October 2012 - Pharo-dev - lists.pharo.org

Re: [Pharo-project] image format with shebang

by Sven Van Caekenberghe

On 16 Oct 2012, at 18:11, Yanni Chiu <yanni(a)rogers.com> wrote: > On 16/10/12 11:32 AM, Sven Van Caekenberghe wrote: >> >> line := '#!!/home/ubuntu/smalltalk/bin/CogVM -vm-display-null -vm-sound-null -plugins /home/ubuntu/smalltalk/bin/'. > > Is /home/ubuntu/smalltalk/bin/CogVM the executable binary or a shell script? It is the VM executable itself, like in the Pharo VMs the last couple of months. The strange thing is, the same line works from the shell itself.

Oct. 16, 2012

Re: [Pharo-project] image format with shebang

by David T. Lewis

On Tue, Oct 16, 2012 at 12:08:47PM -0400, Yanni Chiu wrote: > On 16/10/12 10:13 AM, David T. Lewis wrote: > > > >If you don't want to do it in the VM, you can do it with a shell script. > >Just make a 512 byte file that starts with the shebang line that you > >want to use, prepend it to the saved image file (with /bin/cat) and set > >file mode executable (chmod). > > [So why does "Reply" in Thunderbird now go to the sender, instead of the > newsgroup. Have to use "Followup".] > > Neat, that worked. I used: > > % mkfile 512 header > % vi -b header > % cat header my.image > myimage > % chmod +x myimage > % ./myimage > > Is it possible to combine the VM and image into a single file? > This would be ancient history, but check out #snapshot:embedded: in the VM for some clues. I know it has been done, but I don't know who did it or when. Dave

Oct. 16, 2012

Re: [Pharo-project] image format with shebang

by Yanni Chiu

On 16/10/12 11:32 AM, Sven Van Caekenberghe wrote: > > line := '#!!/home/ubuntu/smalltalk/bin/CogVM -vm-display-null -vm-sound-null -plugins /home/ubuntu/smalltalk/bin/'. Is /home/ubuntu/smalltalk/bin/CogVM the executable binary or a shell script?

Oct. 16, 2012

Re: [Pharo-project] image format with shebang

by Yanni Chiu

On 16/10/12 10:13 AM, David T. Lewis wrote: > > If you don't want to do it in the VM, you can do it with a shell script. > Just make a 512 byte file that starts with the shebang line that you > want to use, prepend it to the saved image file (with /bin/cat) and set > file mode executable (chmod). [So why does "Reply" in Thunderbird now go to the sender, instead of the newsgroup. Have to use "Followup".] Neat, that worked. I used: % mkfile 512 header % vi -b header % cat header my.image > myimage % chmod +x myimage % ./myimage Is it possible to combine the VM and image into a single file?

