diff --git a/git-gui/git-gui.sh b/git-gui/git-gui.sh
index fcb2ab2fb7..f42e461fd4 100755
--- a/git-gui/git-gui.sh
+++ b/git-gui/git-gui.sh
@@ -438,6 +438,34 @@ proc git_write {args} {
 	return [open [concat $opt $cmdp $args] w]
 }
 
+proc githook_read {hook_name args} {
+	set pchook [gitdir hooks $hook_name]
+	lappend args 2>@1
+
+	# On Cygwin [file executable] might lie so we need to ask
+	# the shell if the hook is executable.  Yes that's annoying.
+	#
+	if {[is_Cygwin]} {
+		upvar #0 _sh interp
+		if {![info exists interp]} {
+			set interp [_which sh]
+		}
+		if {$interp eq {}} {
+			error "hook execution requires sh (not in PATH)"
+		}
+
+		set scr {if test -x "$1";then exec "$@";fi}
+		set sh_c [list | $interp -c $scr $interp $pchook]
+		return [_open_stdout_stderr [concat $sh_c $args]]
+	}
+
+	if {[file executable $pchook]} {
+		return [_open_stdout_stderr [concat [list | $pchook] $args]]
+	}
+
+	return {}
+}
+
 proc sq {value} {
 	regsub -all ' $value "'\\''" value
 	return "'$value'"
diff --git a/git-gui/lib/commit.tcl b/git-gui/lib/commit.tcl
index 1c0586c409..947b201c32 100644
--- a/git-gui/lib/commit.tcl
+++ b/git-gui/lib/commit.tcl
@@ -192,45 +192,52 @@ A good commit message has the following format:
 		return
 	}
 
-	# -- Run the pre-commit hook.
+	# -- Build the message file.
 	#
-	set pchook [gitdir hooks pre-commit]
+	set msg_p [gitdir GITGUI_EDITMSG]
+	set msg_wt [open $msg_p w]
+	fconfigure $msg_wt -translation lf
+	if {[catch {set enc $repo_config(i18n.commitencoding)}]} {
+		set enc utf-8
+	}
+	set use_enc [tcl_encoding $enc]
+	if {$use_enc ne {}} {
+		fconfigure $msg_wt -encoding $use_enc
+	} else {
+		puts stderr [mc "warning: Tcl does not support encoding '%s'." $enc]
+		fconfigure $msg_wt -encoding utf-8
+	}
+	puts $msg_wt $msg
+	close $msg_wt
 
-	# On Cygwin [file executable] might lie so we need to ask
-	# the shell if the hook is executable.  Yes that's annoying.
+	# -- Run the pre-commit hook.
 	#
-	if {[is_Cygwin] && [file isfile $pchook]} {
-		set pchook [list sh -c [concat \
-			"if test -x \"$pchook\";" \
-			"then exec \"$pchook\" 2>&1;" \
-			"fi"]]
-	} elseif {[file executable $pchook]} {
-		set pchook [list $pchook |& cat]
-	} else {
-		commit_writetree $curHEAD $msg
+	set fd_ph [githook_read pre-commit]
+	if {$fd_ph eq {}} {
+		commit_commitmsg $curHEAD $msg_p
 		return
 	}
 
 	ui_status {Calling pre-commit hook...}
 	set pch_error {}
-	set fd_ph [open "| $pchook" r]
 	fconfigure $fd_ph -blocking 0 -translation binary -eofchar {}
 	fileevent $fd_ph readable \
-		[list commit_prehook_wait $fd_ph $curHEAD $msg]
+		[list commit_prehook_wait $fd_ph $curHEAD $msg_p]
 }
 
