Add README and license

10 files changed, 809 insertions, 0 deletions

diff --git a/.editorconfig b/.editorconfig
index 4afc589..df38fb8 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -1,3 +1,44 @@
+# Copyright 2020 Alyssa Ross
+#
+# This file is part of pushmail.
+#
+# pushmail is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# pushmail is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with pushmail; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# Linking pushmail statically or dynamically with other modules is
+# making a combined work based on pushmail.  Thus, the terms and
+# conditions of the GNU General Public License cover the whole
+# combination.
+#
+# In addition, as a special exception, the copyright holders of
+# pushmail give you permission to combine pushmail with free software
+# programs or libraries that are released under the GNU LGPL and with
+# code included in the standard release of OpenSSL under the OpenSSL
+# License or the Original SSLeay License (or modified versions of such
+# code, with unchanged license).  You may copy and distribute such a
+# system following the terms of the GNU GPL for pushmail and the
+# licenses of the other code concerned, provided that you include the
+# source code of that other code when and as the GNU GPL requires
+# distribution of source code.
+#
+# Note that people who make modified versions of pushmail are not
+# obligated to grant this special exception for their modified
+# versions; it is their choice whether to do so.  The GNU General
+# Public License gives permission to release a modified version
+# without this exception; this exception also makes it possible to
+# release a modified version which carries forward this exception.
+
 root = true
 
 [*]
diff --git a/.gitignore b/.gitignore
index 53eaa21..a1e31a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,43 @@
+# Copyright 2020 Alyssa Ross
+#
+# This file is part of pushmail.
+#
+# pushmail is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# pushmail is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with pushmail; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# Linking pushmail statically or dynamically with other modules is
+# making a combined work based on pushmail.  Thus, the terms and
+# conditions of the GNU General Public License cover the whole
+# combination.
+#
+# In addition, as a special exception, the copyright holders of
+# pushmail give you permission to combine pushmail with free software
+# programs or libraries that are released under the GNU LGPL and with
+# code included in the standard release of OpenSSL under the OpenSSL
+# License or the Original SSLeay License (or modified versions of such
+# code, with unchanged license).  You may copy and distribute such a
+# system following the terms of the GNU GPL for pushmail and the
+# licenses of the other code concerned, provided that you include the
+# source code of that other code when and as the GNU GPL requires
+# distribution of source code.
+#
+# Note that people who make modified versions of pushmail are not
+# obligated to grant this special exception for their modified
+# versions; it is their choice whether to do so.  The GNU General
+# Public License gives permission to release a modified version
+# without this exception; this exception also makes it possible to
+# release a modified version which carries forward this exception.
+
 /target
 **/*.rs.bk
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..d159169
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
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+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
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+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
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+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/Cargo.toml b/Cargo.toml
index 1b696d7..900838a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,50 @@
+# Copyright 2020 Alyssa Ross
+#
+# This file is part of pushmail.
+#
+# pushmail is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# pushmail is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with pushmail; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# Linking pushmail statically or dynamically with other modules is
+# making a combined work based on pushmail.  Thus, the terms and
+# conditions of the GNU General Public License cover the whole
+# combination.
+#
+# In addition, as a special exception, the copyright holders of
+# pushmail give you permission to combine pushmail with free software
+# programs or libraries that are released under the GNU LGPL and with
+# code included in the standard release of OpenSSL under the OpenSSL
+# License or the Original SSLeay License (or modified versions of such
+# code, with unchanged license).  You may copy and distribute such a
+# system following the terms of the GNU GPL for pushmail and the
+# licenses of the other code concerned, provided that you include the
+# source code of that other code when and as the GNU GPL requires
+# distribution of source code.
+#
+# Note that people who make modified versions of pushmail are not
+# obligated to grant this special exception for their modified
+# versions; it is their choice whether to do so.  The GNU General
+# Public License gives permission to release a modified version
+# without this exception; this exception also makes it possible to
+# release a modified version which carries forward this exception.
+
 [package]
 name = "pushmail"
 version = "0.1.0"
 authors = ["Alyssa Ross <hi@alyssa.is>"]
 edition = "2018"
+license = "GPL-2.0-or-later"
 
