Update debian/changelog for 0.4.2-1~agwa1

git-crypt 0.4.2

git-crypt 0.4.2 is a bugfix-only release that fixes the unlock (and lock)
commands under Git 2.2.2 and newer.  Due to an optimization introduced in
Git 2.2.2, 'git-crypt unlock' would not decrypt files in the working tree.

In addition, this version of git-crypt officially drops support for
versions of Git older than 1.7.2.

INSTALL

@@ -2,10 +2,8 @@ DEPENDENCIES
 
 To use git-crypt, you need:
 
-	* Git 1.6.0 or newer
+	* Git 1.7.2 or newer
 	* OpenSSL
-	* For decrypted git diff output, Git 1.6.1 or newer
-	* For decrypted git blame output, Git 1.7.2 or newer
 
 To build git-crypt, you need a C++ compiler and OpenSSL development
 headers.

INSTALL.md

@@ -3,10 +3,8 @@ Dependencies
 
 To use git-crypt, you need:
 
-*   Git 1.6.0 or newer
+*   Git 1.7.2 or newer
 *   OpenSSL
-*   For decrypted git diff output, Git 1.6.1 or newer
-*   For decrypted git blame output, Git 1.7.2 or newer
 
 To build git-crypt, you need a C++ compiler and OpenSSL development
 headers.

Makefile

@@ -25,7 +25,7 @@ util.o: util.cpp util-unix.cpp util-win32.cpp
 clean:
 	rm -f *.o git-crypt
 
-install:
+install: git-crypt
 	install -m 755 git-crypt $(DESTDIR)$(PREFIX)/bin/
 
 .PHONY: all clean install

NEWS

@@ -1,3 +1,13 @@
+v0.4.2 (2015-01-31)
+  * Fix unlock and lock under Git 2.2.2 and higher.
+  * Drop support for versions of Git older than 1.7.2.
+  * Minor improvements to some help/error messages.
+
+v0.4.1 (2015-01-08)
+  * Important usability fix to ensure that the .git-crypt directory
+    can't be encrypted by accident (see RELEASE_NOTES-0.4.1.md for
+    more information).
+
 v0.4 (2014-11-16)
   (See RELEASE_NOTES-0.4.md for important details.)
   * Add optional GPG support: GPG can be used to share the repository

NEWS.md

@@ -1,6 +1,16 @@
 News
 ====
 
+######v0.4.2 (2015-01-31)
+* Fix unlock and lock under Git 2.2.2 and higher.
+* Drop support for versions of Git older than 1.7.2.
+* Minor improvements to some help/error messages.
+
+######v0.4.1 (2015-01-08)
+* Important usability fix to ensure that the .git-crypt directory
+  can't be encrypted by accident (see
+  [the release notes](RELEASE_NOTES-0.4.1.md) for more information).
+
 ######v0.4 (2014-11-16)
 (See [the release notes](RELEASE_NOTES-0.4.md) for important details.)
 *   Add optional GPG support: GPG can be used to share the repository

README

@@ -66,7 +66,7 @@ encryption and decryption happen transparently.
 
 CURRENT STATUS
 
-The latest version of git-crypt is 0.4, released on 2014-11-16.
+The latest version of git-crypt is 0.4.2, released on 2015-01-31.
 git-crypt aims to be bug-free and reliable, meaning it shouldn't
 crash, malfunction, or expose your confidential data.  However,
 it has not yet reached maturity, meaning it is not as documented,
@@ -145,5 +145,5 @@ MAILING LISTS
 To stay abreast of, and provide input to, git-crypt development, consider
 subscribing to one or both of our mailing lists:
 
-Announcements: http://lists.cloudmutt.com/mailman/listinfo/git-crypt-announce
-Discussion:    http://lists.cloudmutt.com/mailman/listinfo/git-crypt-discuss
+Announcements: https://lists.cloudmutt.com/mailman/listinfo/git-crypt-announce
+Discussion:    https://lists.cloudmutt.com/mailman/listinfo/git-crypt-discuss

README.md

@@ -67,8 +67,8 @@ encryption and decryption happen transparently.
 Current Status
 --------------
 
-The latest version of git-crypt is [0.4](RELEASE_NOTES-0.4.md), released on
-2014-11-16.  git-crypt aims to be bug-free and reliable, meaning it
+The latest version of git-crypt is [0.4.2](NEWS.md), released on
+2015-01-31.  git-crypt aims to be bug-free and reliable, meaning it
 shouldn't crash, malfunction, or expose your confidential data.
 However, it has not yet reached maturity, meaning it is not as
 documented, featureful, or easy-to-use as it should be.  Additionally,
@@ -147,5 +147,5 @@ Mailing Lists
 To stay abreast of, and provide input to, git-crypt development,
 consider subscribing to one or both of our mailing lists:
 