-proc commit_prehook_wait {fd_ph curHEAD msg} {
+proc commit_prehook_wait {fd_ph curHEAD msg_p} {
 	global pch_error
 
 	append pch_error [read $fd_ph]
 	fconfigure $fd_ph -blocking 1
 	if {[eof $fd_ph]} {
 		if {[catch {close $fd_ph}]} {
+			catch {file delete $msg_p}
 			ui_status {Commit declined by pre-commit hook.}
 			hook_failed_popup pre-commit $pch_error
 			unlock_index
 		} else {
-			commit_writetree $curHEAD $msg
+			commit_commitmsg $curHEAD $msg_p
 		}
 		set pch_error {}
 		return
@@ -238,14 +245,52 @@ proc commit_prehook_wait {fd_ph curHEAD msg} {
 	fconfigure $fd_ph -blocking 0
 }
 
-proc commit_writetree {curHEAD msg} {
+proc commit_commitmsg {curHEAD msg_p} {
+	global pch_error
+
+	# -- Run the commit-msg hook.
+	#
+	set fd_ph [githook_read commit-msg $msg_p]
+	if {$fd_ph eq {}} {
+		commit_writetree $curHEAD $msg_p
+		return
+	}
+
+	ui_status {Calling commit-msg hook...}
+	set pch_error {}
+	fconfigure $fd_ph -blocking 0 -translation binary -eofchar {}
+	fileevent $fd_ph readable \
+		[list commit_commitmsg_wait $fd_ph $curHEAD $msg_p]
+}
+
+proc commit_commitmsg_wait {fd_ph curHEAD msg_p} {
+	global pch_error
+
+	append pch_error [read $fd_ph]
+	fconfigure $fd_ph -blocking 1
+	if {[eof $fd_ph]} {
+		if {[catch {close $fd_ph}]} {
+			catch {file delete $msg_p}
+			ui_status {Commit declined by commit-msg hook.}
+			hook_failed_popup commit-msg $pch_error
+			unlock_index
+		} else {
+			commit_writetree $curHEAD $msg_p
+		}
+		set pch_error {}
+		return
+	}
+	fconfigure $fd_ph -blocking 0
+}
+
+proc commit_writetree {curHEAD msg_p} {
 	ui_status {Committing changes...}
 	set fd_wt [git_read write-tree]
 	fileevent $fd_wt readable \
-		[list commit_committree $fd_wt $curHEAD $msg]
+		[list commit_committree $fd_wt $curHEAD $msg_p]
 }
 
-proc commit_committree {fd_wt curHEAD msg} {
+proc commit_committree {fd_wt curHEAD msg_p} {
 	global HEAD PARENT MERGE_HEAD commit_type
 	global current_branch
 	global ui_comm selected_commit_type
@@ -254,6 +299,7 @@ proc commit_committree {fd_wt curHEAD msg} {
 
 	gets $fd_wt tree_id
 	if {[catch {close $fd_wt} err]} {
+		catch {file delete $msg_p}
 		error_popup [strcat [mc "write-tree failed:"] "\n\n$err"]
 		ui_status {Commit failed.}
 		unlock_index
@@ -276,6 +322,7 @@ proc commit_committree {fd_wt curHEAD msg} {
 		}
 
 		if {$tree_id eq $old_tree} {
+			catch {file delete $msg_p}
 			info_popup [mc "No changes to commit.
 
 No files were modified by this commit and it was not a merge commit.
@@ -288,24 +335,6 @@ A rescan will be automatically started now.
 		}
 	}
 
