chore(3p/git): Unvendor git and track patches instead r/2903

This was vendored a long time ago under the expectation that keeping
it in sync with cgit would be easier this way, but it has proven not
to be a big issue.

On the other hand, a vendored copy of git is an annoying maintenance
burden. It is much easier to rebase the single (dottime) patch that we
have.

This removes the vendored copy of git and instead passes the git
source code to cgit via `pkgs.srcOnly`, which includes the applied
patch so that cgit can continue rendering dottime.

Change-Id: If31f62dea7ce688fd1b9050204e9378019775f2b

1 files changed, 119 insertions, 0 deletions

diff --git a/third_party/git/0001-feat-third_party-git-date-add-dottime-format.patch b/third_party/git/0001-feat-third_party-git-date-add-dottime-format.patch
new file mode 100644
index 000000000000..0e11b2ca63d0
--- /dev/null
+++ b/third_party/git/0001-feat-third_party-git-date-add-dottime-format.patch
@@ -0,0 +1,119 @@
+From 46c52e6b462f9b1c9aa08a1b1bba79dd16302a9c Mon Sep 17 00:00:00 2001
+From: Vincent Ambo <tazjin@google.com>
+Date: Mon, 6 Jan 2020 16:00:52 +0000
+Subject: [PATCH] feat(third_party/git/date): add "dottime" format
+
+Adds dottime (as defined on https://dotti.me) as a timestamp format.
+
+This format is designed to simplify working with timestamps across
+many different timezones by keeping the timestamp format itself in
+UTC (and indicating this with a dot character), but appending the
+local offset.
+
+This is implemented as a new format because the timestamp needs to be
+rendered both as UTC and including the offset, an implementation using
+a strftime formatting string is not sufficient.
+---
+ Documentation/rev-list-options.txt |  3 +++
+ builtin/blame.c                    |  3 +++
+ cache.h                            |  3 ++-
+ date.c                             | 17 +++++++++++++++++
+ t/t0006-date.sh                    |  2 ++
+ 5 files changed, 27 insertions(+), 1 deletion(-)
+
+diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
+index b7bd27e171..273971bdd0 100644
+--- a/Documentation/rev-list-options.txt
++++ b/Documentation/rev-list-options.txt
+@@ -1052,6 +1052,9 @@ omitted.
+ 1970).  As with `--raw`, this is always in UTC and therefore `-local`
+ has no effect.
+ 
++`--date=dottime` shows the date in dottime format (rendered as UTC,
++but suffixed with the local timezone offset if given)
++
+ `--date=format:...` feeds the format `...` to your system `strftime`,
+ except for %z and %Z, which are handled internally.
+ Use `--date=format:%c` to show the date in your system locale's
+diff --git a/builtin/blame.c b/builtin/blame.c
+index 641523ff9a..fa0240237c 100644
+--- a/builtin/blame.c
++++ b/builtin/blame.c
+@@ -1005,6 +1005,9 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
+ 	case DATE_STRFTIME:
+ 		blame_date_width = strlen(show_date(0, 0, &blame_date_mode)) + 1; /* add the null */
+ 		break;
++	case DATE_DOTTIME:
++		blame_date_width = sizeof("2006-10-19T15·00-0700");
++		break;
+ 	}
+ 	blame_date_width -= 1; /* strip the null */
+ 
+diff --git a/cache.h b/cache.h
+index 0c245d4f10..fa79e37b49 100644
+--- a/cache.h
++++ b/cache.h
+@@ -1570,7 +1570,8 @@ enum date_mode_type {
+ 	DATE_RFC2822,
+ 	DATE_STRFTIME,
+ 	DATE_RAW,
+-	DATE_UNIX
++	DATE_UNIX,
++	DATE_DOTTIME
+ };
+ 
+ struct date_mode {
+diff --git a/date.c b/date.c
+index c55ea47e96..7fe4fb982b 100644
+--- a/date.c
++++ b/date.c
+@@ -347,6 +347,21 @@ const char *show_date(timestamp_t time, int tz, const struct date_mode *mode)
+ 				tm->tm_mday,
+ 				tm->tm_hour, tm->tm_min, tm->tm_sec,
+ 				sign, tz / 100, tz % 100);
++	} else if (mode->type == DATE_DOTTIME) {
++		char sign = (tz >= 0) ? '+' : '-';
++		tz = abs(tz);
++
++		// Time is converted again without the timezone as the
++		// dottime format includes the zone only in offset
++		// position.
++		time_t t = gm_time_t(time, 0);
++		gmtime_r(&t, tm);
++		strbuf_addf(&timebuf, "%04d-%02d-%02dT%02d·%02d%c%02d%02d",
++				tm->tm_year + 1900,
++				tm->tm_mon + 1,
++				tm->tm_mday,
++				tm->tm_hour, tm->tm_min,
++				sign, tz / 100, tz % 100);
+ 	} else if (mode->type == DATE_RFC2822)
+ 		strbuf_addf(&timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
+ 			weekday_names[tm->tm_wday], tm->tm_mday,
+@@ -955,6 +970,8 @@ static enum date_mode_type parse_date_type(const char *format, const char **end)
+ 		return DATE_UNIX;
+ 	if (skip_prefix(format, "format", end))
+ 		return DATE_STRFTIME;
++	if (skip_prefix(format, "dottime", end))
++		return DATE_DOTTIME;
+ 	/*
+ 	 * Please update $__git_log_date_formats in
+ 	 * git-completion.bash when you add new formats.
+diff --git a/t/t0006-date.sh b/t/t0006-date.sh
+index 6b757d7169..5deb558497 100755
+--- a/t/t0006-date.sh
++++ b/t/t0006-date.sh
+@@ -49,9 +49,11 @@ check_show short "$TIME" '2016-06-15'
+ check_show default "$TIME" 'Wed Jun 15 16:13:20 2016 +0200'
+ check_show raw "$TIME" '1466000000 +0200'
+ check_show unix "$TIME" '1466000000'
++check_show dottime "$TIME" '2016-06-15T14·13+0200'
+ check_show iso-local "$TIME" '2016-06-15 14:13:20 +0000'
+ check_show raw-local "$TIME" '1466000000 +0000'
+ check_show unix-local "$TIME" '1466000000'
++check_show dottime-local "$TIME" '2016-06-15T14·13+0000'
+ 
+ check_show 'format:%z' "$TIME" '+0200'
+ check_show 'format-local:%z' "$TIME" '+0000'
+-- 
+2.32.0
+