mirror of
https://github.com/frej/fast-export.git
synced 2025-11-01 08:55:47 +01:00
af3810ae2f
In the git repo there may be any number branches that are not hg imported branches, so it doesn't make sense to print warnings when a non-hg head isn't at what it was last time. Now we get a list of branchtags hg has and only verify these. Signed-off-by: Rocco Rutte <pdmef@gmx.net>
347 lines
10 KiB
Python
347 lines
10 KiB
Python
#!/usr/bin/env python
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# Copyright (c) 2007 Rocco Rutte <pdmef@gmx.net>
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# License: GPLv2
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"""hg2git.py - A mercurial-to-git filter for git-fast-import(1)
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Usage: hg2git.py <hg repo url> <marks file> <heads file> <tip file>
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"""
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from mercurial import repo,hg,cmdutil,util,ui,revlog,node
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from tempfile import mkstemp
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import re
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import sys
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import os
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# silly regex to catch Signed-off-by lines in log message
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sob_re=re.compile('^Signed-[Oo]ff-[Bb]y: (.+)$')
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# silly regex to see if user field has email address
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user_re=re.compile('([^<]+) (<[^>]+>)$')
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# silly regex to clean out user names
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user_clean_re=re.compile('^["]([^"]+)["]$')
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# git branch for hg's default 'HEAD' branch
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cfg_master='master'
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# insert 'checkpoint' command after this many commits or none at all if 0
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cfg_checkpoint_count=0
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def usage(ret):
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sys.stderr.write(__doc__)
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return ret
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def setup_repo(url):
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myui=ui.ui()
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return myui,hg.repository(myui,url)
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def fixup_user(user,authors):
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if authors!=None:
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# if we have an authors table, try to get mapping
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# by defaulting to the current value of 'user'
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user=authors.get(user,user)
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name,mail,m='','',user_re.match(user)
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if m==None:
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# if we don't have 'Name <mail>' syntax, use 'user
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# <devnull@localhost>' if use contains no at and
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# 'user <user>' otherwise
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name=user
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if '@' not in user:
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mail='<devnull@localhost>'
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else:
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mail='<%s>' % user
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else:
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# if we have 'Name <mail>' syntax, everything is fine :)
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name,mail=m.group(1),m.group(2)
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# remove any silly quoting from username
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m2=user_clean_re.match(name)
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if m2!=None:
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name=m2.group(1)
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return '%s %s' % (name,mail)
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def get_branch(name):
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if name=='HEAD':
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name=cfg_master
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return name
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def get_changeset(ui,repo,revision,authors):
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node=repo.lookup(revision)
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(manifest,user,(time,timezone),files,desc,extra)=repo.changelog.read(node)
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tz="%+03d%02d" % (-timezone / 3600, ((-timezone % 3600) / 60))
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branch=get_branch(extra.get('branch','master'))
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return (manifest,fixup_user(user,authors),(time,tz),files,desc,branch,extra)
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def gitmode(x):
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return x and '100755' or '100644'
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def wr(msg=''):
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print msg
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#map(lambda x: sys.stderr.write('\t[%s]\n' % x),msg.split('\n'))
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def checkpoint(count):
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count=count+1
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if cfg_checkpoint_count>0 and count%cfg_checkpoint_count==0:
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sys.stderr.write("Checkpoint after %d commits\n" % count)
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wr('checkpoint')
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wr()
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return count
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def get_parent_mark(parent,marks):
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"""Get the mark for some parent.
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If we saw it in the current session, return :%d syntax and
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otherwise the SHA1 from the cache."""
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return marks.get(str(parent+1),':%d' % (parent+1))
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def mismatch(f1,f2):
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"""See if two revisions of a file are not equal."""
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return node.hex(f1)!=node.hex(f2)
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def outer_set(dleft,dright,l,c,r):
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"""Loop over our repository and find all changed and missing files."""
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for left in dleft.keys():
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right=dright.get(left,None)
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if right==None:
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# we have the file but our parent hasn't: add to left set
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l.append(left)
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elif mismatch(dleft[left],right):
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# we have it but checksums mismatch: add to center set
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c.append(left)
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for right in dright.keys():
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left=dleft.get(right,None)
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if left==None:
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# if parent has file but we don't: add to right set
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r.append(right)
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# change is already handled when comparing child against parent
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return l,c,r
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def get_filechanges(repo,revision,parents,mleft):
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"""Given some repository and revision, find all changed/deleted files."""
