commit 2d4cce46159eebc2079a13ec38376a5ce08d17e9
Author: yafox <yafox@box>
Date:   Tue Nov 24 19:33:42 2020 +0000

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d416e82
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+pkg/**
+gpg/**
+!gpg/fingerprints.csv
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..bd8c239
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright 2020 "yafox"
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/README b/README
new file mode 100644
index 0000000..c832c44
--- /dev/null
+++ b/README
@@ -0,0 +1,196 @@
+src.sh
+===
+
+usage: `src.sh <package name> [<version> [<archive type>]]`
+
+src.sh pulls source code and checks signatures, checksums, and file sizes.
+it does not apply patches.  this is not an accident.  applying patches was part
+of src.sh's prototype, but patches are more relevant to the configuration and
+build stages of package management than to the source acquisition stage.  sets
+of patches and build environments are tightly coupled by nature.
+
+src.sh is used as part of a source based package manager, but it as meant to be 
+used on its own as well, or as part of any other source based package manager.
+it does what it does, and it does it as simply as possible.  commits may be few
+and far between just because not much may ever need to be done to it.
+
+it supports git repositories and tarballs as sources (or "archive types").  it
+can be extended by adding archive type definition scripts to the `lib/type`
+directory.
+
+it aims to be easy to understand and customise.  the codebase for src.sh is only
+260 SLOC long.  (`sloc.sh` contains the code used to arrive at the SLOC count.)
+
+all package definitions are kept in a separate repository.  this makes it easier
+for users to supply their own package definitions.  to use a package definition
+repository, clone it into `$SRCROOT/pkg`.  to maintain multiple package
+definition repositories, clone them elsewhere and symlink `$SRCROOT/pkg` to
+whichever one should be active at any given time.
+
+files in SRCROOT are assumed to be trustworthy.  no sanitisation is done on the
+`urls`, `sigurls`, etc. files.  do not populate your `pkg` directory with files
+you either have not carefully examined yourself or which are from sources you
+would not let run arbitrary commands on your computer!
+
+
+## installation
+
+clone this repository somewhere, set the SRCROOT variable to point to that
+location, and use `src.sh` directly.  creating a symlink to `src` somewhere
+in PATH is recommended for convenience's sake. (e.g., to call `src.sh` via `src`
+throughout the whole system, `ln -s $SRCROOT/src.sh /bin/src`.)
+
+
+## gpg
+
+PGP signatures are checked if gpg is installed and if signatures are available.
+for the check to pass, the project's maintainer keys must be on the "keyring"
+gpg uses.  to avoid cluttering up the user's personal keyring, src maintains its
+own gpg "home" directory at `$SRCROOT/gpg`.  by default this directory is empty
+except for a CSV containing a mapping of project and maintainer names to PGP
+fingerprints and URLs pointing to the resources which were used to find the
+fingerprint.  this can be used to import keys as needed and to independently
+verify that the correct fingerprint is listed.
+
+for example, importing all the linux-kernel maintainer keys from the keyserver
+hosted by University of Mainz:
+
+```
+cd "$SRCROOT/gpg"
+grep '^linux-kernel,' fingerprints.csv | cut -d, -f3 | while read print; do
+    gpg --homedir=. --keyserver=pgp.uni-mainz.de --recv-keys "$print"
+done
+```
+
+because keyservers can be unreliable, a signed repository containing all the
+public keys referenced in fingerprints.csv can also be found at
+http://git.fuwafuwaqtlkkxwc.onion/yafox/src-keys
+
+
+## defining a package
+
+multiple archive types are supported, but care should be taken to ensure all
+archive types specified in a package produce the same file structure and file
+contents.  if different archive types producing different source code listings
+are desired, split them up into different packages.  a package-version pair
+should always produce the same source code, regardless of how the source code
+was retrieved.
+
+packages are kept in the `pkg` directory. package definitions consist of a
+directory in `pkg` containing a `checks` file and a `urls` file.
+
+for example:
+
+    <some package>/
+     |-- checks
+     |-- urls
+
+the `urls` file is a tab-delimited list associating urls, content types, and
+archive types. each line is formatted as follows:
+
+    <version>	<archive type>	<content type>	<url>
+
+where <version> is the version of the package source code requested, <archive
+type> is a string corresponding to a type definition script in `lib/type`, minus
+the ".sh" file extension, <content type> is "arc" or "sig" (indicating whether
+the url points to the ARChive or the SIGnature for the archive), and <url> is
+the url at which the described content may be retrieved.
