diff options
| -rw-r--r-- | modules/tv/git/cgit.nix | 11 | ||||
| -rw-r--r-- | modules/tv/git/config.nix | 272 | ||||
| -rw-r--r-- | modules/tv/git/default.nix | 374 | ||||
| -rw-r--r-- | modules/tv/git/options.nix | 93 | ||||
| -rw-r--r-- | modules/tv/git/public.nix | 3 |
5 files changed, 377 insertions, 376 deletions
diff --git a/modules/tv/git/cgit.nix b/modules/tv/git/cgit.nix index fd87b9081..826ee7f27 100644 --- a/modules/tv/git/cgit.nix +++ b/modules/tv/git/cgit.nix @@ -1,23 +1,15 @@ -{ config, lib, pkgs, ... }: +{ cfg, config, lib, pkgs, ... }: let inherit (builtins) attrValues filter getAttr; inherit (lib) concatMapStringsSep mkIf optionalString; - cfg = config.services.git; - location = lib.nameValuePair; # TODO this is also in modules/wu/default.nix isPublicRepo = getAttr "public"; # TODO this is also in ./default.nix in { - imports = [ - ../../tv/nginx - ]; - - config = mkIf cfg.cgit { - users.extraUsers = lib.singleton { name = "fcgiwrap"; uid = 2851179180; # genid fcgiwrap @@ -93,5 +85,4 @@ in '') ]; }; - }; } diff --git a/modules/tv/git/config.nix b/modules/tv/git/config.nix new file mode 100644 index 000000000..4f44c3839 --- /dev/null +++ b/modules/tv/git/config.nix @@ -0,0 +1,272 @@ +arg@{ cfg, lib, pkgs, ... }: + +let + inherit (builtins) head tail typeOf; + inherit (lib) + attrValues concatStringsSep concatMapStringsSep escapeShellArg filter + getAttr hasAttr hasPrefix lessThan makeSearchPath mapAttrsToList + optional optionalString removePrefix singleton sort unique; + inherit (pkgs) linkFarm writeScript; + + ensureList = x: + if typeOf x == "list" then x else [x]; + + getName = x: x.name; + + isPublicRepo = getAttr "public"; # TODO this is also in ./cgit.nix + + makeAuthorizedKey = git-ssh-command: user@{ name, pubkey }: + # TODO assert name + # TODO assert pubkey + let + options = concatStringsSep "," [ + ''command="exec ${git-ssh-command} ${name}"'' + "no-agent-forwarding" + "no-port-forwarding" + "no-pty" + "no-X11-forwarding" + ]; + in + "${options} ${pubkey}"; + + # [case-pattern] -> shell-script + # Create a shell script that succeeds (exit 0) when all its arguments + # match the case patterns (in the given order). + makeAuthorizeScript = + let + # TODO escape + to-pattern = x: concatStringsSep "|" (ensureList x); + go = i: ps: + if ps == [] + then "exit 0" + else '' + case ''$${toString i} in ${to-pattern (head ps)}) + ${go (i + 1) (tail ps)} + esac''; + in + patterns: '' + #! /bin/sh + set -euf + ${concatStringsSep "\n" (map (go 1) patterns)} + exit -1 + ''; + + reponames = rules: sort lessThan (unique (map (x: x.repo.name) rules)); + + # TODO makeGitHooks that uses runCommand instead of scriptFarm? + scriptFarm = + farm-name: scripts: + let + makeScript = script-name: script-string: { + name = script-name; + path = writeScript "${farm-name}_${script-name}" script-string; + }; + in + linkFarm farm-name (mapAttrsToList makeScript scripts); + + + git-ssh-command = writeScript "git-ssh-command" '' + #! /bin/sh + set -euf + + PATH=${makeSearchPath "bin" (with pkgs; [ + coreutils + git + gnugrep + gnused + systemd + ])} + + abort() { + echo "error: $1" >&2 + systemd-cat -p err -t git echo "error: $1" + exit -1 + } + + GIT_SSH_USER=$1 + + systemd-cat -p info -t git echo \ + "authorizing $GIT_SSH_USER $SSH_CONNECTION $SSH_ORIGINAL_COMMAND" + + # References: The Base Definitions volume of + # POSIX.1‐2013, Section 3.278, Portable Filename Character Set + portable_filename_bre="^[A-Za-z0-9._-]\\+$" + + command=$(echo "$SSH_ORIGINAL_COMMAND" \ + | sed -n 's/^\([^ ]*\) '"'"'\(.