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l,c,r=[],[],[]
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for p in parents:
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if p<0: continue
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mright=repo.changectx(p).manifest()
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dleft=mleft.keys()
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dleft.sort()
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dright=mright.keys()
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dright.sort()
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l,c,r=outer_set(mleft,mright,l,c,r)
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return l,c,r
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def get_author(logmessage,committer,authors):
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"""As git distincts between author and committer of a patch, try to
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extract author by detecting Signed-off-by lines.
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This walks from the end of the log message towards the top skipping
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empty lines. Upon the first non-empty line, it walks all Signed-off-by
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lines upwards to find the first one. For that (if found), it extracts
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authorship information the usual way (authors table, cleaning, etc.)
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If no Signed-off-by line is found, this defaults to the committer.
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This may sound stupid (and it somehow is), but in log messages we
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accidentially may have lines in the middle starting with
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"Signed-off-by: foo" and thus matching our detection regex. Prevent
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that."""
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loglines=logmessage.split('\n')
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i=len(loglines)
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# from tail walk to top skipping empty lines
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while i>=0:
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i-=1
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if len(loglines[i].strip())==0: continue
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break
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if i>=0:
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# walk further upwards to find first sob line, store in 'first'
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first=None
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while i>=0:
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m=sob_re.match(loglines[i])
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if m==None: break
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first=m
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i-=1
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# if the last non-empty line matches our Signed-Off-by regex: extract username
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if first!=None:
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r=fixup_user(first.group(1),authors)
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return r
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return committer
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def export_commit(ui,repo,revision,marks,heads,last,max,count,authors):
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(_,user,(time,timezone),files,desc,branch,_)=get_changeset(ui,repo,revision,authors)
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parents=repo.changelog.parentrevs(revision)
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wr('commit refs/heads/%s' % branch)
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wr('mark :%d' % (revision+1))
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wr('author %s %d %s' % (get_author(desc,user,authors),time,timezone))
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wr('committer %s %d %s' % (user,time,timezone))
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wr('data %d' % (len(desc)+1)) # wtf?
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wr(desc)
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wr()
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src=heads.get(branch,'')
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link=''
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if src!='':
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# if we have a cached head, this is an incremental import: initialize it
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# and kill reference so we won't init it again
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wr('from %s' % src)
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heads[branch]=''
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sys.stderr.write('Initializing branch [%s] to parent [%s]\n' %
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(branch,src))
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link=src # avoid making a merge commit for incremental import
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elif link=='' and not heads.has_key(branch) and revision>0:
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# newly created branch and not the first one: connect to parent
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tmp=get_parent_mark(parents[0],marks)
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wr('from %s' % tmp)
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sys.stderr.write('Link new branch [%s] to parent [%s]\n' %
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(branch,tmp))
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link=tmp # avoid making a merge commit for branch fork
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if parents:
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l=last.get(branch,revision)
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for p in parents:
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# 1) as this commit implicitely is the child of the most recent
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# commit of this branch, ignore this parent
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# 2) ignore nonexistent parents
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# 3) merge otherwise
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if p==l or p==revision or p<0:
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continue
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tmp=get_parent_mark(p,marks)
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# if we fork off a branch, don't merge with our parent via 'merge'
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# as we have 'from' already above
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if tmp==link:
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continue
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sys.stderr.write('Merging branch [%s] with parent [%s] from [r%d]\n' %
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(branch,tmp,p))
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wr('merge %s' % tmp)
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last[branch]=revision
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heads[branch]=''
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# we need this later to write out tags
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marks[str(revision)]=':%d'%(revision+1)
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ctx=repo.changectx(str(revision))
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man=ctx.manifest()
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added,changed,removed=get_filechanges(repo,revision,parents,man)
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sys.stderr.write('Exporting revision %d with %d/%d/%d added/changed/removed files\n' %
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(revision,len(added),len(changed),len(removed)))