+
+optionally, a package may also contain a `defaults.sh` file.  building on the
+first example:
+
+    <some package>/
+     |-- checks
+     |-- defaults.sh
+     |-- urls
+
+
+`defaults.sh` is a small shell script that defines default values for `version`
+and `type`.  if the user does not specify the version and type of archive they
+prefer, whatever values are defined in this file will be used.
+
+for example:
+
+    version="0.0.1"
+    type="git"
+
+the `checks` file is a list of tab-delimited lines in this format:
+
+    <version> <type> <arc or sig> <size> <checksum>
+
+- version: the package version the check is for.
+
+- type: the archive type the check is for.
+
+- arc or sig: literally `arc` or `sig`.  indicates whether this check is for an
+  archive or a signature of an archive.
+
+- size: the expected size of the archive or signature.  signature sizes are
+  always in bytes.  archive sizes depend on the archive type script.  for
+  tarballs, it's bytes.  for git, it's the working directory's "bytes on disk,"
+  or `du -sk` times 1,024.  if the calculated size and the expected size don't
+  match, the check fails.
+
+- checksum: the expected checksum of the archive or signature.  signature
+  checksums are always sha512 checksums.  archive checksums depend on the
+  archive type.  for tarballs, it's just a sha512 checksum.  for git, it's the
+  sha512 checksum of all the sha512 checksums of all the files in the working
+  directory sorted, excluding the `.git` directory.  if the expected checksum
+  does not match the calculated checksum, the check fails.
+
+once a package has been pulled, a few more directories may appear, depending
+on the behavior of the archive type definition scripts in the user's version of
+src.sh. a package whose user has depended on tarballs and git at various times
+may look like this:
+
+    <some package>/
+     |-- git/ # bare git repository; not going to expand this one!
+     |
+     |-- sig/
+     |    |-- 0.01.tar.gz.sig
+     |    |-- 0.02.tar.gz.sig
+     |    |-- 1.00.tar.gz.sig
+     |    |-- 1.01.tar.gz.sig # and so on
+     |
+     |-- tarball/
+     |    |-- <some package>-0.01.tar.gz
+     |    |-- <some package>-0.02.tar.gz
+     |    |-- <some package>-1.00.tar.gz
+     |    |-- <some package>-1.01.tar.gz # and so on
+     |
+     |-- checks
+     |-- defaults.sh
+     |-- urls
+
+
+in this example:
+
+- `git` contains a bare git respository.
+
+- `sig` contains all the signatures downloaded from `tar.gz-sigurls` throughout
+   the package's history and organized by `type` and `version`.
+
+- `tarball` contains all the `tar.gz` files downloaded from `tar.gz-urls`,
+   renamed as `<version>.tar.gz`.
+
+also, the path set in SRCREPO will contain the extracted source code or working
+trees (depending on archive type), one directory per version:
+
+    $SRCREPO/ # like /src or $SRCROOT/code or something
+    |-- <some package>/
+    |    |-- 0.01/
+    |    |-- 0.02/
+    |    |-- 1.00/
+    |    |-- 1.01/ # and so on
+
+## defining archive types
+
+the definitions in `lib/type` are good examples in themselves, but in short, an
+archive definition file consists of a script defining the following functions:
+
+- get_archive
+- sigcheck_archive
+- unpack_archive
+- archive_name
+- archive_size
+- archive_checksum
diff --git a/USAGE b/USAGE
new file mode 100644
index 0000000..e3fe2c5
--- /dev/null
+++ b/USAGE
@@ -0,0 +1,10 @@
+usage: $(basename $0) [options] <package> [<version> [<archive type>]]
+
+default values for <version> and <archive type> are defined in <package>'s
+'defaults.sh' file.  if the <version> given is 'default', the version defined
+in the package's 'defaults.sh' file will be used. 
+
+options:
+    --verbose: show a more verbose exit message.
+    --defaults: print the defaults.sh file for the package and exit.
