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remount: Refactor to helper function instead of loop

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Prep for further work.  It was silly to use a loop on
a static array of two elements.

Closes: #1760
Approved by: jlebon
This commit is contained in:
Colin Walters 2018-10-21 12:53:27 -04:00 committed by Atomic Bot
parent 1d6347fe97
commit 1e16aec357
1 changed files with 33 additions and 34 deletions
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67
src/switchroot/ostree-remount.c
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@ -39,13 +39,40 @@
#include "ostree-mount-util.h"
static void
do_remount (const char *target)
{
struct stat stbuf;
if (lstat (target, &stbuf) < 0)
return;
/* Silently ignore symbolic links; we expect these to point to
* /sysroot, and thus there isn't a bind mount there.
*/
if (S_ISLNK (stbuf.st_mode))
return;
/* If not a mountpoint, skip it */
struct statvfs stvfsbuf;
if (statvfs (target, &stvfsbuf) == -1)
return;
/* If no read-only flag, skip it */
if ((stvfsbuf.f_flag & ST_RDONLY) == 0)
return;
/* It's a mounted, read-only fs; remount it */
if (mount (target, target, NULL, MS_REMOUNT | MS_SILENT, NULL) < 0)
{
/* Also ignore EINVAL - if the target isn't a mountpoint
* already, then assume things are OK.
*/
if (errno != EINVAL)
err (EXIT_FAILURE, "failed to remount %s", target);
}
else
printf ("Remounted: %s\n", target);
}
int
main(int argc, char *argv[])
{
const char *remounts[] = { "/sysroot", "/var", NULL };
struct stat stbuf;
int i;
/* When systemd is in use this is normally created via the generator, but
* we ensure it's created here as well for redundancy.
*/
@ -65,39 +92,11 @@ main(int argc, char *argv[])
/* If / isn't writable, don't do any remounts; we don't want
* to clear the readonly flag in that case.
*/
exit (EXIT_SUCCESS);
}
for (i = 0; remounts[i] != NULL; i++)
{
const char *target = remounts[i];
if (lstat (target, &stbuf) < 0)
continue;
/* Silently ignore symbolic links; we expect these to point to
* /sysroot, and thus there isn't a bind mount there.
*/
if (S_ISLNK (stbuf.st_mode))
continue;
/* If not a mountpoint, skip it */
struct statvfs stvfsbuf;
if (statvfs (target, &stvfsbuf) == -1)
continue;
/* If no read-only flag, skip it */
if ((stvfsbuf.f_flag & ST_RDONLY) == 0)
continue;
/* It's a mounted, read-only fs; remount it */
if (mount (target, target, NULL, MS_REMOUNT | MS_SILENT, NULL) < 0)
{
/* Also ignore EINVAL - if the target isn't a mountpoint
* already, then assume things are OK.
*/
if (errno != EINVAL)
err (EXIT_FAILURE, "failed to remount %s", target);
}
else
printf ("Remounted: %s\n", target);
}
do_remount ("/sysroot");
do_remount ("/var");
exit (EXIT_SUCCESS);
}