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Add 'git svn reset' to unwind 'git svn fetch'
Add a command to unwind the effects of fetch by moving the rev_map and refs/remotes/git-svn back to an old SVN revision. This allows revisions to be re-fetched. Ideally SVN revs would be immutable, but permissions changes in the SVN repository or indiscriminate use of '--ignore-paths' can create situations where fetch cannot make progress. Signed-off-by: Ben Jackson <ben@ben.com> Acked-by: Eric Wong <normalperson@yhbt.net>
This commit is contained in:
Ben Jackson
Eric Wong
parent
ca5e880ec2
commit
195643f2fc
@ -216,7 +216,7 @@ config key: svn.commiturl (overwrites all svn-remote.<name>.commiturl options)
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The following features from `svn log' are supported:
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+
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--
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--revision=<n>[:<n>];;
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-r/--revision=<n>[:<n>];;
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is supported, non-numeric args are not:
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HEAD, NEXT, BASE, PREV, etc ...
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-v/--verbose;;
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@ -314,6 +314,63 @@ Any other arguments are passed directly to 'git-log'
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Shows the Subversion externals. Use -r/--revision to specify a
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specific revision.
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'reset'::
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Undoes the effects of 'fetch' back to the specified revision.
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This allows you to re-'fetch' an SVN revision. Normally the
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contents of an SVN revision should never change and 'reset'
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should not be necessary. However, if SVN permissions change,
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or if you alter your --ignore-paths option, a 'fetch' may fail
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with "not found in commit" (file not previously visible) or
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"checksum mismatch" (missed a modification). If the problem
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file cannot be ignored forever (with --ignore-paths) the only
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way to repair the repo is to use 'reset'.
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Only the rev_map and refs/remotes/git-svn are changed. Follow 'reset'
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with a 'fetch' and then 'git-reset' or 'git-rebase' to move local
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branches onto the new tree.
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-r/--revision=<n>;;
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Specify the most recent revision to keep. All later revisions
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are discarded.
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-p/--parent;;
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Discard the specified revision as well, keeping the nearest
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parent instead.
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Example:;;
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Assume you have local changes in "master", but you need to refetch "r2".
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------------
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r1---r2---r3 remotes/git-svn
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\
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A---B master
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------------
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Fix the ignore-paths or SVN permissions problem that caused "r2" to
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be incomplete in the first place. Then:
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[verse]
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git svn reset -r2 -p
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git svn fetch
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------------
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r1---r2'--r3' remotes/git-svn
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\
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r2---r3---A---B master
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------------
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Then fixup "master" with 'git-rebase'.
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Do NOT use 'git-merge' or your history will not be compatible with a
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future 'dcommit'!
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[verse]
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git rebase --onto remotes/git-svn A^ master
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------------
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r1---r2'--r3' remotes/git-svn
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\
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A'--B' master
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------------
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--
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OPTIONS
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45
git-svn.perl
45
git-svn.perl
@ -211,6 +211,10 @@ my %cmd = (
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'blame' => [ \&Git::SVN::Log::cmd_blame,
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"Show what revision and author last modified each line of a file",
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{ 'git-format' => \$_git_format } ],
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'reset' => [ \&cmd_reset,
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"Undo fetches back to the specified SVN revision",
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{ 'revision|r=s' => \$_revision,
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'parent|p' => \$_fetch_parent } ],
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);
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my $cmd;
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@ -1054,6 +1058,20 @@ sub cmd_info {
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print $result, "\n";
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}
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sub cmd_reset {
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my $target = shift || $_revision or die "SVN revision required\n";
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$target = $1 if $target =~ /^r(\d+)$/;
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$target =~ /^\d+$/ or die "Numeric SVN revision expected\n";
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my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
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unless ($gs) {
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die "Unable to determine upstream SVN information from ".
