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add/remove-shell: copy /etc/shells mode to new file

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function                                             old     new   delta
add_remove_shell_main                                259     300     +41

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-05-26 16:45:28 +02:00
parent f547041940
commit 13d72c3fd9
1 changed files with 9 additions and 11 deletions
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20
loginutils/add-remove-shell.c
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@ -43,10 +43,7 @@
#define REMOVE_SHELL (ENABLE_REMOVE_SHELL && (!ENABLE_ADD_SHELL || applet_name[0] == 'r'))
#define ADD_SHELL (ENABLE_ADD_SHELL && (!ENABLE_REMOVE_SHELL || applet_name[0] == 'a'))
/* NB: we use the _address_, not the value, of this string
* as a "special value of pointer" in the code.
*/
static const char dont_add[] ALIGN1 = "\n";
#define dont_add ((char*)(uintptr_t)1)
int add_remove_shell_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int add_remove_shell_main(int argc UNUSED_PARAM, char **argv)
@ -54,6 +51,9 @@ int add_remove_shell_main(int argc UNUSED_PARAM, char **argv)
FILE *orig_fp;
char *orig_fn;
char *new_fn;
struct stat sb;
sb.st_mode = 0666;
argv++;
@ -61,6 +61,8 @@ int add_remove_shell_main(int argc UNUSED_PARAM, char **argv)
if (!orig_fn)
return EXIT_FAILURE;
orig_fp = fopen_for_read(orig_fn);
if (orig_fp)
xfstat(fileno(orig_fp), &sb, orig_fn);
new_fn = xasprintf("%s.tmp", orig_fn);
/*
@ -71,13 +73,9 @@ int add_remove_shell_main(int argc UNUSED_PARAM, char **argv)
* after which it should revert to O_TRUNC.
* For now, I settle for O_TRUNC instead.
*/
xmove_fd(xopen(new_fn, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
/* TODO:
struct stat sb;
xfstat(fileno(orig_fp), &sb);
xmove_fd(xopen3(new_fn, O_WRONLY | O_CREAT | O_TRUNC, sb.st_mode), STDOUT_FILENO);
/* TODO?
xfchown(STDOUT_FILENO, sb.st_uid, sb.st_gid);
xfchmod(STDOUT_FILENO, sb.st_mode);
*/
if (orig_fp) {
@ -95,7 +93,7 @@ int add_remove_shell_main(int argc UNUSED_PARAM, char **argv)
}
/* we are add-shell */
/* mark this name as "do not add" */
*cpp = (char*)dont_add;
*cpp = dont_add;
}
cpp++;
}