How do handlers work?

EastEriq · 11-03-2024, 03:01 PM

Motivated by https://www.mobileread.com/forums/sh...d.php?t=363115, I'm trying to figure out what is the mechanics by which a handler works on a given file. As is known, I can write in /mnt/ext1/system/config/handlers.cfg the default program associated to a given file, so that it will be opened with it when tapping; I can associate a given file extension to a list of programs in extensions.cfg, so that I get on long press a menu for choosing which of them opens it.
I then created a small script in /mnt/ext1/applications/ in order get more insight. My script reads

Code:

#!/bin/sh
dialog 1 "" "$* $0 $! $1 $@" "Ok"
 echo "$* $0 $! $1 $@" > /mnt/ext1/applications/handle.log

If I call this script from shell with or without command line arguments, I get the expected result, that is a dialog with some text and button labels. However, if I tap on a file associated to that script, I only see a hourglass for a second, and see get no new content in the dump file handle.log. What am I missing?

neil_swann80 · 11-06-2024, 11:33 AM

What does the relevant entry within extensions.cfg and/or handlers.cfg look like?

EastEriq · 11-07-2024, 04:43 PM

I was about to write "they look like they should", i.e. for instance in relevant lines
extensions.cfg

Code:

epub:@EPUB_file:1:handleacsm.app,koreader.app,eink-reader.app:ICON_EPUB

handlers.cfg:

Code:

/mnt/ext1/Digital Editions/Lucifero.epub:eink-reader.app
/mnt/ext1/Digital Editions/Malinverno.epub:handleacsm.app

Then I thought I understood what it was: my script (handleacsm.app) was in /mnt/ext1/applications/ which is not in $PATH, and it worked from command line only when I was calling it with its full path. I tried then to copy it in /mnt/secure/bin/ (which is in $PATH), but at no avail.
Finally it occurred to me that koreader.app is, instead, in /mnt/ext1/system/bin. And once the script is moved there it works as a handler...

From that I could speculate that the mechanism of adding additional handlers has something going on behind the scenes (for instance in the long-press pulldown menu the label "PB reader" is shown for eink-reader.app, but "koreader.app" and my "handleacsm.app" are shown with their filename), but whatever, I think I have now a first lead.

EastEriq · 11-08-2024, 07:05 AM

Thinking again at it, that /mnt/ext1/system/bin is in PATH for user applications must have been well known since a while. Maybe that is defined in some .rc file which I haven't located. I refound that I had already a number of tested applications installed there, like utelnetd, cr3-pb.app, epubinfo.app, sh_ivtools,app etc.
As for the OS doing some translation of the names, I remark that a) the name of eink-reader.app in the pulldown menu is localized; b) eink-reader_with_pdfium.app and eink-reader_with_rmsk.app don't appear to correspond to a binary of that name, maybe they are internally aliased to eink-reader.app + parameters.

11-03-2024, 03:01 PM	#1
EastEriq Groupie Posts: 199 Karma: 195502 Join Date: Jan 2018 Device: Cybook Orizon, PocketBook Touch HD	How do handlers work? Motivated by https://www.mobileread.com/forums/sh...d.php?t=363115, I'm trying to figure out what is the mechanics by which a handler works on a given file. As is known, I can write in /mnt/ext1/system/config/handlers.cfg the default program associated to a given file, so that it will be opened with it when tapping; I can associate a given file extension to a list of programs in extensions.cfg, so that I get on long press a menu for choosing which of them opens it. I then created a small script in /mnt/ext1/applications/ in order get more insight. My script reads Code: #!/bin/sh dialog 1 "" "$* $0 $! $1 $@" "Ok" echo "$* $0 $! $1 $@" > /mnt/ext1/applications/handle.log If I call this script from shell with or without command line arguments, I get the expected result, that is a dialog with some text and button labels. However, if I tap on a file associated to that script, I only see a hourglass for a second, and see get no new content in the dump file handle.log. What am I missing?

11-07-2024, 04:43 PM	#3
EastEriq Groupie Posts: 199 Karma: 195502 Join Date: Jan 2018 Device: Cybook Orizon, PocketBook Touch HD	I was about to write "they look like they should", i.e. for instance in relevant lines extensions.cfg Code: epub:@EPUB_file:1:handleacsm.app,koreader.app,eink-reader.app:ICON_EPUB handlers.cfg: Code: /mnt/ext1/Digital Editions/Lucifero.epub:eink-reader.app /mnt/ext1/Digital Editions/Malinverno.epub:handleacsm.app Then I thought I understood what it was: my script (handleacsm.app) was in /mnt/ext1/applications/ which is not in $PATH, and it worked from command line only when I was calling it with its full path. I tried then to copy it in /mnt/secure/bin/ (which is in $PATH), but at no avail. Finally it occurred to me that koreader.app is, instead, in /mnt/ext1/system/bin. And once the script is moved there it works as a handler... From that I could speculate that the mechanism of adding additional handlers has something going on behind the scenes (for instance in the long-press pulldown menu the label "PB reader" is shown for eink-reader.app, but "koreader.app" and my "handleacsm.app" are shown with their filename), but whatever, I think I have now a first lead. Last edited by EastEriq; 11-07-2024 at 04:51 PM.

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11-06-2024, 11:33 AM	#2
neil_swann80 0000000000101010 Posts: 5,887 Karma: 12981955 Join Date: Mar 2023 Location: An island off the coast of Ireland Device: PB632 [HD3]	What does the relevant entry within extensions.cfg and/or handlers.cfg look like?

11-08-2024, 07:05 AM	#4
EastEriq Groupie Posts: 199 Karma: 195502 Join Date: Jan 2018 Device: Cybook Orizon, PocketBook Touch HD	Thinking again at it, that /mnt/ext1/system/bin is in PATH for user applications must have been well known since a while. Maybe that is defined in some .rc file which I haven't located. I refound that I had already a number of tested applications installed there, like utelnetd, cr3-pb.app, epubinfo.app, sh_ivtools,app etc. As for the OS doing some translation of the names, I remark that a) the name of eink-reader.app in the pulldown menu is localized; b) eink-reader_with_pdfium.app and eink-reader_with_rmsk.app don't appear to correspond to a binary of that name, maybe they are internally aliased to eink-reader.app + parameters.

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