author | Mads Kiilerich <mads@kiilerich.com> |
Thu, 08 Dec 2011 16:28:18 +0100 | |
changeset 15897 | cc021114fc98 |
parent 15892 | 592b3d1742a1 |
child 15902 | 4252d9f08d7e |
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""" Mercurial phases support code |
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--- |
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Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
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Logilab SA <contact@logilab.fr> |
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Augie Fackler <durin42@gmail.com> |
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This software may be used and distributed according to the terms of the |
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GNU General Public License version 2 or any later version. |
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--- |
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This module implements most phase logic in mercurial. |
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Basic Concept |
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============= |
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A 'changeset phases' is an indicator that tells us how a changeset is |
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manipulated and communicated. The details of each phase is described below, |
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here we describe the properties they have in common. |
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Like bookmarks, phases are not stored in history and thus are not permanent and |
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leave no audit trail. |
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First, no changeset can be in two phases at once. Phases are ordered, so they |
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can be considered from lowest to highest. The default, lowest phase is 'public' |
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- this is the normal phase of existing changesets. A child changeset can not be |
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in a lower phase than its parents. |
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These phases share a hierarchy of traits: |
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immutable shared |
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public: X X |
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draft: X |
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secret: |
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local commits are draft by default |
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Phase movement and exchange |
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============================ |
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Phase data are exchanged by pushkey on pull and push. Some server have a |
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publish option set, we call them publishing server. Pushing to such server make |
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draft changeset publish. |
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A small list of fact/rules define the exchange of phase: |
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* old client never changes server states |
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* pull never changes server states |
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* publish and old server csets are seen as public by client |
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* Any secret changeset seens in another repository is lowered to at least draft |
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Here is the final table summing up the 49 possible usecase of phase exchange: |
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server |
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old publish non-publish |
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N X N D P N D P |
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old client |
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pull |
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N - X/X - X/D X/P - X/D X/P |
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X - X/X - X/D X/P - X/D X/P |
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push |
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X X/X X/X X/P X/P X/P X/D X/D X/P |
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new client |
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pull |
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N - P/X - P/D P/P - D/D P/P |
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D - P/X - P/D P/P - D/D P/P |
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P - P/X - P/D P/P - P/D P/P |
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push |
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D P/X P/X P/P P/P P/P D/D D/D P/P |
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P P/X P/X P/P P/P P/P P/P P/P P/P |
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Legend: |
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A/B = final state on client / state on server |
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* N = new/not present, |
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* P = public, |
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* D = draft, |
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* X = not tracked (ie: the old client or server has no internal way of |
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recording the phase.) |
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passive = only pushes |
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A cell here can be read like this: |
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"When a new client pushes a draft changeset (D) to a publishing server |
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where it's not present (N), it's marked public on both sides (P/P)." |
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Note: old client behave as publish server with Draft only content |
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- other people see it as public |
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- content is pushed as draft |
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""" |
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100 |
|
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import errno |
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from node import nullid, bin, hex, short |
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from i18n import _ |
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104 |
|
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allphases = public, draft, secret = range(3) |
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trackedphases = allphases[1:] |
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phasenames = ['public', 'draft', 'secret'] |
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108 |
|
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109 |
def readroots(repo): |
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"""Read phase roots from disk""" |
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roots = [set() for i in allphases] |
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roots[0].add(nullid) |
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113 |
try: |
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f = repo.sopener('phaseroots') |
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115 |
try: |
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for line in f: |
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phase, nh = line.strip().split() |
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roots[int(phase)].add(bin(nh)) |
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119 |
finally: |
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f.close() |
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121 |
except IOError, inst: |
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122 |
if inst.errno != errno.ENOENT: |
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123 |
raise |
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124 |
return roots |
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125 |
|
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126 |
def writeroots(repo): |
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127 |
"""Write phase roots from disk""" |
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f = repo.sopener('phaseroots', 'w', atomictemp=True) |
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129 |
try: |
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130 |
for phase, roots in enumerate(repo._phaseroots): |
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for h in roots: |
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f.write('%i %s\n' % (phase, hex(h))) |
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133 |
repo._dirtyphases = False |
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134 |
finally: |
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135 |
f.close() |
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136 |
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137 |
def filterunknown(repo, phaseroots=None): |
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138 |
"""remove unknown nodes from the phase boundary |
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139 |
|
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140 |
no data is lost as unknown node only old data for their descentants |
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141 |
""" |
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142 |
if phaseroots is None: |
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143 |
phaseroots = repo._phaseroots |
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144 |
for phase, nodes in enumerate(phaseroots): |
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missing = [node for node in nodes if node not in repo] |
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146 |
if missing: |
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147 |
for mnode in missing: |
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msg = _('Removing unknown node %(n)s from %(p)i-phase boundary') |
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149 |
repo.ui.debug(msg, {'n': short(mnode), 'p': phase}) |
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150 |
nodes.symmetric_difference_update(missing) |
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151 |
repo._dirtyphases = True |
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152 |
|
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153 |
def advanceboundary(repo, targetphase, nodes): |
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154 |
"""Add nodes to a phase changing other nodes phases if necessary. |
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155 |
|
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156 |
This function move boundary *forward* this means that all nodes are set |
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157 |
in the target phase or kept in a *lower* phase. |
