1 #!/usr/bin/perl -w
2 #
3 # Copyright 2008-2009 Peter Krefting <peter@softwolves.pp.se>
4 #
5 # ------------------------------------------------------------------------
6 #
7 # This program is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation.
10 #
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
15 #
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 #
20 # ------------------------------------------------------------------------
22 =pod
24 =head1 NAME
26 import-directories - Import bits and pieces to Git.
28 =head1 SYNOPSIS
30 B<import-directories.perl> F<configfile> F<outputfile>
32 =head1 DESCRIPTION
34 Script to import arbitrary projects version controlled by the "copy the
35 source directory to a new location and edit it there"-version controlled
36 projects into version control. Handles projects with arbitrary branching
37 and version trees, taking a file describing the inputs and generating a
38 file compatible with the L<git-fast-import(1)> format.
40 =head1 CONFIGURATION FILE
42 =head2 Format
44 The configuration file is based on the standard I<.ini> format.
46 ; Comments start with semi-colons
47 [section]
48 key=value
50 Please see below for information on how to escape special characters.
52 =head2 Global configuration
54 Global configuration is done in the B<[config]> section, which should be
55 the first section in the file. Configuration can be changed by
56 repeating configuration sections later on.
58 [config]
59 ; configure conversion of CRLFs. "convert" means that all CRLFs
60 ; should be converted into LFs (suitable for the core.autocrlf
61 ; setting set to true in Git). "none" means that all data is
62 ; treated as binary.
63 crlf=convert
65 =head2 Revision configuration
67 Each revision that is to be imported is described in three
68 sections. Revisions should be defined in topological order, so
69 that a revision's parent has always been defined when a new revision
70 is introduced. All the sections for one revision must be defined
71 before defining the next revision.
73 Each revision is assigned a unique numerical identifier. The
74 numbers do not need to be consecutive, nor monotonically
75 increasing.
77 For instance, if your configuration file contains only the two
78 revisions 4711 and 42, where 4711 is the initial commit, the
79 only requirement is that 4711 is completely defined before 42.
81 =pod
83 =head3 Revision description section
85 A section whose section name is just an integer gives meta-data
86 about the revision.
88 [3]
89 ; author sets the author of the revisions
90 author=Peter Krefting <peter@softwolves.pp.se>
91 ; branch sets the branch that the revision should be committed to
92 branch=master
93 ; parent describes the revision that is the parent of this commit
94 ; (optional)
95 parent=1
96 ; merges describes a revision that is merged into this commit
97 ; (optional; can be repeated)
98 merges=2
99 ; selects one file to take the timestamp from
100 ; (optional; if unspecified, the most recent file from the .files
101 ; section is used)
102 timestamp=3/source.c
104 =head3 Revision contents section
106 A section whose section name is an integer followed by B<.files>
107 describe all the files included in this revision. If a file that
108 was available previously is not included in this revision, it will
109 be removed.
111 If an on-disk revision is incomplete, you can point to files from
112 a previous revision. There are no restriction as to where the source
113 files are located, nor to the names of them.
115 [3.files]
116 ; the key is the path inside the repository, the value is the path
117 ; as seen from the importer script.
118 source.c=ver-3.00/source.c
119 source.h=ver-2.99/source.h
120 readme.txt=ver-3.00/introduction to the project.txt
122 File names are treated as byte strings (but please see below on
123 quoting rules), and should be stored in the configuration file in
124 the encoding that should be used in the generated repository.
126 =head3 Revision commit message section
128 A section whose section name is an integer followed by B<.message>
129 gives the commit message. This section is read verbatim, up until
130 the beginning of the next section. As such, a commit message may not
131 contain a line that begins with an opening square bracket ("[") and
132 ends with a closing square bracket ("]"), unless they are surrounded
133 by whitespace or other characters.
135 [3.message]
136 Implement foobar.
137 ; trailing blank lines are ignored.
