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41a6d859 CM |
1 | #!/usr/bin/env python |
2 | """Performs a 3-way merge for GIT files | |
3 | """ | |
4 | ||
5 | __copyright__ = """ | |
6 | Copyright (C) 2005, Catalin Marinas <catalin.marinas@gmail.com> | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License version 2 as | |
10 | published by the Free Software Foundation. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | """ | |
21 | ||
22 | import sys, os | |
23 | from stgit.config import config | |
24 | from stgit.utils import append_string | |
25 | ||
26 | ||
27 | # | |
28 | # Options | |
29 | # | |
30 | try: | |
31 | merger = config.get('gitmergeonefile', 'merger') | |
32 | except Exception, err: | |
33 | print >> sys.stderr, 'Configuration error: %s' % err | |
34 | sys.exit(1) | |
35 | ||
36 | if config.has_option('gitmergeonefile', 'keeporig'): | |
37 | keeporig = config.get('gitmergeonefile', 'keeporig') | |
38 | else: | |
39 | keeporig = 'yes' | |
40 | ||
41 | ||
42 | # | |
43 | # Global variables | |
44 | # | |
45 | if 'GIT_DIR' in os.environ: | |
46 | base_dir = os.environ['GIT_DIR'] | |
47 | else: | |
48 | base_dir = '.git' | |
49 | ||
50 | ||
51 | # | |
52 | # Utility functions | |
53 | # | |
54 | def __str2none(x): | |
55 | if x == '': | |
56 | return None | |
57 | else: | |
58 | return x | |
59 | ||
60 | def __output(cmd): | |
61 | f = os.popen(cmd, 'r') | |
62 | string = f.readline().strip() | |
63 | if f.close(): | |
64 | print >> sys.stderr, 'Error: failed to execute "%s"' % cmd | |
65 | sys.exit(1) | |
66 | return string | |
67 | ||
68 | def __checkout_files(): | |
69 | """Check out the files passed as arguments | |
70 | """ | |
71 | global orig, src1, src2 | |
72 | ||
73 | if orig_hash: | |
74 | orig = '%s.older' % path | |
75 | tmp = __output('git-unpack-file %s' % orig_hash) | |
76 | os.chmod(tmp, int(orig_mode, 8)) | |
77 | os.rename(tmp, orig) | |
78 | if file1_hash: | |
79 | src1 = '%s.local' % path | |
80 | tmp = __output('git-unpack-file %s' % file1_hash) | |
81 | os.chmod(tmp, int(file1_mode, 8)) | |
82 | os.rename(tmp, src1) | |
83 | if file2_hash: | |
84 | src2 = '%s.remote' % path | |
85 | tmp = __output('git-unpack-file %s' % file2_hash) | |
86 | os.chmod(tmp, int(file2_mode, 8)) | |
87 | os.rename(tmp, src2) | |
88 | ||
89 | def __remove_files(): | |
90 | """Remove any temporary files | |
91 | """ | |
92 | if orig_hash: | |
93 | os.remove(orig) | |
94 | if file1_hash: | |
95 | os.remove(src1) | |
96 | if file2_hash: | |
97 | os.remove(src2) | |
98 | pass | |
99 | ||
100 | def __conflict(): | |
101 | """Write the conflict file for the 'path' variable and exit | |
102 | """ | |
103 | append_string(os.path.join(base_dir, 'conflicts'), path) | |
104 | sys.exit(1) | |
105 | ||
106 | ||
107 | # $1 - original file SHA1 (or empty) | |
108 | # $2 - file in branch1 SHA1 (or empty) | |
109 | # $3 - file in branch2 SHA1 (or empty) | |
110 | # $4 - pathname in repository | |
111 | # $5 - orignal file mode (or empty) | |
112 | # $6 - file in branch1 mode (or empty) | |
113 | # $7 - file in branch2 mode (or empty) | |
114 | #print 'gitmerge.py "%s" "%s" "%s" "%s" "%s" "%s" "%s"' % tuple(sys.argv[1:8]) | |
115 | orig_hash, file1_hash, file2_hash, path, orig_mode, file1_mode, file2_mode = \ | |
116 | [__str2none(x) for x in sys.argv[1:8]] | |
117 | ||
118 | ||
119 | # | |
120 | # Main algorithm | |
121 | # | |
122 | __checkout_files() | |