-* [Announcements](http://lists.cloudmutt.com/mailman/listinfo/git-crypt-announce)
-* [Discussion](http://lists.cloudmutt.com/mailman/listinfo/git-crypt-discuss)
+* [Announcements](https://lists.cloudmutt.com/mailman/listinfo/git-crypt-announce)
+* [Discussion](https://lists.cloudmutt.com/mailman/listinfo/git-crypt-discuss)

RELEASE_NOTES-0.4.1.md

@@ -0,0 +1,21 @@
+git-crypt 0.4.1 is a bugfix-only release that contains an important
+usability fix for users who use GPG mode to encrypt an entire repository.
+
+Previously, if you used a '*' pattern in the top-level .gitattributes
+file, and you did not explicitly add a pattern to exclude the .git-crypt
+directory, the files contained therein would be encrypted, rendering
+the repository impossible to unlock with GPG.
+
+git-crypt now adds a .gitattributes file to the .git-crypt directory
+to prevent its contents from being encrypted, regardless of patterns in
+the top-level .gitattributes.
+
+If you are using git-crypt in GPG mode to encrypt an entire repository,
+and you do not already have a .gitattributes pattern to exclude the
+.git-crypt directory, you are strongly advised to upgrade.  After
+upgrading, you should do the following in each of your repositories to
+ensure that the information inside .git-crypt is properly stored:
+
+1. Remove existing key files: `rm .git-crypt/keys/*/0/*`
+
+2. Re-add GPG user(s): `git-crypt add-gpg-user GPG_USER_ID ...`

commands.cpp

@@ -49,6 +49,17 @@
 #include <errno.h>
 #include <vector>
 
+static std::string attribute_name (const char* key_name)
+{
+	if (key_name) {
+		// named key
+		return std::string("git-crypt-") + key_name;
+	} else {
+		// default key
+		return "git-crypt";
+	}
+}
+
 static void git_config (const std::string& name, const std::string& value)
 {
 	std::vector<std::string>	command;
@@ -99,31 +110,20 @@ static void configure_git_filters (const char* key_name)
 static void unconfigure_git_filters (const char* key_name)
 {
 	// unconfigure the git-crypt filters
-	if (key_name) {
-		// named key
-		git_unconfig(std::string("filter.git-crypt-") + key_name);
-		git_unconfig(std::string("diff.git-crypt-") + key_name);
-	} else {
-		// default key
-		git_unconfig("filter.git-crypt");
-		git_unconfig("diff.git-crypt");
-	}
+	git_unconfig("filter." + attribute_name(key_name));
+	git_unconfig("diff." + attribute_name(key_name));
 }
 
-static bool git_checkout_head (const std::string& top_dir)
+static bool git_checkout (const std::vector<std::string>& paths)
 {
 	std::vector<std::string>	command;
 
 	command.push_back("git");
 	command.push_back("checkout");
-	command.push_back("-f");
-	command.push_back("HEAD");
 	command.push_back("--");
 
-	if (top_dir.empty()) {
-		command.push_back(".");
-	} else {
-		command.push_back(top_dir);
+	for (std::vector<std::string>::const_iterator path(paths.begin()); path != paths.end(); ++path) {
+		command.push_back(*path);
 	}
 
 	if (!successful_exit(exec_command(command))) {
@@ -146,7 +146,7 @@ static void validate_key_name_or_throw (const char* key_name)
 	}
 }
 
-static std::string get_internal_keys_path ()
+static std::string get_internal_state_path ()
 {
 	// git rev-parse --git-dir
 	std::vector<std::string>	command;
@@ -162,11 +162,21 @@ static std::string get_internal_keys_path ()
 
 	std::string			path;
 	std::getline(output, path);
-	path += "/git-crypt/keys";
+	path += "/git-crypt";
 
 	return path;
 }
 
+static std::string get_internal_keys_path (const std::string& internal_state_path)
+{
+	return internal_state_path + "/keys";
+}
+
+static std::string get_internal_keys_path ()
+{
+	return get_internal_keys_path(get_internal_state_path());
+}
+
 static std::string get_internal_key_path (const char* key_name)
 {
 	std::string		path(get_internal_keys_path());
@@ -176,7 +186,7 @@ static std::string get_internal_key_path (const char* key_name)
 	return path;
 }
 