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for a in added+changed:
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fctx=ctx.filectx(a)
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d=fctx.data()
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wr('M %s inline %s' % (gitmode(man.execf(a)),a))
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wr('data %d' % len(d)) # had some trouble with size()
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wr(d)
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for r in removed:
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wr('D %s' % r)
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wr()
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return checkpoint(count)
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def export_tags(ui,repo,marks_cache,start,end,count,authors):
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l=repo.tagslist()
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for tag,node in l:
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# ignore latest revision
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if tag=='tip': continue
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rev=repo.changelog.rev(node)
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# ignore those tags not in our import range
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if rev<start or rev>=end: continue
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ref=marks_cache.get(str(rev),None)
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if ref==None:
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sys.stderr.write('Failed to find reference for creating tag'
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' %s at r%d\n' % (tag,rev))
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continue
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(_,user,(time,timezone),_,desc,branch,_)=get_changeset(ui,repo,rev,authors)
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sys.stderr.write('Exporting tag [%s] at [hg r%d] [git %s]\n' % (tag,rev,ref))
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wr('tag %s' % tag)
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wr('from %s' % ref)
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wr('tagger %s %d %s' % (user,time,timezone))
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msg='hg2git created tag %s for hg revision %d on branch %s on (summary):\n\t%s' % (tag,
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rev,branch,desc.split('\n')[0])
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wr('data %d' % (len(msg)+1))
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wr(msg)
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wr()
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count=checkpoint(count)
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return count
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def load_cache(filename):
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cache={}
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if not os.path.exists(filename):
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return cache
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f=open(filename,'r')
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l=0
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for line in f.readlines():
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l+=1
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fields=line.split(' ')
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if fields==None or not len(fields)==2 or fields[0][0]!=':':
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sys.stderr.write('Invalid file format in [%s], line %d\n' % (filename,l))
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continue
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# put key:value in cache, key without ^:
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cache[fields[0][1:]]=fields[1].split('\n')[0]
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f.close()
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return cache
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def save_cache(filename,cache):
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f=open(filename,'w+')
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map(lambda x: f.write(':%s %s\n' % (str(x),str(cache.get(x)))),cache.keys())
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f.close()
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def verify_heads(ui,repo,cache):
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def getsha1(branch):
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f=open(os.getenv('GIT_DIR','/dev/null')+'/refs/heads/'+branch)
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sha1=f.readlines()[0].split('\n')[0]
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f.close()
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return sha1
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# get list of hg's branches to verify, don't take all git has
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branches=repo.branchtags()
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l=[(-repo.changelog.rev(n), n, t) for t, n in branches.items()]
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l.sort()
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for _,_,b in l:
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b=get_branch(b)
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sys.stderr.write('Verifying branch [%s]\n' % b)
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sha1=getsha1(b)
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c=cache.get(b)
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if sha1!=c:
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sys.stderr.write('Warning: Branch [%s] modified outside hg2git:'
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'\n%s (repo) != %s (cache)\n' % (b,sha1,c))
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return True
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def hg2git(repourl,m,marksfile,headsfile,tipfile,authors={}):
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_max=int(m)
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marks_cache=load_cache(marksfile)
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heads_cache=load_cache(headsfile)
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state_cache=load_cache(tipfile)
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ui,repo=setup_repo(repourl)
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if not verify_heads(ui,repo,heads_cache):
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return 1
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tip=repo.changelog.count()
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min=int(state_cache.get('tip',0))
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max=_max
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if _max<0:
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max=tip
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c=0
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last={}
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for rev in range(min,max):
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c=export_commit(ui,repo,rev,marks_cache,heads_cache,last,tip,c,authors)
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c=export_tags(ui,repo,marks_cache,min,max,c,authors)
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sys.stderr.write('Issued %d commands\n' % c)
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state_cache['tip']=max
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state_cache['repo']=repourl
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save_cache(tipfile,state_cache)
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return 0
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if __name__=='__main__':
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if len(sys.argv)!=6: sys.exit(usage(1))
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repourl,m,marksfile,headsfile,tipfile=sys.argv[1:]
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sys.exit(hg2git(repourl,m,marksfile,headsfile,tipfile))
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