 [dependencies]
 graphql_client = "0.8.0"
diff --git a/Makefile b/Makefile
index e608a13..f359e01 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,44 @@
+# Copyright 2020 Alyssa Ross
+#
+# This file is part of pushmail.
+#
+# pushmail is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# pushmail is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with pushmail; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# Linking pushmail statically or dynamically with other modules is
+# making a combined work based on pushmail.  Thus, the terms and
+# conditions of the GNU General Public License cover the whole
+# combination.
+#
+# In addition, as a special exception, the copyright holders of
+# pushmail give you permission to combine pushmail with free software
+# programs or libraries that are released under the GNU LGPL and with
+# code included in the standard release of OpenSSL under the OpenSSL
+# License or the Original SSLeay License (or modified versions of such
+# code, with unchanged license).  You may copy and distribute such a
+# system following the terms of the GNU GPL for pushmail and the
+# licenses of the other code concerned, provided that you include the
+# source code of that other code when and as the GNU GPL requires
+# distribution of source code.
+#
+# Note that people who make modified versions of pushmail are not
+# obligated to grant this special exception for their modified
+# versions; it is their choice whether to do so.  The GNU General
+# Public License gives permission to release a modified version
+# without this exception; this exception also makes it possible to
+# release a modified version which carries forward this exception.
+
 CARGO = cargo
 INSTALL = install
 INSTALL_PROGRAM = $(INSTALL)
diff --git a/README b/README
new file mode 100644
index 0000000..53604a8
--- /dev/null
+++ b/README
@@ -0,0 +1,124 @@
+pushmail
+========
+
+Monitor commits to a GitHub repository, and send notification emails
+when commits are pushed directly to a ref rather than through a
+Pull Request.
+
+pushmail is designed to be resilient.  Most failure modes, including
+sudden power loss, should result in pushmail simply carrying on from
+where it left off next time it is run.  In the worst case, a single
+notification message per failure will be dropped.  It will never
+double-send a notification on its own.
+
+
+Installation
+------------
+
+Build dependencies:
+ - Cargo
+ - rustc
+ - pkg-config
+
+Runtime dependencies:
+ - Git
+ - OpenSSL
+ - a `sendmail' program
+
+In most cases, installation should be as simple as
+
+	make install
+
+
+Usage
+-----
+
+The `pushmail' program should be run either on a timer, or in response
+to a GitHub webhook.
+
+The program must be supplied with a local checkout of the monitored
+git repository, the full repository name on GitHub (i.e. owner/repo),
+a GitHub API token, and a mailbox to deliver notification messages to.
+
+It is also possible to configure the From address in notification
+messages, and the git ref to be monitored.
+
+For example:
+
+	pushmail \
+		--from "Nixpkgs Direct Pushes <pushmail@atuin.qyliss.net>" \
+		--ref "staging" \
+		/var/lib/pushmail/nixpkgs.git \
+		NixOS/nixpkgs \
+		"Alyssa Ross <hi@alyssa.is>" \
+		< /var/lib/pushmail/token
+
+
+Further information on available command line arguments can be
+obtained with
+
+	pushmail --help
+
+The first time it is run, pushmail will set its cursor (which is a
+branch in the local git checkout) to the commit currently pointed to
+by the monitored ref.  In subsequent runs, pushmail will advance
+forwards through the history from the current cursor, checking for
+directly-pushed commits, and sending notifications as appropriate.
+The cursor is updated after every checked commit to limit the amount
+of work that needs to be redone in the event of a crash.
+
+
+Development
+-----------
+
+The upstream git repository for pushmail is available at
+<https://git.qyliss.net/pushmail/>.
+
+Bugs and patches can be sent to the author,
+Alyssa Ross <hi@alyssa.is>.
+
+For information about how to use git to send a patch email, see
+<https://git-send-email.io/>.
+
+
+License
+-------
+
+Copyright 2020 Alyssa Ross.
+
+pushmail is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+pushmail is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with pushmail; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+Linking pushmail statically or dynamically with other modules is
+making a combined work based on pushmail.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+In addition, as a special exception, the copyright holders of
+pushmail give you permission to combine pushmail with free software
+programs or libraries that are released under the GNU LGPL and with
+code included in the standard release of OpenSSL under the OpenSSL
+License or the Original SSLeay License (or modified versions of
+such code, with unchanged license).  You may copy and distribute
+such a system following the terms of the GNU GPL for pushmail and
+the licenses of the other code concerned, provided that you include
+the source code of that other code when and as the GNU GPL requires
+distribution of source code.
+
+Note that people who make modified versions of pushmail are not
+obligated to grant this special exception for their modified
+versions; it is their choice whether to do so.  The GNU General
+Public License gives permission to release a modified version
+without this exception; this exception also makes it possible to
+release a modified version which carries forward this exception.
diff --git a/deny.toml b/deny.toml
new file mode 100644
index 0000000..3edb075
--- /dev/null
+++ b/deny.toml
@@ -0,0 +1,58 @@
+# Copyright 2020 Alyssa Ross
+#
+# This file is part of pushmail.
+#
+# pushmail is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# 
+# pushmail is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with pushmail; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# Linking pushmail statically or dynamically with other modules is
+# making a combined work based on pushmail. Thus, the terms and
+# conditions of the GNU General Public License cover the whole
+# combination.
+# 
+# In addition, as a special exception, the copyright holders of
+# pushmail give you permission to combine pushmail with free software
+# programs or libraries that are released under the GNU LGPL and with
+# code included in the standard release of OpenSSL under the OpenSSL
+# License or the Original SSLeay License (or modified versions of such
+# code, with unchanged license). You may copy and distribute such a
+# system following the terms of the GNU GPL for pushmail and the
+# licenses of the other code concerned, provided that you include the
+# source code of that other code when and as the GNU GPL requires
+# distribution of source code.
+# 
+# Note that people who make modified versions of pushmail are not
+# obligated to grant this special exception for their modified
+# versions; it is their choice whether to do so. The GNU General
+# Public License gives permission to release a modified version
+# without this exception; this exception also makes it possible to
+# release a modified version which carries forward this exception.
+
+# The purpose of this file is to check that all dependencies are
+# available under licenses that are compatible with the GPLv2 and
+# later versions.  Notably, the Apache-2.0 license is not compatible
+# with the GPLv2.  If we need to depend on a library available only
+# under Apache-2.0, we'd need to bump the GPL minimum to 3.0.
+# Additionally, if we added a dependency on a GPL library, we'd need
+# to make sure pushmail was only licensed under a subset of the GPL
+# versions that library is licensed under, and that, like us, the
+# library offered an exception for linking with OpenSSL.
+
+[licenses]
+unlicensed = "deny"
+copyleft = "allow"
+allow = [
+    "MIT",
+    "BSL-1.0",
+]
diff --git a/src/commit_pr.graphql b/src/commit_pr.graphql
index b231038..539f28f 100644
--- a/src/commit_pr.graphql
+++ b/src/commit_pr.graphql
@@ -1,3 +1,44 @@
+# Copyright 2020 Alyssa Ross
+#
+# This file is part of pushmail.
+#
+# pushmail is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# pushmail is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with pushmail; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# Linking pushmail statically or dynamically with other modules is
+# making a combined work based on pushmail.  Thus, the terms and
+# conditions of the GNU General Public License cover the whole
+# combination.
+#
+# In addition, as a special exception, the copyright holders of
+# pushmail give you permission to combine pushmail with free software
+# programs or libraries that are released under the GNU LGPL and with
+# code included in the standard release of OpenSSL under the OpenSSL
+# License or the Original SSLeay License (or modified versions of such
+# code, with unchanged license).  You may copy and distribute such a
+# system following the terms of the GNU GPL for pushmail and the
+# licenses of the other code concerned, provided that you include the
+# source code of that other code when and as the GNU GPL requires
+# distribution of source code.
+#
+# Note that people who make modified versions of pushmail are not
+# obligated to grant this special exception for their modified
+# versions; it is their choice whether to do so.  The GNU General
+# Public License gives permission to release a modified version
+# without this exception; this exception also makes it possible to
+# release a modified version which carries forward this exception.
+
 query CommitPRQuery($owner: String!, $repo: String!, $oid: GitObjectID) {
   repository(owner: $owner, name: $repo) {
     object(oid: $oid) {
diff --git a/src/main.rs b/src/main.rs
index 3d68b30..e2587f8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,44 @@
+// Copyright 2020 Alyssa Ross
+//
+// This file is part of pushmail.
+//
+// pushmail is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// pushmail is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with pushmail; if not, write to the Free Software Foundation,
+// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+//
+// Linking pushmail statically or dynamically with other modules is
+// making a combined work based on pushmail.  Thus, the terms and
+// conditions of the GNU General Public License cover the whole
+// combination.
+//
+// In addition, as a special exception, the copyright holders of
+// pushmail give you permission to combine pushmail with free software
+// programs or libraries that are released under the GNU LGPL and with
+// code included in the standard release of OpenSSL under the OpenSSL
+// License or the Original SSLeay License (or modified versions of
+// such code, with unchanged license).  You may copy and distribute
+// such a system following the terms of the GNU GPL for pushmail and
+// the licenses of the other code concerned, provided that you include
+// the source code of that other code when and as the GNU GPL requires
+// distribution of source code.
+//
+// Note that people who make modified versions of pushmail are not
+// obligated to grant this special exception for their modified
+// versions; it is their choice whether to do so.  The GNU General
+// Public License gives permission to release a modified version
+// without this exception; this exception also makes it possible to
+// release a modified version which carries forward this exception.
+
 mod util;
 