-static std::string get_repo_keys_path ()
+static std::string get_repo_state_path ()
 {
 	// git rev-parse --show-toplevel
 	std::vector<std::string>	command;
@@ -198,10 +208,20 @@ static std::string get_repo_keys_path ()
 		throw Error("Could not determine Git working tree - is this a non-bare repo?");
 	}
 
-	path += "/.git-crypt/keys";
+	path += "/.git-crypt";
 	return path;
 }
 
+static std::string get_repo_keys_path (const std::string& repo_state_path)
+{
+	return repo_state_path + "/keys";
+}
+
+static std::string get_repo_keys_path ()
+{
+	return get_repo_keys_path(get_repo_state_path());
+}
+
 static std::string get_path_to_top ()
 {
 	// git rev-parse --show-cdup
@@ -236,18 +256,6 @@ static void get_git_status (std::ostream& output)
 	}
 }
 
-static bool check_if_head_exists ()
-{
-	// git rev-parse HEAD
-	std::vector<std::string>	command;
-	command.push_back("git");
-	command.push_back("rev-parse");
-	command.push_back("HEAD");
-
-	std::stringstream		output;
-	return successful_exit(exec_command(command, output));
-}
-
 // returns filter and diff attributes as a pair
 static std::pair<std::string, std::string> get_file_attributes (const std::string& filename)
 {
@@ -348,6 +356,35 @@ static bool check_if_file_is_encrypted (const std::string& filename)
 	return check_if_blob_is_encrypted(object_id);
 }
 
+static void get_encrypted_files (std::vector<std::string>& files, const char* key_name)
+{
+	// git ls-files -cz -- path_to_top
+	std::vector<std::string>	command;
+	command.push_back("git");
+	command.push_back("ls-files");
+	command.push_back("-cz");
+	command.push_back("--");
+	const std::string		path_to_top(get_path_to_top());
+	if (!path_to_top.empty()) {
+		command.push_back(path_to_top);
+	}
+
+	std::stringstream		output;
+	if (!successful_exit(exec_command(command, output))) {
+		throw Error("'git ls-files' failed - is this a Git repository?");
+	}
+
+	while (output.peek() != -1) {
+		std::string		filename;
+		std::getline(output, filename, '\0');
+
+		// TODO: get file attributes en masse for efficiency... unfortunately this requires machine-parseable output from git check-attr to be workable, and this is only supported in Git 1.8.5 and above (released 27 Nov 2013)
+		if (get_file_attributes(filename).first == attribute_name(key_name)) {
+			files.push_back(filename);
+		}
+	}
+}
+
 static void load_key (Key_file& key_file, const char* key_name, const char* key_path =0, const char* legacy_path =0)
 {
 	if (legacy_path) {
@@ -761,25 +798,18 @@ void help_unlock (std::ostream& out)
 }
 int unlock (int argc, const char** argv)
 {
-	// 0. Make sure working directory is clean (ignoring untracked files)
-	// We do this because we run 'git checkout -f HEAD' later and we don't
-	// want the user to lose any changes.  'git checkout -f HEAD' doesn't touch
-	// untracked files so it's safe to ignore those.
+	// 1. Make sure working directory is clean (ignoring untracked files)
+	// We do this because we check out files later, and we don't want the
+	// user to lose any changes.  (TODO: only care if encrypted files are
+	// modified, since we only check out encrypted files)
 
 	// Running 'git status' also serves as a check that the Git repo is accessible.
 
 	std::stringstream	status_output;
 	get_git_status(status_output);
-
-	// 1. Check to see if HEAD exists.  See below why we do this.
-	bool			head_exists = check_if_head_exists();
-
-	if (status_output.peek() != -1 && head_exists) {
-		// We only care that the working directory is dirty if HEAD exists.
-		// If HEAD doesn't exist, we won't be resetting to it (see below) so
-		// it doesn't matter that the working directory is dirty.
+	if (status_output.peek() != -1) {
 		std::clog << "Error: Working directory not clean." << std::endl;
-		std::clog << "Please commit your changes or 'git stash' them before running 'git-crypt' unlock." << std::endl;
+		std::clog << "Please commit your changes or 'git stash' them before running 'git-crypt unlock'." << std::endl;
 		return 1;
 	}
 
