From: suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
To: git@vger.kernel.org
Cc: suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
Subject: [PATCH] git-archive: accept --owner and --group like GNU tar
Date: Fri, 29 Dec 2017 23:05:35 +0900 [thread overview]
Message-ID: <20171229140535.10746-1-mpsuzuki@hiroshima-u.ac.jp> (raw)
The ownership of files created by git-archive is always
root:root. Add --owner and --group options which work
like the GNU tar equivalent to allow overriding these
defaults.
Signed-off-by: suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
---
Documentation/git-archive.txt | 13 +++
archive-tar.c | 8 +-
archive.c | 224 ++++++++++++++++++++++++++++++++++++++++++
archive.h | 4 +
t/t5005-archive-uid-gid.sh | 140 ++++++++++++++++++++++++++
t/t5005/parse-tar-file.py | 60 +++++++++++
tar.h | 2 +
7 files changed, 447 insertions(+), 4 deletions(-)
create mode 100755 t/t5005-archive-uid-gid.sh
create mode 100755 t/t5005/parse-tar-file.py
diff --git a/Documentation/git-archive.txt b/Documentation/git-archive.txt
index cfa1e4ebe..0d156f6c1 100644
--- a/Documentation/git-archive.txt
+++ b/Documentation/git-archive.txt
@@ -11,6 +11,7 @@ SYNOPSIS
[verse]
'git archive' [--format=<fmt>] [--list] [--prefix=<prefix>/] [<extra>]
[-o <file> | --output=<file>] [--worktree-attributes]
+ [--owner [username[:uid]] [--group [groupname[:gid]]
[--remote=<repo> [--exec=<git-upload-archive>]] <tree-ish>
[<path>...]
@@ -63,6 +64,18 @@ OPTIONS
This can be any options that the archiver backend understands.
See next section.
+--owner=<name>[:<uid>]::
+ Force <name> as owner and <uid> as uid for the files in the tar
+ archive. If <uid> is not supplied, <name> can be either a user
+ name or numeric UID. In this case the missing part (UID or
+ name) will be inferred from the current host's user database.
+
+--group=<name>[:<gid>]::
+ Force <name> as group and <gid> as gid for the files in the tar
+ archive. If <gid> is not supplied, <name> can be either a group
+ name or numeric GID. In this case the missing part (GID or
+ name) will be inferred from the current host's group database.
+
--remote=<repo>::
Instead of making a tar archive from the local repository,
retrieve a tar archive from a remote repository. Note that the
diff --git a/archive-tar.c b/archive-tar.c
index c6ed96ee7..ca6471870 100644
--- a/archive-tar.c
+++ b/archive-tar.c
@@ -204,10 +204,10 @@ static void prepare_header(struct archiver_args *args,
xsnprintf(header->size, sizeof(header->size), "%011lo", S_ISREG(mode) ? size : 0);
xsnprintf(header->mtime, sizeof(header->mtime), "%011lo", (unsigned long) args->time);
- xsnprintf(header->uid, sizeof(header->uid), "%07o", 0);
- xsnprintf(header->gid, sizeof(header->gid), "%07o", 0);
- strlcpy(header->uname, "root", sizeof(header->uname));
- strlcpy(header->gname, "root", sizeof(header->gname));
+ xsnprintf(header->uid, sizeof(header->uid), "%07lo", args->uid);
+ xsnprintf(header->gid, sizeof(header->gid), "%07lo", args->gid);
+ strlcpy(header->uname, args->uname, sizeof(header->uname));
+ strlcpy(header->gname, args->gname, sizeof(header->gname));
xsnprintf(header->devmajor, sizeof(header->devmajor), "%07o", 0);
xsnprintf(header->devminor, sizeof(header->devminor), "%07o", 0);
diff --git a/archive.c b/archive.c
index 0b7b62af0..aa4b16b75 100644
--- a/archive.c
+++ b/archive.c
@@ -8,6 +8,7 @@
#include "parse-options.h"
#include "unpack-trees.h"
#include "dir.h"
+#include "tar.h"
static char const * const archive_usage[] = {
N_("git archive [<options>] <tree-ish> [<path>...]"),
@@ -417,6 +418,223 @@ static void parse_treeish_arg(const char **argv,
{ OPTION_SET_INT, (s), NULL, (v), NULL, "", \
PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
+/*
+ * GNU tar --owner, --group options reject hexdigit, signed int values.
