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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Apple’ Category

linux – How can I execute a series of commands in a bash subshell as another user using sudo? – Stack Overflow

Posted by jpluimers on 2021/03/31

Based on [WayBack] linux – How can I execute a series of commands in a bash subshell as another user using sudo? – Stack Overflow:

alias restart-spotlight-service-as-root="sudo bash -c 'echo stop;launchctl stop com.apple.metadata.mds;echo start;launchctl start com.apple.metadata.mds;echo started'"

The bold bits above sudo bash -c 'echo stop;launchctl stop com.apple.metadata.mds;echo start;launchctl start com.apple.metadata.mds;echo started' allow the commands between single quotes to executed in one new bash shell under sudo.

–jeroen

Posted in *nix, *nix-tools, Apple, bash, bash, Development, Mac OS X / OS X / MacOS, Power User, Scripting, Software Development | Leave a Comment »

flyover-reverse-engineering/README.md at master · retroplasma/flyover-reverse-engineering · GitHub

Posted by jpluimers on 2021/03/30

For my research list: [WayBack] flyover-reverse-engineering/README.md at master · retroplasma/flyover-reverse-engineering · GitHub

–jeroen

Posted in Apple, Development, Go (golang), Mac OS X / OS X / MacOS, Power User, Software Development | Leave a Comment »

MacOS “mds_stores” high CPU usage

Posted by jpluimers on 2021/03/15

I notices a high CPU usage, so searched for “mds_stores” – Google Search.

There I quickly found out this is the Spotlight indexer using a lot of CPU.

From that, it was easy to track down: I had added a second 4TB backup disk, but forgot to add it to the Spotlight indexing exclusion list, where you get by following these steps:

  1. Open “Preferences”
  2. Search for “Spotlight”
  3. Click on the “Privacy” button
  4. Click on the “+” button to add a new folder
  5. Browse to the top of the list inside your computer to find the volumes to exclude

Now it is on it:

Related: [WayBack] [FIXED] mds_stores Process Consuming High CPU Usage – MacMetric

–jeroen

Posted in Apple, Mac OS X / OS X / MacOS, Power User, SpotLight | Leave a Comment »

Redux: Mac OS X – Spotlight not finding many files: force a rescan solved it

Posted by jpluimers on 2021/02/22

I bumped into a case where none of the steps in Mac OS X – Spotlight not finding many files: force a rescan solved it helped.

The problem was that my SD card at  /Volumes/SanDisk400GB/ was not indexed any more, but the SSD was.

These steps solved it:

$ sudo mdutil -i off /Volumes/SanDisk400GB/
2019-02-25 16:32:47.097 mdutil[14810:3728038] mdutil disabling Spotlight: /Volumes/SanDisk400GB -> kMDConfigSearchLevelFSSearchOnly
    Indexing disabled.
$ sudo mdutil -i on /Volumes/SanDisk400GB/
/Volumes/SanDisk400GB:
    Indexing enabled. 
$ sudo mdutil -E /Volumes/SanDisk400GB/
/Volumes/SanDisk400GB:
    Indexing enabled. 
$ sudo mdutil -E /
/:
    Indexing enabled. 
$ sudo mdutil -p

I am not sure if any of these can be omitted.

An odd thing: sudo mdutil -s does not show any output on progress. It is too late now, but I suspect it requires a volume parameter, just like -i and -E require.

–jeroen

Posted in Apple, Mac OS X / OS X / MacOS, Power User | Leave a Comment »

Still looking for base64url decoding tools, both on-line and for MacOS homebrew

Posted by jpluimers on 2021/02/11

Remember the screenshot on the right from yesterdays post Kristian Köhntopp explaining theories?

In the end, I:

  1. saved that tweet
  2. in archive.is
  3. then took the screenshot image from there (see below)
  4. cut out the grey parts, then posted the middle part

I much more would have used the screenshot functionality of Google as described here by Terence Eden:

[WayBack] twitter – How to convert a tweet to image – Stack Overflow

Google has a secret screenshot API

For example, you can use it to get a screenshot of a tweet like this

https://www.googleapis.com/pagespeedonline/v1/runPagespeed?screenshot=true&strategy=mobile&url=https%3a%2f%2ftwitter.com%2fedent%2fstatus%2f661570680253755392

At the bottom of that JSON response, you’ll see

"screenshot": {
     "data": "_9j_4AAQSkZJRgAB.....=",
     "height": 569,
     "mime_type": "image/jpeg",
     "width": 320
 }

You will need to Base64 decode it using the URL and Filename safe alphabet.

That will give you a JPG screenshot of the Tweet.

I was hoping for an on-line way, so I followed [WayBack] Google’s Secret Screenshot API – Terence Eden’s Blog.

The blog post pointed me to a Python based script ([WayBack] Python-Twitter-Hacks/websiteScreenshot.py at master · edent/Python-Twitter-Hacks · GitHub) but had no online way.

So I tried out a few on-line things myself that failed:

Then I found out the script was just a proof of concept with hard coded URL and filename.

So I forked the repository, and fixed the script basing it on Python 3.

More on that next week.

Related:

  • [WayBack] RFC 4648 – The Base16, Base32, and Base64 Data Encodings: Base 64 Encoding with URL and Filename Safe Alphabet:
       The Base 64 encoding with an URL and filename safe alphabet has been
       used in [12].
    ...
       An alternative alphabet has been suggested that would use "~" as the
       63rd character.  Since the "~" character has special meaning in some
       file system environments, the encoding described in this section is
       recommended instead.
    ...
       This encoding may be referred to as "base64url".  This encoding
       should not be regarded as the same as the "base64" encoding and
       should not be referred to as only "base64". 
    ...
       This encoding is technically identical to the previous one, except
       for the 62:nd and 63:rd alphabet character, as indicated in Table 2.
    ...
             Table 2: The "URL and Filename safe" Base 64 Alphabet
    
         Value Encoding  Value Encoding  Value Encoding  Value Encoding
             0 A            17 R            34 i            51 z
             1 B            18 S            35 j            52 0
             2 C            19 T            36 k            53 1
             3 D            20 U            37 l            54 2
             4 E            21 V            38 m            55 3
             5 F            22 W            39 n            56 4
             6 G            23 X            40 o            57 5
             7 H            24 Y            41 p            58 6
             8 I            25 Z            42 q            59 7
             9 J            26 a            43 r            60 8
            10 K            27 b            44 s            61 9
            11 L            28 c            45 t            62 - (minus)
            12 M            29 d            46 u            63 _
            13 N            30 e            47 v           (underline)
            14 O            31 f            48 w
            15 P            32 g            49 x
            16 Q            33 h            50 y         (pad) =
    

–jeroen

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Posted in Apple, Development, Home brew / homebrew, Mac OS X / OS X / MacOS, Power User, Software Development, Web Browsers | Leave a Comment »

 
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