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Refactor, replace deprecated setfsent() & C:o with setmntent()

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The setfsent() family of APIs was never standardized and on Linux only
GLIBC implement them.  We've tried to overcome this limitation, and to
support uClibc/uClibc-ng and musl libc, by providing replacements APIs
in helpers.c.

However, and since we want to support alternative /etc/fstab files, the
setmntent() family of APIs is more widespread and supports reading from
any fstab or mtab file.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2022-04-20 07:20:33 +02:00
parent 05be281301
commit 5593372ffb
5 changed files with 31 additions and 105 deletions
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src/finit.c
+27 -42
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@@ -26,11 +26,10 @@
#include <ctype.h>
#include <dirent.h>
#ifdef HAVE_FSTAB_H
#include <fstab.h>
#endif
#include <getopt.h>
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#endif
#include <time.h> /* tzet() */
#include <sys/klog.h>
#include <sys/mount.h>
@@ -111,41 +110,43 @@ static void banner(void)
*/
static int fsck(int pass)
{
struct fstab *fs;
struct mntent *mnt;
int rc = 0;
FILE *fp;
if (!setfsent()) {
fp = setmntent("/etc/fstab", "r");
if (!fp) {
_pe("Failed opening fstab");
return 1;
}
while ((fs = getfsent())) {
while ((mnt = getmntent(fp))) {
char cmd[80];
struct stat st;
int fsck_rc = 0;
if (fs->fs_passno != pass)
if (mnt->mnt_passno != pass)
continue;
errno = 0;
if (stat(fs->fs_spec, &st) || !S_ISBLK(st.st_mode)) {
if (!string_match(fs->fs_spec, "UUID=") && !string_match(fs->fs_spec, "LABEL=")) {
_d("Cannot fsck %s, not a block device: %s", fs->fs_spec, strerror(errno));
if (stat(mnt->mnt_fsname, &st) || !S_ISBLK(st.st_mode)) {
if (!string_match(mnt->mnt_fsname, "UUID=") && !string_match(mnt->mnt_fsname, "LABEL=")) {
_d("Cannot fsck %s, not a block device: %s", mnt->mnt_fsname, strerror(errno));
continue;
}
}
if (ismnt("/proc/mounts", fs->fs_file, "rw")) {
_d("Skipping fsck of %s, already mounted rw on %s.", fs->fs_spec, fs->fs_file);
if (ismnt("/proc/mounts", mnt->mnt_dir, "rw")) {
_d("Skipping fsck of %s, already mounted rw on %s.", mnt->mnt_fsname, mnt->mnt_dir);
continue;
}
#ifdef FSCK_FIX
snprintf(cmd, sizeof(cmd), "fsck -yf %s", fs->fs_spec);
snprintf(cmd, sizeof(cmd), "fsck -yf %s", mnt->mnt_fsname);
#else
snprintf(cmd, sizeof(cmd), "fsck -a %s", fs->fs_spec);
snprintf(cmd, sizeof(cmd), "fsck -a %s", mnt->mnt_fsname);
#endif
fsck_rc = run_interactive(cmd, "Checking filesystem %.13s", fs->fs_spec);
fsck_rc = run_interactive(cmd, "Checking filesystem %.13s", mnt->mnt_fsname);
/*
* "failure" is defined as exiting with a return code of
* 2 or larger. A return code of 1 indicates that filesystem
@@ -169,7 +170,7 @@ static int fsck(int pass)
rc += fsck_rc;
}
endfsent();
endmntent(fp);
return rc;
}
@@ -202,38 +203,22 @@ static void fs_mount(const char *src, const char *tgt, const char *fstype,
}
#ifndef SYSROOT
/* If / is not listed in fstab, or listed as 'ro', leave it alone */
static int fs_readonly_root(struct fstab *fs)
{
char *tok, *str;
if (!fs)
return 1;
str = fs->fs_mntops;
while ((tok = strtok(str, ","))) {
if (!strcmp(tok, "ro"))
return 1;
str = NULL;
}
return 0;
}
static void fs_remount_root(int fsckerr)
{
struct fstab *fs;
struct mntent *mnt;
FILE *fp;
if (!setfsent())
fp = setmntent("/etc/fstab", "r");
if (!fp)
return;
while ((fs = getfsent())) {
if (!strcmp(fs->fs_file, "/"))
break;
while ((mnt = getmntent(fp))) {
if (strcmp(mnt->mnt_dir, "/"))
continue;
}
if (fs_readonly_root(fs))
/* If / is not listed in fstab, or listed as 'ro', leave it alone */
if (!mnt || hasmntopt(mnt, "ro"))
goto out;
if (fsckerr)
@@ -243,7 +228,7 @@ static void fs_remount_root(int fsckerr)
"Remounting / as read-write");
out:
endfsent();
endmntent(fp);
}
#else
static void fs_remount_root(int fsckerr)