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"history\n";
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}
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my ($r, $c) = $gs->find_rev_before($target, not $_fetch_parent);
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$gs->rev_map_set($r, $c, 'reset', $uuid);
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print "r$r = $c ($gs->{ref_id})\n";
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}
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########################### utility functions #########################
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sub rebase_cmd {
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@ -3023,6 +3041,14 @@ sub _rev_map_set {
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croak "write: $!";
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}
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sub _rev_map_reset {
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my ($fh, $rev, $commit) = @_;
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my $c = _rev_map_get($fh, $rev);
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$c eq $commit or die "_rev_map_reset(@_) commit $c does not match!\n";
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my $offset = sysseek($fh, 0, SEEK_CUR) or croak "seek: $!";
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truncate $fh, $offset or croak "truncate: $!";
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}
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sub mkfile {
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my ($path) = @_;
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unless (-e $path) {
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@ -3039,6 +3065,7 @@ sub rev_map_set {
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my $db = $self->map_path($uuid);
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my $db_lock = "$db.lock";
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my $sig;
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$update_ref ||= 0;
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if ($update_ref) {
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$SIG{INT} = $SIG{HUP} = $SIG{TERM} = $SIG{ALRM} = $SIG{PIPE} =
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$SIG{USR1} = $SIG{USR2} = sub { $sig = $_[0] };
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@ -3062,7 +3089,8 @@ sub rev_map_set {
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sysopen(my $fh, $db_lock, O_RDWR | O_CREAT)
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or croak "Couldn't open $db_lock: $!\n";
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_rev_map_set($fh, $rev, $commit);
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$update_ref eq 'reset' ? _rev_map_reset($fh, $rev, $commit) :
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_rev_map_set($fh, $rev, $commit);
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if ($sync) {
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$fh->flush or die "Couldn't flush $db_lock: $!\n";
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$fh->sync or die "Couldn't sync $db_lock: $!\n";
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@ -3070,7 +3098,9 @@ sub rev_map_set {
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close $fh or croak $!;
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if ($update_ref) {
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$_head = $self;
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command_noisy('update-ref', '-m', "r$rev",
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my $note = "";
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$note = " ($update_ref)" if ($update_ref !~ /^\d*$/);
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command_noisy('update-ref', '-m', "r$rev$note",
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$self->refname, $commit);
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}
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rename $db_lock, $db or die "rev_map_set(@_): ", "Failed to rename: ",
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@ -3132,12 +3162,19 @@ sub rev_map_get {
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return undef unless -e $map_path;
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sysopen(my $fh, $map_path, O_RDONLY) or croak "open: $!";
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my $c = _rev_map_get($fh, $rev);
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close($fh) or croak "close: $!";
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$c
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}
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sub _rev_map_get {
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my ($fh, $rev) = @_;
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binmode $fh or croak "binmode: $!";
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my $size = (stat($fh))[7];
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($size % 24) == 0 or croak "inconsistent size: $size";
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if ($size == 0) {
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close $fh or croak "close: $fh";
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return undef;
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}
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@ -3155,11 +3192,9 @@ sub rev_map_get {
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} elsif ($r > $rev) {
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$u = $i - 24;
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} else { # $r == $rev
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close($fh) or croak "close: $!";
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return $c eq ('0' x 40) ? undef : $c;
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}
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}
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close($fh) or croak "close: $!";
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undef;
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}
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66
t/t9139-git-svn-reset.sh
Executable file
66
t/t9139-git-svn-reset.sh
Executable file
@ -0,0 +1,66 @@
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#!/bin/sh
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#
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# Copyright (c) 2009 Ben Jackson
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#
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test_description='git svn reset'
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. ./lib-git-svn.sh
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test_expect_success 'setup test repository' '
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svn_cmd co "$svnrepo" s &&
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(
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cd s &&
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mkdir vis &&
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echo always visible > vis/vis.txt &&
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svn_cmd add vis &&
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svn_cmd commit -m "create visible files" &&
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mkdir hid &&
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echo initially hidden > hid/hid.txt &&
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svn_cmd add hid &&
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svn_cmd commit -m "create initially hidden files" &&
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svn_cmd up &&
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echo mod >> vis/vis.txt &&
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svn_cmd commit -m "modify vis" &&
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svn_cmd up
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)
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'
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test_expect_success 'clone SVN repository with hidden directory' '
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git svn init "$svnrepo" g &&
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( cd g && git svn fetch --ignore-paths="^hid" )
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'
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test_expect_success 'modify hidden file in SVN repo' '
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( cd s &&
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echo mod hidden >> hid/hid.txt &&
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svn_cmd commit -m "modify hid" &&
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svn_cmd up
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)
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'
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test_expect_success 'fetch fails on modified hidden file' '
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( cd g &&
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git svn find-rev refs/remotes/git-svn > ../expect &&
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! git svn fetch 2> ../errors &&
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git svn find-rev refs/remotes/git-svn > ../expect2 ) &&
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fgrep "not found in commit" errors &&
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test_cmp expect expect2
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'
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test_expect_success 'reset unwinds back to r1' '
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( cd g &&
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git svn reset -r1 &&
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git svn find-rev refs/remotes/git-svn > ../expect2 ) &&
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echo 1 >expect &&
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test_cmp expect expect2
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'
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test_expect_success 'refetch succeeds not ignoring any files' '
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( cd g &&
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git svn fetch &&
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git svn rebase &&
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fgrep "mod hidden" hid/hid.txt
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)
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'
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test_done
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