From 8d8140843501107c92e2f9a5acb60ee136352c1f Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Tue, 25 Nov 2014 15:00:27 +0100 Subject: [PATCH] git-send-email: add --transfer-encoding option The thread at http://thread.gmane.org/gmane.comp.version-control.git/257392 details problems when applying patches with "git am" in a repository with CRLF line endings. In the example in the thread, the repository originated from "git-svn" so it is not possible to use core.eol and friends on it. Right now, the best option is to use "git am --keep-cr". However, when a patch create new files, the patch application process will reject the new file because it finds a "/dev/null\r" string instead of "/dev/null". The problem is that SMTP transport is CRLF-unsafe. Sending a patch by email is the same as passing it through "dos2unix | unix2dos". The newly introduced CRLFs are normally transparent because git-am strips them. The keepcr=true setting preserves them, but it is mostly working by chance and it would be very problematic to have a "git am" workflow in a repository with mixed LF and CRLF line endings. The MIME solution to this is the quoted-printable transfer enconding. This is not something that we want to enable by default, since it makes received emails horrible to look at. However, it is a very good match for projects that store CRLF line endings in the repository. The only disadvantage of quoted-printable is that quoted-printable patches fail to apply if the maintainer uses "git am --keep-cr". This is because the decoded patch will have two carriage returns at the end of the line. Therefore, add support for base64 transfer encoding too, which makes received emails downright impossible to look at outside a MUA, but really just works. The patch covers all bases, including users that still live in the late 80s, by also providing a 7bit content transfer encoding that refuses to send emails with non-ASCII character in them. And finally, "8bit" will add a Content-Transfer-Encoding header but otherwise do nothing. Signed-off-by: Paolo Bonzini Signed-off-by: Junio C Hamano --- Documentation/config.txt | 1 + Documentation/git-send-email.txt | 10 +++ contrib/completion/git-completion.bash | 4 + git-send-email.perl | 36 ++++++++ t/t9001-send-email.sh | 157 +++++++++++++++++++++++++++++++++ 5 files changed, 208 insertions(+) diff --git a/Documentation/config.txt b/Documentation/config.txt index 922072596f..cc2ff201be 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -2303,6 +2303,7 @@ sendemail.smtpserverport:: sendemail.smtpserveroption:: sendemail.smtpuser:: sendemail.thread:: +sendemail.transferencoding:: sendemail.validate:: See linkgit:git-send-email[1] for description. diff --git a/Documentation/git-send-email.txt b/Documentation/git-send-email.txt index a60776eb57..a9efa5c2ec 100644 --- a/Documentation/git-send-email.txt +++ b/Documentation/git-send-email.txt @@ -131,6 +131,16 @@ Note that no attempts whatsoever are made to validate the encoding. Specify encoding of compose message. Default is the value of the 'sendemail.composeencoding'; if that is unspecified, UTF-8 is assumed. +--transfer-encoding=(7bit|8bit|quoted-printable|base64):: + Specify the transfer encoding to be used to send the message over SMTP. + 7bit will fail upon encountering a non-ASCII message. quoted-printable + can be useful when the repository contains files that contain carriage + returns, but makes the raw patch email file (as saved from a MUA) much + harder to inspect manually. base64 is even more fool proof, but also + even more opaque. Default is the value of the 'sendemail.transferEncoding' + configuration value; if that is unspecified, git will use 8bit and not + add a Content-Transfer-Encoding header. + Sending ~~~~~~~ diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash index 2fece98c60..b154f7066b 100644 --- a/contrib/completion/git-completion.bash +++ b/contrib/completion/git-completion.bash @@ -1875,6 +1875,10 @@ _git_config () __gitcomp "$__git_send_email_suppresscc_options" return ;; + sendemail.transferencoding) + __gitcomp "7bit 8bit quoted-printable base64" + return + ;; --get|--get-all|--unset|--unset-all) __gitcomp_nl "$(__git_config_get_set_variables)" return diff --git a/git-send-email.perl b/git-send-email.perl index b29a3045b7..82c6feaa46 100755 --- a/git-send-email.perl +++ b/git-send-email.perl @@ -58,6 +58,7 @@ git send-email [options] --compose * Open an editor for introduction. --compose-encoding * Encoding to assume for introduction. --8bit-encoding * Encoding to assume 8bit mails if undeclared + --transfer-encoding * Transfer encoding to use (quoted-printable, 8bit, base64) Sending: --envelope-sender * Email envelope sender. @@ -206,6 +207,7 @@ my ($validate, $confirm); my (@suppress_cc); my ($auto_8bit_encoding); my ($compose_encoding); +my ($target_xfer_encoding); my ($debug_net_smtp) = 0; # Net::SMTP, see send_message() @@ -242,6 +244,7 @@ my %config_settings = ( "from" => \$sender, "assume8bitencoding" => \$auto_8bit_encoding, "composeencoding" => \$compose_encoding, + "transferencoding" => \$target_xfer_encoding, ); my %config_path_settings = ( @@ -314,6 +317,7 @@ my $rc = GetOptions("h" => \$help, "envelope-sender=s" => \$envelope_sender, "thread!" => \$thread, "validate!" => \$validate, + "transfer-encoding=s" => \$target_xfer_encoding, "format-patch!" => \$format_patch, "8bit-encoding=s" => \$auto_8bit_encoding, "compose-encoding=s" => \$compose_encoding, @@ -1482,6 +1486,12 @@ foreach my $t (@files) { } } } + if (defined $target_xfer_encoding) { + $xfer_encoding = '8bit' if not defined $xfer_encoding; + $message = apply_transfer_encoding( + $message, $xfer_encoding, $target_xfer_encoding); + $xfer_encoding = $target_xfer_encoding; + } if (defined $xfer_encoding) { push @xh, "Content-Transfer-Encoding: $xfer_encoding"; } @@ -1556,6 +1566,32 @@ sub cleanup_compose_files { $smtp->quit if $smtp; +sub apply_transfer_encoding { + my $message = shift; + my $from = shift; + my $to = shift; + + return $message if ($from eq $to and $from ne '7bit'); + + require MIME::QuotedPrint; + require MIME::Base64; + + $message = MIME::QuotedPrint::decode($message) + if ($from eq 'quoted-printable'); + $message = MIME::Base64::decode($message) + if ($from eq 'base64'); + + die "cannot send message as 7bit" + if ($to eq '7bit' and $message =~ /[^[:ascii:]]/); + return $message + if ($to eq '7bit' or $to eq '8bit'); + return MIME::QuotedPrint::encode($message, "\n", 0) + if ($to eq 'quoted-printable'); + return MIME::Base64::encode($message, "\n") + if ($to eq 'base64'); + die "invalid transfer encoding"; +} + sub unique_email_list { my %seen; my @emails; diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh index 19a3ced600..e5016f4573 100755 --- a/t/t9001-send-email.sh +++ b/t/t9001-send-email.sh @@ -1298,6 +1298,163 @@ test_expect_success $PREREQ '--8bit-encoding also treats subject' ' test_cmp expected actual ' +test_expect_success $PREREQ 'setup expect' ' +cat >email-using-8bit < +From: A U Thor +Date: Sat, 12 Jun 2010 15:53:58 +0200 +Content-Type: text/plain; charset=UTF-8 +Subject: Nothing to see here. + +Dieser Betreff enthält auch einen Umlaut! +EOF +' + +test_expect_success $PREREQ 'sendemail.transferencoding=7bit fails on 8bit data' ' + clean_fake_sendmail && + git config sendemail.transferEncoding 7bit && + test_must_fail git send-email \ + --transfer-encoding=7bit \ + --smtp-server="$(pwd)/fake.sendmail" \ + email-using-8bit \ + 2>errors >out && + grep "cannot send message as 7bit" errors && + test -z "$(ls msgtxt*)" +' + +test_expect_success $PREREQ '--transfer-encoding overrides sendemail.transferEncoding' ' + clean_fake_sendmail && + git config sendemail.transferEncoding 8bit + test_must_fail git send-email \ + --transfer-encoding=7bit \ + --smtp-server="$(pwd)/fake.sendmail" \ + email-using-8bit \ + 2>errors >out && + grep "cannot send message as 7bit" errors && + test -z "$(ls msgtxt*)" +' + +test_expect_success $PREREQ 'sendemail.transferencoding=8bit' ' + clean_fake_sendmail && + git send-email \ + --transfer-encoding=8bit \ + --smtp-server="$(pwd)/fake.sendmail" \ + email-using-8bit \ + 2>errors >out && + sed '1,/^$/d' msgtxt1 >actual && + sed '1,/^$/d' email-using-8bit >expected && + test_cmp expected actual +' + +test_expect_success $PREREQ 'setup expect' ' +cat >expected <errors >out && + sed '1,/^$/d' msgtxt1 >actual && + test_cmp expected actual +' + +test_expect_success $PREREQ 'setup expect' ' +cat >expected <errors >out && + sed '1,/^$/d' msgtxt1 >actual && + test_cmp expected actual +' + +test_expect_success $PREREQ 'setup expect' ' +cat >email-using-qp < +From: A U Thor +Date: Sat, 12 Jun 2010 15:53:58 +0200 +MIME-Version: 1.0 +Content-Transfer-Encoding: quoted-printable +Content-Type: text/plain; charset=UTF-8 +Subject: Nothing to see here. + +Dieser Betreff enth=C3=A4lt auch einen Umlaut! +EOF +' + +test_expect_success $PREREQ 'convert from quoted-printable to base64' ' + clean_fake_sendmail && + git send-email \ + --transfer-encoding=base64 \ + --smtp-server="$(pwd)/fake.sendmail" \ + email-using-qp \ + 2>errors >out && + sed '1,/^$/d' msgtxt1 >actual && + test_cmp expected actual +' + +test_expect_success $PREREQ 'setup expect' " +tr -d '\\015' | tr '%' '\\015' > email-using-crlf < +From: A U Thor +Date: Sat, 12 Jun 2010 15:53:58 +0200 +Content-Type: text/plain; charset=UTF-8 +Subject: Nothing to see here. + +Look, I have a CRLF and an = sign!% +EOF +" + +test_expect_success $PREREQ 'setup expect' ' +cat >expected <errors >out && + sed '1,/^$/d' msgtxt1 >actual && + test_cmp expected actual +' + +test_expect_success $PREREQ 'setup expect' ' +cat >expected <errors >out && + sed '1,/^$/d' msgtxt1 >actual && + test_cmp expected actual +' + + # Note that the patches in this test are deliberately out of order; we # want to make sure it works even if the cover-letter is not in the # first mail. -- 2.11.4.GIT