+    --set-checks: set values in checks file rather than checking against them.
diff --git a/gpg/fingerprints.csv b/gpg/fingerprints.csv
new file mode 100644
index 0000000..082e3e1
--- /dev/null
+++ b/gpg/fingerprints.csv
@@ -0,0 +1,198 @@
+package,owner,fingerprint,citation,key url
+linux-kernel,Linus Torvalds,ABAF11C65A2970B130ABE3C479BE3E4300411886,https://kernel.org/category/signatures.html
+linux-kernel,Greg Kroah-Hartman,647F28654894E3BD457199BE38DBBDC86092693E,https://kernel.org/category/signatures.html
+linux-kernel,Sasha Levin,E27E5D8A3403A2EF66873BBCDEA66FF797772CDC,https://kernel.org/category/signatures.html
+linux-kernel,Ben Hutchings,AC2B29BD34A6AFDDB3F68F35E7BFC8EC95861109,https://kernel.org/category/signatures.html
+patch,Andreas Gruenbacher,259B3792B3D6D319212CC4DCD5BF9FEB0313653A,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=patch&download=1
+patch,Jim Meyering,155D3FC500C834486D1EEA677FD9FCCB000BEEEE,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=patch&download=1
+automake,Karl Berry,17D3311B14BC0F248267BF020716748A30D155AD,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=automake&download=1
+automake,Stefano Lattarini,E1622F96D2BB4E58018EEF9860F906016E407573,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=automake&download=1
+automake,Tom Tromey,E9FE8AE950CB07F5BEB2E805036A75309D33E5B5,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=automake&download=1
+automake,Ralf Wildenhues,357D7084216BD1CF46AFABB232419B785D0CDCFC,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=automake&download=1
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+automake,Benoit Sigoure,C5B91BDAF3A89934720FBAB4C3013AEF00BC3D49,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=automake&download=1
+automake,Jim Meyering,155D3FC500C834486D1EEA677FD9FCCB000BEEEE,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=automake&download=1
+automake,Akim Demaille,7DF84374B1EE1F9764BBE25D0DDCAA3278D5264E,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=automake&download=1
+automake,Bruno Haible,9001B85AF9E1B83DF1BDA942F5BE8B267C6A406D,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=automake&download=1
+automake,Paul Eggert,7E3792A9D8ACF7D633BC1588ED97E90E62AA7E34,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=automake&download=1
+automake,Mathieu Lirzin,F2A38D7EEB2B66405761070D0ADEE10094604D37,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=automake&download=1
+m4,Akim Demaille,7DF84374B1EE1F9764BBE25D0DDCAA3278D5264E,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=m4&download=1
+m4,Paul Eggert,7E3792A9D8ACF7D633BC1588ED97E90E62AA7E34,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=m4&download=1
+m4,Ralf Wildenhues,357D7084216BD1CF46AFABB232419B785D0CDCFC,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=m4&download=1
+m4,Stepan Kasal,10A0114D4D171A8C2913E8CA0C17BCB905909B88,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=m4&download=1
+m4,Eric Blake,2B7C1A53420D4AF3BFF4738BF382AE19F4850180,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=m4&download=1
+m4,Eric Blake,71C2CC22B1C4602927D2F3AAA7A16B4A2527436A,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=m4&download=1
+make,Paul D.Smith,6D4EEB02AD834703510B117680CB727A20C79BB2,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=make&download=1
+make,Boris Kolpackov,F608942F312ED82E5B840407C880290BAE084F1D,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=make&download=1
+patch,Andreas Gruenbacher,259B3792B3D6D319212CC4DCD5BF9FEB0313653A,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=patch&download=1
+patch,Jim Meyering,155D3FC500C834486D1EEA677FD9FCCB000BEEEE,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=patch&download=1
+attr,Andreas Gruenbacher,259B3792B3D6D319212CC4DCD5BF9FEB0313653A,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=attr&download=1
+attr,Brandon Philips,600CD204FBCEA418BD2CA74F154343260542DF34,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=attr&download=1
+attr,Mike Frysinger,B902B5271325F892AC251AD441633B9FE837F581,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=attr&download=1
+bash,Bob Proulx,63B16683841CE3DC25D3C6EB421AFA26387F9A8E,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=bash&download=1
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+gzip,Karl Berry,17D3311B14BC0F248267BF020716748A30D155AD,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=gzip&download=1
+gzip,Paul Eggert,7E3792A9D8ACF7D633BC1588ED97E90E62AA7E34,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=gzip&download=1
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+gzip,Eric Blake,71C2CC22B1C4602927D2F3AAA7A16B4A2527436A,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=gzip&download=1
+libgcrypt,Werner Koch,7B96D396E6471601754BE4DB53B620D01CE0C630,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=libgcrypt&download=1