+ * strtol(), atoi() are too permissive to simulate the behaviour.
+ */
+#define STR_IS_DIGIT_OK 0
+#define STR_IS_NOT_DIGIT -1
+#define STR_IS_DIGIT_TOO_LARGE -2
+
+static int try_as_simple_digit(const char *s, unsigned long *dst)
+{
+ unsigned long ul;
+ char *endptr;
+
+ if (strlen(s) != strspn(s, "0123456789"))
+ return STR_IS_NOT_DIGIT;
+
+ errno = 0;
+ ul = strtoul(s, &endptr, 10);
+
+ /* catch ERANGE */
+ if (errno) {
+ errno = 0;
+ return STR_IS_DIGIT_TOO_LARGE;
+ }
+
+#if ULONG_MAX > 0xFFFFFFFFUL
+ /*
+ * --owner, --group rejects uid/gid greater than 32-bit
+ * limits, even on 64-bit platforms.
+ */
+ if (ul > 0xFFFFFFFFUL)
+ return STR_IS_DIGIT_TOO_LARGE;
+#endif
+
+ if (dst)
+ *dst = ul;
+ return STR_IS_DIGIT_OK;
+}
+
+static const char *skip_leading_colon(const char *s)
+{
+ const char *col_pos;
+
+ col_pos = strchr(s, ':');
+ if (!col_pos)
+ return s;
+
+ return (col_pos + 1);
+}
+
+#define STR_IS_NAME_COLON_DIGIT 0
+#define STR_HAS_NO_COLON -1
+#define STR_HAS_DIGIT_BROKEN -2
+#define STR_HAS_DIGIT_TOO_LARGE -3
+
+static int try_as_name_colon_digit(const char *s, const char **dst_s,
+ unsigned long *dst_ul)
+{
+ int r;
+ const char *s2;
+
+ s2 = skip_leading_colon(s);
+ if (s2 == s)
+ return STR_HAS_NO_COLON;
+
+ r = try_as_simple_digit(s2, dst_ul);
+ switch (r) {
+ case STR_IS_DIGIT_OK:
+ *dst_s = xstrndup(s, s2 - s - 1);
+ return STR_IS_NAME_COLON_DIGIT;
+ case STR_IS_DIGIT_TOO_LARGE:
+ return STR_HAS_DIGIT_TOO_LARGE;
+ default:
+ return STR_HAS_DIGIT_BROKEN;
+ }
+}
+
+#define NAME_ID_BOTH_GIVEN 0
+#define NAME_ID_ID_GUESSED 1
+#define NAME_ID_ID_UNTOUCHED 2
+#define NAME_ID_NAME_GUESSED 3
+#define NAME_ID_NAME_EMPTY 4
+#define NAME_ID_ERR_ID_TOO_LARGE -126
+#define NAME_ID_ERR_SYNTAX -127
+#define NAME_ID_ERR_PARAMS -128
+
+static int set_args_uname_uid(struct archiver_args *args,
+ const char *tar_owner)
+{
+ int r;
+ struct passwd *pw = NULL;
+
+ if (!args || !tar_owner)
+ return NAME_ID_ERR_PARAMS;
+
+ r = try_as_name_colon_digit(tar_owner, &(args->uname),
+ &(args->uid));
+ switch (r) {
+ case STR_IS_NAME_COLON_DIGIT:
+ return NAME_ID_BOTH_GIVEN;
+ case STR_HAS_DIGIT_TOO_LARGE:
+ return NAME_ID_ERR_ID_TOO_LARGE;
+ case STR_HAS_DIGIT_BROKEN:
+ return NAME_ID_ERR_SYNTAX;
+ }
+
+ /* the operand is known to be single token */
+
+ r = try_as_simple_digit(tar_owner, &(args->uid));
+ switch (r) {
+ case STR_IS_DIGIT_TOO_LARGE:
+ return NAME_ID_ERR_ID_TOO_LARGE;
+ case STR_IS_DIGIT_OK:
+ pw = getpwuid(args->uid);
+ if (!pw) {
+ args->uname = xstrdup("");
+ return NAME_ID_NAME_EMPTY;
+ }
+ args->uname = xstrdup(pw->pw_name);
+ return NAME_ID_NAME_GUESSED;
+ }
+
+ /* the operand is known to be non-digit */
+
+ args->uname = xstrdup(tar_owner);
+ pw = getpwnam(tar_owner);
+ if (!pw)
+ return NAME_ID_ID_UNTOUCHED;
