Esercizio 3 Prova Pratica 25-09-2014 - Revision history

Maldus at 09:02, 12 May 2015

2015-05-12T09:02:29Z

Maldus at 22:40, 11 May 2015

2015-05-11T22:40:38Z

Maldus at 22:39, 11 May 2015

2015-05-11T22:39:42Z

Blissett: Created page with " Scrivere un programma python o uno scrip bash che faccia un backup storico di un file. backn file n deve mantenere n versioni del file specificato. n>2 Es..."

2015-05-11T11:14:53Z

Created page with "<source lang="text"> Scrivere un programma python o uno scrip bash che faccia un backup storico di un file. backn file n deve mantenere n versioni del file specificato. n>2 Es..."

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<source lang="text">
Scrivere un programma python o uno scrip bash che faccia un backup storico di un file.
backn file n
deve mantenere n versioni del file specificato. n>2
Esempio:
backn miofile 10
se esiste miofile.9 deve essere rinominato in miofile.10
se esiste miofile 8 deve essere rinominato in miofile 9
e cosi' via fino a miofile.2, rinominato miofile 3.
ora se miofile.1 ha lo stesso contenuto di miofile.3, miofile diventa un link fisico a miofile.2
miofile viene copiato in miofile.1
</source>

== Soluzione di Blissett ==
<source lang="bash">
#! /bin/bash

if [[ $# != 2 || ! -f $1 ]]
then
echo "Usage: $0 file n_backup"
exit -48
fi

file=$1
n_backup=$2
cartella="cartellaBackup"
true=0

if [[ ! -d $cartella ]]
then
mkdir $cartella
fi
cd ./$cartella

for i in `find ./ -name "$file*" | sort -n -r -t. -k3 | cut -d. -f3`
do
true=1
tmp=`find ./ -name "$file.$i"`
num=$(($i+1))
mv $tmp "$file.$num"
if [[ $num -gt n_backup ]]
then
rm "$file.$num"
fi
done

if [[ $true -eq 1 ]]
then
cmp -s "$file.2" "../$file"
if [[ $? -eq 0 ]]
then
echo creo link fisico.
ln "$file.2" "$file.1"
else
cp ../$file ./
mv $file "$file.1"
fi
else
cp ../$file ./
mv $file "$file.1"
fi
</source>
--[[User:Blissett|Blissett]] ([[User talk:Blissett|talk]]) 13:14, 11 May 2015 (CEST)

@@ Line 99: / Line 99: @@
 for file in entries: olderVersion( new, file )
-entries = [ x for x in os.listdir('.') if os.path.isfile(x)]
+if new+'.2' in entries:
      if filecmp.cmp(new+'.3', new+'.1'): os.link(new, new+'.2')
      else: os.rename(new+'.1', new+'.2')

@@ Line 104: / Line 104: @@
      else: os.rename(new+'.1', new+'.2')
 elif new+'.1' in entries: os.rename(new+'.1', new+'.2')
 shutil.copyfile(new, new+'.1')
 </source>

← Older revision		Revision as of 22:39, 11 May 2015
Line 62:		Line 62:
	</source>		</source>
	--[[User:Blissett\|Blissett]] ([[User talk:Blissett\|talk]]) 13:14, 11 May 2015 (CEST)		--[[User:Blissett\|Blissett]] ([[User talk:Blissett\|talk]]) 13:14, 11 May 2015 (CEST)
		+
		+	==Soluzione di Maldus==
		+	<source lang="python">
		+	import argparse
		+	import sys
		+	import os
		+	import shutil
		+	import filecmp
		+
		+	def olderVersion( new, old ):
		+	new = new + '.'
		+	l = len(new)
		+	if new in old:
		+	try:
		+	num=int(old[l:])
		+	if num < args.version and num!=1 : os.rename(old, old[:l]+str(num+1))
		+	except ValueError:
		+	return
		+
		+
		+	parser = argparse.ArgumentParser(description='backup storico')
		+	parser.add_argument('file', metavar='file', type=str, help='file di cui fare backup')
		+	parser.add_argument('version', metavar='versione', type=int, help='numero di versione')
		+	args = parser.parse_args()
		+	new = args.file
		+
		+	if args.version < 2:
		+	print("la versione deve essere > 2")
		+	sys.exit(1)
		+
		+	entries = [ x for x in os.listdir('.') if os.path.isfile(x)]
		+	if not new in entries:
		+	print("Nessun file con quel nome")
		+	sys.exit(1)
		+
		+	for file in entries: olderVersion( new, file )
		+
		+	entries = [ x for x in os.listdir('.') if os.path.isfile(x)]
		+	if new+'.3' in entries:
		+	if filecmp.cmp(new+'.3', new+'.1'): os.link(new, new+'.2')
		+	else: os.rename(new+'.1', new+'.2')
		+	elif new+'.1' in entries: os.rename(new+'.1', new+'.2')
		+	shutil.copyfile(new, new+'.1')
		+	</source>