitor to compose this mail. <https://www.badcaps.net/forum/showthread.php?p=898646> I spent several hours researching and perhaps an hour disassembling, soldering, and reassembling. It might not have been worth that time given the value of the monitor ($350 original price, but used for 4 years and obsolete). I find it satisfying to fix a hardware problem, even though I'm a software guy. Summary: not all hardware problems are hard.

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[OT] mySQL help
by Stephen 04 Jun '19

04 Jun '19

I am not on any lists for mysql. So I thought that I would ask her, Suggestions for a help list for mysql are most welcome. I have a LAMP for web site development and rarely need to touch the database admin stuff. It has been years. I am creating a new site with database but I can't get the user to have privileges. Can anyone spot what is wrong? So I connect to the server with: stephen@Avalon:~$ mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 11 Server version: 5.7.26-0ubuntu0.18.04.1 (Ubuntu) Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> =========================================== I create grants mysql> grant all on rois3324_stephen.* to "rois3324_stephen"@"localhost" with grant option; Query OK, 0 rows affected (0.00 sec) =========================================== I try to see grants mysql> "rois3324_stephen"@"localhost" -> It looks like no grants were created. And I get a confirming error from PHP. Can anyone see what is wrong? Thank you! -- Stephen

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