"git am -3" first tries to apply the patch without any extra trick, and
applies it to a synthesized tree for 3-way merge after the first attempt
fails.  "git apply" exits with status 1 for a patch that is well-formed
but is not applicable (and it dies on other errors with non-zereo, non-1
status) and has an optimization to fall back to the 3-way merge only in
the case.

An earlier patch 3ddd1703 (am: suppress apply errors when using 3-way,
2009-06-16) squelched diagnostic messages from the first attempt, not to
be shown to the end user.  This worked reasonably well if the reason the
first application failed was because the patch was made against a wrong
version.

When the patch is corrupt (e.g. line-wrapped or leading whitespaces got
dropped), however, because the second patch application is not even
attempted, the error message from the first application is never shown
and is forever lost.  This message is necessary to locate where the patch
is corrupt and fix it up.

We could fix this issue by reverting 3dd170, or keeping the error message
to somewhere and showing it, but because this is an error codepath, the
easiest is to disable the optimization.  The second patch application is
attempted even when the input is corrupt, and it will notice, diagnose,
and stop with an error message.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Luckily, all the support already happens to be there.
Signed-off-by: NThomas Rast <trast@student.ethz.ch>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

We have to deal with two separate code paths: a normal rebase, which
actually goes through git-am; and rebase {-m|-s}.

The only small issue with both is that they need to remember the
original sha1 across a possible conflict resolution.  rebase -m
already puts this information in $dotest/current, and we just
introduce a similar file for git-am.

Note that in git-am, the hook really only runs when coming from
git-rebase: the code path that sets the $dotest/original-commit file
is guarded by a test for $dotest/rebasing.
Signed-off-by: NThomas Rast <trast@student.ethz.ch>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

This patch adds the configuration `am.keepcr` for git-am. It also adds
`--no-keep-cr` parameter for git-am to give the possibility to
override configuration from command line.
Signed-off-by: NStefan-W. Hahn <stefan.hahn@s-hahn.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

c2ca1d79 (Allow mailsplit (and hence git-am) to handle mails with CRLF
line-endings, 2009-08-04) fixed "git mailsplit" to help people with
MUA whose output from save-as command uses CRLF as line terminators by
stripping CR at the end of lines.

However, when you know you are feeding output from "git format-patch"
directly to "git am", and especially when your contents have CR at the
end of line, such stripping is undesirable.  To help such a use case,
teach --keep-cr option to "git am" and pass that to "git mailinfo".
Signed-off-by: NStefan-W. Hahn <stefan.hahn@s-hahn.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

When git am does an automatic gc it doesn't clean up the rebase-apply
directory until after this has finished.  This means that if the user
aborts the gc then future am or rebase operations will report that an
existing operation is in progress, which is undesirable and confusing.

Reported by Mark Brown <broonie@debian.org> through
http://bugs.debian.org/570966Signed-off-by: NJonathan Nieder <jrnieder@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

The pagination functionality in git am has some problems:

 - It does not check if stdout is a tty, so it always paginates.

 - If $GIT_PAGER uses any environment variables, they are being
   ignored, since it does not run $GIT_PAGER through eval.

 - If $GIT_PAGER is set to the empty string, instead of passing
   output through to stdout, it tries to run $dotest/patch.

Fix them.  While at it, move the definition of git_pager() to
git-sh-setup so authors of other commands are not tempted to
reimplement it with the same mistakes.
Signed-off-by: NJonathan Nieder <jrnieder@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Rebase calls this same function "--continue", which means
users may be trained to type it. There is no reason to
deprecate --resolved (or -r), so we will keep it as a
synonym.
Signed-off-by: NJeff King <peff@peff.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

The patch detection wants to inspect all the headers of a rfc2822 message
and ensure that they look like header fields. The headers are always
separated from the message body with a blank line. When Thunderbird saves
the message the blank line separating the headers from the body includes a
CR. The patch detection is failing because a CRLF doesn't match /^$/. Fix
this by allowing a CR to exist on the separating line.
Signed-off-by: NStephen Boyd <bebarino@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Introduce a command line option to override rerere.autoupdate configuration
variable to make it more useful.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Ever since the initial implementation, "git am" had kept a dead code that
never triggered due to a typo in the variable name.  Worse yet, the code,
if it weren't for the typo, would have attempted to add "[PATCH] " at the
beginning of the Subject: header when "git am" is run with its "-k"
option.  However, because "git am -k" tells mailinfo to keep such prefix
when parsing the input, the "[PATCH] " added by this dead code would have
really been unnecessary duplicate.

