chiark / gitweb /
add mount enumerator
authorLennart Poettering <lennart@poettering.net>
Fri, 29 Jan 2010 01:07:41 +0000 (02:07 +0100)
committerLennart Poettering <lennart@poettering.net>
Fri, 29 Jan 2010 01:07:41 +0000 (02:07 +0100)
device.c
load-fragment.c
mount.c
mount.h
unit.c
unit.h

index 22b0f60..6d7e2c6 100644 (file)
--- a/device.c
+++ b/device.c
@@ -33,7 +33,7 @@ static void device_dump(Unit *u, FILE *f, const char *prefix) {
                 prefix, d->sysfs);
 }
 
-static int device_add_escaped_name(Unit *u, const char *dn) {
+static int device_add_escaped_name(Unit *u, const char *prefix, const char *dn, bool make_id) {
         char *e;
         int r;
 
@@ -41,10 +41,14 @@ static int device_add_escaped_name(Unit *u, const char *dn) {
         assert(dn);
         assert(dn[0] == '/');
 
-        if (!(e = unit_name_escape_path(dn+1, ".device")))
+        if (!(e = unit_name_escape_path(prefix, dn+1, ".device")))
                 return -ENOMEM;
 
         r = unit_add_name(u, e);
+
+        if (r >= 0 && make_id)
+                unit_choose_id(u, e);
+
         free(e);
 
         if (r < 0 && r != -EEXIST)
@@ -79,7 +83,7 @@ static int device_process_device(Manager *m, struct udev_device *dev) {
                 return -ENOMEM;
 
         assert(sysfs[0] == '/');
-        if (!(e = unit_name_escape_path(sysfs+1, ".device")))
+        if (!(e = unit_name_escape_path("sysfs-", sysfs+1, ".device")))
                 return -ENOMEM;
 
         if (!(u = manager_get_unit(m, e))) {
@@ -116,12 +120,12 @@ static int device_process_device(Manager *m, struct udev_device *dev) {
         }
 
         if (dn)
-                if ((r = device_add_escaped_name(u, dn)) < 0)
+                if ((r = device_add_escaped_name(u, "node-", dn, true)) < 0)
                         goto fail;
 
         first = udev_device_get_devlinks_list_entry(dev);
         udev_list_entry_foreach(item, first)
-                if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item))) < 0)
+                if ((r = device_add_escaped_name(u, "node-", udev_list_entry_get_name(item), false)) < 0)
                         goto fail;
 
         if (names) {
index 1a334bb..94bdf17 100644 (file)
@@ -647,6 +647,8 @@ static int open_follow(char **filename, FILE **_f, Set *names, char **_id) {
                 if (c++ >= FOLLOW_MAX)
                         return -ELOOP;
 
+                path_kill_slashes(*filename);
+
                 /* Add the file name we are currently looking at to
                  * the names of this unit */
                 name = file_name_from_path(*filename);
@@ -804,12 +806,12 @@ static int load_from_path(Unit *u, const char *path) {
                 if ((r = unit_add_name(u, k)) < 0)
                         goto finish;
 
-                if (id == k)
-                        assert_se(u->meta.id = set_get(u->meta.names, k));
 
                 free(k);
         }
 
+        unit_choose_id(u, id);
+
         free(u->meta.load_path);
         u->meta.load_path = filename;
         filename = NULL;
diff --git a/mount.c b/mount.c
index 7a1ec08..ddf0520 100644 (file)
--- a/mount.c
+++ b/mount.c
@@ -1,12 +1,15 @@
 /*-*- Mode: C; c-basic-offset: 8 -*-*/
 
 #include <errno.h>
+#include <stdio.h>
+#include <mntent.h>
 
 #include "unit.h"
 #include "mount.h"
 #include "load-fragment.h"
 #include "load-fstab.h"
 #include "load-dropin.h"
+#include "log.h"
 
 static int mount_init(Unit *u) {
         int r;
@@ -33,7 +36,8 @@ static void mount_done(Unit *u) {
         Mount *d = MOUNT(u);
 
         assert(d);
-        free(d->path);
+        free(d->what);
+        free(d->where);
 }
 