+libgcrypt,NIIBE Yutaka,031EC2536E580D8EA286A9F22071B08A33BD3F06,https://gnupg.org/signature_key.html
+libtool,Alexandre Oliva,D363BF126B7F7F6FCDCE4F755234845DF2B920F5,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=libtool&download=1
+libtool,Robert Boehne,564A180D1D88DE909F53EC688D4AE004BE425C25,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=libtool&download=1
+libtool,Bruce Korb,D0ACBACAC16365BA0CED71A93230630B93A12DFE,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=libtool&download=1
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+libtool,Jim Meyering,155D3FC500C834486D1EEA677FD9FCCB000BEEEE,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=libtool&download=1
+libtool,Peter O'Gorman,4D671997DD32AE8ED7ED9C7984912AB7DF3B6004,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=libtool&download=1
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+libtool,Eric Blake,2B7C1A53420D4AF3BFF4738BF382AE19F4850180,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=libtool&download=1
+libtool,Eric Blake,71C2CC22B1C4602927D2F3AAA7A16B4A2527436A,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=libtool&download=1
+libtool,Benoit Sigoure,C5B91BDAF3A89934720FBAB4C3013AEF00BC3D49,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=libtool&download=1
+libtool,Pavel Raiskup,4B6DBBF82054C23F20F916DE771FEDD1409580AB,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=libtool&download=1
+bison,Akim Demaille,7DF84374B1EE1F9764BBE25D0DDCAA3278D5264E,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=bison&download=1
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+findutils,Bob Proulx,63B16683841CE3DC25D3C6EB421AFA26387F9A8E,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=findutils&download=1
+findutils,Eric Blake,2B7C1A53420D4AF3BFF4738BF382AE19F4850180,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=findutils&download=1
+findutils,Eric Blake,71C2CC22B1C4602927D2F3AAA7A16B4A2527436A,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=findutils&download=1
+findutils,Bernhard Voelker,A5189DB69C1164D33002936646502EF796917195,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=findutils&download=1
+gdb,Elfyn McBratney,29D591BB87487CC9650F31FE68880C2A456548B4,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=gdb&download=1
+gdb,Sergio DuriganJunior,237A54B1028728BF00EF31F4D0EB762865FC5E36,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=gdb&download=1
+diffutils,Paul Eggert,7E3792A9D8ACF7D633BC1588ED97E90E62AA7E34,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=diffutils&download=1
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+diffutils,Bruno Haible,9001B85AF9E1B83DF1BDA942F5BE8B267C6A406D,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=diffutils&download=1
+diffutils,Jim Meyering,155D3FC500C834486D1EEA677FD9FCCB000BEEEE,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=diffutils&download=1
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+diffutils,Eric Blake,71C2CC22B1C4602927D2F3AAA7A16B4A2527436A,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=diffutils&download=1
+diffutils,Bob Proulx,63B16683841CE3DC25D3C6EB421AFA26387F9A8E,https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=diffutils&download=1
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+libseccomp,Paul Moore,7100AADFAE6E6E940D2E0AD655E45A5AE8CA7C8A,https://github.com/seccomp/libseccomp,https://keys.openpgp.org/vks/v1/by-fingerprint/7100AADFAE6E6E940D2E0AD655E45A5AE8CA7C8A
+libseccomp,Tom Hromatka,47A68FCE37C7D7024FD65E11356CE62C2B524099,https://github.com/seccomp/libseccomp,https://keys.openpgp.org/vks/v1/by-fingerprint/47A68FCE37C7D7024FD65E11356CE62C2B524099
+dbus,Simon McVittie,DA98F25C0871C49A59EAFF2C4DE8FF2A63C7CC90,https://lists.debian.org/debian-user/2011/03/msg00439.html,https://d.peegeepee.com/DA98F25C0871C49A59EAFF2C4DE8FF2A63C7CC90.asc
+autoconf-archive,Peter Simons,1A4F63A13A4649B632F65EE141BC28FE99089D72,https://github.com/autoconf-archive/autoconf-archive,https://d.peegeepee.com/1A4F63A13A4649B632F65EE141BC28FE99089D72.asc
+gstreamer,Tim-Phillipp Mller,D637032E45B8C6585B9456565D2EEE6F6F349D7CA,https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=gst-rtsp-server,https://d.peegeepee.com/D637032E45B8C6585B9456565D2EEE6F6F349D7C.asc
+alsa-lib,ALSA Release Team (Package Signing Key v1),F04DF50737AC1A884C4B3D718380596DA6E59C91,https://www.alsa-project.org/wiki/Download,https://www.alsa-project.org/files/pub/gpg-release-key-v1.txt
+libwpe,Adrian Perez de Castro,5AA3BC334FD7E3369E7C77B291C559DBE4C9123B,https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=libwpe,https://d.peegeepee.com/5AA3BC334FD7E3369E7C77B291C559DBE4C9123B.asc
diff --git a/lib/get_file.sh b/lib/get_file.sh
new file mode 100644
index 0000000..4d21edb
--- /dev/null
+++ b/lib/get_file.sh
@@ -0,0 +1,28 @@
+# the same logic applies whether downloading a tarball or a signature file.