Embarrassing is that we kept _maintaining_ the codepath without anybody
noticing for four years.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

If the user has exported the GREP_OPTIONS environment variable, the output
from "grep" and "egrep" in scripted Porcelains may be different from what
they expect.  For example, we may want to count number of matching lines,
by "grep" piped to "wc -l", and GREP_OPTIONS=-C3 will break such use.

The approach taken by this change to address this issue is to protect only
our own use of grep/egrep.  Because we do not unset it at the beginning of
our scripts, hook scripts run from the scripted Porcelains are exposed to
the same insanity this environment variable causes when grep/egrep is used
to implement logic (e.g. "grep | wc -l"), and it is entirely up to the
hook scripts to protect themselves.

On the other hand, applypatch-msg hook may want to show offending words in
the proposed commit log message using grep to the end user, and the user
might want to set GREP_OPTIONS=--color to paint the match more visibly.
The approach to protect only our own use without unsetting the environment
variable globally will allow this use case.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

When we are rebasing we know that the header lines in the
patch are good and that we don't need to pick up any headers
from the body of the patch.

This makes it possible to rebase commits whose commit message
start with "From" or "Date".

Test vectors by Jeff King.
Signed-off-by: NLukas Sandström <luksan@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Use the new "git var GIT_PAGER" command to ask what pager to use.

Without this change, the core.pager configuration is ignored by
these commands.
Signed-off-by: NJonathan Nieder <jrnieder@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

According to egrep(1) the US-ASCII table is used when LC_ALL=C is set.
We do not rely here on the LC_ALL value we get from the environment.
Signed-off-by: NChristian Himpel <chressie@gmail.com>
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

RFC2822 specifies in paragraph 3.6.8, that optional header fields are
made up of any printable US-ASCII character except ' ' (space) and ':'
(colon).

The pattern for the egrep command is changed to match all of these
characters.
Signed-off-by: NChristian Himpel <chressie@gmail.com>
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

You can enable it by giving --scissors to "git am".
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Avoid git ending with this message:
	"Patch format  is not supported."

With improved error message in the format detection failure case by
Giuseppe Bilotta.
Signed-off-by: NNicolas Sebrecht <ni.s@laposte.net>
Signed-off-by: NBrandon Casey <drafnel@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

We traditionally allowed a mbox file or a directory name of a maildir (but
never an individual file inside a maildir) to be given to "git am".  Even
though an individual file in a maildir (or more generally, a piece of
RFC2822 e-mail) is not a mbox file, it contains enough information to
create a commit out of it, so there is no reason to reject one.  Running
mailsplit on such a file feels stupid, but it does not hurt.

This builds on top of a5a6755a (git-am foreign patch support: introduce
patch_format, 2009-05-27) that introduced mailbox format detection.  The
codepath to deal with a mbox requires it to begin with "From " line and
also allows it to begin with "From: ", but a random piece of e-mail can
and often do begin with any valid RFC2822 header lines.

Instead of checking the first line, we extract all the lines up to the
first empty line, and make sure they look like e-mail headers.

A test is added to t4150 to demonstrate this feature.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>
Signed-off-by: NBrandon Casey <drafnel@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Avoid git ending with this message:
	"Patch format  is not supported."

With improved error message in the format detection failure case by
Giuseppe Bilotta.
Signed-off-by: NNicolas Sebrecht <ni.s@laposte.net>
Signed-off-by: NBrandon Casey <drafnel@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

We traditionally allowed a mbox file or a directory name of a maildir (but
never an individual file inside a maildir) to be given to "git am".  Even
though an individual file in a maildir (or more generally, a piece of
RFC2822 e-mail) is not a mbox file, it contains enough information to
create a commit out of it, so there is no reason to reject one.  Running
mailsplit on such a file feels stupid, but it does not hurt.

This builds on top of a5a6755a (git-am foreign patch support: introduce
patch_format, 2009-05-27) that introduced mailbox format detection.  The
codepath to deal with a mbox requires it to begin with "From " line and
also allows it to begin with "From: ", but a random piece of e-mail can
and often do begin with any valid RFC2822 header lines.

Instead of checking the first line, we extract all the lines up to the
first empty line, and make sure they look like e-mail headers.

A test is added to t4150 to demonstrate this feature.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>
Signed-off-by: NBrandon Casey <drafnel@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

It is not that uncommon to have mails with DOS line-ending, notably
Thunderbird and web mailers like Gmail (when saving what they call
"original" message).  So modify mailsplit to convert CRLF line-endings to
just LF.

Since git-rebase is built on top of git-am, add an option to mailsplit to
be used by git-am when it is acting on behalf of git-rebase, to refrain
from doing this conversion.