*\)'"'"'/\1/p' \ + | grep "$portable_filename_bre" \ + || abort 'cannot read command') + + GIT_SSH_REPO=$(echo "$SSH_ORIGINAL_COMMAND" \ + | sed -n 's/^\([^ ]*\) '"'"'\(.*\)'"'"'/\2/p' \ + | grep "$portable_filename_bre" \ + || abort 'cannot read reponame') + + ${cfg.etcDir}/authorize-command \ + "$GIT_SSH_USER" "$GIT_SSH_REPO" "$command" \ + || abort 'access denied' + + repodir=${escapeShellArg cfg.dataDir}/$GIT_SSH_REPO + + systemd-cat -p info -t git \ + echo "authorized exec $command $repodir" + + export GIT_SSH_USER + export GIT_SSH_REPO + exec "$command" "$repodir" + ''; + + init-script = writeScript "git-init" '' + #! /bin/sh + set -euf + + PATH=${makeSearchPath "bin" (with pkgs; [ + coreutils + findutils + gawk + git + gnugrep + gnused + ])} + + dataDir=${escapeShellArg cfg.dataDir} + mkdir -p "$dataDir" + + # Notice how the presence of hooks symlinks determine whether + # we manage a repositry or not. + + # Make sure that no existing repository has hooks. We can delete + # symlinks because we assume we created them. + find "$dataDir" -mindepth 2 -maxdepth 2 -name hooks -type l -delete + bad_hooks=$(find "$dataDir" -mindepth 2 -maxdepth 2 -name hooks) + if echo "$bad_hooks" | grep -q .; then + printf 'error: unknown hooks:\n%s\n' \ + "$(echo "$bad_hooks" | sed 's/^/ /')" \ + >&2 + exit -1 + fi + + # Initialize repositories. + ${concatMapStringsSep "\n" (repo: + let + hooks = scriptFarm "git-hooks" (makeHooks repo); + in + '' + reponame=${escapeShellArg repo.name} + repodir=$dataDir/$reponame + mode=${toString (if isPublicRepo repo then 0711 else 0700)} + if ! test -d "$repodir"; then + mkdir -m "$mode" "$repodir" + git init --bare --template=/var/empty "$repodir" + chown -R git:nogroup "$repodir" + fi + ln -s ${hooks} "$repodir/hooks" + '' + ) (attrValues cfg.repos)} + + # Warn about repositories that exist but aren't mentioned in the + # current configuration (and thus didn't receive a hooks symlink). + unknown_repos=$(find "$dataDir" -mindepth 1 -maxdepth 1 \ + -type d \! -exec test -e '{}/hooks' \; -print) + if echo "$unknown_repos" | grep -q .; then + printf 'warning: stale repositories:\n%s\n' \ + "$(echo "$unknown_repos" | sed 's/^/ /')" \ + >&2 + fi + ''; + + makeHooks = repo: removeAttrs repo.hooks [ "pre-receive" ] // { + pre-receive = '' + #! /bin/sh + set -euf + + PATH=${makeSearchPath "bin" (with pkgs; [ + coreutils # env + git + systemd + ])} + + accept() { + #systemd-cat -p info -t git echo "authorized $1" + accept_string="''${accept_string+$accept_string + }authorized $1" + } + reject() { + #systemd-cat -p err -t git echo "denied $1" + #echo 'access denied' >&2 + #exit_code=-1 + reject_string="''${reject_string+$reject_string + }access denied: $1" + } + + empty=0000000000000000000000000000000000000000 + + accept_string= + reject_string= + while read oldrev newrev ref; do + + if [ $oldrev = $empty ]; then + receive_mode=create + elif [ $newrev = $empty ]; then + receive_mode=delete + elif [ "$(git merge-base $oldrev $newrev)" = $oldrev ]; then + receive_mode=fast-forward + else + receive_mode=non-fast-forward + fi + + if ${cfg.etcDir}/authorize-push \ + "$GIT_SSH_USER" "$GIT_SSH_REPO" "$ref" "$receive_mode"; then + accept "$receive_mode $ref" + else + reject "$receive_mode $ref" + fi + done + + if [ -n "$reject_string" ]; then + systemd-cat -p err -t git echo "$reject_string" + exit -1 + fi + + systemd-cat -p info -t git echo "$accept_string" + + ${optionalString (hasAttr "post-receive" repo.hooks) '' + # custom post-receive hook + ${repo.hooks.post-receive}''} + ''; + }; + + etc-base = + assert (hasPrefix "/etc/" cfg.etcDir); + removePrefix "/etc/" cfg.etcDir; +in + +{ + system.activationScripts.git-init = "${init-script}"; + + # TODO maybe put all scripts here and then use PATH? + environment.etc."${etc-base}".source = + scriptFarm "git-ssh-authorizers" { + authorize-command = makeAuthorizeScript (map ({ repo, user, perm }: [ + (map getName (ensureList user)) + (map getName (ensureList repo)) + (map getName perm.allow-commands) + ]) cfg.rules); + + authorize-push = makeAuthorizeScript (map ({ repo, user, perm }: [ + (map getName (ensureList user)) + (map getName (ensureList repo)) + (ensureList perm.allow-receive-ref) + (map getName perm.allow-receive-modes) + ]) (filter (x: hasAttr "allow-receive-ref" x.perm) cfg.rules)); + }; + + users.extraUsers = singleton { + description = "Git repository hosting user"; + name = "git"; + shell = "/bin/sh"; + openssh.authorizedKeys.keys = + mapAttrsToList (_: makeAuthorizedKey git-ssh-command) cfg.users; + uid = 112606723; # genid git + }; +} diff --git a/modules/tv/git/default.nix b/modules/tv/git/default.nix index edaa80f41..17bc3738b 100644 --- a/modules/tv/git/default.nix +++ b/modules/tv/git/default.nix @@ -1,76 +1,10 @@ -{ config, lib, pkgs, ... }: +arg@{ config, pkgs, lib, ... }: let - inherit (builtins) - attrNames attrValues concatLists getAttr filter hasAttr head lessThan - removeAttrs tail toJSON typeOf; - inherit (lib) - concatMapStringsSep concatStringsSep escapeShellArg hasPrefix - literalExample makeSearchPath mapAttrsToList mkIf mkOption optionalString - removePrefix singleton sort types unique; - inherit (pkgs) linkFarm writeScript writeText; + inherit (lib) mkIf mkMerge; - - ensureList = x: - if typeOf x == "list" then x else [x]; - - getName = x: x.name; - - isPublicRepo = getAttr "public"; # TODO this is also in ./cgit.nix - - makeAuthorizedKey = git-ssh-command: user@{ name, pubkey }: - # TODO assert name - # TODO assert pubkey - let - options = concatStringsSep "," [ - ''command="exec ${git-ssh-command} ${name}"'' - "no-agent-forwarding" - "no-port-forwarding" - "no-pty" - "no-X11-forwarding" - ]; - in - "${options} ${pubkey}"; - - # [case-pattern] -> shell-script - # Create a shell script that succeeds (exit 0) when all its arguments - # match the case patterns (in the given order). - makeAuthorizeScript = - let - # TODO escape - to-pattern = x: concatStringsSep "|" (ensureList x); - go = i: ps: - if ps == [] - then "exit 0" - else '' - case ''$${toString i} in ${to-pattern (head ps)}) - ${go (i + 1) (tail ps)} - esac''; - in - patterns: '' - #! /bin/sh - set -euf - ${concatStringsSep "\n" (map (go 1) patterns)} - exit -1 - ''; - - reponames = rules: sort lessThan (unique (map (x: x.repo.name) rules)); - - # TODO makeGitHooks that uses runCommand instead of scriptFarm? - scriptFarm = - farm-name: scripts: - let - makeScript = script-name: script-string: { - name = script-name; - path = writeScript "${farm-name}_${script-name}" script-string; - }; - in - linkFarm farm-name (mapAttrsToList makeScript scripts); - - writeJSON = name: data: writeText name (toJSON data); - - - cfg = config.services.git; + cfg = config.tv.git; + arg' = arg // { inherit cfg; }; in # TODO unify logging of shell scripts to user and journal @@ -81,301 +15,13 @@ in { imports = [ - ./cgit.nix + ../../tv/nginx ]; - options.services.git = { - enable = mkOption { - type = types.bool; - default = false; - description = "Enable Git repository hosting."; - }; - cgit = mkOption { - type = types.bool; - default = true; - description = "Enable cgit."; # TODO better desc; talk about nginx - }; - dataDir = mkOption { - type = types.str; - default = "/var/lib/git"; - description = "Directory used to store repositories."; - }; - etcDir = mkOption { - type = types.str; - default = "/etc/git"; - }; - rules = mkOption { - type = types.unspecified; - }; - repos = mkOption { - type = types.attrsOf (types.submodule ({ - options = { - desc = mkOption { - type = types.nullOr types.str; - default = null; - description = '' - Repository description. - ''; - }; - section = mkOption { - type = types.nullOr types.str; - default = null; - description = '' - Repository section. - ''; - }; - name = mkOption { - type = types.str; - description = '' - Repository name. - ''; - }; - hooks = mkOption { - type = types.attrsOf types.str; - description = '' - Repository-specific hooks. - ''; - }; - public = mkOption { - type = types.bool; - default = false; - description = '' - Allow everybody to read the repository via HTTP if cgit enabled. - ''; - # TODO allow every configured user to fetch the repository via SSH. - }; - }; - })); - - default = {}; - - example = literalExample '' - { - testing = { - name = "testing"; - hooks.post-update = ''' - #! /bin/sh - set -euf - echo post-update hook: $* >&2 - '''; - }; - testing2 = { name = "testing2"; }; - } - ''; - - description = '' - Repositories. - ''; - }; - users = mkOption { - type = types.unspecified; - }; - }; - - config = - let - git-ssh-command = writeScript "git-ssh-command" '' - #! /bin/sh - set -euf - - PATH=${makeSearchPath "bin" (with pkgs; [ - coreutils - git - gnugrep - gnused - systemd - ])} - - abort() { - echo "error: $1" >&2 - systemd-cat -p err -t git echo "error: $1" - exit -1 - } - - GIT_SSH_USER=$1 - - systemd-cat -p info -t git echo \ - "authorizing $GIT_SSH_USER $SSH_CONNECTION $SSH_ORIGINAL_COMMAND" - - # References: The Base Definitions volume of - # POSIX.1‐2013, Section 3.278, Portable Filename Character Set - portable_filename_bre="^[A-Za-z0-9._-]\\+$" - - command=$(echo "$SSH_ORIGINAL_COMMAND" \ - | sed -n 's/^\([^ ]*\) '"'"'\(.*\)'"'"'/\1/p' \ - | grep "$portable_filename_bre" \ - || abort 'cannot read command') - - GIT_SSH_REPO=$(echo "$SSH_ORIGINAL_COMMAND" \ - | sed -n 's/^\([^ ]*\) '"'"'\(.