+# don't accept anything but the expected number of bytes and check the checksum.
+get_file() {
+    local dest="$1"
+    local url="$2"
+    local size="$3"
+
+    # being explicit about the size of the file allows protection against DoS
+    # attacks where the attacker sends an infinite stream of bytes.  it may also
+    # make finding hash collisions against a particular hash impossible, since
+    # it may be that no collision using an input equal to the given size exists.
+    [ ! "$size" ] || sizeopt="-r 0-$size"
+    curl $sizeopt --compressed -C - -L -o "$dest" "$url"
+
+    return $?
+}
+
+file_size() {
+    wc -c "$1" | cut -d' ' -f1
+}
+
+file_checksum() {
+    sha512sum "$1" | cut -d' ' -f1
+}
+
+file_name() {
+    echo "$1"
+}
diff --git a/lib/log.sh b/lib/log.sh
new file mode 100644
index 0000000..2b09101
--- /dev/null
+++ b/lib/log.sh
@@ -0,0 +1,16 @@
+# if _colors is not already set, if this is running on an interactive
+# terminal (as opposed to in a script), if tput is installed, and if tput
+# knows some color codes, then set _colors to 'yes'.
+{  [ -z "$_colors" ] \
+&& [ -t 1 ] \
+&& [ "$(tput colors 2>/dev/null || echo 0)" -ge 8 ] \
+&& _colors="yes"; } || true # suppress error codes
+
+_clr="$({ [ "$_colors" = 'yes' ] && tput sgr0; } || echo '')"
+_blu="$({ [ "$_colors" = 'yes' ] && tput setaf 6; } || echo '')"
+_ylw="$({ [ "$_colors" = 'yes' ] && tput setaf 3; } || echo '')"
+_red="$({ [ "$_colors" = 'yes' ] && tput setaf 1; } || echo '')"
+
+log() { [ "$verbose" != 'yes' ] || echo "$_blu[LOG]$_clr $@"; }
+wrn() { echo "$_ylw[WRN]$_clr $@" >&2; }
+err() { echo "$_red[ERR]$_clr $@" >&2; exit 1; }
diff --git a/lib/type/git.sh b/lib/type/git.sh
new file mode 100755
index 0000000..99e2a89
--- /dev/null
+++ b/lib/type/git.sh
@@ -0,0 +1,43 @@
+get_archive() {
+    local gitdest="$1"
+    local url="$2"
+
+    # would be great if there were a way to restrict size here.
+    if [ -d "$gitdest" ]; then
+        (cd "$gitdest" && git fetch --all)
+    else
+        git clone --mirror "$url" "$gitdest"
+    fi
+}
+
+archive_name() {
+    echo "$SRCROOT/pkg/$pkgname/git"
+}
+
+archive_size() {
+    # don't do this!  different sizes on different filesystem types.
+    ##expr $(du -sk $1 | cut -f1) \* 1024
+    
+    cd "$1"
+    git count-objects -vH | grep size-pack | cut -d': ' -f2
+    cd - >/dev/null
+}
+
+archive_checksum() {
+    cd "$1"
+    find . -type f ! -path "**/.git/**" ! -name ".git" \
+           | sort \
+           | xargs sha512sum \
+           | cut -d' ' -f1 \
+           | sha512sum \
+           | cut -d' ' -f1
+    cd - >/dev/null
+}
+
+unpack_archive() {
+    cd "$1"
+    git worktree add -f "$2" "$version"
+    cd - >/dev/null
+}
+
+sigcheck_archive() { return 0; }
diff --git a/lib/type/kernel-gz.sh b/lib/type/kernel-gz.sh
new file mode 120000
index 0000000..6289e60
--- /dev/null
+++ b/lib/type/kernel-gz.sh
@@ -0,0 +1 @@
+kernel-tarball.sh
\ No newline at end of file
diff --git a/lib/type/kernel-tarball.sh b/lib/type/kernel-tarball.sh
new file mode 100755
index 0000000..882ce0d
--- /dev/null
+++ b/lib/type/kernel-tarball.sh
@@ -0,0 +1,65 @@
+# for tarballs that use kernel.org's style of signature, where the release
+# signature is made against the uncompressed tarball.