@@ -830,13 +860,14 @@ int unlock (int argc, const char** argv)
 		if (!decrypt_repo_keys(key_files, 0, gpg_secret_keys, repo_keys_path)) {
 			std::clog << "Error: no GPG secret key available to unlock this repository." << std::endl;
 			std::clog << "To unlock with a shared symmetric key instead, specify the path to the symmetric key as an argument to 'git-crypt unlock'." << std::endl;
-			std::clog << "To see a list of GPG keys authorized to unlock this repository, run 'git-crypt ls-collabs'." << std::endl;
+			// TODO std::clog << "To see a list of GPG keys authorized to unlock this repository, run 'git-crypt ls-gpg-users'." << std::endl;
 			return 1;
 		}
 	}
 
 
 	// 4. Install the key(s) and configure the git filters
+	std::vector<std::string>	encrypted_files;
 	for (std::vector<Key_file>::iterator key_file(key_files.begin()); key_file != key_files.end(); ++key_file) {
 		std::string		internal_key_path(get_internal_key_path(key_file->get_key_name()));
 		// TODO: croak if internal_key_path already exists???
@@ -847,18 +878,18 @@ int unlock (int argc, const char** argv)
 		}
 
 		configure_git_filters(key_file->get_key_name());
+		get_encrypted_files(encrypted_files, key_file->get_key_name());
 	}
 
-	// 5. Do a force checkout so any files that were previously checked out encrypted
-	//    will now be checked out decrypted.
-	// If HEAD doesn't exist (perhaps because this repo doesn't have any files yet)
-	// just skip the checkout.
-	if (head_exists) {
-		if (!git_checkout_head(path_to_top)) {
-			std::clog << "Error: 'git checkout' failed" << std::endl;
-			std::clog << "git-crypt has been set up but existing encrypted files have not been decrypted" << std::endl;
-			return 1;
-		}
+	// 5. Check out the files that are currently encrypted.
+	// Git won't check out a file if its mtime hasn't changed, so touch every file first.
+	for (std::vector<std::string>::const_iterator file(encrypted_files.begin()); file != encrypted_files.end(); ++file) {
+		touch_file(*file);
+	}
+	if (!git_checkout(encrypted_files)) {
+		std::clog << "Error: 'git checkout' failed" << std::endl;
+		std::clog << "git-crypt has been set up but existing encrypted files have not been decrypted" << std::endl;
+		return 1;
 	}
 
 	return 0;
@@ -896,25 +927,18 @@ int lock (int argc, const char** argv)
 		return 2;
 	}
 
-	// 0. Make sure working directory is clean (ignoring untracked files)
-	// We do this because we run 'git checkout -f HEAD' later and we don't
-	// want the user to lose any changes.  'git checkout -f HEAD' doesn't touch
-	// untracked files so it's safe to ignore those.
+	// 1. Make sure working directory is clean (ignoring untracked files)
+	// We do this because we check out files later, and we don't want the
+	// user to lose any changes.  (TODO: only care if encrypted files are
+	// modified, since we only check out encrypted files)
 
 	// Running 'git status' also serves as a check that the Git repo is accessible.
 
 	std::stringstream	status_output;
 	get_git_status(status_output);
-
-	// 1. Check to see if HEAD exists.  See below why we do this.
-	bool			head_exists = check_if_head_exists();
-
-	if (status_output.peek() != -1 && head_exists) {
-		// We only care that the working directory is dirty if HEAD exists.
-		// If HEAD doesn't exist, we won't be resetting to it (see below) so
-		// it doesn't matter that the working directory is dirty.
+	if (status_output.peek() != -1) {
 		std::clog << "Error: Working directory not clean." << std::endl;
-		std::clog << "Please commit your changes or 'git stash' them before running 'git-crypt' lock." << std::endl;
+		std::clog << "Please commit your changes or 'git stash' them before running 'git-crypt lock'." << std::endl;
 		return 1;
 	}
 
@@ -924,6 +948,7 @@ int lock (int argc, const char** argv)
 	std::string		path_to_top(get_path_to_top());
 
 	// 3. unconfigure the git filters and remove decrypted keys
+	std::vector<std::string>	encrypted_files;
 	if (all_keys) {
 		// unconfigure for all keys
 		std::vector<std::string> dirents = get_directory_contents(get_internal_keys_path().c_str());
@@ -932,6 +957,7 @@ int lock (int argc, const char** argv)
 			const char* this_key_name = (*dirent == "default" ? 0 : dirent->c_str());
 			remove_file(get_internal_key_path(this_key_name));
 			unconfigure_git_filters(this_key_name);
+			get_encrypted_files(encrypted_files, this_key_name);
 		}
 	} else {
 		// just handle the given key
@@ -947,18 +973,18 @@ int lock (int argc, const char** argv)
 
 		remove_file(internal_key_path);
 		unconfigure_git_filters(key_name);
+		get_encrypted_files(encrypted_files, key_name);
 	}
 