*\)'"'"'/\2/p' \ - | grep "$portable_filename_bre" \ - || abort 'cannot read reponame') - - ${cfg.etcDir}/authorize-command \ - "$GIT_SSH_USER" "$GIT_SSH_REPO" "$command" \ - || abort 'access denied' - - repodir=${escapeShellArg cfg.dataDir}/$GIT_SSH_REPO - - systemd-cat -p info -t git \ - echo "authorized exec $command $repodir" - - export GIT_SSH_USER - export GIT_SSH_REPO - exec "$command" "$repodir" - ''; - - init-script = writeScript "git-init" '' - #! /bin/sh - set -euf - - PATH=${makeSearchPath "bin" (with pkgs; [ - coreutils - findutils - gawk - git - gnugrep - gnused - ])} - - dataDir=${escapeShellArg cfg.dataDir} - mkdir -p "$dataDir" - - # Notice how the presence of hooks symlinks determine whether - # we manage a repositry or not. - - # Make sure that no existing repository has hooks. We can delete - # symlinks because we assume we created them. - find "$dataDir" -mindepth 2 -maxdepth 2 -name hooks -type l -delete - bad_hooks=$(find "$dataDir" -mindepth 2 -maxdepth 2 -name hooks) - if echo "$bad_hooks" | grep -q .; then - printf 'error: unknown hooks:\n%s\n' \ - "$(echo "$bad_hooks" | sed 's/^/ /')" \ - >&2 - exit -1 - fi - - # Initialize repositories. - ${concatMapStringsSep "\n" (repo: - let - hooks = scriptFarm "git-hooks" (makeHooks repo); - in - '' - reponame=${escapeShellArg repo.name} - repodir=$dataDir/$reponame - mode=${toString (if isPublicRepo repo then 0711 else 0700)} - if ! test -d "$repodir"; then - mkdir -m "$mode" "$repodir" - git init --bare --template=/var/empty "$repodir" - chown -R git:nogroup "$repodir" - fi - ln -s ${hooks} "$repodir/hooks" - '' - ) (attrValues cfg.repos)} - - # Warn about repositories that exist but aren't mentioned in the - # current configuration (and thus didn't receive a hooks symlink). - unknown_repos=$(find "$dataDir" -mindepth 1 -maxdepth 1 \ - -type d \! -exec test -e '{}/hooks' \; -print) - if echo "$unknown_repos" | grep -q .; then - printf 'warning: stale repositories:\n%s\n' \ - "$(echo "$unknown_repos" | sed 's/^/ /')" \ - >&2 - fi - ''; - - makeHooks = repo: removeAttrs repo.hooks [ "pre-receive" ] // { - pre-receive = '' - #! /bin/sh - set -euf - - PATH=${makeSearchPath "bin" (with pkgs; [ - coreutils # env - git - systemd - ])} - - accept() { - #systemd-cat -p info -t git echo "authorized $1" - accept_string="''${accept_string+$accept_string - }authorized $1" - } - reject() { - #systemd-cat -p err -t git echo "denied $1" - #echo 'access denied' >&2 - #exit_code=-1 - reject_string="''${reject_string+$reject_string - }access denied: $1" - } - - empty=0000000000000000000000000000000000000000 - - accept_string= - reject_string= - while read oldrev newrev ref; do - - if [ $oldrev = $empty ]; then - receive_mode=create - elif [ $newrev = $empty ]; then - receive_mode=delete - elif [ "$(git merge-base $oldrev $newrev)" = $oldrev ]; then - receive_mode=fast-forward - else - receive_mode=non-fast-forward - fi - - if ${cfg.etcDir}/authorize-push \ - "$GIT_SSH_USER" "$GIT_SSH_REPO" "$ref" "$receive_mode"; then - accept "$receive_mode $ref" - else - reject "$receive_mode $ref" - fi - done - - if [ -n "$reject_string" ]; then - systemd-cat -p err -t git echo "$reject_string" - exit -1 - fi - - systemd-cat -p info -t git echo "$accept_string" - - ${optionalString (hasAttr "post-receive" repo.hooks) '' - # custom post-receive hook - ${repo.hooks.post-receive}''} - ''; - }; - - etc-base = - assert (hasPrefix "/etc/" cfg.etcDir); - removePrefix "/etc/" cfg.etcDir; - in - mkIf cfg.enable { - system.activationScripts.git-init = "${init-script}"; - - # TODO maybe put all scripts here and then use PATH? - environment.etc."