139 =cut
141 # Globals
142 use strict;
143 use integer;
144 my $crlfmode = 0;
145 my @revs;
146 my (%revmap, %message, %files, %author, %branch, %parent, %merges, %time, %timesource);
147 my $sectiontype = 0;
148 my $rev = 0;
149 my $mark = 1;
151 # Check command line
152 if ($#ARGV < 1 || $ARGV[0] =~ /^--?h/)
153 {
154 exec('perldoc', $0);
155 exit 1;
156 }
158 # Open configuration
159 my $config = $ARGV[0];
160 open CFG, '<', $config or die "Cannot open configuration file \"$config\": ";
162 # Open output
163 my $output = $ARGV[1];
164 open OUT, '>', $output or die "Cannot create output file \"$output\": ";
165 binmode OUT;
167 LINE: while (my $line = <CFG>)
168 {
169 $line =~ s/\r?\n$//;
170 next LINE if $sectiontype != 4 && $line eq '';
171 next LINE if $line =~ /^;/;
172 my $oldsectiontype = $sectiontype;
173 my $oldrev = $rev;
175 # Sections
176 if ($line =~ m"^\[(config|(\d+)(|\.files|\.message))\]$")
177 {
178 if ($1 eq 'config')
179 {
180 $sectiontype = 1;
181 }
182 elsif ($3 eq '')
183 {
184 $sectiontype = 2;
185 $rev = $2;
186 # Create a new revision
187 die "Duplicate rev: $line\n " if defined $revmap{$rev};
188 print "Reading revision $rev\n";
189 push @revs, $rev;
190 $revmap{$rev} = $mark ++;
191 $time{$revmap{$rev}} = 0;
192 }
193 elsif ($3 eq '.files')
194 {
195 $sectiontype = 3;
196 $rev = $2;
197 die "Revision mismatch: $line\n " unless $rev == $oldrev;
198 }
199 elsif ($3 eq '.message')
200 {
201 $sectiontype = 4;
202 $rev = $2;
203 die "Revision mismatch: $line\n " unless $rev == $oldrev;
204 }
205 else
206 {
207 die "Internal parse error: $line\n ";
208 }
209 next LINE;
210 }
212 # Parse data
213 if ($sectiontype != 4)
214 {
215 # Key and value
216 if ($line =~ m"^\s*([^\s].*=.*[^\s])\s*$")
217 {
218 my ($key, $value) = &parsekeyvaluepair($1);
219 # Global configuration
220 if (1 == $sectiontype)
221 {
222 if ($key eq 'crlf')
223 {
224 $crlfmode = 1, next LINE if $value eq 'convert';
225 $crlfmode = 0, next LINE if $value eq 'none';
226 }
227 die "Unknown configuration option: $line\n ";
228 }
229 # Revision specification
230 if (2 == $sectiontype)
231 {
232 my $current = $revmap{$rev};
233 $author{$current} = $value, next LINE if $key eq 'author';
234 $branch{$current} = $value, next LINE if $key eq 'branch';
235 $parent{$current} = $value, next LINE if $key eq 'parent';
236 $timesource{$current} = $value, next LINE if $key eq 'timestamp';
237 push(@{$merges{$current}}, $value), next LINE if $key eq 'merges';
238 die "Unknown revision option: $line\n ";
239 }
240 # Filespecs
241 if (3 == $sectiontype)
242 {
243 # Add the file and create a marker
244 die "File not found: $line\n " unless -f $value;
245 my $current = $revmap{$rev};
246 ${$files{$current}}{$key} = $mark;
247 my $time = &fileblob($value, $crlfmode, $mark ++);
249 # Update revision timestamp if more recent than other
250 # files seen, or if this is the file we have selected
251 # to take the time stamp from using the "timestamp"
252 # directive.