+ args->uid = pw->pw_uid;
+ return NAME_ID_ID_GUESSED;
+}
+
+static int set_args_gname_gid(struct archiver_args *args,
+ const char *tar_group)
+{
+ int r;
+ struct group *gr = NULL;
+
+ if (!args || !tar_group)
+ return NAME_ID_ERR_PARAMS;
+
+ r = try_as_name_colon_digit(tar_group, &(args->gname),
+ &(args->gid));
+ switch (r) {
+ case STR_IS_NAME_COLON_DIGIT:
+ return NAME_ID_BOTH_GIVEN;
+ case STR_HAS_DIGIT_TOO_LARGE:
+ return NAME_ID_ERR_ID_TOO_LARGE;
+ case STR_HAS_DIGIT_BROKEN:
+ return NAME_ID_ERR_SYNTAX;
+ }
+
+ /* the operand is known to be single token */
+
+ r = try_as_simple_digit(tar_group, &(args->gid));
+ switch (r) {
+ case STR_IS_DIGIT_TOO_LARGE:
+ return NAME_ID_ERR_ID_TOO_LARGE;
+ case STR_IS_DIGIT_OK:
+ gr = getgrgid(args->gid);
+ if (!gr) {
+ args->gname = xstrdup("");
+ return NAME_ID_NAME_EMPTY;
+ }
+ args->gname = xstrdup(gr->gr_name);
+ return NAME_ID_NAME_GUESSED;
+ }
+
+ /* the operand is known to be non-digit */
+
+ args->gname = xstrdup(tar_group);
+ gr = getgrnam(tar_group);
+ if (!gr)
+ return NAME_ID_ID_UNTOUCHED;
+ args->gid = gr->gr_gid;
+ return NAME_ID_ID_GUESSED;
+}
+
+static void set_args_tar_owner_group(struct archiver_args *args,
+ const char *tar_owner, const char *tar_group)
+{
+ int r;
+
+ /* initialize by default values */
+ args->uname = xstrdup("root");
+ args->gname = xstrdup("root");
+ args->uid = 0;
+ args->gid = 0;
+
+ /*
+ * GNU tar --format=ustar checks if uid is in 0..209751.
+ * Too long digit string could not be dealt as numeric,
+ * it is rejected as a syntax error before range check.
+ */
+ r = set_args_uname_uid(args, tar_owner);
+ switch (r) {
+ case NAME_ID_ERR_ID_TOO_LARGE:
+ case NAME_ID_ERR_SYNTAX:
+ die("'%s': Invalid owner ID",
+ skip_leading_colon(tar_owner));
+ }
+ if (args->uid > MAX_ID_IN_TAR_US)
+ die("value %ld out of uid_t range 0..%ld", args->uid,
+ MAX_ID_IN_TAR_US);
+
+ r = set_args_gname_gid(args, tar_group);
+ switch (r) {
+ case NAME_ID_ERR_ID_TOO_LARGE:
+ case NAME_ID_ERR_SYNTAX:
+ die("'%s': Invalid group ID",
+ skip_leading_colon(tar_group));
+ }
+ if (args->gid > MAX_ID_IN_TAR_US)
+ die("value %ld out of gid_t range 0..%ld", args->gid,
+ MAX_ID_IN_TAR_US);
+}
+
static int parse_archive_args(int argc, const char **argv,
const struct archiver **ar, struct archiver_args *args,
const char *name_hint, int is_remote)
@@ -431,6 +649,8 @@ static int parse_archive_args(int argc, const char **argv,
int i;
int list = 0;
int worktree_attributes = 0;
+ const char *tar_owner = NULL;
+ const char *tar_group = NULL;
struct option opts[] = {
OPT_GROUP(""),
OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
@@ -459,6 +679,8 @@ static int parse_archive_args(int argc, const char **argv,
N_("retrieve the archive from remote repository <repo>")),
OPT_STRING(0, "exec", &exec, N_("command"),
