Roundtable

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Re: [RndTbl] Roundtable Digest, Vol 218, Issue 12
by Brock Wolfe 26 Mar '23

26 Mar '23

I have had more time to look around a bit, and see that what I'am looking for is classed as a "No/Low Code App Development" platform. Companies of course wish customers to use and implement new apps as cloud based apps, but some will support self-hosted instances of their platforms. Some commercial and open source examples include but not limited to, are: Retool Openblocks Joget ToolJet appsmith A recurring theme is the platform distribution and self hosting via Docker instances rather than a traditional software installation or Build process onto the native OS. Further comments welcome on No/Low Code App development platforms and the use of Docker for DEV and PROD self-hosted installations. Brock On 2023-03-26 12:00, roundtable-request(a)muug.ca wrote: > Send Roundtable mailing list submissions to > roundtable(a)muug.ca > > To subscribe or unsubscribe via the World Wide Web, visit > https://muug.ca/mailman/listinfo/roundtable > or, via email, send a message with subject or body 'help' to > roundtable-request(a)muug.ca > > You can reach the person managing the list at > roundtable-owner(a)muug.ca > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Roundtable digest..." > > > Today's Topics: > > 1. Rapid prototyping of multi-user database for LAN/Server > environment (Brock Wolfe) > 2. Re: Rapid prototyping of multi-user database for LAN/Server > environment (Troy Denton) > 3. Re: Rapid prototyping of multi-user database for LAN/Server > environment (Trevor Cordes) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 25 Mar 2023 18:56:27 -0500 > From: Brock Wolfe <obwolfe(a)shaw.ca> > To: roundtable(a)muug.ca > Subject: [RndTbl] Rapid prototyping of multi-user database for > LAN/Server environment > Message-ID: <e112ebe2-c270-ac22-76a6-75415d1cdea1(a)shaw.ca> > Content-Type: text/plain; charset="utf-8"; Format="flowed" > > I am looking for a software platform for prototyping a multi-user > database, hosted in a LAN/Server network. > > The primary focus is on rapid prototyping of the databases, forms, > screens, reports, etc.? over scalable and production grade software > platform suite (ie. LAMP) > > A little looking around, and I found the similar LibreOffice BASE and > HyperSQL (www.hsqldb.org). > > Any suggestions, recommendations? > > Thank you in advance for the help. > > Regards > > Brock >

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Rapid prototyping of multi-user database for LAN/Server environment
by Brock Wolfe 26 Mar '23

26 Mar '23

I am looking for a software platform for prototyping a multi-user database, hosted in a LAN/Server network. The primary focus is on rapid prototyping of the databases, forms, screens, reports, etc. over scalable and production grade software platform suite (ie. LAMP) A little looking around, and I found the similar LibreOffice BASE and HyperSQL (www.hsqldb.org). Any suggestions, recommendations? Thank you in advance for the help. Regards Brock

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EAC equivalent for Linux - found! (more or less)
by Adam Thompson 25 Mar '23

25 Mar '23

I, and I know a few of you, have long been looking for an equivalent tool under Linux to Windows’ Exact Audio Copy. I just stumbled upon a new (to me) possible contender: Whipper. Source at: GitHub - whipper-team/whipper: Python CD-DA ripper preferring accuracy over speed<https://github.com/whipper-team/whipper> Binaries appear to mostly be in your distro’s repos? Or so the github page reports, at least. It does use the new-ish libcdparanoia to do the ripping, under the hood – it seems that product has matured and more or less reached parity with EAC. I have not tried this yet, so I can’t vouch for its quality relative to EAC, but it’s apparently popular enough that MusicBrainz’ Picard has specific support for its logfiles. For proprietary-Darwin fans, the equivalent there now appears to be X Lossless Decoder: Lossless audio decoder for Mac OS X (undo.jp)<https://tmkk.undo.jp/xld/index_e.html>. YMMV. -Adam

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Unix at 25
by Gilbert Detillieux 14 Mar '23

14 Mar '23

What? Don't you mean 52? (Or actually almost 54 by now?) So, back in 1994, Peter H. Salus wrote a book "A Quarter Century of Unix", and then an article with the title "Unix at 25" for the October 1994 issue of Byte Magazine. At the in-person MUUG meeting last week, one of the give-aways was a print edition of that issue of Byte. For those who are sad they missed out in this prized issue, here's an electronic copy of the Salus article... https://www.landley.net/history/mirror/unix/art3.htm And for those interested in a copy of his book (either purchasing a print copy, or downloading the PDF), you can find out more about it here... https://wiki.tuhs.org/doku.php?id=publications:quarter_century_of_unix ... along with other historical Unix publications here... https://wiki.tuhs.org/doku.php?id=publications:start Enjoy the trip down memory lane! Gilbert -- Gilbert Detillieux E-mail: Gilbert.Detillieux(a)umanitoba.ca Computer Science Web: http://www.cs.umanitoba.ca/~gedetil/ University of Manitoba Phone: 204-474-8161 Winnipeg MB CANADA R3T 2N2 For best CS dept. service, contact <cs-support(a)lists.umanitoba.ca>.