+get_archive() {
+    [ -d "$pkg/tarball" ] || mkdir -p "$pkg/tarball"
+
+    local tarball="$1"
+    local ext="$(echo "$type" | cut -d- -f2)"
+    get_file "$tarball" "$url" || return 1
+
+    log "decompressing tarball..."
+
+    case "$ext" in
+        xz) unxz -k "$tarball" ;;
+        gz) gunzip -k "$tarball" ;;
+        *) err "unrecognized extension: $ext" ;;
+    esac
+
+    return $?
+}
+
+sigcheck_archive() {
+    local ext="$(echo "$type" | cut -d- -f2)"
+    local tarball="${1%.$ext}"
+    gpg --homedir="$SRCROOT/gpg" --verify "$2" "$tarball" \
+    || err "$2 does not contain a valid signature for $tarball"
+}
+
+unpack_archive() {
+    local ext="$(echo "$type" | cut -d- -f2)"
+    local tarball="${1%.$ext}"
+    local arcdest="$2"
+
+    log "extracting tarball..."
+
+    # extract the tarball into a temporary directory first, then move either it
+    # or its contents, if it contained a single directory, to $pkgdest
+    tempdir="$(mktemp -d)"
+    tar -xf "$tarball" -C $tempdir
+    contents="$(ls "$tempdir")"
+
+    if [ "$(echo "$contents" | wc -l)" -gt 1 ]; then
+        mkdir -p "$arcdest"
+        contents="."
+    else
+        mkdir -p "$(dirname $arcdest)"
+    fi
+    mv "$tempdir/$contents" "$arcdest"
+    rm -r "$tempdir"
+    rm "$tarball" # remove the uncompressed tarball
+
+    return 0
+}
+
+archive_name() {
+    local ext="$(echo "$type" | cut -d- -f2)"
+    echo "$pkg/tarball/$pkgname-$version.tar.$ext"
+}
+
+archive_size() {
+    file_size $@
+}
+
+archive_checksum() {
+    file_checksum $@
+}
diff --git a/lib/type/kernel-xz.sh b/lib/type/kernel-xz.sh
new file mode 120000
index 0000000..6289e60
--- /dev/null
+++ b/lib/type/kernel-xz.sh
@@ -0,0 +1 @@
+kernel-tarball.sh
\ No newline at end of file
diff --git a/lib/type/raw.sh b/lib/type/raw.sh
new file mode 100755
index 0000000..da9afbd
--- /dev/null
+++ b/lib/type/raw.sh
@@ -0,0 +1,30 @@
+get_archive() {
+    [ -d "$pkg/raw" ] || mkdir -p "$pkg/raw"
+
+    get_file "$1" "$2" "$3" || return 1
+
+    return 0
+}
+
+sigcheck_archive() {
+    gpg --homedir="$SRCROOT/gpg" --verify "$2" "$1" \
+    || err "$2 does not contain a valid signature for $1"
+}
+
+unpack_archive() {
+    [ -d "$2" ] || mkdir -p "$2"
+    mv "$1" "$2/$pkgname"
+    rmdir "$pkg/raw" 2>/dev/null || true
+}
+
+archive_name() {
+    echo "$pkg/raw/$pkgname-$version"
+}
+
+archive_size() {
+    file_size $@
+}
+
+archive_checksum() {
+    file_checksum $@
+}
diff --git a/lib/type/tar.bz2.sh b/lib/type/tar.bz2.sh
new file mode 120000
index 0000000..c036547
--- /dev/null
+++ b/lib/type/tar.bz2.sh
@@ -0,0 +1 @@
+tarball.sh
\ No newline at end of file
diff --git a/lib/type/tar.gz.sh b/lib/type/tar.gz.sh
new file mode 120000
index 0000000..c036547
--- /dev/null
+++ b/lib/type/tar.gz.sh
@@ -0,0 +1 @@
+tarball.sh
\ No newline at end of file
diff --git a/lib/type/tar.xz.sh b/lib/type/tar.xz.sh
new file mode 120000
index 0000000..c036547
--- /dev/null
+++ b/lib/type/tar.xz.sh
@@ -0,0 +1 @@
+tarball.sh
\ No newline at end of file
diff --git a/lib/type/tarball.sh b/lib/type/tarball.sh
new file mode 100755
index 0000000..cef4b30
--- /dev/null
+++ b/lib/type/tarball.sh
@@ -0,0 +1,46 @@
+get_archive() {
+    [ -d "$pkg/tarball" ] || mkdir -p "$pkg/tarball"
+
+    get_file "$1" "$url" "$3"
+
+    return $?