N_("path to the remote git-upload-archive command")),
+ OPT_STRING(0, "owner", &tar_owner, N_("owner"), N_("<name[:uid]> in tar")),
+ OPT_STRING(0, "group", &tar_group, N_("group"), N_("<name[:gid]> in tar")),
OPT_END()
};
@@ -507,6 +729,8 @@ static int parse_archive_args(int argc, const char **argv,
args->baselen = strlen(base);
args->worktree_attributes = worktree_attributes;
+ set_args_tar_owner_group(args, tar_owner, tar_group);
+
return argc;
}
diff --git a/archive.h b/archive.h
index 62d1d82c1..b2cfb1e4e 100644
--- a/archive.h
+++ b/archive.h
@@ -15,6 +15,10 @@ struct archiver_args {
unsigned int worktree_attributes : 1;
unsigned int convert : 1;
int compression_level;
+ unsigned long uid;
+ unsigned long gid;
+ const char *uname;
+ const char *gname;
};
#define ARCHIVER_WANT_COMPRESSION_LEVELS 1
diff --git a/t/t5005-archive-uid-gid.sh b/t/t5005-archive-uid-gid.sh
new file mode 100755
index 000000000..c5e08d890
--- /dev/null
+++ b/t/t5005-archive-uid-gid.sh
@@ -0,0 +1,140 @@
+#!/bin/sh
+
+test_description='test --owner --group options for git-archive'
+. ./test-lib.sh
+
+test_expect_success 'create commit with a few empty files' '
+ git init . 1>/dev/null 2>/dev/null &&
+ touch uid-gid-test.001 &&
+ mkdir uid-gid-test.002 &&
+ mkdir uid-gid-test.002/uid-gid-test.003 &&
+ git add uid-gid-test.001 &&
+ git add uid-gid-test.002 &&
+ git add uid-gid-test.002/uid-gid-test.003 &&
+ git commit -m "uid-gid-test" 2>/dev/null 1>/dev/null
+'
+
+check_uid_gid_uname_gname_in_tar() {
+ # $1 tar pathname
+ # $2 uid (digit in string)
+ # $3 gid (digit in string)
+ # $4 uname (string)
+ # $5 gname (string)
+ uid=`python "$TEST_DIRECTORY"/t5005/parse-tar-file.py --print=uid --fail-if-multi $1`
+ if test $? != 0 -o x"${uid}" != "x"$2
+ then
+ echo "(some) uid differs from the specified value"
+ return $?
+ fi
+
+ gid=`python "$TEST_DIRECTORY"/t5005/parse-tar-file.py --print=gid --fail-if-multi $1`
+ if test $? != 0 -o x"${gid}" != "x"$3
+ then
+ echo "(some) gid differs from the specified value"
+ return $?
+ fi
+
+ uname=`python "$TEST_DIRECTORY"/t5005/parse-tar-file.py --print=uname --fail-if-multi $1`
+ if test $? != 0 -o x"${uname}" != "x"$4
+ then
+ echo "(some) uname differs from the specified value"
+ return $?
+ fi
+
+ gname=`python "$TEST_DIRECTORY"/t5005/parse-tar-file.py --print=gname --fail-if-multi $1`
+ if test $? != 0 -o x"${gname}" != "x"$5
+ then
+ echo "(some) gname differs from the specified value"
+ return $?
+ fi
+
+ return 0
+}
+
+test_expect_success 'test a case with explicitly specified name/id, owner=nobody:1234 group=nogroup:5678' '
+ git archive --format=tar --owner nobody:1234 --group nogroup:5678 HEAD > uid-gid-test1.tar &&
+ check_uid_gid_uname_gname_in_tar uid-gid-test1.tar 1234 5678 nobody nogroup &&
+ return $?
