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-rw-r--r--init/Makefile2
-rw-r--r--init/README.255
-rwxr-xr-xinit/examples/.linuxrc82
-rwxr-xr-xinit/examples/.preinit83
-rw-r--r--init/init.c635
5 files changed, 708 insertions, 149 deletions
diff --git a/init/Makefile b/init/Makefile
index bc1ed4f..8b95b06 100644
--- a/init/Makefile
+++ b/init/Makefile
@@ -1,3 +1,3 @@
OBJS=init mkdev
include ../include/rules.make
-CFLAGS+=-fomit-frame-pointer
+CFLAGS+=-fomit-frame-pointer -Wl,--gc-sections
diff --git a/init/README.2 b/init/README.2
new file mode 100644
index 0000000..f306601
--- /dev/null
+++ b/init/README.2
@@ -0,0 +1,55 @@
+Résumé rapide des commandes les plus courantes :
+
+ - { ... } : bloc d'instructions
+ - &<cmd> : n'exécute CMD que si le retour précédent est OK
+ - |<cmd> : n'exécute CMD que si le retour précédent est ERR
+ - !<cmd> : inverse le code de retour de CMD, et peut être
+ combiné à &,|
+
+ - te VAR=VAL => retourne TRUE si VAR=VAL dans l'env.
+ - in : spécifie l'init auquel on donne la main
+ - ec : echo
+ - rd : passe en mode prompt clavier, en affichant le
+ message. Ne retourne jamais d'erreur. Le prompt
+ compte les niveaux pour s'y retrouver avec les {} :-)
+ - mt : mount ; um : umount
+ - mv : mount --move ; bi : mount --bind
+ - ex : exécute dans un sous-process (system())
+ - rx xxx yyy : execute yyy dans chroot xxx;
+ - md : mkdir ; ln : lien
+ - bl,ch,fi : devices block, char, fifo
+ - pr xxx yyy : pivot_root : root -> xxx/yyy ; xxx->root
+
+
+C'est une conf opérationnelle de boot avec un linuxrc dans un initrd
+et un .preinit sur un CD.
+Par défaut, le kernel charge /sbin/init à partir de l'initrd. Ce dernier
+est un lien qui pointe vers le script /.linuxrc, référençant lui-même
+/linuxrc comme interpréteur. Le résultat est que l'on exécute :
+ /linuxrc < /sbin/init ce qui revient à /linuxrc < /.linuxrc
+
+Il est possible de forcer le chemin de linuxrc par 'init=/xxxxx' au boot.
+
+Ensuite, le script linuxrc monte le CD puis exécute soit /sbin/init, soit
+le nom en regard de la ligne 'in xxxx' dans la conf, soit xxxx si
+'init2=xxxx' est précisé sur la ligne de commande, soit enfin le paramètre
+de 'in' fourni au clavier en mode prompt si "RDSHELL=1" est passé au noyau.
+
+Le /sbin/init du CD utilise par défaut /.preinit (qu'on aurait pu appeler
+en direct par 'init=' venant d'un kernel sans initrd, ou 'init2=' venant
+d'un initrd équipé du linuxrc décrit ci-dessus).
+
+Si le paramètre "RAMCOPY=1" est passé au kernel, alors le script recopie
+tout le CD en RAM, puis le démonte.
+
+Si le paramètre "AUTORUN=1" est passé au kernel, alors il tentera de monter
+une disquette en ext2 puis en fat, pour y exécuter /autorun dans un
+sous-processus.
+
+Si le paramètre "INITSHELL=1" est passé au kernel, alors l'utilisateur
+récupère un prompt.
+
+Enfin, le script transfère l'exécution à /sbin/init-sysv, ou au binaire
+désigné par 'in' dans le script, ou par celui désigné par le paramètre
+"INIT=xxx" passé au kernel.
