aboutsummaryrefslogtreecommitdiffstats
path: root/pkgs/populate/default.nix
blob: 40c37e38fe6e1eca8ecd654d5a57edc7533021f8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
with import ../../lib;
with shell;

{ coreutils, dash, findutils, git, jq, openssh, pass, rsync, writers }:

let
  check = { force, target }: let
    sentinelFile = "${target.path}/.populate";
  in runShell target /* sh */ ''
    ${optionalString force /* sh */ ''
      mkdir -vp ${quote (dirOf sentinelFile)} >&2
      touch ${quote sentinelFile}
    ''}
    if ! test -e ${quote sentinelFile}; then
      >&2 printf 'error: missing sentinel file: %s\n' ${quote (
        optionalString (!isLocalTarget target) "${target.host}:" +
        sentinelFile
      )}
      exit 1
    fi
  '';

  do-backup = { target }: let
    sentinelFile = "${target.path}/.populate";
  in
    runShell target /* sh */ ''
      if ! test -d ${quote sentinelFile}; then
        >&2 printf 'error" sentinel file is not a directory: %s\n' ${quote (
          optionalString (!isLocalTarget target) "${target.host}:" +
          sentinelFile
        )}
        exit 1
      fi
      rsync >&2 \
          -aAXF \
          --delete \
          --exclude /.populate \
          --link-dest=${quote target.path} \
          ${target.path}/ \
          ${target.path}/.populate/backup/
    '';

  pop.derivation = target: source: runShell target /* sh */ ''
    nix-build -E ${quote source.text} -o ${quote target.path} >&2
  '';

  pop.file = target: source: let
    configAttrs = ["useChecksum" "exclude" "filters" "deleteExcluded"];
    config = filterAttrs (name: _: elem name configAttrs) source;
  in
    rsync' target config (quote source.path);

  pop.git = target: source: runShell target /* sh */ ''
    set -efu
    if ! test -e ${quote target.path}; then
      git clone --recurse-submodules ${quote source.url} ${quote target.path}
    fi
    cd ${quote target.path}
    if ! url=$(git config remote.origin.url); then
      git remote add origin ${quote source.url}
    elif test "$url" != ${quote source.url}; then
      git remote set-url origin ${quote source.url}
    fi

    # TODO resolve git_ref to commit hash
    hash=${quote source.ref}

    if ! test "$(git log --format=%H -1)" = "$hash"; then
      ${if source.fetchAlways then /* sh */ ''
        git fetch origin
      '' else /* sh */ ''
        if ! git log -1 "$hash" >/dev/null 2>&1; then
          git fetch origin
        fi
      ''}
      git reset --hard "$hash" >&2
      git submodule update --init --recursive
    fi

    git clean -dfx \
        ${concatMapStringsSep " "
          (pattern: /* sh */ "-e ${quote pattern}")
          source.clean.exclude }
  '';

  pop.pass = target: source: let
    passPrefix = "${source.dir}/${source.name}";
  in /* sh */ ''
    set -efu

    umask 0077

    if test -e ${quote source.dir}/.git; then
      local_pass_info=${quote source.name}\ $(${git}/bin/git -C ${quote source.dir} log -1 --format=%H ${quote source.name})
      remote_pass_info=$(${runShell target /* sh */ ''
        cat ${quote target.path}/.pass_info || :
      ''})

      if test "$local_pass_info" = "$remote_pass_info"; then
        exit 0
      fi
    fi

    tmp_dir=$(${coreutils}/bin/mktemp -dt populate-pass.XXXXXXXX)
    trap cleanup EXIT
    cleanup() {
      rm -fR "$tmp_dir"
    }

    ${findutils}/bin/find ${quote passPrefix} -type f |
    while read -r gpg_path; do

      rel_name=''${gpg_path#${quote passPrefix}}
      rel_name=''${rel_name%.gpg}

      pass_date=$(
        ${git}/bin/git -C ${quote source.dir} log -1 --format=%aI "$gpg_path"
      )
      pass_name=${quote source.name}/$rel_name
      tmp_path=$tmp_dir/$rel_name

      ${coreutils}/bin/mkdir -p "$(${coreutils}/bin/dirname "$tmp_path")"
      PASSWORD_STORE_DIR=${quote source.dir} ${pass}/bin/pass show "$pass_name" > "$tmp_path"
      ${coreutils}/bin/touch -d "$pass_date" "$tmp_path"
    done

    if test -n "''${local_pass_info-}"; then
      echo "$local_pass_info" > "$tmp_dir"/.pass_info
    fi

    ${rsync' target {} /* sh */ "$tmp_dir"}
  '';

  pop.pipe = target: source: /* sh */ ''
    ${quote source.command} | {
      ${runShell target /* sh */ "cat > ${quote target.path}"}
    }
  '';

  # TODO rm -fR instead of ln -f?
  pop.symlink = target: source: runShell target /* sh */ ''
    ln -fnsT ${quote source.target} ${quote target.path}
  '';

  populate = target: name: source: let
    source' = source.${source.type};
    target' = target // { path = "${target.path}/${name}"; };
  in writers.writeDash "populate.${target'.host}.${name}" ''
    set -efu
    ${pop.${source.type} target' source'}
  '';

  rsync' = target: config: sourcePath: /* sh */ ''
    source_path=${sourcePath}
    if test -d "$source_path"; then
      source_path=$source_path/
    fi
    ${rsync}/bin/rsync \
        ${optionalString (config.useChecksum or false) /* sh */ "--checksum"} \
        ${optionalString target.sudo /* sh */ "--rsync-path=\"sudo rsync\""} \
        ${concatMapStringsSep " "
          (pattern: /* sh */ "--exclude ${quote pattern}")
          (config.exclude or [])} \
        ${concatMapStringsSep " "
          (filter: /* sh */ "--${filter.type} ${quote filter.pattern}")
          (config.filters or [])} \
        -e ${quote (ssh' target)} \
        -vFrlptD \
        ${optionalString (config.deleteExcluded or true) /* sh */ "--delete-excluded"} \
        "$source_path" \
        ${quote (
          optionalString (!isLocalTarget target) (
            (optionalString (target.user != "") "${target.user}@") +
            "${target.host}:"
          ) +
          target.path
        )} \
      >&2
  '';

  runShell = target: command:
    if isLocalTarget target
      then command
      else
        if target.sudo then /* sh */ ''
          ${ssh' target} ${quote target.host} ${quote "sudo bash -c ${quote command}"}
        '' else ''
          ${ssh' target} ${quote target.host} ${quote command}
        '';

  ssh' = target: concatMapStringsSep " " quote (flatten [
    "${openssh}/bin/ssh"
    (optionals (target.user != "") ["-l" target.user])
    "-p" target.port
    "-T"
    target.extraOptions
  ]);

in

{ backup ? false, force ? false, source, target }:
writers.writeDash "populate.${target.host}" ''
  set -efu
  ${check { inherit force target; }}
  set -x
  ${optionalString backup (do-backup { inherit target; })}
  ${concatStringsSep "\n" (mapAttrsToList (populate target) source)}
''