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158 |
|
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159 |
Simplify boundary to contains phase roots only.""" |
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160 |
delroots = [] # set of root deleted by this path |
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161 |
for phase in xrange(targetphase + 1, len(allphases)): |
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162 |
# filter nodes that are not in a compatible phase already |
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163 |
# XXX rev phase cache might have been invalidated by a previous loop |
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164 |
# XXX we need to be smarter here |
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165 |
nodes = [n for n in nodes if repo[n].phase() >= phase] |
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166 |
if not nodes: |
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167 |
break # no roots to move anymore |
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168 |
roots = repo._phaseroots[phase] |
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169 |
olds = roots.copy() |
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170 |
ctxs = list(repo.set('roots((%ln::) - (%ln::%ln))', olds, olds, nodes)) |
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171 |
roots.clear() |
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172 |
roots.update(ctx.node() for ctx in ctxs) |
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173 |
if olds != roots: |
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174 |
# invalidate cache (we probably could be smarter here |
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175 |
if '_phaserev' in vars(repo): |
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176 |
del repo._phaserev |
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177 |
repo._dirtyphases = True |
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178 |
# some roots may need to be declared for lower phases |
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179 |
delroots.extend(olds - roots) |
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180 |
# declare deleted root in the target phase |
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181 |
if targetphase != 0: |
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182 |
retractboundary(repo, targetphase, delroots) |
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183 |
|
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184 |
|
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185 |
def retractboundary(repo, targetphase, nodes): |
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186 |
"""Set nodes back to a phase changing other nodes phases if necessary. |
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187 |
|
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188 |
This function move boundary *backward* this means that all nodes are set |
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189 |
in the target phase or kept in a *higher* phase. |
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190 |
|
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191 |
Simplify boundary to contains phase roots only.""" |
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192 |
currentroots = repo._phaseroots[targetphase] |
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193 |
newroots = [n for n in nodes if repo[n].phase() < targetphase] |
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194 |
if newroots: |
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195 |
currentroots.update(newroots) |
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196 |
ctxs = repo.set('roots(%ln::)', currentroots) |
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197 |
currentroots.intersection_update(ctx.node() for ctx in ctxs) |
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198 |
if '_phaserev' in vars(repo): |
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199 |
del repo._phaserev |
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200 |
repo._dirtyphases = True |
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201 |
|
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|
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def listphases(repo): |
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"""List phases root for serialisation over pushkey""" |
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keys = {} |
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value = '%i' % draft |
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for root in repo._phaseroots[draft]: |
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keys[hex(root)] = value |
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if repo.ui.configbool('phases', 'publish', True): |
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# Add an extra data to let remote know we are a publishing repo. |
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# Publishing repo can't just pretend they are old repo. When pushing to |
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# a publishing repo, the client still need to push phase boundary |
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# |
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# Push do not only push changeset. It also push phase data. New |
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# phase data may apply to common changeset which won't be push (as they |
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# are common). Here is a very simple example: |
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# |
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# 1) repo A push changeset X as draft to repo B |
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# 2) repo B make changeset X public |
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# 3) repo B push to repo A. X is not pushed but the data that X as now |
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# public should |
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# |
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# The server can't handle it on it's own as it has no idea of client |
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# phase data. |
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keys['publishing'] = 'True' |
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return keys |
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def pushphase(repo, nhex, oldphasestr, newphasestr): |
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"""List phases root for serialisation over pushkey""" |
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lock = repo.lock() |
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try: |
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currentphase = repo[nhex].phase() |
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newphase = abs(int(newphasestr)) # let's avoid negative index surprise |
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oldphase = abs(int(oldphasestr)) # let's avoid negative index surprise |
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if currentphase == oldphase and newphase < oldphase: |
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advanceboundary(repo, newphase, [bin(nhex)]) |
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return 1 |
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else: |
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return 0 |
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finally: |
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lock.release() |
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def visibleheads(repo): |
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"""return the set of visible head of this repo""" |
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# XXX we want a cache on this |
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sroots = repo._phaseroots[secret] |
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if sroots: |
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# XXX very slow revset. storing heads or secret "boundary" would help. |
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revset = repo.set('heads(not (%ln::))', sroots) |
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vheads = [ctx.node() for ctx in revset] |
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if not vheads: |
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vheads.append(nullid) |
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else: |
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vheads = repo.heads() |
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return vheads |
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def analyzeremotephases(repo, subset, roots): |
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"""Compute phases heads and root in a subset of node from root dict |
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|
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* subset is heads of the subset |
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* roots is {<nodeid> => phase} mapping. key and value are string. |
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Accept unknown element input |
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""" |
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# build list from dictionary |
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draftroots = [] |
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nm = repo.changelog.nodemap # to filter unknown node |
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for nhex, phase in roots.iteritems(): |
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if nhex == 'publishing': # ignore data related to publish option |
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continue |
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node = bin(nhex) |
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phase = int(phase) |
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if phase == 0: |
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if node != nullid: |
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msg = _('ignoring inconsistense public root from remote: %s') |
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repo.ui.warn(msg, nhex) |
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elif phase == 1: |
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if node in nm: |
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draftroots.append(node) |
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else: |
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msg = _('ignoring unexpected root from remote: %i %s') |
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repo.ui.warn(msg, phase, nhex) |
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# compute heads |
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revset = repo.set('heads((%ln + parents(%ln)) - (%ln::%ln))', |
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subset, draftroots, draftroots, subset) |
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publicheads = [c.node() for c in revset] |
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return publicheads, draftroots |
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