-	// 4. Do a force checkout so any files that were previously checked out decrypted
-	//    will now be checked out encrypted.
-	// If HEAD doesn't exist (perhaps because this repo doesn't have any files yet)
-	// just skip the checkout.
-	if (head_exists) {
-		if (!git_checkout_head(path_to_top)) {
-			std::clog << "Error: 'git checkout' failed" << std::endl;
-			std::clog << "git-crypt has been locked but up but existing decrypted files have not been encrypted" << std::endl;
-			return 1;
-		}
+	// 4. Check out the files that are currently decrypted but should be encrypted.
+	// Git won't check out a file if its mtime hasn't changed, so touch every file first.
+	for (std::vector<std::string>::const_iterator file(encrypted_files.begin()); file != encrypted_files.end(); ++file) {
+		touch_file(*file);
+	}
+	if (!git_checkout(encrypted_files)) {
+		std::clog << "Error: 'git checkout' failed" << std::endl;
+		std::clog << "git-crypt has been locked but up but existing decrypted files have not been encrypted" << std::endl;
+		return 1;
 	}
 
 	return 0;
@@ -1015,10 +1041,23 @@ int add_gpg_user (int argc, const char** argv)
 		return 1;
 	}
 
-	std::string			keys_path(get_repo_keys_path());
+	const std::string		state_path(get_repo_state_path());
 	std::vector<std::string>	new_files;
 
-	encrypt_repo_key(key_name, *key, collab_keys, keys_path, &new_files);
+	encrypt_repo_key(key_name, *key, collab_keys, get_repo_keys_path(state_path), &new_files);
+
+	// Add a .gitatributes file to the repo state directory to prevent files in it from being encrypted.
+	const std::string		state_gitattributes_path(state_path + "/.gitattributes");
+	if (access(state_gitattributes_path.c_str(), F_OK) != 0) {
+		std::ofstream		state_gitattributes_file(state_gitattributes_path.c_str());
+		state_gitattributes_file << "* !filter !diff\n";
+		state_gitattributes_file.close();
+		if (!state_gitattributes_file) {
+			std::clog << "Error: unable to write " << state_gitattributes_path << std::endl;
+			return 1;
+		}
+		new_files.push_back(state_gitattributes_path);
+	}
 
 	// add/commit the new files
 	if (!new_files.empty()) {

debian/changelog

@@ -0,0 +1,12 @@
+git-crypt (0.4.2-1~agwa1) unstable; urgency=low
+
+  * New upstream release.
+  * Various packaging improvements.
+
+ -- Andrew Ayer <agwa@andrewayer.name>  Sat, 31 Jan 2015 19:43:06 -0800
+
+git-crypt (0.3-1) unstable; urgency=low
+
+  * Initial release.
+
+ -- Andrew Ayer <agwa@andrewayer.name>  Sat, 29 Mar 2014 12:38:14 -0700

debian/compat

@@ -0,0 +1 @@
+9

debian/control

@@ -0,0 +1,24 @@
+Source: git-crypt
+Maintainer: Andrew Ayer <agwa@andrewayer.name>
+Section: vcs
+Priority: optional
+Standards-Version: 3.9.4
+Build-Depends: debhelper (>= 9), libssl-dev
+Vcs-Git: https://www.agwa.name/git/git-crypt.git -b debian
+Homepage: https://www.agwa.name/projects/git-crypt
+
+Package: git-crypt
+Architecture: any
+Depends: ${shlibs:Depends}, ${misc:Depends}, git (>= 1.7.2)
+Recommends: gnupg
+Enhances: git
+Description: Transparent file encryption in git
+ git-crypt enables transparent encryption and decryption of files in a
+ git repository.  Files which you choose to protect are encrypted when
+ committed, and decrypted when checked out.  git-crypt lets you freely
+ share a repository containing a mix of public and private content.
+ git-crypt gracefully degrades, so developers without the secret key
+ can still clone and commit to a repository with encrypted files.
+ This lets you store your secret material (such as keys or passwords)
+ in the same repository as your code, without requiring you to lock down
+ your entire repository.

