hgext/fastexport.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Thu, 02 Feb 2023 17:38:14 +0100
changeset 50615 9e69d9d6f4cf
parent 50401 dd42156b6441
child 50875 00081fa564ed
permissions -rw-r--r--
safehasattr: pass attribute name as string instead of bytes This is a step toward replacing `util.safehasattr` usage with plain `hasattr`. The builtin function behave poorly in Python2 but this was fixed in Python3. These change are done one by one as they tend to have a small odd to trigger puzzling breackage.
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# Copyright 2020 Joerg Sonnenberger <joerg@bec.de>
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#
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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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"""export repositories as git fast-import stream"""
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# The format specification for fast-import streams can be found at
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# https://git-scm.com/docs/git-fast-import#_input_format
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import re
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from mercurial.i18n import _
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from mercurial.node import hex, nullrev
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from mercurial.utils import stringutil
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from mercurial import (
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    error,
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    logcmdutil,
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    pycompat,
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    registrar,
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    scmutil,
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)
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from .convert import convcmd
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# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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# be specifying the version(s) of Mercurial they are tested with, or
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# leave the attribute unspecified.
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testedwith = b"ships-with-hg-core"
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cmdtable = {}
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command = registrar.command(cmdtable)
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GIT_PERSON_PROHIBITED = re.compile(b'[<>\n"]')
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GIT_EMAIL_PROHIBITED = re.compile(b"[<> \n]")
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def convert_to_git_user(authormap, user, rev):
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    mapped_user = authormap.get(user, user)
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    user_person = stringutil.person(mapped_user)
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    user_email = stringutil.email(mapped_user)
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    if GIT_EMAIL_PROHIBITED.match(user_email) or GIT_PERSON_PROHIBITED.match(
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        user_person
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    ):
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        raise error.Abort(
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            _(b"Unable to parse user into person and email for revision %s")
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            % rev
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        )
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    if user_person:
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        return b'"' + user_person + b'" <' + user_email + b'>'
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    else:
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        return b"<" + user_email + b">"
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def convert_to_git_date(date):
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    timestamp, utcoff = date
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    tzsign = b"+" if utcoff <= 0 else b"-"
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    if utcoff % 60 != 0:
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        raise error.Abort(
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            _(b"UTC offset in %b is not an integer number of seconds") % (date,)
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        )
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    utcoff = abs(utcoff) // 60
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    tzh = utcoff // 60
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    tzmin = utcoff % 60
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    return b"%d " % int(timestamp) + tzsign + b"%02d%02d" % (tzh, tzmin)
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def convert_to_git_ref(branch):
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    # XXX filter/map depending on git restrictions
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    return b"refs/heads/" + branch
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def write_data(buf, data, add_newline=False):
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    buf.append(b"data %d\n" % len(data))
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    buf.append(data)
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    if add_newline or data[-1:] != b"\n":
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        buf.append(b"\n")
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def export_commit(ui, repo, rev, marks, authormap):
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    ctx = repo[rev]
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    revid = ctx.hex()
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    if revid in marks:
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        ui.debug(b"warning: revision %s already exported, skipped\n" % revid)
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        return
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    parents = [p for p in ctx.parents() if p.rev() != nullrev]
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    for p in parents:
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        if p.hex() not in marks:
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            ui.warn(
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                _(b"warning: parent %s of %s has not been exported, skipped\n")
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                % (p, revid)
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            )
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            return
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    # For all files modified by the commit, check if they have already
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    # been exported and otherwise dump the blob with the new mark.
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    for fname in ctx.files():
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        if fname not in ctx:
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            continue
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        filectx = ctx.filectx(fname)
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        filerev = hex(filectx.filenode())
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        if filerev not in marks:
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            mark = len(marks) + 1
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            marks[filerev] = mark
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            data = filectx.data()
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            buf = [b"blob\n", b"mark :%d\n" % mark]
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            write_data(buf, data, True)
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            ui.write(*buf, keepprogressbar=True)
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            del buf
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    # Assign a mark for the current revision for references by
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    # latter merge commits.
