retitle 586736 dash: Can't open read-only scripts
merge 586807 586736
thanks
Krzysztof A. Sobiecki wrote:
> sob...@solis:/tmp$ ./a.sh
> /bin/sh: Can't open ./a.sh
>
> During the boot-up process / partition is read-only and because of that
> dash is unable to execute /etc/init.d/rcS and /etc/init.d/rc scripts.
>
> Apparently problem lies inside patch:
> 0006--INPUT-exit-127-if-command_file-is-given-but-doesn-t.diff
[...]
>
> - if ((fd = open(fname, O_RDONLY)) < 0) {
> + if ((fd = open(fname, O_RDWR)) < 0) {
>
> After changing it back to O_RDONLY dash properly executes read-only scripts.
Thanks for the triage. Here’s a pointer for the interested:
http://thread.gmane.org/gmane.comp.shells.dash/291/focus=295
> Why would anyone want to open script in read-write mode?
Based on open(2), I am guessing it is a hack to force EISDIR when
fname refers to a directory. That is, I am guessing the intended
effect is something like this:
static int
isdir_hack(int fd)
{
struct stat64 st;
if (fstat64(fd, &st) < 0)
return -1;
if (S_ISDIR(st.st_mode)) {
errno = EISDIR;
return -1;
}
return 0;
}
...
if ((fd = open(fname, O_RDONLY)) < 0 || isdir_hack(fd) < 0) {
Please take that with a grain of salt, since I am not familiar with
this code.
Cheers,
Jonathan
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