123 | ||
124 | # file exists in origin | |
125 | if orig_hash: | |
126 | # modified in both | |
127 | if file1_hash and file2_hash: | |
128 | # if modes are the same (git-read-tree probably dealed with it) | |
129 | if file1_hash == file2_hash: | |
130 | if os.system('git-update-cache --cacheinfo %s %s %s' | |
131 | % (file1_mode, file1_hash, path)) != 0: | |
132 | print >> sys.stderr, 'Error: git-update-cache failed' | |
133 | __conflict() | |
134 | if os.system('git-checkout-cache -u -f -- %s' % path): | |
135 | print >> sys.stderr, 'Error: git-checkout-cache failed' | |
136 | __conflict() | |
137 | if file1_mode != file2_mode: | |
138 | print >> sys.stderr, \ | |
139 | 'Error: File added in both, permissions conflict' | |
140 | __conflict() | |
141 | # 3-way merge | |
142 | else: | |
143 | merge_ok = os.system(merger % {'branch1': src1, | |
144 | 'ancestor': orig, | |
145 | 'branch2': src2, | |
146 | 'output': path }) == 0 | |
147 | ||
148 | if merge_ok: | |
149 | os.system('git-update-cache %s' % path) | |
150 | __remove_files() | |
151 | sys.exit(0) | |
152 | else: | |
153 | print >> sys.stderr, \ | |
154 | 'Error: three-way merge tool failed for file "%s"' % path | |
155 | # reset the cache to the first branch | |
156 | os.system('git-update-cache --cacheinfo %s %s %s' | |
157 | % (file1_mode, file1_hash, path)) | |
158 | if keeporig != 'yes': | |
159 | __remove_files() | |
160 | __conflict() | |
161 | # file deleted in both or deleted in one and unchanged in the other | |
162 | elif not (file1_hash or file2_hash) \ | |
163 | or file1_hash == orig_hash or file2_hash == orig_hash: | |
164 | if os.path.exists(path): | |
165 | os.remove(path) | |
166 | __remove_files() | |
167 | sys.exit(os.system('git-update-cache --remove %s' % path)) | |
168 | # file does not exist in origin | |
169 | else: | |
170 | # file added in both | |
171 | if file1_hash and file2_hash: | |
172 | # files are the same | |
173 | if file1_hash == file2_hash: | |
174 | if os.system('git-update-cache --add --cacheinfo %s %s %s' | |
175 | % (file1_mode, file1_hash, path)) != 0: | |
176 | print >> sys.stderr, 'Error: git-update-cache failed' | |
177 | __conflict() | |
178 | if os.system('git-checkout-cache -u -f -- %s' % path): | |
179 | print >> sys.stderr, 'Error: git-checkout-cache failed' | |
180 | __conflict() | |
181 | if file1_mode != file2_mode: | |
182 | print >> sys.stderr, \ | |
183 | 'Error: File "s" added in both, permissions conflict' \ | |
184 | % path | |
185 | __conflict() | |
186 | # files are different | |
187 | else: | |
188 | print >> sys.stderr, \ | |
189 | 'Error: File "%s" added in branches but different' % path | |
190 | __conflict() | |
191 | # file added in one | |
192 | elif file1_hash or file2_hash: | |
193 | if file1_hash: | |
194 | mode = file1_mode | |
195 | obj = file1_hash | |
196 | else: | |
197 | mode = file2_mode | |
198 | obj = file2_hash | |
199 | if os.system('git-update-cache --add --cacheinfo %s %s %s' | |
200 | % (mode, obj, path)) != 0: | |
201 | print >> sys.stderr, 'Error: git-update-cache failed' | |
202 | __conflict() | |
203 | __remove_files() | |
204 | sys.exit(os.system('git-checkout-cache -u -f -- %s' % path)) | |
205 | ||
206 | # Un-handled case | |
207 | print >> sys.stderr, 'Error: Un-handled merge conflict' | |
208 | print >> sys.stderr, 'gitmerge.py "%s" "%s" "%s" "%s" "%s" "%s" "%s"' \ | |
209 | % tuple(sys.argv[1:8]) | |
210 | __conflict() |