1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
#!/usr/bin/env python3
#
# SPDX-License-Identifier: GPL-2.0-only
#
"""git-make-shallow: make the current git repository shallow
Remove the history of the specified revisions, then optionally filter the
available refs to those specified.
"""
import argparse
import collections
import errno
import itertools
import os
import subprocess
import sys
version = 1.0
def main():
if sys.version_info < (3, 4, 0):
sys.exit('Python 3.4 or greater is required')
git_dir = check_output(['git', 'rev-parse', '--git-dir']).rstrip()
shallow_file = os.path.join(git_dir, 'shallow')
if os.path.exists(shallow_file):
try:
check_output(['git', 'fetch', '--unshallow'])
except subprocess.CalledProcessError:
try:
os.unlink(shallow_file)
except OSError as exc:
if exc.errno != errno.ENOENT:
raise
args = process_args()
revs = check_output(['git', 'rev-list'] + args.revisions).splitlines()
make_shallow(shallow_file, args.revisions, args.refs)
ref_revs = check_output(['git', 'rev-list'] + args.refs).splitlines()
remaining_history = set(revs) & set(ref_revs)
for rev in remaining_history:
if check_output(['git', 'rev-parse', '{}^@'.format(rev)]):
sys.exit('Error: %s was not made shallow' % rev)
filter_refs(args.refs)
if args.shrink:
shrink_repo(git_dir)
subprocess.check_call(['git', 'fsck', '--unreachable'])
def process_args():
# TODO: add argument to automatically keep local-only refs, since they
# can't be easily restored with a git fetch.
parser = argparse.ArgumentParser(description='Remove the history of the specified revisions, then optionally filter the available refs to those specified.')
parser.add_argument('--ref', '-r', metavar='REF', action='append', dest='refs', help='remove all but the specified refs (cumulative)')
parser.add_argument('--shrink', '-s', action='store_true', help='shrink the git repository by repacking and pruning')
parser.add_argument('revisions', metavar='REVISION', nargs='+', help='a git revision/commit')
if len(sys.argv) < 2:
parser.print_help()
sys.exit(2)
args = parser.parse_args()
if args.refs:
args.refs = check_output(['git', 'rev-parse', '--symbolic-full-name'] + args.refs).splitlines()
else:
args.refs = get_all_refs(lambda r, t, tt: t == 'commit' or tt == 'commit')
args.refs = list(filter(lambda r: not r.endswith('/HEAD'), args.refs))
args.revisions = check_output(['git', 'rev-parse'] + ['%s^{}' % i for i in args.revisions]).splitlines()
return args
def check_output(cmd, input=None):
return subprocess.check_output(cmd, universal_newlines=True, input=input)
def make_shallow(shallow_file, revisions, refs):
"""Remove the history of the specified revisions."""
for rev in follow_history_intersections(revisions, refs):
print("Processing %s" % rev)
with open(shallow_file, 'a') as f:
f.write(rev + '\n')
def get_all_refs(ref_filter=None):
"""Return all the existing refs in this repository, optionally filtering the refs."""
ref_output = check_output(['git', 'for-each-ref', '--format=%(refname)\t%(objecttype)\t%(*objecttype)'])
ref_split = [tuple(iter_extend(l.rsplit('\t'), 3)) for l in ref_output.splitlines()]
if ref_filter:
ref_split = (e for e in ref_split if ref_filter(*e))
refs = [r[0] for r in ref_split]
return refs
def iter_extend(iterable, length, obj=None):
"""Ensure that iterable is the specified length by extending with obj."""
return itertools.islice(itertools.chain(iterable, itertools.repeat(obj)), length)
def filter_refs(refs):
"""Remove all but the specified refs from the git repository."""
all_refs = get_all_refs()
to_remove = set(all_refs) - set(refs)
if to_remove:
check_output(['xargs', '-0', '-n', '1', 'git', 'update-ref', '-d', '--no-deref'],
input=''.join(l + '\0' for l in to_remove))
def follow_history_intersections(revisions, refs):
"""Determine all the points where the history of the specified revisions intersects the specified refs."""
queue = collections.deque(revisions)
seen = set()
for rev in iter_except(queue.popleft, IndexError):
if rev in seen:
continue
parents = check_output(['git', 'rev-parse', '%s^@' % rev]).splitlines()
yield rev
seen.add(rev)
if not parents:
continue
check_refs = check_output(['git', 'merge-base', '--independent'] + sorted(refs)).splitlines()
for parent in parents:
for ref in check_refs:
print("Checking %s vs %s" % (parent, ref))
try:
merge_base = check_output(['git', 'merge-base', parent, ref]).rstrip()
except subprocess.CalledProcessError:
continue
else:
queue.append(merge_base)
def iter_except(func, exception, start=None):
"""Yield a function repeatedly until it raises an exception."""
try:
if start is not None:
yield start()
while True:
yield func()
except exception:
pass
def shrink_repo(git_dir):
"""Shrink the newly shallow repository, removing the unreachable objects."""
subprocess.check_call(['git', 'reflog', 'expire', '--expire-unreachable=now', '--all'])
subprocess.check_call(['git', 'repack', '-ad'])
try:
os.unlink(os.path.join(git_dir, 'objects', 'info', 'alternates'))
except OSError as exc:
if exc.errno != errno.ENOENT:
raise
subprocess.check_call(['git', 'prune', '--expire', 'now'])
if __name__ == '__main__':
main()
|