+'
+
+test_expect_success 'test a case with only string is given, owner=(current my name) group=(current my group)' '
+ my_uid=`id -u` &&
+ my_gid=`id -g` &&
+ my_uname=`id -u -n` &&
+ my_gname=`id -g -n` &&
+ git archive --format=tar --owner ${my_uname} --group ${my_gname} HEAD > uid-gid-test2.tar &&
+ check_uid_gid_uname_gname_in_tar uid-gid-test2.tar ${my_uid} ${my_gid} ${my_uname} ${my_gname} &&
+ return $?
+'
+
+test_expect_success 'test a case with only number is given, owner=(current my uid) group=(current my gid)' '
+ my_uid=`id -u` &&
+ my_gid=`id -g` &&
+ my_uname=`id -u -n` &&
+ my_gname=`id -g -n` &&
+ git archive --format=tar --owner ${my_uid} --group ${my_gid} HEAD > uid-gid-test3.tar &&
+ check_uid_gid_uname_gname_in_tar uid-gid-test3.tar ${my_uid} ${my_gid} ${my_uname} ${my_gname} &&
+ return $?
+'
+
+test_expect_success 'test a case with only uid is given, owner=(current my uid)' '
+ my_uid=`id -u` &&
+ my_gid=`id -g` &&
+ my_uname=`id -u -n` &&
+ my_gname=`id -g -n` &&
+ git archive --format=tar --owner ${my_uid} HEAD > uid-gid-test4.tar &&
+ check_uid_gid_uname_gname_in_tar uid-gid-test4.tar ${my_uid} ${my_gid} ${my_uname} ${my_gname} &&
+ return $?
+'
+
+test_expect_success 'test a case with no owner/group are given' '
+ git archive --format=tar HEAD > uid-gid-test5.tar &&
+ check_uid_gid_uname_gname_in_tar uid-gid-test5.tar 0 0 root root &&
+ return $?
+'
+
+test_expect_success 'test a case with max uid for ustar' '
+ git archive --format=tar --owner nobody:209751 --group nogroup:1234 HEAD > uid-gid-test6.tar &&
+ check_uid_gid_uname_gname_in_tar uid-gid-test6.tar 209751 1234 nobody nogroup &&
+ return $?
+'
+
+test_expect_success 'test a case with max gid for ustar' '
+ git archive --format=tar --group nogroup:209751 --owner nobody:1234 HEAD > uid-gid-test7.tar &&
+ check_uid_gid_uname_gname_in_tar uid-gid-test7.tar 1234 209751 nobody nogroup &&
+ return $?
+'
+
+test_expect_success 'test a case with uid greater than 32-bit (must fail)' '
+ test_must_fail git archive --format=tar --owner 4294967296 --group 1234 HEAD >/dev/null
+'
+
+test_expect_success 'test a case with gid greater than 32-bit (must fail)' '
+ test_must_fail git archive --format=tar --group 4294967296 --owner 1234 HEAD >/dev/null
+'
+
+test_expect_success 'test a case with uid greater than ustar limit (must fail)' '
+ test_must_fail git archive --format=tar --owner 2097152 --group 1234 HEAD >/dev/null
+'
+
+test_expect_success 'test a case with gid greater than ustar limit (must fail)' '
+ test_must_fail git archive --format=tar --group 2097152 --owner 1234 HEAD >/dev/null
+'
+
+test_expect_success 'test a case with valid username plus uid greater than 32-bit (must fail)' '
+ test_must_fail git archive --format=tar --owner nobody:4294967296 HEAD >/dev/null
+'
+
+test_expect_success 'test a case with valid groupname plus gid greater than 32-bit (must fail)' '
+ test_must_fail git archive --format=tar --group nogroup:4294967296 HEAD >/dev/null
+'
+
+test_expect_success 'test a case with valid username plus uid greater than ustar limit (must fail)' '
+ test_must_fail git archive --format=tar --owner nobody:2097152 HEAD >/dev/null
+'
+
+test_expect_success 'test a case with valid groupname plus gid greater than ustar limit (must fail)' '