+}
+
+unpack_archive() {
+    log "extracting tarball..."
+
+    # extract the tarball into a temporary directory first, then move either it
+    # or its contents, if it contained a single directory, to $pkgdest
+    tempdir="$(mktemp -d)"
+    tar -xf "$1" -C $tempdir
+    contents="$(ls "$tempdir")"
+
+    if [ "$(echo "$contents" | wc -l)" -gt 1 ]; then
+        mkdir -p "$2"
+        contents="."
+    else
+        mkdir -p "$(dirname "$2")"
+    fi
+
+    mv "$tempdir/$contents" "$2"
+    rm -r "$tempdir"
+
+    return 0
+}
+
+sigcheck_archive() {
+    gpg --homedir="$SRCROOT/gpg" --verify "$2" "$1" \
+    || err "$2 does not contain a valid signature for $1"
+}
+
+archive_name() {
+    echo "$pkg/tarball/$pkgname-$version.$type"
+}
+
+archive_size() {
+    file_size $@
+}
+
+archive_checksum() {
+    file_checksum $@
+}
diff --git a/lib/type/tgz.sh b/lib/type/tgz.sh
new file mode 120000
index 0000000..c036547
--- /dev/null
+++ b/lib/type/tgz.sh
@@ -0,0 +1 @@
+tarball.sh
\ No newline at end of file
diff --git a/makefile b/makefile
new file mode 100644
index 0000000..c76ac13
--- /dev/null
+++ b/makefile
@@ -0,0 +1,22 @@
+SRCDIR = $(dir $(realpath $(firstword $(MAKEFILE_LIST))))
+PREFIX ?= /usr
+DESTDIR ?= $(PREFIX)/bin
+SRCREPO ?= $(PREFIX)/var/src
+SRCROOT ?= $(PREFIX)/share/src
+GITBASE ?= $(shell realpath $(shell git config --get remote.origin.url) | rev \
+           | cut -d/ -f2- | rev)
+
+.PHONY: install uninstall lix-os-pkg
+
+lix-os-pkgs:
+	git clone $(GITBASE)/src-lix-os-pkgs pkg
+
+install:
+	mkdir -p $(SRCREPO)
+	ln -sf $(SRCDIR) $(SRCROOT)
+	ln -sf $(SRCROOT)/src.sh $(DESTDIR)/src
+
+uninstall:
+	rm $(DESTDIR)/src
+	rm $(SRCROOT)
+	rm -fr $(SRCREPO)
diff --git a/sloc.sh b/sloc.sh
new file mode 100755
index 0000000..1ea7b20
--- /dev/null
+++ b/sloc.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# find all *.sh files not under `pkg` that are not symbolic links, strip all
+# trailing whitespace, then all leading whitespace, then all lines starting
+# with '#', then all empty lines. then count the remaining lines.
+
+find . -name "*.sh" ! -path "**/pkg/**" ! -type l \
+| xargs sed 's/[[:space:]]*$//g; s/^[[:space:]]*//g; s/^#.*$//g; /^$/d' \
+| wc -l - \
+| cut -d' ' -f1
+
+# note that this script's ELOC is also included in the count.
diff --git a/src.sh b/src.sh
new file mode 100755
index 0000000..c40b3c8
--- /dev/null
+++ b/src.sh
@@ -0,0 +1,126 @@
+#!/bin/sh -e
+
+export SRCROOT="$(dirname "$(readlink -f "$0")")"
+export PREFIX="${PREFIX:-${0%/bin/src}}"
+export SRCREPO="${SRCREPO:-$PREFIX/var/src}"
+
+while [ "${1#-}" != "$1" ]; do
+    case "$1" in
+        -e|--exists) exists='yes' ;;
+        -v|--verbose) verbose='yes' ;;
+        -d|--defaults) defaults='yes' ;;
+        -s|--set-checks) setchecks='yes' ;;
+    esac
+    shift
+done
+
+[ "$1" ] || { eval "echo \"$(cat $SRCROOT/USAGE)\"" && exit 0; }
+
+. "$SRCROOT/lib/log.sh"
+. "$SRCROOT/lib/get_file.sh"
+
+[ -d "$SRCREPO" ] || err "$SRCREPO is not a directory!"