+
diff --git a/init/examples/.linuxrc b/init/examples/.linuxrc
new file mode 100755
index 0000000..24c7300
--- /dev/null
+++ b/init/examples/.linuxrc
@@ -0,0 +1,82 @@
+#!/linuxrc <
+# mem, kmem, null, zero, random, urandom, tty0, tty, console, ptmx, initctl
+# full, fd
+
+md /var 755
+md /proc 755
+md /cdrom 755
+ln var/tmp /tmp
+
+mt /proc /proc proc rw
+mt /var /var tmpfs rw mode=755
+md /var/tmp 1777
+md /var/run 755
+md /dev/pts 755
+
+bl 0600 0 0 3 0 hd[c,ab,64][I,0-16,1]
+bl 0600 0 0 22 0 hd[c,cd,64][I,0-16,1]
+bl 0600 0 0 33 0 hd[c,ef,64][I,0-16,1]
+bl 0600 0 0 8 0 sd[c,a-h,16][I,0-15,1]
+md /dev/rd 755 # DAC960 raid disks (majors 48-55)
+bl 0600 0 0 48 0 rd/c0d[i,0-31,8]
+bl 0600 0 0 48 1 rd/c0d[i,0-31,8]p[i,1-7,1]
+md /dev/ida 755 # Compaq raid disks (majors 72-79)
+bl 0600 0 0 72 0 ida/c0d[i,0-15,16]
+bl 0600 0 0 72 1 ida/c0d[i,0-15,16]p[i,1-15,1]
+md /dev/cciss 755 # Compaq CCISS raid disks (major 104)
+bl 0600 0 0 104 0 cciss/c0d[i,0-15,16]
+bl 0600 0 0 104 1 cciss/c0d[i,0-15,16]p[i,1-15,1]
+bl 0600 0 0 11 0 sr[i,0-16,1]
+ch 0600 0 0 9 0 st[i,0-15,1]
+bl 0600 0 0 9 0 md[i,0-15,1]
+bl 0600 0 0 2 0 fd0
+bl 0600 0 0 2 28 fd0u1440
+ch 0600 0 5 2 0 pty[c,p-za-f,16][h,0-f,1]
+ch 0600 0 5 3 0 tty[c,p-za-f,16][h,0-f,1]
+ch 0600 0 5 4 1 tty[i,1-12,1]
+bl 0600 0 0 7 0 loop[i,0-9,1]
+bl 0600 0 0 1 0 ram[i,0-9,1]
+ch 0600 0 5 4 64 ttyS[i,0-9,1]
+ch 0600 0 3 10 1 psaux
+bl 0400 0 0 1 250 initrd
+md /dev/input 755
+ch 0600 0 0 13 63 input/mice
+
+ln psaux /dev/mouse
+
+ec "Looking for a valid CDROM."
+ex /sbin/findcdrom
+&{
+ ec "Found! Mounting the CDROM..."
+ mt /dev/cdrom /cdrom iso9660 ro
+ &ec "Done."
+ |ec "Failed."
+}
+|{
+ ec "No CDROM found. You can try by yourself : 'ex /sbin/findcdrom'."
+ ec "Then mount it into /cdrom : 'mt /dev/cdrom /cdrom iso9660 ro'."
+ rd
+}
+
+# we don't need all this anymore.
+um /var
+um /proc
+
+# pivot_root only works on mount points, so we'll fake
+# /cdrom by remounting /cdrom/root into it
+bi /cdrom/root /cdrom
+bi /dev /cdrom/dev
+pr /cdrom mnt/initrd
+|rd "<pr /cdrom mnt/initrd> failed !!! Try by hand..."
+
+um /mnt/initrd/dev
+um /mnt/initrd/cdrom /mnt/cdrom
+um /mnt/initrd
+
+te RDSHELL=1
+&rd "You have requested this prompt by appending RDSHELL=1 to the kernel cmd line."
+
+in /sbin/init
+
+# now we're on the root, and /dev will be unmounted on exit
+
diff --git a/init/examples/.preinit b/init/examples/.preinit
new file mode 100755
index 0000000..fead5ba
--- /dev/null
+++ b/init/examples/.preinit
@@ -0,0 +1,83 @@
+#!/sbin/init <
+# mem, kmem, null, zero, random, urandom, tty0, tty, console, ptmx, initctl
+# full, fd
+mt /proc /proc proc rw
+mt /var /var tmpfs rw mode=755
+md /var/tmp 1777
+md /var/run 755
+md /dev/pts 755
+
+bl 0600 0 0 3 0 hd[c,ab,64][I,0-16,1]
+bl 0600 0 0 22 0 hd[c,cd,64][I,0-16,1]
+bl 0600 0 0 33 0 hd[c,ef,64][I,0-16,1]
+bl 0600 0 0 8 0 sd[c,a-h,16][I,0-15,1]
+md /dev/rd 755 # DAC960 raid disks (majors 48-55)
+bl 0600 0 0 48 0 rd/c0d[i,0-31,8]
+bl 0600 0 0 48 1 rd/c0d[i,0-31,8]p[i,1-7,1]
+md /dev/ida 755 # Compaq raid disks (majors 72-79)
+bl 0600 0 0 72 0 ida/c0d[i,0-15,16]
+bl 0600 0 0 72 1 ida/c0d[i,0-15,16]p[i,1-15,1]
+md /dev/cciss 755 # Compaq CCISS raid disks (major 104)
+bl 0600 0 0 104 0 cciss/c0d[i,0-15,16]
+bl 0600 0 0 104 1 cciss/c0d[i,0-15,16]p[i,1-15,1]
+bl 0600 0 0 11 0 sr[i,0-16,1]
+ch 0600 0 0 9 0 st[i,0-15,1]
+bl 0600 0 0 9 0 md[i,0-15,1]
+bl 0600 0 0 2 0 fd0
+bl 0600 0 0 2 28 fd0u1440
+ch 0600 0 5 2 0 pty[c,p-za-f,16][h,0-f,1]
+ch 0600 0 5 3 0 tty[c,p-za-f,16][h,0-f,1]
+ch 0600 0 5 4 1 tty[i,1-12,1]
+bl 0600 0 0 7 0 loop[i,0-9,1]
+bl 0600 0 0 1 0 ram[i,0-9,1]
+ch 0600 0 5 4 64 ttyS[i,0-9,1]
+ch 0600 0 3 10 1 psaux
+ch 0600 0 0 10 144 nvram
+ch 0600 0 0 10 130 watchdog
+bl 0400 0 0 1 250 initrd
+ch 0600 0 0 14 0 mixer
+ch 0600 0 0 14 3 dsp
+md /dev/input 755
+ch 0600 0 0 13 63 input/mice
+md /dev/fs 755
+
+ln psaux /dev/mouse
+
+te RAMCOPY=1
+&{
+ ec "Copying whole RootFS to RAM (can take a while)..."
