diff options
Diffstat (limited to 'git-gui/lib/checkout_op.tcl')
| -rw-r--r-- | git-gui/lib/checkout_op.tcl | 588 |
1 files changed, 588 insertions, 0 deletions
diff --git a/git-gui/lib/checkout_op.tcl b/git-gui/lib/checkout_op.tcl new file mode 100644 index 0000000000..170f737f61 --- /dev/null +++ b/git-gui/lib/checkout_op.tcl @@ -0,0 +1,588 @@ +# git-gui commit checkout support +# Copyright (C) 2007 Shawn Pearce + +class checkout_op { + +field w {}; # our window (if we have one) +field w_cons {}; # embedded console window object + +field new_expr ; # expression the user saw/thinks this is +field new_hash ; # commit SHA-1 we are switching to +field new_ref ; # ref we are updating/creating + +field parent_w .; # window that started us +field merge_type none; # type of merge to apply to existing branch +field merge_base {}; # merge base if we have another ref involved +field fetch_spec {}; # refetch tracking branch if used? +field checkout 1; # actually checkout the branch? +field create 0; # create the branch if it doesn't exist? + +field reset_ok 0; # did the user agree to reset? +field fetch_ok 0; # did the fetch succeed? + +field readtree_d {}; # buffered output from read-tree +field update_old {}; # was the update-ref call deferred? +field reflog_msg {}; # log message for the update-ref call + +constructor new {expr hash {ref {}}} { + set new_expr $expr + set new_hash $hash + set new_ref $ref + + return $this +} + +method parent {path} { + set parent_w [winfo toplevel $path] +} + +method enable_merge {type} { + set merge_type $type +} + +method enable_fetch {spec} { + set fetch_spec $spec +} + +method enable_checkout {co} { + set checkout $co +} + +method enable_create {co} { + set create $co +} + +method run {} { + if {$fetch_spec ne {}} { + global M1B + + # We were asked to refresh a single tracking branch + # before we get to work. We should do that before we + # consider any ref updating. + # + set fetch_ok 0 + set l_trck [lindex $fetch_spec 0] + set remote [lindex $fetch_spec 1] + set r_head [lindex $fetch_spec 2] + regsub ^refs/heads/ $r_head {} r_name + + set cmd [list git fetch $remote] + if {$l_trck ne {}} { + lappend cmd +$r_head:$l_trck + } else { + lappend cmd $r_head + } + + _toplevel $this {Refreshing Tracking Branch} + set w_cons [::console::embed \ + $w.console \ + "Fetching $r_name from $remote"] + pack $w.console -fill both -expand 1 + $w_cons exec $cmd [cb _finish_fetch] + + bind $w <$M1B-Key-w> break + bind $w <$M1B-Key-W> break + bind $w <Visibility> " + [list grab $w] + [list focus $w] + " + wm protocol $w WM_DELETE_WINDOW [cb _noop] + tkwait window $w + + if {!$fetch_ok} { + delete_this + return 0 + } + } + + if {$new_ref ne {}} { + # If we have a ref we need to update it before we can + # proceed with a checkout (if one was enabled). + # + if {![_update_ref $this]} { + delete_this + return 0 + } + } + + if {$checkout} { + _checkout $this + return 1 + } + + delete_this + return 1 +} + +method _noop {} {} + +method _finish_fetch {ok} { + if {$ok} { + set l_trck [lindex $fetch_spec 0] + if {$l_trck eq {}} { + set l_trck FETCH_HEAD + } + if {[catch {set new_hash [git rev-parse --verify "$l_trck^0"]} err]} { + set ok 0 + $w_cons insert "fatal: Cannot resolve $l_trck" + $w_cons insert $err + } + } + + $w_cons done $ok + set w_cons {} + wm protocol $w WM_DELETE_WINDOW {} + + if {$ok} { + destroy $w + set w {} + } else { + button $w.close -text Close -command [list destroy $w] + pack $w.close -side bottom -anchor e -padx 10 -pady 10 + } + + set fetch_ok $ok +} + +method _update_ref {} { + global null_sha1 current_branch + + set ref $new_ref + set new $new_hash + + set is_current 0 + set rh refs/heads/ + set rn [string length $rh] + if {[string equal -length $rn $rh $ref]} { + set newbranch [string range $ref $rn end] + if {$current_branch eq $newbranch} { + set is_current 1 + } + } else { + set newbranch $ref + } + + if {[catch {set cur [git rev-parse --verify "$ref^0"]}]} { + # Assume it does not exist, and that is what the error was. + # + if {!$create} { + _error $this "Branch '$newbranch' does not exist." + return 0 + } + + set reflog_msg "branch: Created from $new_expr" + set cur $null_sha1 + } elseif {$create && $merge_type eq {none}} { + # We were told to create it, but not do a merge. + # Bad. Name shouldn't have existed. + # + _error $this "Branch '$newbranch' already exists." + return 0 + } elseif {!