 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
@@ -52,9 +56,319 @@ static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 
         fprintf(f,
                 "%sMount State: %s\n"
-                "%sPath: %s\n",
+                "%sWhere: %s\n"
+                "%sWhat: %s\n",
                 prefix, state_table[s->state],
-                prefix, s->path);
+                prefix, s->where,
+                prefix, s->what);
+}
+
+static void mount_shutdown(Manager *m) {
+}
+
+static int mount_add_node_links(Mount *m) {
+        Unit *device;
+        char *e;
+        int r;
+
+        assert(m);
+
+        /* Adds in links to the device that this node is based on */
+
+        if (!path_startswith(m->what, "/dev/"))
+                return 0;
+
+        if (!(e = unit_name_escape_path("node-", m->what+1, ".device")))
+                return -ENOMEM;
+
+        r = manager_load_unit(UNIT(m)->meta.manager, e, &device);
+        free(e);
+
+        if (r < 0)
+                return r;
+
+        if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0)
+                return r;
+
+        if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0)
+                return r;
+
+        if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0)
+                return r;
+
+        return 0;
+}
+
+static int mount_add_path_links(Mount *m) {
+        Iterator i;
+        Unit *other;
+        int r;
+
+        /* Adds in link to other mount points, that might lie below or
+         * above us in the hierarchy */
+
+        HASHMAP_FOREACH(other, UNIT(m)->meta.manager->units, i) {
+                Mount *n;
+
+                if (other->meta.type != UNIT_MOUNT)
+                        continue;
+
+                n = MOUNT(other);
+
+                if (path_startswith(m->where, n->where)) {
+
+                        if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, other)) < 0)
+                                return r;
+
+                        if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, other)) < 0)
+                                return r;
+
+                } else if (startswith(n->where, m->where)) {
+
+                        if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, other)) < 0)
+                                return r;
+
+                        if ((r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m))) < 0)
+                                return r;
+                }
+        }
+
+        return 0;
+}
+
+static int mount_add_one(Manager *m, const char *what, const char *where) {
+        char *e;
+        int r;
+        Unit *u;
+        bool delete;
+
+        assert(what);
+        assert(where);
+
+        /* probably some kind of swap, which we don't cover for now */
+        if (where[0] != '/')
+                return 0;
+
+        if (streq(where, "/"))
+                e = strdup("rootfs.mount");
+        else
+                e = unit_name_escape_path("fs-", where+1, ".mount");
+
+        if (!e)
+                return -ENOMEM;
+
+        if (!(u = manager_get_unit(m, e))) {
+                delete = true;
+
+                if (!(u = unit_new(m))) {
+                        free(e);
+                        return -ENOMEM;
+                }
+
+                r = unit_add_name(u, e);
+                free(e);
+
+                if (r < 0)
+                        goto fail;
+
+                if (!(MOUNT(u)->what = strdup(what)) ||
+                    !(MOUNT(u)->where = strdup(where)) ||
+                    !(u->meta.description = strdup(where))) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+        } else {
+                delete = false;
+                free(e);
+        }
+
+        if ((r = mount_add_node_links(MOUNT(u))) < 0)
+                goto fail;
+
+        if ((r = mount_add_path_links(MOUNT(u))) < 0)
+                goto fail;
+
+        unit_add_to_load_queue(u);
+        return 0;
+
+fail:
+        if (delete && u)
+                unit_free(u);
+
+        return 0;
+}
+
+static char *fstab_node_to_udev_node(char *p) {
+        char *dn, *t;
+        int r;
+
+        /* FIXME: to follow udev's logic 100% we need to leave valid
+         * UTF8 chars unescaped */
+
+        if (startswith(p, "LABEL=")) {
+
+                if (!(t = strdup(p+6)))
+                        return NULL;
+
+                r = asprintf(&dn, "/dev/disk/by-label/%s", xescape(t, "/ "));
+                free(t);
+
+                if (r < 0)
+                        return NULL;
+
+                return dn;
+        }
+
+        if (startswith(p, "UUID=")) {
+
+                if (!(t = strdup(p+5)))
+                        return NULL;
+
+                r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(xescape(t, "/ ")));
+                free(t);
+
+                if (r < 0)
+                        return NULL;
+
+                return dn;
+        }
+
+        return strdup(p);
+}
+
+static int mount_load_etc_fstab(Manager *m) {
+        FILE *f;
+        int r;
+        struct mntent* me;
+
+        assert(m);
+
+        errno = 0;
+        if (!(f = setmntent("/etc/fstab", "r")))
+                return -errno;
+
+        while ((me = getmntent(f))) {
+                char *where, *what;
+
+                if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
+                        r = -ENOMEM;
+                        goto finish;
+                }
+
+                if (!(where = strdup(me->mnt_dir))) {
+                        free(what);
+                        r = -ENOMEM;
+                        goto finish;
+                }
+
+                if (what[0] == '/')
+                        path_kill_slashes(what);
+
+                if (where[0] == '/')
+                        path_kill_slashes(where);
+
+                r = mount_add_one(m, what, where);
+                free(what);
+                free(where);
+
+                if (r < 0)
+                        goto finish;
+        }
+
+        r = 0;
+finish:
+
+        endmntent(f);
+        return r;
+}
+
+static int mount_load_proc_mounts(Manager *m) {
+        FILE *f;
+        int r;
+
+        assert(m);
+
+        if (!(f = fopen("/proc/self/mountinfo", "r")))
+                return -errno;
+
+        for (;;) {
+                int k;
+                char *device, *path, *d, *p;
+
+                if ((k = fscanf(f,
+                                "%*s "       /* (1) mount id */
+                                "%*s "       /* (2) parent id */
+                                "%*s "       /* (3) major:minor */
+                                "%*s "       /* (4) root */
+                                "%ms "       /* (5) mount point */
+                                "%*s"        /* (6) mount options */
+                                "%*[^-]"     /* (7) optional fields */
+                                "- "         /* (8) seperator */
+                                "%*s "       /* (9) file system type */
+                                "%ms"       /* (10) mount source */
+                                "%*[^\n]", /* some rubbish at the end */
+                                &path,
+                                &device)) != 2) {
+
+                        if (k == EOF) {
+                                if (feof(f))
+                                        break;
+
+                                r = -errno;
+                                goto finish;
+                        }
+
+                        r = -EBADMSG;
+                        goto finish;
+                }
+
+                if (!(d = cunescape(device))) {
+                        free(device);
+                        free(path);
+                        r = -ENOMEM;
+                        goto finish;
+                }
+                free(device);
+
+                if (!(p = cunescape(path))) {
+                        free(d);
+                        free(path);
+                        r = -ENOMEM;
+                        goto finish;
+                }
+                free(path);
+
+                r = mount_add_one(m, d, p);
+                free(d);
+                free(p);
+
+                if (r < 0)
+                        goto finish;
+        }
+
+        r = 0;
+
+finish:
+        fclose(f);
+
+        return r;
+}
+
+static int mount_enumerate(Manager *m) {
+        int r;
+        assert(m);
+
+        if ((r = mount_load_etc_fstab(m)) < 0)
+                goto fail;
+
+        if ((r = mount_load_proc_mounts(m)) < 0)
+                goto fail;
+
+        return 0;
+
+fail:
+        mount_shutdown(m);
+        return r;
 }
 