253 if ((defined $timesource{$current} && $timesource{$current} eq $value)
254 || $time > $time{$current})
255 {
256 $time{$current} = $time;
257 }
258 }
259 }
260 else
261 {
262 die "Parse error: $line\n ";
263 }
264 }
265 else
266 {
267 # Commit message
268 my $current = $revmap{$rev};
269 if (defined $message{$current})
270 {
271 $message{$current} .= "\n";
272 }
273 $message{$current} .= $line;
274 }
275 }
276 close CFG;
278 # Start spewing out data for git-fast-import
279 foreach my $commit (@revs)
280 {
281 # Progress
282 print OUT "progress Creating revision $commit\n";
284 # Create commit header
285 my $mark = $revmap{$commit};
287 # Branch and commit id
288 print OUT "commit refs/heads/", $branch{$mark}, "\nmark :", $mark, "\n";
290 # Author and timestamp
291 die "No timestamp defined for $commit (no files?)\n" unless defined $time{$mark};
292 print OUT "committer ", $author{$mark}, " ", $time{$mark}, " +0100\n";
294 # Commit message
295 die "No message defined for $commit\n" unless defined $message{$mark};
296 my $message = $message{$mark};
297 $message =~ s/\n$//; # Kill trailing empty line
298 print OUT "data ", length($message), "\n", $message, "\n";
300 # Parent and any merges
301 print OUT "from :", $revmap{$parent{$mark}}, "\n" if defined $parent{$mark};
302 if (defined $merges{$mark})
303 {
304 foreach my $merge (@{$merges{$mark}})
305 {
306 print OUT "merge :", $revmap{$merge}, "\n";
307 }
308 }
310 # Output file marks
311 print OUT "deleteall\n"; # start from scratch
312 foreach my $file (sort keys %{$files{$mark}})
313 {
314 print OUT "M 644 :", ${$files{$mark}}{$file}, " $file\n";
315 }
316 print OUT "\n";
317 }
319 # Create one file blob
320 sub fileblob
321 {
322 my ($filename, $crlfmode, $mark) = @_;
324 # Import the file
325 print OUT "progress Importing $filename\nblob\nmark :$mark\n";
326 open FILE, '<', $filename or die "Cannot read $filename\n ";
327 binmode FILE;
328 my ($size, $mtime) = (stat(FILE))[7,9];
329 my $file;
330 read FILE, $file, $size;
331 close FILE;
332 $file =~ s/\r\n/\n/g if $crlfmode;
333 print OUT "data ", length($file), "\n", $file, "\n";
335 return $mtime;
336 }
338 # Parse a key=value pair
339 sub parsekeyvaluepair
340 {
341 =pod
343 =head2 Escaping special characters
345 Key and value strings may be enclosed in quotes, in which case
346 whitespace inside the quotes is preserved. Additionally, an equal
347 sign may be included in the key by preceeding it with a backslash.
348 For example:
350 "key1 "=value1
351 key2=" value2"
352 key\=3=value3
353 key4=value=4
354 "key5""=value5
356 Here the first key is "key1 " (note the trailing white-space) and the
357 second value is " value2" (note the leading white-space). The third
358 key contains an equal sign "key=3" and so does the fourth value, which
359 does not need to be escaped. The fifth key contains a trailing quote,
360 which does not need to be escaped since it is inside a surrounding
361 quote.
363 =cut
364 my $pair = shift;
366 # Separate key and value by the first non-quoted equal sign
367 my ($key, $value);
368 if ($pair =~ /^(.*[^\\])=(.*)$/)
369 {
370 ($key, $value) = ($1, $2)
371 }
372 else
373 {
374 die "Parse error: $pair\n ";
375 }
377 # Unquote and unescape the key and value separately
378 return (&unescape($key), &unescape($value));
379 }
381 # Unquote and unescape
382 sub unescape
383 {
384 my $string = shift;
386 # First remove enclosing quotes. Backslash before the trailing
387 # quote leaves both.
388 if ($string =~ /^"(.*[^\\])"$/)
389 {
390 $string = $1;
391 }
393 # Second remove any backslashes inside the unquoted string.
394 # For later: Handle special sequences like \t ?
395 $string =~ s/\\(.)/$1/g;
397 return $string;
398 }
400 __END__
402 =pod
404 =head1 EXAMPLES
406 B<import-directories.perl> F<project.import>
408 =head1 AUTHOR
410 Copyright 2008-2009 Peter Krefting E<lt>peter@softwolves.pp.se>
412 This program is free software; you can redistribute it and/or modify
413 it under the terms of the GNU General Public License as published by
414 the Free Software Foundation.
416 =cut