Tutti i miei sbagli, versione 7 Marzo 2012 al XPUG mi
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Gli errori e le lezioni che ho imparato dallo sviluppo di un progetto Open Source
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Tutti i miei sbagli, versione 7 Marzo 2012 al XPUG mi
- 1. Tutti i miei sbagli Gli errori di un Wannabe Open Source Developer Andrea Francia Thursday, March 8, 12
- 2. Il progetto Gli Sbagli • Generic Naming Issue • Using Bash for functional testing Contenuti • • Feedback License • Project hosting Una cosa giusta Conclusioni Applausi Thursday, March 8, 12
- 3. trash-cli $ trash foo $ list-trash 2012-03-02 19:43:44 /Users/andrea/foo $ touch foo; trash foo $ list-trash 2012-03-02 19:43:44 /Users/andrea/foo 2012-03-02 19:44:04 /Users/andrea/foo $ restore-trash 0 2012-03-02 19:43:44 /Users/andrea/foo 1 2012-03-02 19:44:04 /Users/andrea/foo What file to restore [0..1]:0 Thursday, March 8, 12
- 4. Generic Naming Issue Thursday, March 8, 12
- 5. Comandi del pacchetto trash Butta un file empty-trash Svuota tutto il cestino list-trash Elenca il contenuto restore-trash Recupera un file Thursday, March 8, 12
- 8. Debian trash OK list-trash restore-trash empty-trash QA rejected Fedora Thursday, March 8, 12
- 9. Command name changes trash trash-put list-trash trash-list restore-trash trash-restore empty-trash trash-empty Thursday, March 8, 12
- 10. Risultato Debian --> vecchi nomi Upstream --> nomi nuovi Fedora --> Niente!!! (perdita di interesse dal package maintainer) Thursday, March 8, 12
- 11. Lessons Learned Non cambiare mai il nome dei comandi Non cedere alle pressioni dei revisori (tanto cambiano) More at: https://github.com/andreafrancia/trash-cli/blob/ master/docs/about-the-generic-naming-issue.txt Thursday, March 8, 12
- 12. Using Bash for functional testing Thursday, March 8, 12
- 13. shunit Thursday, March 8, 12
- 14. Results Very slow tests Unreadable failure messages Complex fixture set up Two test suites (bash+python) Thursday, March 8, 12
- 15. Lessons Learned Test di Integrazione? Ok, ser vono ma meglio che siano pochi. Test Funzionali? Meglio che siano omogenei con i test di unità Per la bash non sono necessarie librerie/ framework di test Thursday, March 8, 12
- 16. Bash for Testing(1) #!/bin/bash set -‐o errexit set -‐o nounset Thursday, March 8, 12
- 17. Bash for Testing(2) touch foo trash-‐put foo # foo should have been deleted test ! -‐f foo Thursday, March 8, 12
- 18. Bash for Testing(3) diff <(trash-‐list) -‐ << EXPECTED_RESULT 2012-‐03-‐02 19:43:44 /Users/andrea/foo 2012-‐03-‐02 19:44:04 /Users/andrea/foo EXPECTED_RESULT Thursday, March 8, 12
- 19. License Thursday, March 8, 12
- 20. GPL v2+ Thursday, March 8, 12
- 21. Lessons Learned Thursday, March 8, 12
- 22. Lessons Learned (1) Licenze già fatte sono comode ma vanno capite Thursday, March 8, 12
- 23. Lessons Learned (2) Il papiro all’inizio del file é una rottura Thursday, March 8, 12
- 24. Papiro della GPL #!/usr/bin/python # list-trash: list trashed files # # Copyright (C) 2007,2008 Andrea Francia Trivolzio(PV) Italy # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; either version 2 # of the License, or (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301, USA. from libtrash import TrashDirectory for trashed_file in TrashDirectory.trashed_files() : print "%s %s" % (trashed_file.deletion_date, trashed_file.path) Thursday, March 8, 12
- 25. Lessons learned (3) A volte conviene usare licenze più semplici Thursday, March 8, 12