 use clap::clap_app;
diff --git a/src/util.rs b/src/util.rs
index 8302ed6..4ee4c4e 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -1,3 +1,44 @@
+// Copyright 2020 Alyssa Ross
+//
+// This file is part of pushmail.
+//
+// pushmail is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// pushmail is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with pushmail; if not, write to the Free Software Foundation,
+// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+//
+// Linking pushmail statically or dynamically with other modules is
+// making a combined work based on pushmail.  Thus, the terms and
+// conditions of the GNU General Public License cover the whole
+// combination.
+//
+// In addition, as a special exception, the copyright holders of
+// pushmail give you permission to combine pushmail with free software
+// programs or libraries that are released under the GNU LGPL and with
+// code included in the standard release of OpenSSL under the OpenSSL
+// License or the Original SSLeay License (or modified versions of
+// such code, with unchanged license).  You may copy and distribute
+// such a system following the terms of the GNU GPL for pushmail and
+// the licenses of the other code concerned, provided that you include
+// the source code of that other code when and as the GNU GPL requires
+// distribution of source code.
+//
+// Note that people who make modified versions of pushmail are not
+// obligated to grant this special exception for their modified
+// versions; it is their choice whether to do so.  The GNU General
+// Public License gives permission to release a modified version
+// without this exception; this exception also makes it possible to
+// release a modified version which carries forward this exception.
+
 use std::io::prelude::*;
 use std::io::{ErrorKind, self};
 use std::ffi::OsString;