Oct. 16, 2012

Re: [Pharo-project] image format with shebang

by David T. Lewis

On Tue, Oct 16, 2012 at 05:32:57PM +0200, Sven Van Caekenberghe wrote: > > On 16 Oct 2012, at 16:13, David T. Lewis <lewis(a)mail.msen.com> wrote: > > > If you don't want to do it in the VM, you can do it with a shell script. > > Just make a 512 byte file that starts with the shebang line that you > > want to use, prepend it to the saved image file (with /bin/cat) and set > > file mode executable (chmod). > > Well, I tried on my Ubuntu server, and I could't get it to work. > > I have a Pharo 2.0 image and a little test script called run.st > > $ cat run.st > NonInteractiveTranscript stdout install. > ! > | webSocket | > webSocket := ZnWebSocket to: 'ws://localhost:8080/ws-echo'. > [ > webSocket sendMessage: 'Pharo Smalltalk using Zinc WebSockets'. > Transcript show: webSocket readMessage; cr ] ensure: [ webSocket close ]. > ! > Smalltalk quitPrimitive. > > I wrote another small Smalltalk script to generate the header (just to be sure) > > $ cat write-header.st > 'header.bin' asFileReference writeStreamDo: [ :stream | | line | > line := '#!!/home/ubuntu/smalltalk/bin/CogVM -vm-display-null -vm-sound-null -plugins /home/ubuntu/smalltalk/bin/'. > stream > binary; nextPutAll: line asByteArray; nextPut: 10; > nextPutAll: (ByteArray new: 511 - line size) ]. > ! > Smalltalk quitPrimitive. > > Now I have a 512 byte header that looks like this > > $ hexdump -C header.bin > 00000000 23 21 2f 68 6f 6d 65 2f 75 62 75 6e 74 75 2f 73 |#!/home/ubuntu/s| > 00000010 6d 61 6c 6c 74 61 6c 6b 2f 62 69 6e 2f 43 6f 67 |malltalk/bin/Cog| > 00000020 56 4d 20 2d 76 6d 2d 64 69 73 70 6c 61 79 2d 6e |VM -vm-display-n| > 00000030 75 6c 6c 20 2d 76 6d 2d 73 6f 75 6e 64 2d 6e 75 |ull -vm-sound-nu| > 00000040 6c 6c 20 2d 70 6c 75 67 69 6e 73 20 2f 68 6f 6d |ll -plugins /hom| > 00000050 65 2f 75 62 75 6e 74 75 2f 73 6d 61 6c 6c 74 61 |e/ubuntu/smallta| > 00000060 6c 6b 2f 62 69 6e 2f 0a 00 00 00 00 00 00 00 00 |lk/bin/.........| > 00000070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| > * > 00000200 > > Then I concatenate the header and the working image > > cat header.bin zinc.image > magic.image > > and I copy the changes and make the image executable. > > The image still works > > $ /home/ubuntu/smalltalk/bin/CogVM -vm-display-null -vm-sound-null -plugins /home/ubuntu/smalltalk/bin/ magic.image run.st > Pharo Smalltalk using Zinc WebSockets > > But not when run directly > > $ ./magic.image > Segmentation fault (core dumped) > > Any hints ? > The parameters are not being passed to your VM in the way you expect. Here is what the man page for bash says: If the program is a file beginning with #!, the remainder of the first line specifies an interpreter for the program. The shell executes the specified interpreter on operating systems that do not handle this exe- cutable format themselves. The arguments to the interpreter consist of a single optional argument following the interpreter name on the first line of the program, followed by the name of the program, followed by the command arguments, if any. I think there is some trick you can use to pass parameters, but I can't recall the details. Maybe google can help. Dave

Oct. 16, 2012

Re: [Pharo-project] image format with shebang

by Sven Van Caekenberghe

On 16 Oct 2012, at 16:13, David T. Lewis <lewis(a)mail.msen.com> wrote: > If you don't want to do it in the VM, you can do it with a shell script. > Just make a 512 byte file that starts with the shebang line that you > want to use, prepend it to the saved image file (with /bin/cat) and set > file mode executable (chmod). Well, I tried on my Ubuntu server, and I could't get it to work. I have a Pharo 2.0 image and a little test script called run.st $ cat run.st NonInteractiveTranscript stdout install. ! | webSocket | webSocket := ZnWebSocket to: 'ws://localhost:8080/ws-echo'. [ webSocket sendMessage: 'Pharo Smalltalk using Zinc WebSockets'. Transcript show: webSocket readMessage; cr ] ensure: [ webSocket close ]. ! Smalltalk quitPrimitive. I wrote another small Smalltalk script to generate the header (just to be sure) $ cat write-header.st 'header.bin' asFileReference writeStreamDo: [ :stream | | line | line := '#!!/home/ubuntu/smalltalk/bin/CogVM -vm-display-null -vm-sound-null -plugins /home/ubuntu/smalltalk/bin/'. stream binary; nextPutAll: line asByteArray; nextPut: 10; nextPutAll: (ByteArray new: 511 - line size) ]. ! Smalltalk quitPrimitive. Now I have a 512 byte header that looks like this $ hexdump -C header.bin 00000000 23 21 2f 68 6f 6d 65 2f 75 62 75 6e 74 75 2f 73 |#!/home/ubuntu/s| 00000010 6d 61 6c 6c 74 61 6c 6b 2f 62 69 6e 2f 43 6f 67 |malltalk/bin/Cog| 00000020 56 4d 20 2d 76 6d 2d 64 69 73 70 6c 61 79 2d 6e |VM -vm-display-n| 00000030 75 6c 6c 20 2d 76 6d 2d 73 6f 75 6e 64 2d 6e 75 |ull -vm-sound-nu| 00000040 6c 6c 20 2d 70 6c 75 67 69 6e 73 20 2f 68 6f 6d |ll -plugins /hom| 00000050 65 2f 75 62 75 6e 74 75 2f 73 6d 61 6c 6c 74 61 |e/ubuntu/smallta| 00000060 6c 6b 2f 62 69 6e 2f 0a 00 00 00 00 00 00 00 00 |lk/bin/.........| 00000070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00000200 Then I concatenate the header and the working image cat header.bin zinc.image > magic.image and I copy the changes and make the image executable. The image still works $ /home/ubuntu/smalltalk/bin/CogVM -vm-display-null -vm-sound-null -plugins /home/ubuntu/smalltalk/bin/ magic.image run.st Pharo Smalltalk using Zinc WebSockets But not when run directly $ ./magic.image Segmentation fault (core dumped) Any hints ? Thx, Sven -- Sven Van Caekenberghe http://stfx.eu Smalltalk is the Red Pill