debian/copyright

@@ -0,0 +1,34 @@
+Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: git-crypt
+Source: https://www.agwa.name/projects/git-crypt
+
+Files: *
+Copyright: Copyright 2014 Andrew Ayer <agwa@andrewayer.name>
+License: GPL-3+ with OpenSSL exception
+ git-crypt 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 3 of the License, or
+ (at your option) any later version.
+ .
+ git-crypt 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 git-crypt.  If not, see <http://www.gnu.org/licenses/>.
+ .
+ On Debian systems, the full text of the GNU General Public
+ License version 3 can be found in the file
+ `/usr/share/common-licenses/GPL-3'.
+ .
+ Additional permission under GNU GPL version 3 section 7:
+ .
+ If you modify the Program, or any covered work, by linking or
+ combining it with the OpenSSL project's OpenSSL library (or a
+ modified version of that library), containing parts covered by the
+ terms of the OpenSSL or SSLeay licenses, the licensors of the Program
+ grant you additional permission to convey the resulting work.
+ Corresponding Source for a non-source form of such a combination
+ shall include the source code for the parts of OpenSSL used as well
+ as that of the covered work.

debian/gbp.conf

@@ -0,0 +1,5 @@
+[DEFAULT]
+pristine-tar = True
+pristine-tar-commit = True
+debian-branch = debian
+upstream-tag = %(version)s

debian/git-crypt.docs

@@ -0,0 +1,8 @@
+CONTRIBUTING.md
+NEWS
+NEWS.md
+README
+README.md
+RELEASE_NOTES-0.4.1.md
+RELEASE_NOTES-0.4.md
+THANKS.md

debian/git-crypt.install

@@ -0,0 +1 @@
+git-crypt usr/bin

debian/rules

@@ -0,0 +1,6 @@
+#!/usr/bin/make -f
+
+%:
+	dh  $@
+
+override_dh_auto_install:

debian/source/format

@@ -0,0 +1 @@
+3.0 (quilt)

debian/source/options

@@ -0,0 +1 @@
+single-debian-patch

debian/source/patch-header

@@ -0,0 +1,17 @@
+Subject: Collected Debian patches for git-crypt
+Author: Andrew Ayer <agwa@andrewayer.name>
+
+Since I am also upstream for this package, there will normally not be
+any patches to apply to the upstream source.  However, occasionally
+I'll pull up specific upstream commits prior to making an upstream
+release.  When this happens, this patch will collect all of those
+modifications.
+
+I use Git to maintain both the upstream source and the Debian
+packages, and generating individual patches rather than using git
+cherry-pick takes extra work for no gain.  Since I'm also upstream,
+there's no need to separate the patches for later upstream submission.
+Hence, I take this approach with a unified patch when it's necessary.
+
+For full commit history and separated commits, see the upstream Git
+repository.

git-crypt.cpp

@@ -78,6 +78,11 @@ static void print_usage (std::ostream& out)
 	out << "See 'git-crypt help COMMAND' for more information on a specific command." << std::endl;
 }
 
+static void print_version (std::ostream& out)
+{
+	out << "git-crypt " << VERSION << std::endl;
+}
+
 static bool help_for_command (const char* command, std::ostream& out)
 {
 	if (std::strcmp(command, "init") == 0) {
@@ -121,6 +126,12 @@ static int help (int argc, const char** argv)
 	return 0;
 }
 
+static int version (int argc, const char** argv)
+{
+	print_version(std::cout);
+	return 0;
+}
+
 
 int main (int argc, const char** argv)
 try {
@@ -141,6 +152,9 @@ try {
 		if (std::strcmp(argv[arg_index], "--help") == 0) {
 			print_usage(std::clog);
 			return 0;
+		} else if (std::strcmp(argv[arg_index], "--version") == 0) {
+			print_version(std::clog);
+			return 0;
 		} else if (std::strcmp(argv[arg_index], "--") == 0) {
 			++arg_index;
 			break;
@@ -171,6 +185,9 @@ try {
 		if (std::strcmp(command, "help") == 0) {
 			return help(argc, argv);
 		}
+		if (std::strcmp(command, "version") == 0) {
+			return version(argc, argv);
+		}
 		if (std::strcmp(command, "init") == 0) {
 			return init(argc, argv);
 		}

git-crypt.hpp

@@ -31,6 +31,8 @@
 #ifndef GIT_CRYPT_GIT_CRYPT_HPP
 #define GIT_CRYPT_GIT_CRYPT_HPP
 
+#define VERSION "0.4.2"
+
 extern const char*	argv0;	// initialized in main() to argv[0]
 
 #endif