+ mt / /mnt/initrd tmpfs rw size=33554432
+ &ex /bin/cp -dRfpx / /mnt/initrd
+ &{
+ bi /proc /mnt/initrd/proc
+ bi /var /mnt/initrd/var
+ bi /dev /mnt/initrd/dev
+ pr /mnt/initrd mnt/initrd # move mnt/initrd to /, and / to the new /mnt/initrd
+ um /mnt/initrd/dev
+ um /mnt/initrd/proc
+ um /mnt/initrd/var
+ um /mnt/initrd
+ ec "RootFS now running from RAM."
+ }
+ |{
+ um /mnt/initrd
+ ec "Failed to copy the RootFS into RAM."
+ }
+}
+
+te AUTORUN=1
+&{
+ mt /dev/fd0 /mnt/floppy ext2 ro
+ |mt /dev/fd0 /mnt/floppy vfat ro
+ &{
+ ex /mnt/floppy/autorun
+ um /mnt/floppy
+ }
+ |ec "Could not find an autorun file on the floppy disk."
+}
+
+te INITSHELL=1
+&rd "You have requested this prompt by appending INITSHELL=1 to the kernel cmd line."
+
+in /sbin/init-sysv
+
diff --git a/init/init.c b/init/init.c
index 4593a40..9204f62 100644
--- a/init/init.c
+++ b/init/init.c
@@ -158,6 +158,16 @@ wrong for now:
#include <sys/stat.h>
#include <linux/loop.h>
+#ifndef MNT_DETACH
+#define MNT_DETACH 2
+#endif
+
+#ifndef MS_MOVE
+#define MS_MOVE 8192
+#endif
+
+#define STR_SECT ".rodata"
+
#ifdef DEBUG
static void print(char *c) {
char *p = c;
@@ -174,32 +184,41 @@ static void print(char *c) {
typedef unsigned char uchar;
-extern char **environ;
-
-static const char cfg_fname[] = "/.preinit"; /* configuration file */
-static const char tmpfs_fs[] = "tmpfs";
-static const char dev_console[] = "dev/console";
-static const char dev_root[] = "dev/root";
-static const char dev_name[] = "/dev";
-static const char root_dir[] = "/";
-static const char var_dir[] = "/var";
-static const char var_run[] = "/var/run";
-static const char var_tmp[] = "/var/tmp";
-static const char proc_dir[] = "/proc";
-static const char proc_self_fd[] = "/proc/self/fd";
-static const char proc_cmdline[] = "/proc/cmdline";
-static const char sbin_init_sysv[] = "sbin/init-sysv";
-static const char str_rebuild[] = "rebuild";
-static const char dev_options[] = "size=0,nr_inodes=4096,mode=755";
-
-#define tmp_name (var_tmp + 4) //static const char tmp_name[] = "/tmp";
-#define proc_fs (proc_dir+1) //static const char proc_fs[] = "proc";
-#define fd_dir (proc_self_fd + 11) //static const char fd_dir[] = "fd";
-#define UID_ROOT 0
-#define GID_ROOT 0
-#define GID_TTY 5
-#define GID_KMEM 9
+/* this ordering is awful but it's the most efficient regarding space wasted in
+ * long strings alignment with gcc-2.95.3 (gcc 3.2.3 doesn't try to align long
+ * strings).