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    mark = len(marks) + 1
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    marks[revid] = mark
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    ref = convert_to_git_ref(ctx.branch())
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    buf = [
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        b"commit %s\n" % ref,
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        b"mark :%d\n" % mark,
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        b"committer %s %s\n"
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        % (
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            convert_to_git_user(authormap, ctx.user(), revid),
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            convert_to_git_date(ctx.date()),
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        ),
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    ]
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    write_data(buf, ctx.description())
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    if parents:
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        buf.append(b"from :%d\n" % marks[parents[0].hex()])
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    if len(parents) == 2:
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        buf.append(b"merge :%d\n" % marks[parents[1].hex()])
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        p0ctx = repo[parents[0]]
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        files = ctx.manifest().diff(p0ctx.manifest())
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    else:
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        files = ctx.files()
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    filebuf = []
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    for fname in files:
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        if fname not in ctx:
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            filebuf.append((fname, b"D %s\n" % fname))
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        else:
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            filectx = ctx.filectx(fname)
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            filerev = filectx.filenode()
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            fileperm = b"755" if filectx.isexec() else b"644"
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            changed = b"M %s :%d %s\n" % (fileperm, marks[hex(filerev)], fname)
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            filebuf.append((fname, changed))
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    filebuf.sort()
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    buf.extend(changed for (fname, changed) in filebuf)
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    del filebuf
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    buf.append(b"\n")
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    ui.write(*buf, keepprogressbar=True)
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    del buf
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isrev = re.compile(b"^[0-9a-f]{40}$")
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@command(
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    b"fastexport",
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    [
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        (b"r", b"rev", [], _(b"revisions to export"), _(b"REV")),
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        (b"i", b"import-marks", b"", _(b"old marks file to read"), _(b"FILE")),
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        (b"e", b"export-marks", b"", _(b"new marks file to write"), _(b"FILE")),
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        (
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            b"A",
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            b"authormap",
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            b"",
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            _(b"remap usernames using this file"),
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            _(b"FILE"),
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        ),
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    ],
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    _(b"[OPTION]... [REV]..."),
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    helpcategory=command.CATEGORY_IMPORT_EXPORT,
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)
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def fastexport(ui, repo, *revs, **opts):
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    """export repository as git fast-import stream
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    This command lets you dump a repository as a human-readable text stream.
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    It can be piped into corresponding import routines like "git fast-import".
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    Incremental dumps can be created by using marks files.
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    """
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    opts = pycompat.byteskwargs(opts)
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    revs += tuple(opts.get(b"rev", []))
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    if not revs:
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        revs = scmutil.revrange(repo, [b":"])
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    else:
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        revs = logcmdutil.revrange(repo, revs)
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    if not revs:
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        raise error.Abort(_(b"no revisions matched"))
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    authorfile = opts.get(b"authormap")
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    if authorfile:
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        authormap = convcmd.readauthormap(ui, authorfile)
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    else:
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        authormap = {}
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    import_marks = opts.get(b"import_marks")
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    marks = {}
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    if import_marks:
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        with open(import_marks, "rb") as import_marks_file:
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            for line in import_marks_file:
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                line = line.strip()
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                if not isrev.match(line) or line in marks:
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                    raise error.Abort(_(b"Corrupted marks file"))
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                marks[line] = len(marks) + 1
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    revs.sort()
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    with ui.makeprogress(
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        _(b"exporting"), unit=_(b"revisions"), total=len(revs)
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    ) as progress:
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        for rev in revs:
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            export_commit(ui, repo, rev, marks, authormap)
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            progress.increment()
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    export_marks = opts.get(b"export_marks")
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    if export_marks:
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        with open(export_marks, "wb") as export_marks_file:
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            output_marks = [None] * len(marks)
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            for k, v in marks.items():
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                output_marks[v - 1] = k
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            for k in output_marks:
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                export_marks_file.write(k + b"\n")