-	# -- Build the message.
-	#
-	set msg_p [gitdir COMMIT_EDITMSG]
-	set msg_wt [open $msg_p w]
-	fconfigure $msg_wt -translation lf
-	if {[catch {set enc $repo_config(i18n.commitencoding)}]} {
-		set enc utf-8
-	}
-	set use_enc [tcl_encoding $enc]
-	if {$use_enc ne {}} {
-		fconfigure $msg_wt -encoding $use_enc
-	} else {
-		puts stderr [mc "warning: Tcl does not support encoding '%s'." $enc]
-		fconfigure $msg_wt -encoding utf-8
-	}
-	puts $msg_wt $msg
-	close $msg_wt
-
 	# -- Create the commit.
 	#
 	set cmd [list commit-tree $tree_id]
@@ -314,6 +343,7 @@ A rescan will be automatically started now.
 	}
 	lappend cmd <$msg_p
 	if {[catch {set cmt_id [eval git $cmd]} err]} {
+		catch {file delete $msg_p}
 		error_popup [strcat [mc "commit-tree failed:"] "\n\n$err"]
 		ui_status {Commit failed.}
 		unlock_index
@@ -326,16 +356,14 @@ A rescan will be automatically started now.
 	if {$commit_type ne {normal}} {
 		append reflogm " ($commit_type)"
 	}
-	set i [string first "\n" $msg]
-	if {$i >= 0} {
-		set subject [string range $msg 0 [expr {$i - 1}]]
-	} else {
-		set subject $msg
-	}
+	set msg_fd [open $msg_p r]
+	gets $msg_fd subject
+	close $msg_fd
 	append reflogm {: } $subject
 	if {[catch {
 			git update-ref -m $reflogm HEAD $cmt_id $curHEAD
 		} err]} {
+		catch {file delete $msg_p}
 		error_popup [strcat [mc "update-ref failed:"] "\n\n$err"]
 		ui_status {Commit failed.}
 		unlock_index
@@ -363,17 +391,13 @@ A rescan will be automatically started now.
 
 	# -- Run the post-commit hook.
 	#
-	set pchook [gitdir hooks post-commit]
-	if {[is_Cygwin] && [file isfile $pchook]} {
-		set pchook [list sh -c [concat \
-			"if test -x \"$pchook\";" \
-			"then exec \"$pchook\";" \
-			"fi"]]
-	} elseif {![file executable $pchook]} {
-		set pchook {}
-	}
-	if {$pchook ne {}} {
-		catch {exec $pchook &}
+	set fd_ph [githook_read post-commit]
+	if {$fd_ph ne {}} {
+		upvar #0 pch_error$cmt_id pc_err
+		set pc_err {}
+		fconfigure $fd_ph -blocking 0 -translation binary -eofchar {}
+		fileevent $fd_ph readable \
+			[list commit_postcommit_wait $fd_ph $cmt_id]
 	}
 
 	$ui_comm delete 0.0 end
@@ -429,3 +453,18 @@ A rescan will be automatically started now.
 	reshow_diff
 	ui_status [mc "Created commit %s: %s" [string range $cmt_id 0 7] $subject]
 }
+
+proc commit_postcommit_wait {fd_ph cmt_id} {
+	upvar #0 pch_error$cmt_id pch_error
+
+	append pch_error [read $fd_ph]
+	fconfigure $fd_ph -blocking 1
+	if {[eof $fd_ph]} {
+		if {[catch {close $fd_ph}]} {
+			hook_failed_popup post-commit $pch_error 0
+		}
+		unset pch_error
+		return
+	}
+	fconfigure $fd_ph -blocking 0
+}
diff --git a/git-gui/lib/error.tcl b/git-gui/lib/error.tcl
index 13565b7ab0..0fdd7531da 100644
--- a/git-gui/lib/error.tcl
+++ b/git-gui/lib/error.tcl
@@ -62,7 +62,7 @@ proc ask_popup {msg} {
 	eval $cmd
 }
 
-proc hook_failed_popup {hook msg} {
+proc hook_failed_popup {hook msg {is_fatal 1}} {
 	set w .hookfail
 	toplevel $w
 
