1 /* ISC license. */
2
3 #include <skalibs/nonposix.h>
4 #include <unistd.h>
5 #include <sys/stat.h>
6 #include <string.h>
7 #include <errno.h>
8 #include <stdlib.h>
9 #include <stdio.h>
10
11 #include <skalibs/bytestr.h>
12 #include <skalibs/env.h>
13 #include <skalibs/djbunix.h>
14
15 /* XXX: breaks layering, but really openat() should be supported everywhere */
16 #include <skalibs/unix-transactional.h>
17
18 #define SUFFIX ":envdump:XXXXXX"
19
env_dump(char const * dir,mode_t mode,char const * const * envp)20 int env_dump (char const *dir, mode_t mode, char const *const *envp)
21 {
22 int fd ;
23 size_t dirlen = strlen(dir) ;
24 char tmpdir[dirlen + sizeof(SUFFIX)] ;
25 memcpy(tmpdir, dir, dirlen) ;
26 memcpy(tmpdir + dirlen, SUFFIX, sizeof(SUFFIX)) ;
27 if (!mkdtemp(tmpdir)) return 0 ;
28 fd = open_read(tmpdir) ;
29 if (fd == -1) goto err ;
30 for (; *envp ; envp++)
31 {
32 size_t len = str_chr(*envp, '=') ;
33 size_t vallen = strlen(*envp + len + 1) ;
34 char fn[len + 1] ;
35 memcpy(fn, *envp, len) ;
36 fn[len] = 0 ;
37 len = openwritenclose_at(fd, fn, *envp + len + 1, vallen) ;
38 if (len < vallen) goto cerr ;
39 }
40 fd_close(fd) ;
41 if (chmod(tmpdir, mode) == -1) goto err ;
42 if (rename(tmpdir, dir) == -1) goto err ;
43 return 1 ;
44
45 cerr:
46 fd_close(fd) ;
47 err:
48 {
49 int e = errno ;
50 rm_rf(tmpdir) ;
51 errno = e ;
52 }
53 return 0 ;
54 }
55