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HDMI extenders
by Kevin McGregor 11 Mar '23

11 Mar '23

Here's another question I was going to ask at the meeting but forgot about. It's not UNIX/Linux-related but I was hoping for some input. Does anyone have experience with HDMI-over-Ethernet extenders? Do they work? Do the less-expensive ones work? :-) Should I just get a really long HDMI cable? What's the upper length limit for HDMI cables (1080p)? It would be under 50 ft.

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intel-media-driver with Intel 1165G7 and Rocky 9
by Chris Audet 04 Mar '23

04 Mar '23

@Alberto just a quick follow up from last meeting, you had suggested installing the official Intel driver to get the most out of this CPU. I installed as per this kb <https://rpmfusion.org/Howto/Multimedia>, everything seems OK (it shows up installed because I ran it again as an example, forgot to copy the output first time): [root@what ~]# dnf install intel-media-driver Last metadata expiration check: 2:11:34 ago on Wed 15 Feb 2023 03:49:21 PM. Package intel-media-driver-21.1.3-1.el9.x86_64 is already installed. Dependencies resolved. Nothing to do. Complete! Only thing I was wondering was how to verify that the OS is actually using the newly installed driver. After reboot, the Gnome settings app is reporting "Mesa Intel® Xe Graphics (TGL GT2)", I'm not 100% sure but I think that's what it was displaying before the install as well. In any case I'll keep using it and will report back if anything exciting happens. Thanks for the tip 🙂

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MUUG Meeting, Tuesday, Mar 7, 7:30pm (Date Change, In-person Meeting) -- KVM without a GUI
by Gilbert Detillieux 28 Feb '23

28 Feb '23

The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting IN PERSON, on Tuesday, March 7th, at 7:30pm. Yes, that's a week early, i.e. the FIRST Tuesday of the month... KVM without a GUI - Have you lost your head? Linux KVM (Kernel-Based Virtual Machine) is a full virtualization solution for Linux, using hardware accelerated virtualization extensions to provide near physical performance. New users of KVM may find the command line interface daunting and difficult to understand. Even the majority of KVM tutorials online rely on the GUI to do the initial installation and setup of your virtual machines, but what if we don't have a GUI? As Linux admins, we are accustomed to doing most of our work in a remote terminal, most of our servers don't even have a keyboard or monitor plugged in, and are located in remote data centers. In this presentation, Wyatt Zacharias will present the basics of how to use the KVM command line tools to create and setup a new virtual machine from scratch. Where to find the Meeting: Fortress Software Inc., 350 Keewatin St -- Unit #2 We have a new in-person meeting location now! Brad Vokey has graciously let us use his work office for our next in-person meeting. The meeting room will be open by 7:00 pm, with the actual meeting starting at 7:30 pm. If driving, enter the lot using the most north east entrance and drive around to the south west corner of the building (see route in map detail on poster linked below). You can use any of the free, amble, and safe parking spots that say "reserved" in front of units #1 through #4 before entering unit #2. Bus stops #30814 and #30880 (route 77) are only 150 meters away. The last bus leaves for Polo Park at 10:15 pm and for Garden City at 10:31 pm. Logan Ave. bus routes #19, #26, and #27 are a 600 meter (8 minute) walk to the south. For those unable or preferring not to attend in person, the meeting will also be available online, using BBB as usual. Stay tuned to our muug.ca home page for the official URL, which will be made available about a half hour before the meeting starts. (Reload the page if you don't see the link, or if there are issues with connecting.) *Date Change* Please note the change in meeting date for this month, and for the rest of the current year (at least until the July/August break). We are now meeting on the first Tuesday of each month. The group now holds its meetings at 7:30pm on the *first* Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. For more information about MUUG, and its monthly meetings, check out their web server: https://muug.ca/ Help us promote this month's meeting, by putting this poster up on your workplace bulletin board or other suitable public message board, or linking to it on social media: https://muug.ca/meetings/MUUGmeeting.pdf -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.ca> Manitoba UNIX User Group Web: http://muug.ca/

