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
|
/* ISC license. */
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <skalibs/uint16.h>
#include <skalibs/bytestr.h>
#include <skalibs/tai.h>
#include <skalibs/direntry.h>
#include <skalibs/djbunix.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <s6/s6-supervise.h>
#include <s6/ftrigr.h>
#include <s6/ftrigw.h>
#include <s6-rc/s6rc-servicedir.h>
static void rollback (char const *live, char const *s, unsigned int len)
{
while (len)
{
unsigned int n = str_len(s) + 1 ;
s6rc_servicedir_unsupervise(live, s, 0) ;
s += n ; len -= n ;
}
}
int s6rc_servicedir_manage (char const *live, tain_t const *deadline, tain_t *stamp)
{
ftrigr_t a = FTRIGR_ZERO ;
stralloc newnames = STRALLOC_ZERO ;
genalloc ids = GENALLOC_ZERO ; /* uint16 */
gid_t gid = getgid() ;
unsigned int livelen = str_len(live) ;
int ok = 1 ;
int e = 0 ;
DIR *dir ;
char dirfn[livelen + 13] ;
if (!ftrigr_startf(&a, deadline, stamp)) return 0 ;
byte_copy(dirfn, livelen, live) ;
byte_copy(dirfn + livelen, 13, "/servicedirs") ;
dir = opendir(dirfn) ;
if (!dir) goto closederr ;
for (;;)
{
direntry *d ;
errno = 0 ;
d = readdir(dir) ;
if (!d) break ;
if (d->d_name[0] == '.') continue ;
{
unsigned int len = str_len(d->d_name) ;
int r ;
uint16 id ;
char srcfn[livelen + 20 + len] ;
char dstfn[livelen + 10 + len] ;
byte_copy(srcfn, livelen + 12, dirfn) ;
srcfn[livelen + 12] = '/' ;
byte_copy(srcfn + livelen + 13, len + 1, d->d_name) ;
r = s6_svc_ok(srcfn) ;
if (r < 0) { e = errno ; goto err ; }
if (!r)
{
byte_copy(srcfn + livelen + 13 + len, 6, "/down") ;
if (!touch(srcfn)) { e = errno ; goto err ; }
byte_copy(srcfn + livelen + 14 + len, 6, "event") ;
if (!ftrigw_fifodir_make(srcfn, gid, 0)) { e = errno ; goto err ; }
id = ftrigr_subscribe(&a, srcfn, "s", 0, deadline, stamp) ;
if (!id) { e = errno ; goto err ; }
if (!genalloc_append(uint16, &ids, &id)) { e = errno ; goto err ; }
srcfn[livelen + 13 + len] = 0 ;
}
byte_copy(dstfn, livelen, live) ;
byte_copy(dstfn + livelen, 9, "/scandir/") ;
byte_copy(dstfn + livelen + 9, len + 1, d->d_name) ;
if (symlink(srcfn, dstfn) < 0)
{
if (!r || errno != EEXIST) { e = errno ; goto err ; }
}
else if (!r)
{
if (!stralloc_catb(&newnames, d->d_name, len + 1))
{
e = errno ;
s6rc_servicedir_unsupervise(live, d->d_name, 0) ;
goto err ;
}
}
}
}
if (errno) { e = errno ; goto err ; }
dir_close(dir) ;
{
char scanfn[livelen + 9] ;
register int r ;
byte_copy(scanfn, livelen, live) ;
byte_copy(scanfn + livelen, 9, "/scandir") ;
r = s6_svc_writectl(scanfn, S6_SVSCAN_CTLDIR, "a", 1) ;
if (r < 0) { e = errno ; goto closederr ; }
if (!r) ok = 3 ;
else if (ftrigr_wait_and(&a, genalloc_s(uint16, &ids), genalloc_len(uint16, &ids), deadline, stamp) < 0)
{ e = errno ; goto closederr ; }
}
ftrigr_end(&a) ;
genalloc_free(uint16, &ids) ;
stralloc_free(&newnames) ;
return ok ;
err:
dir_close(dir) ;
closederr:
ftrigr_end(&a) ;
genalloc_free(uint16, &ids) ;
rollback(live, newnames.s, newnames.len) ;
stralloc_free(&newnames) ;
errno = e ;
return 0 ;
}
|
