python – Is there way any way I can use a data url when operating under the URL validator restriction in flask-WTF?

When filling out an input in a form, one can place a URL validator on the given input to ensure the user enters in a properly formatted URL. This URL validator, however, does not account for the specific format of Data URLs. I was wondering if there was a method out there to make it account for a data URL, or will I just have to come up with a custom validator for the Data Url myself.

messages – Can I update my emoji set without updating my operating system?

I’m on OS 10.12, and because of some legacy software I’m running, I can’t upgrade. I have access to most emoji, but some of the newer icons, like 🥰, display as blank (e.g. in Messages) or as a box with a code inside (e.g. in Firefox).

Can I update my emoji set without updating my operating system?

air travel – COVID-19 find out how particular company is operating

As some of my flights has been canceled I’d like to find out how the companies are operating (easyJet, Smartwings, CSA, …). As they don’t put much information, is there a possibility to find how they operate from an external resource, e.g. ?

rooting – how to upgrade operating system of micromax E311 device for a novice user

I have Micromax E311 phone.
For some reason the settings of phone have become unreachable. So on the display I see icon with a mechanical gear on it but when I tap it then
I get a pop up Unfortunately, Settings has stopped.
I click Ok.
Then again same message pops up within a fraction of second this keeps happening then I restart the phone somehow and if I touch settings then same thing happens.If I don’t touch the settings icon there is no problem I can keep using the phone.
So I am not sure what is the OS in this phone my guess is it has been formatted to factory settings so it having Android 4.4.2 I read many tutorials about rooting the phone and installing custom ROM on it.Like

After rooting an Android phone, you can switch the operating system
ROM whenever you want. The rooting process removes the preinstalled
operating system on the Android phone, replacing it with a rooted
Android OS.

as given on

How to root any device

How to install custom rom

How To Install Custom ROM on Android

For my device flash rom

What I am confused with is to upgrade my device OS to android 10, first I should replace the ROM and then do “something” as mentioned on lot of forums or what exactly I should to to upgrade the OS of my phone.
I am very confused with all the tutorials available on internet.
I want to know simple steps in bullet points like

  • Step 1 change rom
  • Step 2 change this
  • Step 3 change that
  • Step 4 boot phone.

Meaning such a guideline will help me when I reading tutorials and I am getting confused with them.

bootcamp – Triple boot: “Missing operating system” on Windows 10 partition after Windows update

I have a triple booted MacBook Pro (using rEFInd as boot manager). Recently I selected “Update and shut down” when finishing up in Windows 10. Since then, rEFInd still offers Windows to boot from, but the system responds with “Missing operating system”. I’ve tried repairing using a Windows recovery USB according to the suggestion here, but 0 Windows installations are found.

I’ve also tried fixing the MBR using the methods discussed here, here, and here, but to no avail.

diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                 Apple_APFS Container disk1         490.0 GB   disk0s2
   3:                 Linux Swap                         10.0 GB    disk0s3
   4:           Linux Filesystem                         250.0 GB   disk0s4
   5:                 Apple_APFS Container disk2         250.0 GB   disk0s5

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +490.0 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh SSD           173.2 GB   disk1s1
   2:                APFS Volume Preboot                 23.0 MB    disk1s2
   3:                APFS Volume Recovery                507.2 MB   disk1s3
   4:                APFS Volume VM                      1.1 GB     disk1s4

/dev/disk2 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +ERROR      disk2
                                 Physical Store disk0s5

Partition 5 on disk0 used to be the Bootcamp install of Windows 10. Now it is on disk2.

    sudo gpt -r -vv show disk0
gpt show: disk0: mediasize=1000204886016; sectorsize=512; blocks=1953525168
gpt show: disk0: Suspicious MBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 1953525167
       start        size  index  contents
           0           1         MBR
           1           1         Pri GPT header
           2          32         Pri GPT table
          34           6         
          40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
      409640   957031248      2  GPT part - 7C3457EF-0000-11AA-AA11-00306543ECAC
   957440888    19531248      3  GPT part - 0657FD6D-A4AB-43C4-84E5-0933C84B4F4F
   976972136   488276496      4  GPT part - 0FC63DAF-8483-4772-8E79-3D69D8477DE4
  1465248632   488276496      5  GPT part - 7C3457EF-0000-11AA-AA11-00306543ECAC
  1953525128           7         
  1953525135          32         Sec GPT table
  1953525167           1         Sec GPT header

sudo fdisk /dev/disk0

Disk: /dev/disk0    geometry: 121601/255/63 (1953525168 sectors)
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec (     start -       size)
 1: EE    0   0   2 - 1023 254  63 (         1 - 1465248631) <Unknown ID>
*2: AF 1023 254  63 - 1023 254  63 (1465248632 -  488276496) HFS+        
 3: 00    0   0   0 -    0   0   0 (         0 -          0) unused      
 4: 00    0   0   0 -    0   0   0 (         0 -          0) unused

Any help is very much appreciated. I have files on the partition I’d really prefer not to lose.