$create && $merge_type eq {none}} { + # We aren't creating, it exists and we don't merge. + # We are probably just a simple branch switch. + # Use whatever value we just read. + # + set new $cur + set new_hash $cur + } elseif {$new eq $cur} { + # No merge would be required, don't compute anything. + # + } else { + catch {set merge_base [git merge-base $new $cur]} + if {$merge_base eq $cur} { + # The current branch is older. + # + set reflog_msg "merge $new_expr: Fast-forward" + } else { + switch -- $merge_type { + ff { + if {$merge_base eq $new} { + # The current branch is actually newer. + # + set new $cur + set new_hash $cur + } else { + _error $this "Branch '$newbranch' already exists.\n\nIt cannot fast-forward to $new_expr.\nA merge is required." + return 0 + } + } + reset { + # The current branch will lose things. + # + if {[_confirm_reset $this $cur]} { + set reflog_msg "reset $new_expr" + } else { + return 0 + } + } + default { + _error $this "Merge strategy '$merge_type' not supported." + return 0 + } + } + } + } + + if {$new ne $cur} { + if {$is_current} { + # No so fast. We should defer this in case + # we cannot update the working directory. + # + set update_old $cur + return 1 + } + + if {[catch { + git update-ref -m $reflog_msg $ref $new $cur + } err]} { + _error $this "Failed to update '$newbranch'.\n\n$err" + return 0 + } + } + + return 1 +} + +method _checkout {} { + if {[lock_index checkout_op]} { + after idle [cb _start_checkout] + } else { + _error $this "Staging area (index) is already locked." + delete_this + } +} + +method _start_checkout {} { + global HEAD commit_type + + # -- Our in memory state should match the repository. + # + repository_state curType curHEAD curMERGE_HEAD + if {[string match amend* $commit_type] + && $curType eq {normal} + && $curHEAD eq $HEAD} { + } elseif {$commit_type ne $curType || $HEAD ne $curHEAD} { + info_popup {Last scanned state does not match repository state. + +Another Git program has modified this repository since the last scan. A rescan must be performed before the current branch can be changed. + +The rescan will be automatically started now. +} + unlock_index + rescan ui_ready + delete_this + return + } + + if {$curHEAD eq $new_hash} { + _after_readtree $this + } elseif {[is_config_true gui.trustmtime]} { + _readtree $this + } else { + ui_status {Refreshing file status...} + set fd [git_read update-index \ + -q \ + --unmerged \ + --ignore-missing \ + --refresh \ + ] + fconfigure $fd -blocking 0 -translation binary + fileevent $fd readable [cb _refresh_wait $fd] + } +} + +method _refresh_wait {fd} { + read $fd + if {[eof $fd]} { + close $fd + _readtree $this + } +} + +method _name {} { + if {$new_ref eq {}} { + return [string range $new_hash 0 7] + } + + set rh refs/heads/ + set rn [string length $rh] + if {[string equal -length $rn $rh $new_ref]} { + return [string range $new_ref $rn end] + } else { + return $new_ref + } +} + +method _readtree {} { + global HEAD + + set readtree_d {} + $::main_status start \ + "Updating working directory to '[_name $this]'..." \ + {files checked out} + + set fd [git_read --stderr read-tree \ + -m \ + -u \ + -v \ + --exclude-per-directory=.gitignore \ + $HEAD \ + $new_hash \ + ] + fconfigure $fd -blocking 0 -translation binary + fileevent $fd readable [cb _readtree_wait $fd] +} + +method _readtree_wait {fd} { + global current_branch + + set buf [read $fd] + $::main_status update_meter $buf + append readtree_d $buf + + fconfigure $fd -blocking 1 + if {![eof $fd]} { + fconfigure $fd -blocking 0 + return + } + + if {[catch {close $fd}]} { + set err $readtree_d + regsub {^fatal: } $err {} err + $::main_status stop "Aborted checkout of '[_name $this]' (file level merging is required)." + warn_popup "File level merge required. + +$err + +Staying on branch '$current_branch'." + unlock_index + delete_this + return + } + + $::main_status stop + _after_readtree $this +} + +method _after_readtree {} { + global selected_commit_type commit_type HEAD MERGE_HEAD PARENT + global current_branch is_detached + global ui_comm + + set name [_name $this] + set log "checkout: moving" + if {!