And add a test to make sure that rebase still works.
Signed-off-by: NBrandon Casey <drafnel@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Introduce --ignore-whitespace option and corresponding config bool to
ignore whitespace differences while applying patches, akin to the
'patch' program.

'git am', 'git rebase' and the bash git completion are made aware of
this option.
Signed-off-by: NGiuseppe Bilotta <giuseppe.bilotta@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

git-am and git-rebase are talkative scripts. Teach them to be quiet when
told, allowing them to speak only when they fail or experience errors.

The quiet option is maintained when git-am or git-rebase fails to apply
a patch. This means subsequent --resolved, --continue, --skip, --abort
invocations will be quiet if the original invocation was quiet.

Drop a handful of >&2 redirection; the rest of the program sends all the
info messages to stdout, not to stderr.
Signed-off-by: NStephen Boyd <bebarino@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

git-am with 3-way outputs errors when applying, even though the
3-way will usually be successful. We suppress these errors from
git-apply because they are not "true" errors until the 3-way has been
attempted.
Signed-off-by: NStephen Boyd <bebarino@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Introduce a clean_abort function that echoes an optional error message
to standard error, removes the dotest directory and exits with status 1.

Use it when patch format detection or patch splitting fails early.
Signed-off-by: NGiuseppe Bilotta <giuseppe.bilotta@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Support StGIT patches by implementing a simple perl-based converter
mimicking StGIT's own parse_patch. Also support StGIT patch series by
'exploding' the index into a list of files and re-running the mail
splitting with patch_format set to stgit.
Signed-off-by: NGiuseppe Bilotta <giuseppe.bilotta@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Default to mbox format if input is from stdin. Otherwise, look at the
first few lines of the first patch to try to guess its format.

Include checks for mailboxes, stgit patch series, stgit single patches
and hg patches.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Set up a framework to allow git-am to support patches which are not in
mailbox format. Introduce a patch_format variable that presently can
only be set from the command line, defaulting to 'mbox' (the only
supported format) if not specified.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Signed-off-by: NChristian Couder <chriscool@tuxfamily.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Ash (used as /bin/sh on many distros) has a shell expansion bug
for the form ${var:+word word}.  The result is a single argument
"word word".  Work around by using ${var:+word} ${var:+word} or
equivalent.
Signed-off-by: NBen Jackson <ben@ben.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

People sometimes wonder why they cannot apply a patch that only
creates new files to an unborn branch.
Signed-off-by: NNanako Shiraishi <nanako3@lavabit.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

When you are in the middle of "git rebase", "git am --abort" by mistake
would have referred to nonexistent ORIG_HEAD and barfed, or worse yet, used
a stale ORIG_HEAD and taken you to an unexpected commit.

Also the option parsing did not reject "git am --abort --skip".
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

git am --abort resets the index unconditionally. But in case a previous
git am exited due to a dirty index it is preferable to keep that index.
Make it so.
Signed-off-by: NMichael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Update usage statement to remove a no-longer supported option, and to hide two
options (one a no-op, one internal) unless --help-all is used.

Use "test -t 0" instead of "tty -s" to detect when stdin is a terminal. (test
-t 0 is used elsewhere in git-am and in other git shell scripts, tty -s is
not, and appears to be deprecated by POSIX)

Use "test ..." instead of "[ ... ]" and "die <msg>" instead of "echo <msg>
>&2; exit 1" to be consistent with rest of script.
Signed-off-by: NJay Soffian <jaysoffian@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

This new option tells 'git-am' to ignore the date header field
recorded in the format-patch output. The commits will have the
timestamp when they are created instead.

You can work a lot in one day to accumulate many changes, but
apply and push to the public repository only some of them at
the end of the first day. Then next day you can spend all your
working hours reading comics or chatting with your coworkers,
and apply your remaining patches from the previous day using
this option to pretend that you have been working at the end
of the day.
Signed-off-by: Nしらいしななこ <nanako3@lavabit.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

This new option tells 'git-am' to use the timestamp recorded
in the Email message as both author and committer date.
Signed-off-by: Nしらいしななこ <nanako3@lavabit.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

With --reject, git-am simply passes the --reject option to git-apply and thus
allows people to work with reject files if they so prefer.
Signed-off-by: Nmartin f. krafft <madduck@madduck.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

The $FIRSTLINE variable is from the user's commit and can contain
arbitrary backslash escapes that may be (mis)interpreted when given to
"echo", depending on the implementation.  Use "printf" to work around the
issue.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

When git-am fails it's not always easy to see which patch failed,
since it's often hidden by a lot of error messages.
Add an extra line which prints the name of the failed patch just
before the resolve message to make it easier to find.
Signed-off-by: NJonas Flodén <jonas@floden.nu>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>