${etc-base}".source = - scriptFarm "git-ssh-authorizers" { - authorize-command = makeAuthorizeScript (map ({ repo, user, perm }: [ - (map getName (ensureList user)) - (map getName (ensureList repo)) - (map getName perm.allow-commands) - ]) cfg.rules); - - authorize-push = makeAuthorizeScript (map ({ repo, user, perm }: [ - (map getName (ensureList user)) - (map getName (ensureList repo)) - (ensureList perm.allow-receive-ref) - (map getName perm.allow-receive-modes) - ]) (filter (x: hasAttr "allow-receive-ref" x.perm) cfg.rules)); - }; + options.tv.git = import ./options.nix arg'; - users.extraUsers = singleton { - description = "Git repository hosting user"; - name = "git"; - shell = "/bin/sh"; - openssh.authorizedKeys.keys = - mapAttrsToList (_: makeAuthorizedKey git-ssh-command) cfg.users; - uid = 112606723; # genid git - }; - }; + config = mkIf cfg.enable (mkMerge [ + (import ./config.nix arg') + (mkIf cfg.cgit (import ./cgit.nix arg')) + ]); } diff --git a/modules/tv/git/options.nix b/modules/tv/git/options.nix new file mode 100644 index 000000000..c251d7d4c --- /dev/null +++ b/modules/tv/git/options.nix @@ -0,0 +1,93 @@ +{ lib, ... }: + +let + inherit (lib) literalExample mkOption types; +in + +{ + enable = mkOption { + type = types.bool; + default = false; + description = "Enable Git repository hosting."; + }; + cgit = mkOption { + type = types.bool; + default = true; + description = "Enable cgit."; # TODO better desc; talk about nginx + }; + dataDir = mkOption { + type = types.str; + default = "/var/lib/git"; + description = "Directory used to store repositories."; + }; + etcDir = mkOption { + type = types.str; + default = "/etc/git"; + }; + rules = mkOption { + type = types.unspecified; + }; + repos = mkOption { + type = types.attrsOf (types.submodule ({ + options = { + desc = mkOption { + type = types.nullOr types.str; + default = null; + description = '' + Repository description. + ''; + }; + section = mkOption { + type = types.nullOr types.str; + default = null; + description = '' + Repository section. + ''; + }; + name = mkOption { + type = types.str; + description = '' + Repository name. + ''; + }; + hooks = mkOption { + type = types.attrsOf types.str; + description = '' + Repository-specific hooks. + ''; + }; + public = mkOption { + type = types.bool; + default = false; + description = '' + Allow everybody to read the repository via HTTP if cgit enabled. + ''; + # TODO allow every configured user to fetch the repository via SSH. + }; + }; + })); + + default = {}; + + example = literalExample '' + { + testing = { + name = "testing"; + hooks.post-update = ''' + #! /bin/sh + set -euf + echo post-update hook: $* >&2 + '''; + }; + testing2 = { name = "testing2"; }; + } + ''; + + description = '' + Repositories. + ''; + }; + users = mkOption { + type = types.unspecified; + }; +} diff --git a/modules/tv/git/public.nix b/modules/tv/git/public.nix index 7dc93e821..09d1e6b4b 100644 --- a/modules/tv/git/public.nix +++ b/modules/tv/git/public.nix @@ -65,8 +65,7 @@ in imports = [ ./. ]; - - services.git = { + tv.git = { enable = true; inherit repos rules users; }; |