+ */
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) msg_ent_console[] = "Entering command line mode : enter one command per line, end with '.'\n";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) root_dir[] = "/";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) cur_dir[] = ".";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) dev_name[] = "/dev";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) var_dir[] = "/var";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) cfg_fname[] = "/.preinit"; /* configuration file */
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) msg_err_console[] = "Command ignored, input alread bound to console !\n";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) dev_console[] = "dev/console";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) str_rebuild[] = "rebuild";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) var_tmp[] = "/var/tmp";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) var_run[] = "/var/run";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) proc_self_fd[] = "/proc/self/fd";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) proc_cmdline[] = "/proc/cmdline";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) sbin_init[] = "sbin/init";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) sbin_init_sysv[] = "sbin/init-sysv";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) cfg_linuxrc[] = "/.linuxrc";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) str__linuxrc[] = "/linuxrc";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) dev_options[] = "size=0,nr_inodes=4096,mode=755";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) proc_dir[] = "/proc";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) tmpfs_fs[] = "tmpfs";
+static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) dev_root[] = "dev/root";
+
+
+#define tmp_name (var_tmp + 4) // static const char tmp_name[] = "/tmp";
+#define proc_fs (proc_dir+1) // static const char proc_fs[] = "proc";
+#define fd_dir (proc_self_fd + 11) // static const char fd_dir[] = "fd";
+#define str_linuxrc (str__linuxrc+1) // "linuxrc"
+
+
+#define CONST_STR(x) ({ static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) ___str___[]=x; (char *)___str___; })
/* used by naming rules */
#define MAX_FIELDS 8
@@ -207,6 +226,7 @@ static const char dev_options[] = "size=0,nr_inodes=4096,mode=755";
#define MAX_CFG_SIZE 4096
#define MAX_CFG_ARGS 16
#define MAX_CMDLINE_LEN 512
+#define MAX_BRACE_LEVEL 10
struct dev_varstr {
char type;
@@ -226,30 +246,6 @@ struct dev_varstr {
uchar scale;
};
-static const struct {
- char name[8];
- short gid;
- char major, minor;
- mode_t mode; /* mode + S_IFCHR, S_IFBLK, S_IFIFO */
-} dev_nodes[] = {
- /* console must always be at the first location */
- { "console", GID_TTY, 5, 1, 0600 | S_IFCHR },
- { "mem", GID_KMEM, 1, 1, 0640 | S_IFCHR },
- { "kmem", GID_KMEM, 1, 2, 0640 | S_IFCHR },
- { "null", GID_ROOT, 1, 3, 0666 | S_IFCHR },
- { "port", GID_KMEM, 1, 4, 0640 | S_IFCHR },
- { "zero", GID_ROOT, 1, 5, 0666 | S_IFCHR },
- { "full", GID_ROOT, 1, 7, 0666 | S_IFCHR },
- { "random", GID_ROOT, 1, 8, 0644 | S_IFCHR },
- { "urandom", GID_ROOT, 1, 9, 0644 | S_IFCHR },
- { "tty0", GID_TTY, 4, 0, 0600 | S_IFCHR },
- { "tty", GID_TTY, 5, 0, 0666 | S_IFCHR },
- { "ptmx", GID_TTY, 5, 2, 0666 | S_IFCHR },
- { "initctl", GID_ROOT, 0, 0, 0600 | S_IFIFO },
-};
-
-#define NB_TOKENS 15
-
enum {
TOK_LN = 0, /* ln : make a symlink */
TOK_MD, /* md : mkdir */
@@ -262,21 +258,31 @@ enum {
TOK_FI, /* fi : make a fifo */
TOK_MA, /* ma : set umask */
TOK_PR, /* pr : pivot root */
- TOK_MV, /* mv : move */
- TOK_UM, /* um : umount */
+ TOK_MV, /* mv : move a filesystem */
+ TOK_BI, /* bi : bind a directory */
+ TOK_UM, /* um : umount a filesystem */
TOK_LO, /* lo : losetup */
TOK_EC, /* ec : echo */
+ TOK_TE, /* te : test an environment variable */
+ TOK_RD, /* rd : read a command from the console */
+ TOK_OB, /* { : begin a command block */
+ TOK_CB, /* } : end a command block */
+ TOK_DOT, /* . : end of config */
TOK_UNK, /* unknown command */
TOK_EOF, /* end of file */
+ TOK_COND_NEG = 0x20, /* negate the result before evaluation */
TOK_COND_OR = 0x40, /* conditionnal OR */
TOK_COND_AND = 0x80, /* conditionnal AND */
- TOK_COND = 0xc0, /* any condition */
+ TOK_COND = 0xE0, /* any condition */
};
+/* counts from TOK_LN to TOK_DOT */
+#define NB_TOKENS 21
+
/* this contains all two-chars command, 1-char commands, followed by a token
* number.
