comparison mercurial/commit.py @ 45204:ce9ee81df9ff

commitctx: extract _filecommit too

This function is exclusively used in `commitctx`. So we should extract it too
for consistency and to reduce the `localrepo` bloat.

This is part of a larger refactoring/cleanup of the commitctx code to clarify
and augment the logic gathering metadata useful for copy tracing. The current
code is a tad too long and entangled to make such update easy.

Differential Revision: https://phab.mercurial-scm.org/D8710

45203:ae5c1a3bc339

import weakref

from .i18n import _
from .node import (
    hex,
    nullrev,
)

from . import (
    metadata,
    phases,
    scmutil,
    subrepoutil,
)

                    fctx = ctx[f]
                    if fctx is None:
                        removed.append(f)
                    else:
                        added.append(f)
                        m[f], is_touched = repo._filecommit(
                            fctx, m1, m2, linkrev, trp, writefilecopymeta,
                        )
                        if is_touched:
                            touched.append(f)
                            if writechangesetcopy and is_touched == 'added':
                                filesadded.append(f)

            # be compliant anyway
            #
            # if minimal phase was 0 we don't need to retract anything
            phases.registernew(repo, tr, targetphase, [n])
        return n

45204:ce9ee81df9ff

import weakref

from .i18n import _
from .node import (
    hex,
    nullid,
    nullrev,
)

from . import (
    context,
    mergestate,
    metadata,
    phases,
    scmutil,
    subrepoutil,
)

                    fctx = ctx[f]
                    if fctx is None:
                        removed.append(f)
                    else:
                        added.append(f)
                        m[f], is_touched = _filecommit(
                            repo, fctx, m1, m2, linkrev, trp, writefilecopymeta,
                        )
                        if is_touched:
                            touched.append(f)
                            if writechangesetcopy and is_touched == 'added':
                                filesadded.append(f)

            # be compliant anyway
            #
            # if minimal phase was 0 we don't need to retract anything
            phases.registernew(repo, tr, targetphase, [n])
        return n


def _filecommit(
    repo, fctx, manifest1, manifest2, linkrev, tr, includecopymeta,
):
    """
    commit an individual file as part of a larger transaction

    input:

        fctx:       a file context with the content we are trying to commit
        manifest1:  manifest of changeset first parent
        manifest2:  manifest of changeset second parent
        linkrev:    revision number of the changeset being created
        tr:         current transation
        individual: boolean, set to False to skip storing the copy data
                    (only used by the Google specific feature of using
                    changeset extra as copy source of truth).

    output: (filenode, touched)

        filenode: the filenode that should be used by this changeset
        touched:  one of: None, 'added' or 'modified'
    """

    fname = fctx.path()
    fparent1 = manifest1.get(fname, nullid)
    fparent2 = manifest2.get(fname, nullid)
    touched = None
    if fparent1 == fparent2 == nullid:
        touched = 'added'

    if isinstance(fctx, context.filectx):
        # This block fast path most comparisons which are usually done. It
        # assumes that bare filectx is used and no merge happened, hence no
        # need to create a new file revision in this case.
        node = fctx.filenode()
        if node in [fparent1, fparent2]:
            repo.ui.debug(b'reusing %s filelog entry\n' % fname)
            if (
                fparent1 != nullid and manifest1.flags(fname) != fctx.flags()
            ) or (
                fparent2 != nullid and manifest2.flags(fname) != fctx.flags()
            ):
                touched = 'modified'
            return node, touched

    flog = repo.file(fname)
    meta = {}
    cfname = fctx.copysource()
    fnode = None

    if cfname and cfname != fname:
        # Mark the new revision of this file as a copy of another
        # file.  This copy data will effectively act as a parent
        # of this new revision.  If this is a merge, the first
        # parent will be the nullid (meaning "look up the copy data")
        # and the second one will be the other parent.  For example:
        #
        # 0 --- 1 --- 3   rev1 changes file foo
        #   \       /     rev2 renames foo to bar and changes it
        #    \- 2 -/      rev3 should have bar with all changes and
        #                      should record that bar descends from
        #                      bar in rev2 and foo in rev1
        #
        # this allows this merge to succeed:
        #
        # 0 --- 1 --- 3   rev4 reverts the content change from rev2
        #   \       /     merging rev3 and rev4 should use bar@rev2
        #    \- 2 --- 4        as the merge base
        #

        cnode = manifest1.get(cfname)
        newfparent = fparent2

        if manifest2:  # branch merge
            if fparent2 == nullid or cnode is None:  # copied on remote side
                if cfname in manifest2:
                    cnode = manifest2[cfname]
                    newfparent = fparent1

        # Here, we used to search backwards through history to try to find
        # where the file copy came from if the source of a copy was not in
        # the parent directory. However, this doesn't actually make sense to
        # do (what does a copy from something not in your working copy even
        # mean?) and it causes bugs (eg, issue4476). Instead, we will warn
        # the user that copy information was dropped, so if they didn't
        # expect this outcome it can be fixed, but this is the correct
        # behavior in this circumstance.

        if cnode:
            repo.ui.debug(b" %s: copy %s:%s\n" % (fname, cfname, hex(cnode)))
            if includecopymeta:
                meta[b"copy"] = cfname
                meta[b"copyrev"] = hex(cnode)
            fparent1, fparent2 = nullid, newfparent
        else:
            repo.ui.warn(
                _(
                    b"warning: can't find ancestor for '%s' "
                    b"copied from '%s'!\n"
                )
                % (fname, cfname)
            )

    elif fparent1 == nullid:
        fparent1, fparent2 = fparent2, nullid
    elif fparent2 != nullid:
        # is one parent an ancestor of the other?
        fparentancestors = flog.commonancestorsheads(fparent1, fparent2)
        if fparent1 in fparentancestors:
            fparent1, fparent2 = fparent2, nullid
        elif fparent2 in fparentancestors:
            fparent2 = nullid
        elif not fparentancestors:
            # TODO: this whole if-else might be simplified much more
            ms = mergestate.mergestate.read(repo)
            if (
                fname in ms
                and ms[fname] == mergestate.MERGE_RECORD_MERGED_OTHER
            ):
                fparent1, fparent2 = fparent2, nullid

    # is the file changed?
    text = fctx.data()
    if fparent2 != nullid or meta or flog.cmp(fparent1, text):
        if touched is None:  # do not overwrite added
            touched = 'modified'
        fnode = flog.add(text, meta, tr, linkrev, fparent1, fparent2)
    # are just the flags changed during merge?
    elif fname in manifest1 and manifest1.flags(fname) != fctx.flags():
        touched = 'modified'
        fnode = fparent1
    else:
        fnode = fparent1
    return fnode, touched