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|
{ pkgs, lib, ... }:
let
host = "git.oxapentane.com";
gitHome = "/var/lib/git";
cgitPort = 8080;
defaultBranch = "main";
mkCreateRepoCommand =
{
command,
visibility,
}:
pkgs.writeShellApplication {
name = command;
runtimeInputs = [
pkgs.coreutils
pkgs.git
pkgs.gnugrep
];
text = ''
set -eu
if [ "$#" -ne 1 ]; then
printf 'usage: ${command} NAME\n' >&2
exit 2
fi
name=$1
# Accept either "foo" or "foo.git".
case "$name" in
*.git)
name="''${name%.git}"
;;
esac
# Deliberately only allow a single path component.
# This excludes traversal, slashes, spaces and shell metacharacters.
if ! printf '%s\n' "$name" \
| grep -Eq '^[A-Za-z0-9][A-Za-z0-9._-]*$'
then
printf '%s\n' \
'invalid repository name: use letters, digits, ".", "_" and "-"' \
>&2
exit 2
fi
base=${lib.escapeShellArg "${gitHome}/${visibility}"}
repo="$base/$name.git"
umask 0027
# mkdir is the existence check: never silently reinitialize a repo.
if ! mkdir -- "$repo" 2>/dev/null; then
printf 'repository already exists or cannot be created: %s\n' \
"$name.git" >&2
exit 1
fi
if ! git init \
--bare \
--initial-branch=${lib.escapeShellArg defaultBranch} \
"$repo" \
>/dev/null
then
printf 'failed to initialize repository: %s\n' "$name.git" >&2
exit 1
fi
# Avoid Git's default "Unnamed repository..." text appearing in cgit.
: > "$repo/description"
# This is the only successful stdout output, making $() safe.
printf '%s\n' "git@${host}:${visibility}/$name.git"
'';
};
createPrivate = mkCreateRepoCommand {
command = "create";
visibility = "private";
};
createPublic = mkCreateRepoCommand {
command = "create-pub";
visibility = "public";
};
noInteractiveLogin = pkgs.writeShellScript "no-interactive-login" ''
printf '%s\n' "Interactive shell access is disabled." >&2
exit 128
'';
restrictedGitShell =
(pkgs.writeShellApplication {
name = "restricted-git-shell";
text = ''
umask 0027
exec ${pkgs.git}/bin/git-shell "$@"
'';
}).overrideAttrs (old: {
passthru = (old.passthru or { }) // {
shellPath = "/bin/restricted-git-shell";
};
});
in
{
# public repos in cgit
services.cgit."${host}" = {
enable = true;
user = "cgit";
group = "cgit";
scanPath = "${gitHome}/public";
gitHttpBackend = {
enable = true;
checkExportOkFiles = false; # /public is unconditionally public anyway...
};
settings = {
root-title = "0xa's compilable shitposts";
root-desc = "Public directory of my finest spaghetti";
remove-suffix = true;
clone-url =
"https://${host}/$CGIT_REPO_URL.git "
+ "git@${host}:public/$CGIT_REPO_URL.git";
enable-http-clone = false;
enable-filter-overrides = false;
enable-git-config = false;
enable-http-serving = false;
max-blob-size = 2048;
noplainemail = true;
snapshots = "";
};
nginx = {
virtualHost = host;
location = "/";
};
};
# just bind to proxy interface, everything's handeled by caddy
services.nginx.virtualHosts.${host}.listen = [
{
addr = "10.89.88.19";
port = cgitPort;
}
];
# private - bare repos behind separate user
users.groups.git = {};
users.users.git = {
isSystemUser = true;
group = "git";
home = gitHome;
createHome = false;
shell = restrictedGitShell;
hashedPassword = "!";
openssh.authorizedKeys.keys = [
"ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAXrwZsBChUhVuF5gFEfj8GwQlnrqEttAytS5jVCfuE4 0xa@frituurpan"
];
};
# enable and cofigure ssh
services.openssh = {
enable = true;
extraConfig = ''
Match User git
AuthenticationMethods publickey
PasswordAuthentication no
KbdInteractiveAuthentication no
DisableForwarding yes
PermitTTY no
PermitUserRC no
'';
};
# ensure directories and rights
systemd.tmpfiles.rules = [
"d ${gitHome} 0711 git git -"
"d ${gitHome}/public 2750 git cgit -"
"d ${gitHome}/private 0711 git git -"
"d ${gitHome}/git-shell-commands 0700 git git -"
"L+ ${gitHome}/git-shell-commands/create - - - - ${createPrivate}/bin/create"
"L+ ${gitHome}/git-shell-commands/create-pub - - - - ${createPublic}/bin/create-pub"
"L+ ${gitHome}/git-shell-commands/no-interactive-login - - - - ${noInteractiveLogin}"
];
# dubious ownership error
systemd.services."fcgiwrap-cgit-${host}".environment = {
GIT_CONFIG_COUNT = "1";
GIT_CONFIG_KEY_0 = "safe.directory";
GIT_CONFIG_VALUE_0 = "${gitHome}/public/*";
};
}
|