*/
-static const struct {
+static const __attribute__ ((__section__(STR_SECT),__aligned__(1))) struct {
char lcmd[2]; /* long form */
char scmd; /* short form */
char minargs; /* min #args */
@@ -293,11 +299,44 @@ static const struct {
"ma", 'U', 1, /* TOK_MA */
"pr", 'P', 2, /* TOK_PR */
"mv", 'K', 2, /* TOK_MV */
+ "bi", 'K', 2, /* TOK_BI */
"um", 'O', 1, /* TOK_UM */
"lo", 'l', 2, /* TOK_LO */
"ec", 0, 0, /* TOK_EC */
+ "te", 0, 1, /* TOK_TE */
+ "rd", 0, 0, /* TOK_RD */
+ "{", '{', 0, /* TOK_OB */
+ "}", '}', 0, /* TOK_CB */
+ ".", '.', 0, /* TOK_DOT : put every command before this one */
};
+#define UID_ROOT 0
+#define GID_ROOT 0
+#define GID_TTY 5
+#define GID_KMEM 9
+
+static const __attribute__ ((__section__(STR_SECT),__aligned__(1))) struct {
+ char name[8];
+ short gid;
+ char major, minor;
+ mode_t mode; /* mode + S_IFCHR, S_IFBLK, S_IFIFO */
+} dev_nodes[] = {
+ /* console must always be at the first location */
+ { "console", GID_TTY, 5, 1, 0600 | S_IFCHR },
+ { "mem", GID_KMEM, 1, 1, 0640 | S_IFCHR },
+ { "kmem", GID_KMEM, 1, 2, 0640 | S_IFCHR },
+ { "null", GID_ROOT, 1, 3, 0666 | S_IFCHR },
+ { "port", GID_KMEM, 1, 4, 0640 | S_IFCHR },
+ { "zero", GID_ROOT, 1, 5, 0666 | S_IFCHR },
+ { "full", GID_ROOT, 1, 7, 0666 | S_IFCHR },
+ { "random", GID_ROOT, 1, 8, 0644 | S_IFCHR },
+ { "urandom", GID_ROOT, 1, 9, 0644 | S_IFCHR },
+ { "tty0", GID_TTY, 4, 0, 0600 | S_IFCHR },
+ { "tty", GID_TTY, 5, 0, 0666 | S_IFCHR },
+ { "ptmx", GID_TTY, 5, 2, 0666 | S_IFCHR },
+ { "initctl", GID_ROOT, 0, 0, 0600 | S_IFIFO },
+} ;
+
static char cfg_data[MAX_CFG_SIZE];
static char *cfg_args[MAX_CFG_ARGS];
static char *cfg_line;
@@ -306,6 +345,11 @@ static char *cst_str[MAX_FIELDS];
static char *var_str[MAX_FIELDS];
static struct dev_varstr var[MAX_FIELDS];
static int error; /* an error has emerged from last operation */
+static int linuxrc; /* non-zero if we were called as 'linuxrc' */
+
+/* the two input modes */
+#define INPUT_FILE 0
+#define INPUT_KBD 1
static unsigned long my_atoul(const char *s) {
unsigned long res = 0;
@@ -450,23 +494,39 @@ static inline int read_cfg(char *cfg_file) {
* TOK_EOF if nothing left. All args are copied into <cfg_args> as an array
* of pointers. Maximum line length is 256 chars and maximum args number is 15.
*/
-static int parse_cfg() {
+static int parse_cfg(char **cfg_data) {
int nbargs;
int token;
int cond;
+ char *cfg_line = *cfg_data;
memset(cfg_args, 0, sizeof(cfg_args));
while (*cfg_line) {
char c, *p = cfg_line;
+ cond = 0;
/* search beginning of line */
- while (*p == ' ' || *p == '\t' || *p == '\n' || *p == '\r')
+ do {
+ if (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\r') {
+ if (*p == '|') {
+ cond |= TOK_COND_OR;
+ } else if (*p == '&') {
+ cond |= TOK_COND_AND;
+ } else if (*p == '!') {
+ cond ^= TOK_COND_NEG;
+ } else {
+ /* catches any printable char and the final zero */
+ break;
+ }
+ }
p++;
+ } while (1);
/* now search end of line */
cfg_line = p;
- while (*cfg_line && *cfg_line != '#' && *cfg_line != '\n' && *cfg_line != '\r')
+ while (*cfg_line && *cfg_line != '#' && *cfg_line != '\n' && *cfg_line != '\r') {
cfg_line++;
+ }
/* terminate the line cleanly to avoid further tests */
while (c = *cfg_line) {
@@ -475,37 +535,39 @@ static int parse_cfg() {
break;
}
+ /* update the caller's pointer once for all. */
+ *cfg_data = cfg_line;
+
/* skip empty lines */
if (!*p)
continue;
-
- if (*p == '|') {
- cond = TOK_COND_OR;
- p++;
- }
- else if (*p == '&') {
- cond = TOK_COND_AND;
- p++;
- }
- else
- cond = 0;
/* fills the cfg_args[] array with the command itself, followed by all
- * args.
+ * args. cfg_args[last+1]=NULL.