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shell quoting inside $( )?
by Adam Thompson 28 Feb '23

28 Feb '23

I’m trying to figure out if there’s a way to do this more compactly (for reasons…): T=$(openssl x509 -noout -text -in "$1") EXPD=$(date -d"$(echo "$T" | sed -n 's/^.*Not After : //p')" +%Y%b%d) SUBJ=$(echo "$T" | sed -n 's/^.*Subject: .*CN = //p') I am having two issues: 1. Bash doesn’t happily let me embed double quotes inside a subshell inside a subshell inside double-quotes. All of the double-quotes are required, AFAICT. So doing X=$(…”$(…”xxx”)”) just doesn’t work because bash doesn’t parse nested double-quotes. But both the inner var and the result can and will have spaces in them. 2. I can’t remember how in shell (bash, in this case) how to bifurcate stdout and have it run to two pipelines. I figure echo is a builtin, so should at least be lighter than re-running the monstrosity that is openssl over and over. I have a vague recollection that this is harder than it sounds, and may not be worth it… Any suggestions on how to solve either issue? I’m sure I’ve just forgotten some obvious technique, hopefully someone can jog my mind. -Adam

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DOCTYPE holy smokes
by Trevor Cordes 25 Feb '23

25 Feb '23

File this under wacky !#%* bug that takes 1 hour to solve and you're #*%@# lucky you solved it... I have some javascript that takes a textarea and turns it into arrays of GSM-7 chars for SMS texting purposes. Based on the nice (FLOSS) online SMS calculator: https://twiliodeved.github.io/message-segment-calculator/ If I input a space (unicode hex code 0x20, same as ascii) in the above page, it'd show up as one GSM-7 codepoint 0x0020. But if I input it in my version of a similar calculator it would always come out as 2 spaces! 0x0020 0x0020 Was I inputting a NBS by accident (which "smart" encoding changes to 2 spaces)? No. Was the js library at fault? Debugging an hour later, probably not. While watching the js debug box in FF I noticed it moaning every page load about the page being loaded in "quirks mode" because of my DOCTYPE first line of all my HTML. With nothing else left to blame it on, I went and changed my DOCTYPE (which is from the first days of my program: 2010ish) to what FF suggests when you click on the quirk (basically eliminating the "transitional" stuff). Boom. Bug goes away. One space is now one space. Doh. Now my curiosity is wondering why a quirk mode needs to double all the spaces to maintain compatibility with something somewhere... That's probably a long story by itself. I'm lucky I even solved this one, as that seemed an unlikely culprit as I've literally never had any issue using my ancient DOCTYPE and IIABDFI. On the downside, I probably just broke my program for all ancient-browser users. Oh well. P.S. GSM-7 char encoding is really really @#*%&ed up. Whoever came up with that travesty should be flogged.

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Fw: [SECURITY] Fedora 36 Update: openssl-3.0.8-1.fc36
by Trevor Cordes 23 Feb '23

23 Feb '23

Oh joy, "password timing" attacks come to SSL. e.g. CVE-2022-4304 Published 2023-02-08T20:15:00 A timing based side channel exists in the OpenSSL RSA Decryption implementation which could be sufficient to recover a plaintext across a network in a Bleichenbacher style attack. Begin forwarded message: Date: Wed, 22 Feb 2023 11:09:09 +0000 (GMT) From: updates(a)fedoraproject.org To: package-announce(a)lists.fedoraproject.org Subject: [SECURITY] Fedora 36 Update: openssl-3.0.8-1.fc36 -------------------------------------------------------------------------------- Fedora Update Notification FEDORA-2023-a5564c0a3f 2023-02-22 11:06:32.699863 -------------------------------------------------------------------------------- Name : openssl Product : Fedora 36 Version : 3.0.8 Release : 1.fc36 * Thu Feb 9 2023 Dmitry Belyavskiy <dbelyavs(a)redhat.com> - 1:3.0.8-1 - Rebase to upstream version 3.0.8 Resolves: CVE-2022-4203 Resolves: CVE-2022-4304 Resolves: CVE-2022-4450 Resolves: CVE-2023-0215 Resolves: CVE-2023-0216 Resolves: CVE-2023-0217 Resolves: CVE-2023-0286 Resolves: CVE-2023-0401

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