$is_detached} { + append log " from $current_branch" + } + + # -- Move/create HEAD as a symbolic ref. Core git does not + # even check for failure here, it Just Works(tm). If it + # doesn't we are in some really ugly state that is difficult + # to recover from within git-gui. + # + set rh refs/heads/ + set rn [string length $rh] + if {[string equal -length $rn $rh $new_ref]} { + set new_branch [string range $new_ref $rn end] + if {$is_detached || $current_branch ne $new_branch} { + append log " to $new_branch" + if {[catch { + git symbolic-ref -m $log HEAD $new_ref + } err]} { + _fatal $this $err + } + set current_branch $new_branch + set is_detached 0 + } + } else { + if {$new_hash ne $HEAD} { + append log " to $new_expr" + if {[catch { + _detach_HEAD $log $new_hash + } err]} { + _fatal $this $err + } + } + set current_branch HEAD + set is_detached 1 + } + + # -- We had to defer updating the branch itself until we + # knew the working directory would update. So now we + # need to finish that work. If it fails we're in big + # trouble. + # + if {$update_old ne {}} { + if {[catch { + git update-ref \ + -m $reflog_msg \ + $new_ref \ + $new_hash \ + $update_old + } err]} { + _fatal $this $err + } + } + + if {$is_detached} { + info_popup "You are no longer on a local branch. + +If you wanted to be on a branch, create one now starting from 'This Detached Checkout'." + } + + # -- Update our repository state. If we were previously in + # amend mode we need to toss the current buffer and do a + # full rescan to update our file lists. If we weren't in + # amend mode our file lists are accurate and we can avoid + # the rescan. + # + unlock_index + set selected_commit_type new + if {[string match amend* $commit_type]} { + $ui_comm delete 0.0 end + $ui_comm edit reset + $ui_comm edit modified false + rescan [list ui_status "Checked out '$name'."] + } else { + repository_state commit_type HEAD MERGE_HEAD + set PARENT $HEAD + ui_status "Checked out '$name'." + } + delete_this +} + +git-version proc _detach_HEAD {log new} { + >= 1.5.3 { + git update-ref --no-deref -m $log HEAD $new + } + default { + set p [gitdir HEAD] + file delete $p + set fd [open $p w] + fconfigure $fd -translation lf -encoding utf-8 + puts $fd $new + close $fd + } +} + +method _confirm_reset {cur} { + set reset_ok 0 + set name [_name $this] + set gitk [list do_gitk [list $cur ^$new_hash]] + + _toplevel $this {Confirm Branch Reset} + pack [label $w.msg1 \ + -anchor w \ + -justify left \ + -text "Resetting '$name' to $new_expr will lose the following commits:" \ + ] -anchor w + + set list $w.list.l + frame $w.list + text $list \ + -font font_diff \ + -width 80 \ + -height 10 \ + -wrap none \ + -xscrollcommand [list $w.list.sbx set] \ + -yscrollcommand [list $w.list.sby set] + scrollbar $w.list.sbx -orient h -command [list $list xview] + scrollbar $w.list.sby -orient v -command [list $list yview] + pack $w.list.sbx -fill x -side bottom + pack $w.list.sby -fill y -side right + pack $list -fill both -expand 1 + pack $w.list -fill both -expand 1 -padx 5 -pady 5 + + pack [label $w.msg2 \ + -anchor w \ + -justify left \ + -text {Recovering lost commits may not be easy.} \ + ] + pack [label $w.msg3 \ + -anchor w \ + -justify left \ + -text "Reset '$name'?" \ + ] + + frame $w.buttons + button $w.buttons.visualize \ + -text Visualize \ + -command $gitk + pack $w.buttons.visualize -side left + button $w.buttons.reset \ + -text Reset \ + -command " + set @reset_ok 1 + destroy $w + " + pack $w.buttons.reset -side right + button $w.buttons.cancel \ + -default active \ + -text Cancel \ + -command [list destroy $w] + pack $w.buttons.cancel -side right -padx 5 + pack $w.buttons -side bottom -fill x -pady 10 -padx 10 + + set fd [git_read rev-list --pretty=oneline $cur ^$new_hash] + while {[gets $fd line] > 0} { + set abbr [string range $line 0 7] + set subj [string range $line 41 end] + $list insert end "$abbr $subj\n" + } + close $fd + $list configure -state disabled + + bind $w <Key-v> $gitk + bind $w <Visibility> " + grab $w + focus $w.buttons.cancel + " + bind $w <Key-Return> [list destroy $w] + bind $w <Key-Escape> [list destroy $w] + tkwait window $w + return $reset_ok +} + +method _error {msg} { + if {[winfo ismapped $parent_w]} { + set p $parent_w + } else { + set p . + } + + tk_messageBox \ + -icon error \ + -type ok \ + -title [wm title $p] \ + -parent $p \ + -message $msg +} + +method _toplevel {title} { + regsub -all {::} $this {__} w + set w .$w + + if {[winfo ismapped $parent_w]} { + set p $parent_w + } else { + set p . + } + + toplevel $w + wm title $w $title + wm geometry $w "+[winfo rootx $p]+[winfo rooty $p]" +} + +method _fatal {err} { + error_popup "Failed to set current branch. + +This working directory is only partially switched. We successfully updated your files, but failed to update an internal Git file. + +This should not have occurred. [appname] will now close and give up. + +$err" + exit 1 +} + +} |