*/
for (nbargs = 0; *p && (nbargs < MAX_CFG_ARGS - 1); nbargs++) {
- int backslash = 0;
+ int backslash = 0, quote = 0;
cfg_args[nbargs] = p;
do {
if (backslash) {
backslash = 0;
+ if (*p == 'n')
+ *p = '\n';
+ else if (*p == 'r')
+ *p = '\r';
+ else if (*p == 't')
+ *p = '\t';
memmove(p - 1, p, cfg_line - p);
- }
- else {
+ } else {
backslash = (*p == '\\');
- p++;
+ if (*p == '"') {
+ memmove(p, p + 1, cfg_line - p - 1);
+ quote = !quote;
+ }
+ else
+ p++;
}
- } while (*p && (backslash || (*p != ' ' && *p != '\t')));
+ } while (*p && (backslash || quote || (*p != ' ' && *p != '\t')));
if (*p) {
*p = 0;
do p++; while (*p == ' ' || *p == '\t');
@@ -527,8 +589,10 @@ static int parse_cfg() {
return TOK_EOF;
}
-/* makes a dev entry */
+/* makes a dev entry. continues on error, but reports them. */
static inline int mknod_chown(mode_t mode, uid_t uid, gid_t gid, uchar major, uchar minor, char *name) {
+ int error;
+
if (mknod(name, mode, makedev(major, minor)) == -1) {
error = 1;
print("init/error : mknod("); print(name); print(") failed\n");
@@ -538,6 +602,8 @@ static inline int mknod_chown(mode_t mode, uid_t uid, gid_t gid, uchar major, uc
error = 1;
print("init/error : chown("); print(name); print(") failed\n");
}
+
+ return error;
}
/* breaks a 3-fields, comma-separated string into 3 fields */
@@ -861,16 +927,49 @@ static mode_t a2mode(char *ascii) {
return m;
}
-int main(int argc, char **argv) {
+int main(int argc, char **argv, char **envp) {
int old_umask;
int pid1, err;
int cfg_ok;
int rebuild;
int token;
+ int cmd_input = INPUT_FILE;
+ static char cmd_line[256]; /* one line of config from the prompt */
struct stat statf;
char *cmdline_arg;
char *cfg_file;
+ int brace_level, kbd_level, run_level;
+ struct {
+ int error;
+ int cond;
+ } context[MAX_BRACE_LEVEL];
+
+ /* first, we'll check if we have been called as 'linuxrc', used only in
+ initrd. In this particular case, we ignore all arguments and use
+ /.linuxrc as a configuration file.
+ */
+
+#ifdef DEBUG
+ print("argv[0]: "); print(argv[0]); print("\n");
+ sleep(1);
+#endif
+ /* if we are called as "linuxrc" or "/linuxrc", then we work a bit
+ * differently : /dev is unmounted at the end, and we proceed even if the
+ * pid is not 1.
+ *
+ * Warning: for an unknown reason (isolinux, kernel?) specifying
+ * 'init=/linuxrc' or 'init=linuxrc' on the command line doesn't work
+ * because 'init' is set in argv[0] ! But setting it by hand works,
+ * so does 'init=/.linuxrc'. Rather strange. So the best solution is
+ * to link /sbin/init to /.linuxrc so that the interpreter's name is
+ * used even if nothing is specified.
+ */
+ if (!strcmp(argv[0], str_linuxrc) || !strcmp(argv[0], str__linuxrc)) {
+ linuxrc = 1;
+ rebuild = 0;
+ pid1 = 0;
+ }
/* check if a config file name has been given to preinit : init [ \< <cfg_file> ] [ init args ] */
if (argc > 2 && *argv[1] == '<') {
cfg_file = argv[2];
@@ -879,28 +978,40 @@ int main(int argc, char **argv) {
argc -= 2;
}
else
- cfg_file = (char *)cfg_fname;
+ cfg_file = linuxrc ? (char *)cfg_linuxrc : (char *)cfg_fname;
- /* restore the correct name. Warning: in the case where init is launched
- * from userspace, the config file is not read again so only the hardcoded
- * name will be used for the executable name.
- */
- *argv = &sbin_init_sysv;/*"sbin/init-sysv"*/;
- old_umask = umask(0);
+ if (!linuxrc) {
+ /*FIXME*/
+ /* restore the correct name. Warning: in the case where init is launched
+ * from userspace, the config file is not read again so only the hardcoded
+ * name will be used for the executable name.
+ */
+ *argv = (char *)&sbin_init_sysv; /*"sbin/init-sysv"*/;
+ /* if "rebuild" is passed as the only argument, then we'll try to rebuild a
+ * full /dev even if not pid==1, but only if it was not already populated
+ */
+ rebuild = (argc == 2 && streq(argv[1], str_rebuild/*"rebuild"*/));
+ pid1 = (getpid() == 1);
+ }
+ else {
+ *argv = (char *)&sbin_init; /* "sbin/init" */
+ }
- /* if "rebuild" is passed as the only argument, then we'll try to rebuild a
- * full /dev even if not pid==1, but only if it was not already populated
- */
- rebuild = (argc == 2 && streq(argv[1], str_rebuild/*"rebuild"*/));
+ if (pid1 || linuxrc) {
+ setsid();
+ }
- pid1 = (getpid() == 1) /*|| 1*/;
+ old_umask = umask(0);
cfg_ok = (read_cfg(cfg_file) == 0);
chdir(root_dir); /* be sure not to stay under /dev ! */
/* do nothing if we're not called as the first process */
- if (pid1 || rebuild) {
- /* check if /dev is already populated : /dev/console should exist */
- if (stat(dev_console, &statf) == -1) {
+ if (pid1 || linuxrc || rebuild) {
+ /* check if /dev is already populated : /dev/console should exist. We
+ * can safely ignore and overwrite /dev in case of linuxrc, reason why
+ * we don't test the presence of /dev/console.
