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authorTom Gundersen <teg@jklm.no>2013-02-22 10:52:36 (GMT)
committerTom Gundersen <teg@jklm.no>2013-03-01 21:52:36 (GMT)
commit3d22d1ab57bf44c92e4d9ca95d9728105dd3fb0d (patch)
tree01e8fb92ae5f8cb766c7a37e1aee829397b8c4c2
parentfea9740ae463c409b84a38d2592d434c2875975b (diff)
fstab-generator: initrd - mount selected entries from /sysroot/etc/fstab
We only mount "/usr" and entries marked with "x-initrd.mount". This (together with the right unit files) is needed in the initramfs in order to natively support mounting /usr (and friends) from the initramfs. The way it is meant to work is: * wait for sysroot.mount to be mounted * do a daemon-reload to generate sysroot-usr.mount (++) from /sysroot/etc/fstab * wait for sysroot-usr.mount to be mounted * switch-root Cc: Harald Hoyer <harald.hoyer@gmail.com> Cc: Dave Reisner <d@falconindy.com>
-rw-r--r--src/fstab-generator/fstab-generator.c39
1 files changed, 28 insertions, 11 deletions
diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
index 23a8d79..1a1fe86 100644
--- a/src/fstab-generator/fstab-generator.c
+++ b/src/fstab-generator/fstab-generator.c
@@ -191,6 +191,14 @@ static bool mount_is_network(struct mntent *me) {
fstype_is_network(me->mnt_type);
}
+static bool mount_in_initrd(struct mntent *me) {
+ assert(me);
+
+ return
+ hasmntopt(me, "x-initrd.mount") ||
+ streq(me->mnt_dir, "/usr");
+}
+
static int add_mount(const char *what, const char *where, const char *type, const char *opts,
int passno, bool noauto, bool nofail, bool automount, bool isbind, bool isnetwork,
const char *source) {
@@ -342,13 +350,14 @@ static int add_mount(const char *what, const char *where, const char *type, cons
fprintf(f,
"# Automatically generated by systemd-fstab-generator\n\n"
"[Unit]\n"
- "SourcePath=/etc/fstab\n"
+ "SourcePath=%s\n"
"DefaultDependencies=no\n"
"Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
"Before=" SPECIAL_UMOUNT_TARGET " %s\n"
"\n"
"[Automount]\n"
"Where=%s\n",
+ source,
post,
where);
@@ -373,18 +382,20 @@ static int add_mount(const char *what, const char *where, const char *type, cons
return 0;
}
-static int parse_fstab(void) {
+static int parse_fstab(const char *prefix, bool initrd) {
FILE *f;
+ _cleanup_free_ char *fstab_path = NULL;
int r = 0;
struct mntent *me;
errno = 0;
- f = setmntent("/etc/fstab", "r");
+ fstab_path = strjoin(prefix, "/etc/fstab", NULL);
+ f = setmntent(fstab_path, "r");
if (!f) {
if (errno == ENOENT)
return 0;
- log_error("Failed to open /etc/fstab: %m");
+ log_error("Failed to open %s/etc/fstab: %m", prefix);
return -errno;
}
@@ -392,8 +403,11 @@ static int parse_fstab(void) {
char _cleanup_free_ *where = NULL, *what = NULL;
int k;
+ if (initrd && !mount_in_initrd(me))
+ continue;
+
what = fstab_node_to_udev_node(me->mnt_fsname);
- where = strdup(me->mnt_dir);
+ where = strjoin(prefix, me->mnt_dir, NULL);
if (!what || !where) {
r = log_oom();
goto finish;
@@ -419,7 +433,7 @@ static int parse_fstab(void) {
k = add_mount(what, where, me->mnt_type, me->mnt_opts,
me->mnt_passno, noauto, nofail, automount,
- isbind, isnetwork, "/etc/fstab");
+ isbind, isnetwork, fstab_path);
}
if (k < 0)
@@ -552,7 +566,7 @@ static int parse_proc_cmdline(void) {
}
int main(int argc, char *argv[]) {
- int r, k = 0;
+ int r = 0, k, l = 0;
if (argc > 1 && argc != 4) {
log_error("This program takes three or no arguments.");
@@ -572,12 +586,15 @@ int main(int argc, char *argv[]) {
return EXIT_FAILURE;
if (in_initrd())
- k = parse_new_root_from_proc_cmdline();
+ r = parse_new_root_from_proc_cmdline();
if (!arg_enabled)
- return EXIT_SUCCESS;
+ return (r < 0) ? EXIT_FAILURE : EXIT_SUCCESS;
- r = parse_fstab();
+ k = parse_fstab("", false);
+
+ if (in_initrd())
+ l = parse_fstab("/sysroot", true);
- return (r < 0) || (k < 0) ? EXIT_FAILURE : EXIT_SUCCESS;
+ return (r < 0) || (k < 0) || (l < 0) ? EXIT_FAILURE : EXIT_SUCCESS;
}