Oct. 16, 2012

Re: [Pharo-project] image format with shebang

by David T. Lewis

On Tue, Oct 16, 2012 at 03:08:45PM +0200, Sven Van Caekenberghe wrote: > I understand that it would be nice eventually to have images saved like that automatically. > > It is still a pity that the VM has to change for that ;-) If you don't want to do it in the VM, you can do it with a shell script. Just make a 512 byte file that starts with the shebang line that you want to use, prepend it to the saved image file (with /bin/cat) and set file mode executable (chmod). You could also do this from a method in the image if you prefer, although chmod would require FFI or OSProcess. Dave > > But as far as I understood, the first 512 bytes are skipped today as well, > so if you (or any program) does a binary edit of the image header, it would work, no ? > > On 16 Oct 2012, at 14:58, Camillo Bruni <camillobruni(a)gmail.com> wrote: > > > > > On 2012-10-16, at 14:49, Damien Cassou <damien.cassou(a)gmail.com> wrote: > > > >> On Sat, Oct 13, 2012 at 10:51 PM, Camillo Bruni <camillobruni(a)gmail.com> wrote: > >>>> It is supported, see for instance: http://marc.info/?l=squeak-vm-dev&m=124049248310307&w=2 > >>> awesome! strange that nobody promoted that so far... > >>> well I guess yet another of these hidden treasures ;) > >> > >> so, how can we have all images start with that line? > > > > > > we have to change the VM, yay! :/, to add a language side-hook: > > > > https://code.google.com/p/cog/issues/detail?id=101 > > > > so once I have a bit of time, I'll change the VM to always include this header. > > Load support for such images exist since the early days apparently. > > > > I will simply add a #header argument to the #snapshot method, that way the > > image can pass an arbitrary header to the VM on image save. > > > > best > > cami >

Oct. 16, 2012

Re: [Pharo-project] A trend and an unfair comparison about js everywhere

by StÃ©phane Ducasse

On Oct 16, 2012, at 12:10 PM, dimitris chloupis wrote: > My only concern is if we try to make smalltalk fit the style of the web, wont that mean that we compromise the quality of smalltalk libraries ? We are not :) Now as usual there is a man power problem. If you pays us 50 engineers during 2 years you will have a lot more than what we have in pharo :) > If we try to make desktop comply with web standards wont that lower the bar ? Would not be much better if we just port well proven desktop technologies to the web as it is already hapenning ( see WebGL) ?

Oct. 16, 2012

Re: [Pharo-project] image format with shebang

by Camillo Bruni

On 2012-10-16, at 15:30, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > On 16 Oct 2012, at 15:17, Camillo Bruni <camillobruni(a)gmail.com> wrote: >> On 2012-10-16, at 15:08, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: >>> I understand that it would be nice eventually to have images saved like that automatically. >>> >>> It is still a pity that the VM has to change for that ;-) >>> >>> But as far as I understood, the first 512 bytes are skipped today as well, >>> so if you (or any program) does a binary edit of the image header, it would work, no ? >> >> exactly :) I tried it and it works out of the box... just that the header is lost on image-save so far... > > Then maybe you should share the secret ? > > It would not be more than a couple of linux commands, would it ;-) I vim'ed the start of the file to include #!/usr/bin/env cogVM -headless and manually padded it ti 512bytes, so no magic so far :P

Oct. 16, 2012

Re: [Pharo-project] image format with shebang

by Sven Van Caekenberghe

On 16 Oct 2012, at 15:17, Camillo Bruni <camillobruni(a)gmail.com> wrote: > On 2012-10-16, at 15:08, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > >> I understand that it would be nice eventually to have images saved like that automatically. >> >> It is still a pity that the VM has to change for that ;-) >> >> But as far as I understood, the first 512 bytes are skipped today as well, >> so if you (or any program) does a binary edit of the image header, it would work, no ? > > exactly :) I tried it and it works out of the box... just that the header is lost on image-save so far... Then maybe you should share the secret ? It would not be more than a couple of linux commands, would it ;-)

Oct. 16, 2012