+ */
+ if (linuxrc || stat(dev_console, &statf) == -1) {
print("init/info: /dev/console not found, rebuilding /dev.\n");
if (mount(dev_name, dev_name, tmpfs_fs, MS_MGC_VAL, dev_options) == -1)
print("init/err: cannot mount /dev.\n");
@@ -923,13 +1034,13 @@ int main(int argc, char **argv) {
*/
reopen_console();
}
- }
- else {
- if (!pid1) {
- /* we don't want to rebuild anything else if pid is not 1 */
- print("init/info: /dev is OK.\n");
- return 0;
- }
+ } else if (!pid1) {
+ /* we don't want to rebuild anything else if pid is not 1 */
+#ifdef DEBUG
+ print("init/info: /dev is OK.\n");
+ sleep(10);
+#endif
+ return 0;
}
/* if /dev/root is non-existent, we'll try to make it now */
@@ -950,13 +1061,70 @@ int main(int argc, char **argv) {
/* here, the cwd is still "/" */
if (cfg_ok) {
- while ((token = parse_cfg()) != TOK_EOF) {
+ print("ready to parse file : "); print(cfg_file); print("\n");
+
+ run_level = brace_level = 0;
+ context[brace_level].error = 0;
+ context[brace_level].cond = 0;
+
+ /* main parsing loop */
+ while (1) {
int cond = 0;
- int lasterr = error;
+ if (cmd_input == INPUT_KBD) {
+ int len;
+ char *cmd_ptr = cmd_line;
+ static char prompt[MAX_BRACE_LEVEL + 4];
+ char *p = prompt;
+ int lev1, lev2;
+
+ p += my_strlcpy(p, error ? CONST_STR("ER\n>") : CONST_STR("OK\n>"), 5);
+
+ lev1 = run_level;
+ lev2 = brace_level;
+ while (lev1) {
+ *p++ = '>';
+ lev1--;
+ lev2--;
+ }
+ if (lev2) {
+ *p++ = '{';
+ while (lev2--)
+ *p++ = '>';
+ *p++ = '}';
+ }
+ *p++ = ' ';
+ write(1, prompt, p-prompt);
+
+ len = read(0, cmd_line, sizeof(cmd_line)-1);
+ if (len > 0) {
+ cmd_line[len] = 0;
+ token = parse_cfg(&cmd_ptr);
+ if (token == TOK_EOF) /* empty line */
+ continue;
+ } else {
+ token = TOK_DOT;
+ }
+
+ if (token == TOK_DOT) {
+ cmd_input = INPUT_FILE;
+ brace_level = kbd_level;
+ /* if it was not right, 'rd' would not have been called : */
+ run_level = brace_level;
+ /* don't report prompt errors to the rest of the config ! */
+ error = 0;
+ }
+ }
+
+ if (cmd_input == INPUT_FILE) {
+ token = parse_cfg(&cfg_line);
+ if (token == TOK_EOF || token == TOK_DOT)
+ break;
+ }
+
if (token == TOK_UNK) {
print("unknown command.\n");
- break;
+ continue;
}
cond = token & TOK_COND;
@@ -964,27 +1132,152 @@ int main(int argc, char **argv) {
if (cfg_args[tokens[token].minargs] == NULL) {
print("Missing args\n");
- break;
+ continue;
}
- /* skip conditionnal executions if unneeded */
- if ((cond & TOK_COND_OR) && (!lasterr) ||
- (cond & TOK_COND_AND) && (lasterr))
- continue;
-
/* now we can reset the error */
+ context[brace_level].error = error;
error = 0;
- /* the first command set is always available */
+ if (token == TOK_CB) { /* closing brace */
+ if (cond & TOK_COND) {
+ print("Conditions not permitted with a closing brace.\n");
+ /* we close the brace anyway, ignoring the condition. */
+ } else if (brace_level == 0) {
+ print("Too many closing braces.\n");
+ error = context[brace_level].error;
+ continue;
+ }
+ /* transmit the current error to the upper level, and restore the upper
+ * condition to know if we had to negate the result or not.
+ */
+ error = context[brace_level--].error;
+ cond = context[brace_level].cond;
+ if (run_level > brace_level)
+ run_level = brace_level;
+ goto finish_cmd;
+ }
+ else if (token == TOK_OB) { /* opening brace */
+ if (brace_level == MAX_BRACE_LEVEL - 1) {
+ print("Too many brace levels.\n");
+ error = context[brace_level].error;
+ break;
+ }
+
+ /* if this block should not be executed because of a particular
+ * condition, we'll mark the new level to be skipped, so that
+ * other braces are correctly counted but not evaluated.
+ */
+ if ((run_level == brace_level) &&
+ (!(cond & TOK_COND_OR) || context[brace_level].error) &&
+ (!(cond & TOK_COND_AND) || !context[brace_level].error)) {
+ /* save the current condition to properly handle a negation.
+ * The error code has already been set to 0.
+ */
+ context[brace_level++].cond = cond;
+ run_level = brace_level;
+ }
+ else {
+ /* the braces will not be evaluated because a & or | prevents
+ * it to do so. Since we want to be able to chain these
+ * expressions to do if/then/else with &{}|{}, we'll propagate
+ * the current error code and void the condition.