@@ -77,14 +77,16 @@ proc hook_failed_popup {hook msg} {
 		-width 80 -height 10 \
 		-font font_diff \
 		-yscrollcommand [list $w.m.sby set]
-	label $w.m.l2 \
-		-text [mc "You must correct the above errors before committing."] \
-		-anchor w \
-		-justify left \
-		-font font_uibold
 	scrollbar $w.m.sby -command [list $w.m.t yview]
 	pack $w.m.l1 -side top -fill x
-	pack $w.m.l2 -side bottom -fill x
+	if {$is_fatal} {
+		label $w.m.l2 \
+			-text [mc "You must correct the above errors before committing."] \
+			-anchor w \
+			-justify left \
+			-font font_uibold
+		pack $w.m.l2 -side bottom -fill x
+	}
 	pack $w.m.sby -side right -fill y
 	pack $w.m.t -side left -fill both -expand 1
 	pack $w.m -side top -fill both -expand 1 -padx 5 -pady 10
@@ -99,6 +101,6 @@ proc hook_failed_popup {hook msg} {
 
 	bind $w <Visibility> "grab $w; focus $w"
 	bind $w <Key-Return> "destroy $w"
-	wm title $w [append "[appname] ([reponame]): " [mc "error"]]
+	wm title $w [strcat "[appname] ([reponame]): " [mc "error"]]
 	tkwait window $w
 }
diff --git a/git-gui/po/glossary/fr.po b/git-gui/po/glossary/fr.po
index bb2feaf137..27c006abb2 100644
--- a/git-gui/po/glossary/fr.po
+++ b/git-gui/po/glossary/fr.po
@@ -34,7 +34,7 @@ msgstr "branche"
 
 #. ""
 msgid "branch [verb]"
-msgstr "créer une branche"
+msgstr "créer une branche"
 
 #. ""
 msgid "checkout [noun]"
@@ -58,7 +58,7 @@ msgstr "commiter"
 
 #. ""
 msgid "diff [noun]"
-msgstr "différence"
+msgstr "différence"
 
 #. ""
 msgid "diff [verb]"
@@ -70,11 +70,11 @@ msgstr "fusion par avance rapide"
 
 #. "Fetching a branch means to get the branch's head from a remote repository, to find out which objects are missing from the local object database, and to get them, too."
 msgid "fetch"
-msgstr "récupérer"
+msgstr "récupérer"
 
 #. "A collection of files. The index is a stored version of your working tree."
 msgid "index (in git-gui: staging area)"
-msgstr "pré-commit"
+msgstr "pré-commit"
 
 #. "A successful merge results in the creation of a new commit representing the result of the merge."
 msgid "merge [noun]"
@@ -106,15 +106,15 @@ msgstr "refaire"
 
 #. "An other repository ('remote'). One might have a set of remotes whose branches one tracks."
 msgid "remote"
-msgstr "référentiel distant"
+msgstr "référentiel distant"
 
 #. "A collection of refs (?) together with an object database containing all objects which are reachable from the refs... (oops, you've lost me here. Again, please an explanation for mere mortals?)"
 msgid "repository"
-msgstr "référentiel"
+msgstr "référentiel"
 
 #. ""
 msgid "reset"
-msgstr "réinitialiser"
+msgstr "réinitialiser"
 
 #. ""
 msgid "revert"
@@ -122,7 +122,7 @@ msgstr "inverser"
 
 #. "A particular state of files and directories which was stored in the object database."
 msgid "revision"
-msgstr "révision"
+msgstr "révision"
 
 #. ""
 msgid "sign off"
@@ -130,11 +130,11 @@ msgstr "signer"
 
 #. ""
 msgid "staging area"
-msgstr "pré-commit"
+msgstr "pré-commit"
 
 #. ""
 msgid "status"
-msgstr "état"
+msgstr "état"
 
 #. "A ref pointing to a tag or commit object"
 msgid "tag [noun]"
@@ -150,15 +150,15 @@ msgstr "branche de suivi"
 
 #. ""
 msgid "undo"
-msgstr "défaire"
+msgstr "défaire"
 
 #. ""
 msgid "update"
-msgstr "mise à jour"
+msgstr "mise à jour"
 
 #. ""
 msgid "verify"
-msgstr "vérifier"
+msgstr "vérifier"
 
 #. "The tree of actual checked out files."
 msgid "working copy, working tree"