+ test_must_fail git archive --format=tar --group nogroup:2097152 HEAD >/dev/null
+'
+
+test_done
diff --git a/t/t5005/parse-tar-file.py b/t/t5005/parse-tar-file.py
new file mode 100755
index 000000000..7d03b55d4
--- /dev/null
+++ b/t/t5005/parse-tar-file.py
@@ -0,0 +1,60 @@
+#!/usr/bin/env python
+
+import sys
+import getopt
+import tarfile
+
+optlist, args = getopt.getopt( sys.argv[1:], "", [
+ "print=", "show=",
+ "uniq",
+ "fail-if-multi",
+ ] )
+
+infos_to_print = []
+uniq = False
+fail_if_multi = False
+
+for opt in optlist:
+ if opt[0] == "--print":
+ infos_to_print.append(opt[1])
+ elif opt[0] == "--show":
+ infos_to_print.append(opt[1])
+ elif opt[0] == "--uniq":
+ uniq = True
+ elif opt[0] == "--fail-if-multi":
+ uniq = True
+ fail_if_multi = True
+
+if len(infos_to_print) == 0:
+ infos_to_print = ["uid", "gid", "uname", "gname", "name"]
+
+if len(args) > 0:
+ tar = tarfile.open( path=args[0], mode="r|" )
+else:
+ tar = tarfile.open( mode="r|", fileobj=sys.stdin )
+
+out_lines = []
+for tarinfo in tar:
+ infos = []
+ for info_tag in infos_to_print:
+ if info_tag == "uid":
+ infos.append( str(tarinfo.uid) )
+ elif info_tag == "gid":
+ infos.append( str(tarinfo.gid) )
+ elif info_tag == "uname" or info_tag == "owner":
+ infos.append( tarinfo.uname )
+ elif info_tag == "gname" or info_tag == "group":
+ infos.append( tarinfo.gname )
+ elif info_tag == "name" or info_tag == "pathname":
+ infos.append( tarinfo.name )
+ out_lines.append( "\t".join(infos) )
+tar.close()
+
+if uniq:
+ out_lines = list(set(out_lines))
+ if fail_if_multi and (len(out_lines) > 1):
+ sys.stderr.write("*** not unique value, " + str(len(out_lines)) + " values found\n")
+ sys.exit(len(out_lines))
+
+for line in out_lines:
+ print line
diff --git a/tar.h b/tar.h
index 3467705e9..1e6b57470 100644
--- a/tar.h
+++ b/tar.h
@@ -5,6 +5,8 @@
#define TYPEFLAG_GLOBAL_HEADER 'g'
#define TYPEFLAG_EXT_HEADER 'x'
+#define MAX_ID_IN_TAR_US 0x1FFFFFUL
+
struct ustar_header {
char name[100]; /* 0 */
char mode[8]; /* 100 */
--
2.11.0
next reply other threads:[~2017-12-29 14:05 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-29 14:05 suzuki toshiya [this message]
2018-01-01 18:29 ` [PATCH] git-archive: accept --owner and --group like GNU tar René Scharfe
2018-01-02 0:32 ` Perry Hutchison
2018-01-04 0:43 ` René Scharfe
[not found] ` <df39f62558314cf6a9d9df3e23f31dd8@OS2PR01MB1147.jpnprd01.prod.outlook.com>
2018-01-02 6:58 ` suzuki toshiya
2018-01-02 21:36 ` René Scharfe
[not found] ` <59a1fc058278463996ed68c970a5e08a@OS2PR01MB1147.jpnprd01.prod.outlook.com>
2018-01-04 1:29 ` suzuki toshiya
[not found] ` <955dae095d504b00b3e1c8a956ba852a@OS2PR01MB1147.jpnprd01.prod.outlook.com>
2018-01-04 2:25 ` suzuki toshiya
2018-01-04 16:59 ` René Scharfe
2018-01-04 18:22 ` Junio C Hamano
2018-01-05 13:54 ` René Scharfe
2018-01-05 19:10 ` Junio C Hamano
[not found] ` <2112f9c245d64f4e89361df7e9de9374@OS2PR01MB1147.jpnprd01.prod.outlook.com>
2018-01-05 4:23 ` suzuki toshiya
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--in-reply-to=20171229140535.10746-1-mpsuzuki@hiroshima-u.ac.jp \
--to=mpsuzuki@hiroshima-u.ac.jp \
--cc=git@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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