Working on automatic rmdom for bad domains during regen
[hcoop/domtool2.git] / src / slave.sml
1 (* HCoop Domtool (http://hcoop.sourceforge.net/)
2 * Copyright (c) 2006, Adam Chlipala
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 *)
18
19 (* Code for receiving and executing configuration files *)
20
21 structure Slave :> SLAVE = struct
22
23 datatype file_action =
24 Add
25 | Delete of bool
26 | Modify
27
28 fun isDelete (Delete _) = true
29 | isDelete _ = false
30
31 type file_status = {action : file_action,
32 domain : string,
33 dir : string,
34 file : string}
35
36 val fileHandler = ref (fn _ : file_status => ())
37 val preHandler = ref (fn () => ())
38 val postHandler = ref (fn () => ())
39
40 fun registerFileHandler handler =
41 let
42 val old = !fileHandler
43 in
44 fileHandler := (fn x => (handler x; old x))
45 end
46
47 fun registerPreHandler handler =
48 let
49 val old = !preHandler
50 in
51 preHandler := (fn () => (handler (); old ()))
52 end
53
54 fun registerPostHandler handler =
55 let
56 val old = !postHandler
57 in
58 postHandler := (fn () => (handler (); old ()))
59 end
60
61 fun handleChanges fs = (!preHandler ();
62 app (fn recd as {action, file, ...} =>
63 (!fileHandler recd;
64 case action of
65 Delete b =>
66 if b andalso Posix.FileSys.access (file, []) then
67 OS.FileSys.remove file
68 else
69 ()
70 | _ => ())) fs;
71 !postHandler ())
72
73 fun shell ss = OS.Process.isSuccess (OS.Process.system (String.concat ss))
74
75 fun shellF (ss, msg) =
76 let
77 val s = String.concat ss
78 in
79 if OS.Process.isSuccess (OS.Process.system s) then
80 ()
81 else
82 ErrorMsg.error NONE (msg s)
83 end
84
85 fun hostname () =
86 let
87 val inf = TextIO.openIn "/etc/hostname"
88 in
89 case TextIO.inputLine inf of
90 NONE => (TextIO.closeIn inf; raise Fail "No line in /etc/hostname")
91 | SOME line => (TextIO.closeIn inf; String.substring (line, 0, size line - 1))
92 end
93
94 fun concatTo p fname =
95 let
96 fun visitDir dname =
97 let
98 val dir = Posix.FileSys.opendir dname
99
100 fun loop () =
101 case Posix.FileSys.readdir dir of
102 NONE => Posix.FileSys.closedir dir
103 | SOME fname' =>
104 let
105 val path = OS.Path.joinDirFile {dir = dname, file = fname'}
106 in
107 if Posix.FileSys.ST.isDir (Posix.FileSys.stat path) then
108 visitDir path
109 else if p fname' then
110 shellF ([Config.cat, " ", path, " >>", fname],
111 fn cl => "Error concatenating: " ^ cl)
112 else
113 ();
114 loop ()
115 end
116 in
117 loop ()
118 end
119 in
120 TextIO.closeOut (TextIO.openOut fname);
121 visitDir (OS.Path.joinDirFile {dir = Config.resultRoot, file = hostname ()})
122 end
123
124 fun enumerateTo p sep fname =
125 let
126 val outf = TextIO.openOut fname
127
128 val first = ref true
129 val baseLen = length (String.fields (fn ch => ch = #"/") Config.resultRoot) + 1
130
131 fun visitDir dname =
132 let
133 val dir = Posix.FileSys.opendir dname
134
135 fun loop () =
136 case Posix.FileSys.readdir dir of
137 NONE => Posix.FileSys.closedir dir
138 | SOME fname' =>
139 let
140 val path = OS.Path.joinDirFile {dir = dname, file = fname'}
141 in
142 if Posix.FileSys.ST.isDir (Posix.FileSys.stat path) then
143 visitDir path
144 else if p fname' then
145 let
146 val toks = String.fields (fn ch => ch = #"/") dname
147 val toks = List.drop (toks, baseLen)
148 val dom = String.concatWith "." (rev toks)
149 in
150 if !first then
151 first := false
152 else
153 TextIO.output (outf, sep);
154 TextIO.output (outf, dom)
155 end
156 else
157 ();
158 loop ()
159 end
160 in
161 loop ()
162 end
163 in
164 visitDir (OS.Path.joinDirFile {dir = Config.resultRoot, file = hostname ()});
165 TextIO.closeOut outf
166 end
167
168 fun readList fname =
169 let
170 val inf = TextIO.openIn fname
171
172 fun loop acc =
173 case TextIO.inputLine inf of
174 NONE => rev acc
175 | SOME line => loop (String.substring (line, 0, size line - 1) :: acc)
176 in
177 loop []
178 before TextIO.closeIn inf
179 end
180
181 fun writeList (fname, ls) =
182 let
183 val outf = TextIO.openOut fname
184 in
185 app (fn s => (TextIO.output (outf, s);
186 TextIO.output1 (outf, #"\n"))) ls;
187 TextIO.closeOut outf
188 end
189
190 fun lineInFile fname line =
191 let
192 val inf = TextIO.openIn fname
193 val line' = line ^ "\n"
194
195 fun loop () =
196 case TextIO.inputLine inf of
197 NONE => false
198 | SOME line => line = line' orelse loop ()
199 in
200 loop ()
201 before TextIO.closeIn inf
202 end handle IO.Io _ => false
203
204 fun inGroup {user, group} =
205 List.exists (fn x => x = user)
206 (Posix.SysDB.Group.members (Posix.SysDB.getgrnam group))
207 handle OS.SysErr _ => false
208
209 fun mkDirAll dir = ignore (OS.Process.system ("mkdir -p " ^ dir))
210
211 fun remove (ls, x) = List.filter (fn y => y <> x) ls
212 fun removeDups ls = List.foldr (fn (x, ls) =>
213 if List.exists (fn y => y = x) ls then
214 ls
215 else
216 x :: ls) [] ls
217
218 fun moveDirCreate {from, to} =
219 (mkDirAll to;
220 if Posix.FileSys.access (from, []) then
221 (ignore (OS.Process.system ("rm -rf " ^ to));
222 ignore (OS.Process.system ("cp -r " ^ from ^ " " ^ to));
223 ignore (OS.Process.system ("rm -rf " ^ from)))
224 else
225 ())
226
227 end