+
+export pkgname="$1"
+
+pkg="$SRCROOT/pkg/$pkgname"
+[ -e "$pkg/checks" ] || [ "$setchecks" ] \
+|| err "'checks' file missing for $pkgname!"
+
+[ ! -e "$pkg/defaults.sh" ] || . "$pkg/defaults.sh" 
+[ "$2" = "default" ] || version="${2:-$version}"
+export version
+export type="${3:-$type}"
+
+if [ "$defaults" ]; then
+    cat "$pkg/defaults.sh"
+    exit 0
+fi
+
+[ "$version" ] && [ "$type" ] || err "type and version could not be determined."
+
+# load the archive type's 'get_archive' function
+. "$SRCROOT/lib/type/$type.sh"
+
+arcdest="$SRCREPO/$pkgname/$version"
+sigdest="$pkg/sig/$pkgname-$version.$type.sig"
+
+if [ "$exists" ]; then
+    [ -e "$arcdest" ] && exit 0 || exit 1
+fi
+
+[ ! -e "$arcdest" ] || err "$arcdest exists! skipping pull." \
+
+# if the package is a symlink to a sibling directory, make a corresponding
+# symlink in SRCREPO and bail to avoid duplicating source code.
+ linktarget="$(readlink "$SRCROOT/pkg/$1" 2> /dev/null)" \
+  && [ "${linktarget#*/}" = "$linktarget" ] \
+  && ln -sf "$SRCREPO/$linktarget" "$SRCREPO/$pkgname" \
+  && log "symlinked $SRCREPO/$pkgname to $SRCREPO/$linktarget." \
+ || true # force evaluation to true since "sh -e" exits on non-zero exit codes.
+
+# if a symlink was created, do the existence check again.  act like the code
+# was just pulled if the symlink made the sought version available at $arcdest.
+[ ! "$linktarget" ] \
+|| [ ! -e "$arcdest" ] \
+|| { echo "$arcdest" && exit 0; }
+
+# otherwise, let's continue with the business of making the remote requests.
+tryurls() {
+    abbr="$(echo $1 | cut -c1-3)" # 'sig' or 'arc'
+    dest="$2"
+    urlsfile="$(eval "echo \"$(cat "$pkg/urls")\"")"
+    urls="$(echo "$urlsfile" | awk "/^$version\t$type\t$abbr\t/")"
+    [ -n "$urls" ] || return 0
+
+    check="$(eval "echo \"$(awk "/$version\t$type\t$abbr\t/" "$pkg/checks")\"")"
+    if [ ! "$check" ] && [ ! "$setchecks" ]; then
+        err "no '$abbr' check for $pkgname $version."
+    fi
+
+    size="$(echo "$check" | cut -f4)"
+    sum="$(echo "$check" | cut -f5)"
+
+    log "grabbing $pkgname $version $type $1..."
+    mkdir -p "$(dirname "$dest")"
+
+    echo "$urls" | while read line; do
+        url="$(echo "$line" | cut -f4)"
+        log "trying $url"
+
+        get_$3 "$dest" "$url" "$size" && break || continue
+    done
+    [ -e "$dest" ] || err "failed to get $pkgname $version $type $1!"
+
+    log "calculating size and checksum..."
+    truesize="$(${3}_size "$dest")"
+    truesum="$(${3}_checksum "$dest")"
+    
+    if [ ! "$setchecks" ]; then
+        [ "$truesize" = "$size" ] || err "expected size $size, got $truesize."
+        [ "$truesum" = "$sum" ] || err "expected checksum $sum, got $truesum."
+    else
+        log "setting checks for $name $version"
+        printf "$version\t$type\t$abbr\t$truesize\t$truesum\n" >> $pkg/checks
+        [ ! "$check" ] || sed -i "/^$check\$/d" "$pkg/checks" || true
+    fi
+}
+
+arcname="$(archive_name)"
+tryurls "signature" "$sigdest" "file"
+tryurls "archive" "$arcname" "archive"
+
+if [ -f "$sigdest" ]; then
+    if (which gpg 1>&2 2>/dev/null); then
+        log "checking signature..."
+        sigcheck_archive "$arcname" "$sigdest"
+    else
+        wrn "signature available but gpg not found! skipping 'sig' check."
+    fi
+fi
+
+unpack_archive "$arcname" "$arcdest"
+
+[ "$verbose" ] \
+&& log "$pkgname $version source code extracted to $arcdest" \
+|| echo "$arcdest"