- 26. DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE Version 2, December 2004 Copyright (C) 2004 Sam Hocevar <sam@hocevar.net> Everyone is permitted to copy and distribute verbatim or modified copies of this license document, and changing it is allowed as long as the name is changed. DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. You just DO WHAT THE FUCK YOU WANT TO. http://sam.zoy.org/wtfpl/ Thursday, March 8, 12
- 27. Code Hosting Services Thursday, March 8, 12
- 28. sourceforge.net ✉ Thursday, March 8, 12
- 29. Lessons Learned Automatable release support Feedback barrier Si può sempre cambiare bitbucket sf.net google code ? GitHub Thursday, March 8, 12
- 30. Internals: TrashDir Thursday, March 8, 12
- 31. Gnome KDE TrashDir cli XFCE Thursday, March 8, 12
- 32. How it works $ trash-‐put pippo.txt ~/.local/share/Trash/ +-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+ info/ ,-‐-‐-‐-‐-‐| [Trash Info] | pippo.txt.trashinfo | Path=/tmp/pippo.txt | files/ | DeletionDate=2012-‐02-‐29T00:13:54| pippo.txt +-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+ `. `-‐ original file moved here Thursday, March 8, 12
- 33. How it works $ touch pippo.txt; trash-‐put pippo.txt # again $ touch pippo.txt; trash-‐put pippo.txt # again $ touch pippo.txt; trash-‐put pippo.txt # again ~/.local/share/Trash/ info/ pippo.txt.trashinfo pippo_1.txt.trashinfo pippo_2.txt.trashinfo pippo_3.txt.trashinfo files/ pippo.txt pippo_1.txt pippo_2.txt pippo_3.txt Thursday, March 8, 12
- 34. Gnome KDE TrashDir cli XFCE Thursday, March 8, 12
- 35. Thursday, March 8, 12
- 36. pippo.txt pippo.txt Thursday, March 8, 12
- 37. open(3) #include <sys/stat.h> #include <fcntl.h> int open(const char *path, int oflag, ... ); ^ O_EXCL | O_CREAT -‐’ Thursday, March 8, 12
- 38. os.open import os fd = os.open(dest, os.O_RDWR | os.O_CREAT | os.O_EXCL, 0600) os.write(fd, content) os.close(fd) logger.trashinfo_created_as(dest) return (dest, trash_id) Thursday, March 8, 12
- 40. Lezioni miste (1) Utenti: va bene ascoltarli ma la vision la devi avere tu (WONTFIX, parallelo) Promozione per distro: Non vale la pena se poi non lo aggiornano Thursday, March 8, 12
- 41. Lezioni miste (2) Code Review? Utilissime, basta chiedere in lista. Occhio alle librerie e ai framework (OptionParser, Unipath) Thursday, March 8, 12
- 42. Lezioni miste (3) Tempo a disposizione? Peggio che al lavoro! Alta coesione e basso accoppiamento e test veloci sono indispensabili Thursday, March 8, 12
- 43. Lezioni miste (4) È vero che Git sembra più complicato di Subversion? Però è più facile integrare le patch degli altri meno conflitti inesistenti commit locali non si incasina se sposti una directory capisce da solo se hai rinominato un file Thursday, March 8, 12
- 44. Lezioni miste (5) Collaboration tools (wiki, blog, mailing- list) ➡Cominciano ad essere usati solo dopo quando c’e’ veramente tanto interesse ➡Si può aspettare a farli. Thursday, March 8, 12
- 45. Branches Thursday, March 8, 12
- 46. Lezione più grande Thursday, March 8, 12
- 47. Come lo farei ora? Beer/Pizza License Git GitHub Outside In TDD No Wiki, solo .txt tra i sorgenti Nessun push promozionale Thursday, March 8, 12
- 48. Grazie Andrea Francia http://andreafrancia.it andrea@andreafrancia.it Libero da settembre 2012 Thursday, March 8, 12
- 49. Altre cose Thursday, March 8, 12
- 50. Altro Singleton Logger Troppa docs sulla wiki Thursday, March 8, 12