 static UnitActiveState mount_active_state(Unit *u) {
@@ -75,8 +389,10 @@ const UnitVTable mount_vtable = {
 
         .init = mount_init,
         .done = mount_done,
-
         .dump = mount_dump,
 
-        .active_state = mount_active_state,
+        .enumerate = mount_enumerate,
+        .shutdown = mount_shutdown,
+
+        .active_state = mount_active_state
 };
diff --git a/mount.h b/mount.h
index 734e96c..5b5d5a3 100644 (file)
--- a/mount.h
+++ b/mount.h
@@ -20,7 +20,8 @@ struct Mount {
         Meta meta;
 
         MountState state;
-        char *path;
+
+        char *what, *where;
 };
 
 extern const UnitVTable mount_vtable;
diff --git a/unit.c b/unit.c
index dbdd7e6..7723393 100644 (file)
--- a/unit.c
+++ b/unit.c
@@ -903,32 +903,41 @@ int set_unit_path(const char *p) {
         return 0;
 }
 
-char *unit_name_escape_path(const char *path, const char *suffix) {
+char *unit_name_escape_path(const char *prefix, const char *path, const char *suffix) {
         char *r, *t;
         const char *f;
-        size_t a, b;
+        size_t a, b, c;
 
         assert(path);
-        assert(suffix);
 
-        /* Takes a path and a util suffix and makes a nice unit name
-         * of it, escaping all weird chars on the way.
+        /* Takes a path and a suffix and prefix and makes a nice
+         * string suitable as unit name of it, escaping all weird
+         * chars on the way.
          *
-         * / becomes _, and all chars not alloweed in a unit name get
-         * escaped as \xFF, including the _ and the \ itself, of
-         * course. This escaping is hence reversible.
+         * / becomes ., and all chars not alloweed in a unit name get
+         * escaped as \xFF, including \ and ., of course. This
+         * escaping is hence reversible.
          */
 
-        a = strlen(path);
-        b = strlen(suffix);
+        if (!prefix)
+                prefix = "";
+
+        if (!suffix)
+                suffix = "";
 
-        if (!(r = new(char, a*4+b+1)))
+        a = strlen(prefix);
+        b = strlen(path);
+        c = strlen(suffix);
+
+        if (!(r = new(char, a+b*4+c+1)))
                 return NULL;
 
-        for (f = path, t = r; *f; f++) {
+        memcpy(r, prefix, a);
+
+        for (f = path, t = r+a; *f; f++) {
                 if (*f == '/')
-                        *(t++) = '_';
-                else if (*f == '_' || *f == '\\' || !strchr(VALID_CHARS, *f)) {
+                        *(t++) = '.';
+                else if (*f == '.' || *f == '\\' || !strchr(VALID_CHARS, *f)) {
                         *(t++) = '\\';
                         *(t++) = 'x';
                         *(t++) = hexchar(*f > 4);
@@ -937,7 +946,7 @@ char *unit_name_escape_path(const char *path, const char *suffix) {
                         *(t++) = *f;
         }
 
-        memcpy(t, suffix, b+1);
+        memcpy(t, suffix, c+1);
 
         return r;
 }
diff --git a/unit.h b/unit.h
index 8505d27..0cd09fe 100644 (file)
--- a/unit.h
+++ b/unit.h
@@ -240,6 +240,6 @@ bool unit_job_is_applicable(Unit *u, JobType j);
 const char *unit_path(void);
 int set_unit_path(const char *p);
 
-char *unit_name_escape_path(const char *path, const char *suffix);
+char *unit_name_escape_path(const char *prefix, const char *path, const char *suffix);
 
 #endif