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#!/usr/bin/python
# __________ __ ___.
# Open \______ \ ____ ____ | | _\_ |__ _______ ___
# Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
# Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
# Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
# \/ \/ \/ \/ \/
#
# Copyright (c) 2012 Dominik Riebeling
#
# All files in this archive are subject to the GNU General Public License.
# See the file COPYING in the source tree root for full license agreement.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
'''Scrape files from a git repository.
This module provides functions to get a subset of files from a git repository.
The files to retrieve can be specified, and the git tree to work on can be
specified. That way arbitrary trees can be retrieved (like a subset of files
for a given tag).
Retrieved files can be packaged into a bzip2 compressed tarball or stored in a
given folder for processing afterwards.
Calls git commands directly for maximum compatibility.
'''
import re
import subprocess
import os
import tarfile
import tempfile
import shutil
def get_refs(repo):
'''Get dict matching refs to hashes from repository pointed to by repo.
@param repo Path to repository root.
@return Dict matching hashes to each ref.
'''
print("Getting list of refs")
output = subprocess.Popen(["git", "show-ref", "--abbrev"],
stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=repo)
cmdout = output.communicate()
refs = {}
if len(cmdout[1]) > 0:
print("An error occured!\n")
print(cmdout[1])
return refs
for line in cmdout:
regex = re.findall(b'([a-f0-9]+)\s+(\S+)', line)
for r in regex:
# ref is the key, hash its value.
refs[r[1].decode()] = r[0].decode()
return refs
def get_lstree(repo, start, filterlist=[]):
'''Get recursive list of tree objects for a given tree.
@param repo Path to repository root.
@param start Hash identifying the tree.
@param filterlist List of paths to retrieve objecs hashes for.
An empty list will retrieve all paths.
@return Dict mapping filename to blob hash
'''
output = subprocess.Popen(["git", "ls-tree", "-r", start],
stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=repo)
cmdout = output.communicate()
objects = {}
if len(cmdout[1]) > 0:
print("An error occured!\n")
print(cmdout[1])
return objects
for line in cmdout[0].decode().split('\n'):
regex = re.findall(b'([0-9]+)\s+([a-z]+)\s+([0-9a-f]+)\s+(.*)',
line.encode())
for rf in regex:
# filter
add = False
for f in filterlist:
if rf[3].decode().find(f) == 0:
add = True
# If two files have the same content they have the same hash, so
# the filename has to be used as key.
if len(filterlist) == 0 or add == True:
if rf[3] in objects:
print("FATAL: key already exists in dict!")
return {}
objects[rf[3].decode()] = rf[2].decode()
return objects
def get_file_timestamp(repo, tree, filename):
'''Get timestamp for a file.
@param repo Path to repository root.
@param tree Hash of tree to use.
@param filename Filename in tree
@return Timestamp as string.
'''
output = subprocess.Popen(
["git", "log", "--format=%ai", "-n", "1", tree, filename],
stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=repo)
cmdout = output.communicate()
return cmdout[0].decode().rstrip()
def get_object(repo, blob, destfile):
'''Get an identified object from the repository.
@param repo Path to repository root.
@param blob hash for blob to retrieve.
@param destfile filename for blob output.
@return True if file was successfully written, False on error.
'''
output = subprocess.Popen(["git", "cat-file", "-p", blob],
stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=repo)
cmdout = output.communicate()
# make sure output path exists
if len(cmdout[1]) > 0:
print("An error occured!\n")
print(cmdout[1])
return False
if not os.path.exists(os.path.dirname(destfile)):
os.makedirs(os.path.dirname(destfile))
f = open(destfile, 'wb')
f.write(cmdout[0])
f.close()
return True
def describe_treehash(repo, treehash):
'''Retrieve output of git-describe for a given hash.
@param repo Path to repository root.
@param treehash Hash identifying the tree / commit to describe.
@return Description string.
'''
output = subprocess.Popen(["git", "describe", treehash],
stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=repo)
cmdout = output.communicate()
if len(cmdout[1]) > 0:
print("An error occured!\n")
print(cmdout[1])
return ""
return cmdout[0].rstrip()
def scrape_files(repo, treehash, filelist, dest="", timestamp_files=[]):
'''Scrape list of files from repository.
@param repo Path to repository root.
@param treehash Hash identifying the tree.
@param filelist List of files to get from repository.
@param dest Destination path for files. Files will get retrieved with full
path from the repository, and the folder structure will get
created below dest as necessary.
@param timestamp_files List of files to also get the last modified date.
WARNING: this is SLOW!
@return Destination path, filename:timestamp dict.
'''
print("Scraping files from repository")
if dest == "":
dest = tempfile.mkdtemp()
treeobjects = get_lstree(repo, treehash, filelist)
timestamps = {}
for obj in treeobjects:
get_object(repo, treeobjects[obj], os.path.join(dest, obj))
for f in timestamp_files:
if obj.find(f) == 0:
timestamps[obj] = get_file_timestamp(repo, treehash, obj)
return [dest, timestamps]
def archive_files(repo, treehash, filelist, basename, tmpfolder="",
archive="tbz"):
'''Archive list of files into tarball.
@param repo Path to repository root.
@param treehash Hash identifying the tree.
@param filelist List of files to archive. All files in the archive if left
empty.
@param basename Basename (including path) of output file. Will get used as
basename inside of the archive as well (i.e. no tarbomb).
@param tmpfolder Folder to put intermediate files in. If no folder is given
a temporary one will get used.
@param archive Type of archive to create. Supported values are "tbz" and
"7z". The latter requires the 7z binary available in the
system's path.
@return Output filename.
'''
if tmpfolder == "":
temp_remove = True
tmpfolder = tempfile.mkdtemp()
else:
temp_remove = False
workfolder = scrape_files(repo, treehash, filelist,
os.path.join(tmpfolder, basename))[0]
if basename is "":
return ""
print("Archiving files from repository")
if archive == "7z":
outfile = basename + ".7z"
output = subprocess.Popen(["7z", "a",
os.path.join(os.getcwd(), basename + ".7z"), basename],
cwd=tmpfolder, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output.communicate()
elif archive == "tbz":
outfile = basename + ".tar.bz2"
tf = tarfile.open(outfile, "w:bz2")
tf.add(workfolder, basename)
tf.close()
else:
print("Files not archived")
if tmpfolder != workfolder:
shutil.rmtree(workfolder)
if temp_remove:
shutil.rmtree(tmpfolder)
return outfile
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