The operating system of my iMac doesn’t run but I want to take a backup from Recovery OS or the terminal

My OS doesn’t run so I have to reinstall it. But I don’t have any backup from the Time Machine or iCloud (my fault). I don’t want to lose my information. I tried two different things.

First attempt

  1. Connect an external hard drive
  2. Run the Recovery OS
  3. Try to copy my information to the external hard drive

And here’s the problem, I can’t do that. It doesn’t give me any option to do it.

Second attempt

  1. Connect an external hard drive
  2. Run the Single User Mode
  3. Try to copy my information to the external hard drive with commands

And here’s the other problem. It doesn’t recognize the external hard drive. So I tried to mount it with diskutil, I could run that command with help in this forum. But I can’t use it. I tried to disable the SIP from the Recovery mode with csrutil disable but it appears me that is only available in Recovery mode. But I’M IN THE RECOVERY MODE.

Anyway, I don’t know if continue that way, or maybe there are other easier solutions to have my backup. Thank you!

operating system – How does Windows link specific files to specific thumbnails in the thumbnail cache?

According to Wikipedia:

Thumbnail caching was introduced in Windows 2000; wherein the thumbnails were stored in the image file’s alternate data stream if the operating system was installed on a drive with the NTFS file system.

Here, it’s clear that Windows used to associate thumbnail information directly with a file using its alternate data stream (on an NTFS file system). However, since Windows Vista:

…thumbnail previews are stored in a centralized location on the system… The cache is stored at %userprofile%AppDataLocalMicrosoftWindowsExplorer as a number of files with the label thumbcache_xxx.db (numbered by size); as well as an index used to find thumbnails in each sized database.

However, I have yet to find anywhere that explains how Windows associates individual thumbnails in the cache with specific files on the file system.

Does Windows associate the thumbnail image with the checksum of the file? It seems unlikely/nonoptimal because Windows would have to compute the checksum of every item in a folder (when accessed) if it wanted to properly display the correct thumbnails.

Does Windows use something lower level like the NTFS file ID of the file? But then how would it work on other file systems like FAT which don’t assign fixed file IDs?

I have yet to find any good answers so I would really appreciate any help I could get!

Dedicated servers with the possibility of installing the operating system in the control panel

I am looking for dedicated server providers who provide automatic installations of the operating system within their control panel.

Reduced software license … | Read the rest of

operating systems – How to find a condition that leads to a deadlock in non-reentrant locks

A multithreaded P program runs with x number of threads and uses y number of locks to ensure mutual exclusion while operating on shared memory locations. Not all program locks are reentrant, that is, if a thread has a l lock, it cannot reacquire l lock without releasing it. If a thread is unable to acquire a lock, it will hang until the lock is available. The minimum value of x and the minimum value of y together for which the execution of P can cause a deadlock are:

A. x = 1, y = 2
B. x = 2, y = 1
C: x = 2, y = 2
D: x = 1, y = 1

However, the answer is option D, but is there a possibility of having a deadlock in the other 3 options. If yes, then what is it because he is unable to view other options. Please explain.

recovery mode – Recovery from boot loop / cannot boot into Android-x86 operating system

I asked this question on Super User, but without luck or answer, and I was advised to post here, for help from Android specialists.

I installed several Android-x86 OSes, to play with them, and to test which one is best suited to my needs, Bliss OS, Prime OS, Phoenix OS …

I would like to know what is the safest way to play with build.prop for example.
If I break something and go into bootloop, it's tiring to reinstall every time.

I already had a bootloop because of the build.prop edition, and one because I tried to install Xposed. I had to reinstall because I don't know how to fix my system.

There is currently no recovery software or recovery mode for x86-based distributions. Not even an APK to test build.prop compliance, save it or leave the possibility of restoring it (surprisingly).

I have used the Android emulator before, like Memu, and it has very smart functionality to allow me to save my virtual machine session every time, make copies and export them.

So my question is how do I find a way to recover my system.

Can I try to repair a bootloop from a live CD with another system for example?
How to fix the boot loop by editing system files incorrectly (build.prop)? Can I do a script or something to automate the backup of important system files, as is the case on other systems (Windows recovery, Linux backup solutions …).

Or, at least, if no one is thinking about it, I wish I could save my configuration, so if I reinstall, I could at least recover my configuration.

I know how to save apk, I do it with Titanium and other tools, but what about the configuration