+ */
+ error = context[brace_level].error;
+ context[brace_level++].cond = 0;
+ }
+ continue;
+ }
+
+ //printf("parsing intruction <%s %s...> at level %d (%d)\n", cfg_args[0], cfg_args[1], brace_level, run_level);
+ /* skip conditionnal executions if they cannot change the error status,
+ * as well as blocks of code excluded from the evaluation
+ */
+ if ((cond & TOK_COND_OR) && !context[brace_level].error ||
+ (cond & TOK_COND_AND) && context[brace_level].error ||
+ (run_level < brace_level)) {
+ error = context[brace_level].error;
+ continue;
+ }
+
+
+ /*
+ * Now we begin to parse the 'real' commands. The first set is always available
+ */
+
if (token == TOK_IN) {
- /* I <path> : specify the path to init */
+ /* I | in <path> : specify the path to init.
+ * Problem: what to do with init args ?
+ * We could pass ours, but if init is replaced with a
+ * shell, this one might be called with 'auto'...
+ * So we flush them all.
+ */
print("<I>nit : used config name for init\n");
- *argv = cfg_args[1];
+ argv[0] = cfg_args[1];
+ argv[1] = NULL;
+
+ /* in keyboard mode, specifying init stops any further parsing,
+ * so that the rest of the config file can be skipped.
+ */
+ if (cmd_input == INPUT_KBD)
+ break;
+ else {
+ /* non sense to switch error status when assigning init */
+ error = context[brace_level].error;
+ continue;
+ }
+ //} else if (token == TOK_EC) {
+ /* ec <string> : echo a string */
+ //int l = strlen(cfg_args[1]);
+ //cfg_args[1][l] = '\n';
+ //write(1, cfg_args[1], l + 1);
+ //goto finish_cmd;
+ } else if (token == TOK_RD || token == TOK_EC) {
+ /* ec <string> : echo a string */
+ /* rd <string> : display message then read commands from the console instead of the file */
+ char *msg;
+ int len;
+
+ if (cfg_args[1] != NULL) {
+ len = strlen(cfg_args[1]);
+ cfg_args[1][len] = '\n';
+ write(1, cfg_args[1], len + 1);
+ }
+ if (token != TOK_RD)
+ goto finish_cmd;
+
+ if (cmd_input == INPUT_KBD) {
+ msg = (char *)msg_err_console;
+ len = sizeof(msg_err_console) - 1;
+ } else {
+ msg = (char *)msg_ent_console;
+ len = sizeof(msg_ent_console) - 1;
+ kbd_level = brace_level;
+ }
+ error = context[brace_level].error;
+ write(1, msg, len);
+ cmd_input = INPUT_KBD;
continue;
- }
+ } else if (token == TOK_TE) {
+ /* te <var=val> : compare an environment variable to a value.
+ * In fact, look for the exact assignment in the environment.
+ * The result is OK if found, NOK if not.
+ */
+ char **env = envp;
+ while (*env) {
+ //printf("testing <%s> against <%s>\n", cfg_args[1], *env);
+ if (!strcmp(*env, cfg_args[1]))
+ break;
+ env++;
+ }
+ error = (*env == NULL);
+ goto finish_cmd;
+ }
- if (!pid1 && !rebuild) { /* other options are reserved for pid 1 only or rebuild mode */
+ /* other options are reserved for pid 1/linuxrc/rebuild and prompt mode */
+ if (!pid1 && !linuxrc && !rebuild && cmd_input != INPUT_KBD) {
print("Command ignored since pid not 1\n");
+ error = context[brace_level].error;
continue;
}
@@ -996,14 +1289,14 @@ int main(int argc, char **argv) {
error = 1;
print("<D>irectory : mkdir() failed\n");
}
- continue;
+ goto finish_cmd;
case TOK_LN:
/* L from to : make a symlink */
if (symlink(cfg_args[1], cfg_args[2]) == -1) {
error = 1;
print("<S>ymlink : symlink() failed\n");
}
- continue;
+ goto finish_cmd;
case TOK_BL:
/* B <mode> <uid> <gid> <major> <minor> <naming rule> : build a block device */
case TOK_CH:
@@ -1011,38 +1304,33 @@ int main(int argc, char **argv) {
if (chdir(dev_name) == -1) {
print("<B>lock_dev/<C>har_dev : cannot chdir(/dev)\n");
error = 1;
- continue;
+ goto finish_cmd;
}
multidev(a2mode(cfg_args[1]) | ((token == TOK_BL) ? S_IFBLK : S_IFCHR),
(uid_t)ATOL(cfg_args[2]), (gid_t)ATOL(cfg_args[3]),
ATOL(cfg_args[4]), ATOL(cfg_args[5]), cfg_args[6]);
chdir(root_dir);
- continue;
+ goto finish_cmd;
case TOK_FI:
/* F <mode> <uid> <gid> <name> : build a fifo */
if (chdir(dev_name) == -1) {
- error = 1;
print("<F>ifo : cannot chdir(/dev)\n");
+ error = 1;
+ goto finish_cmd;
}
- mknod_chown(a2mode(cfg_args[1]) | S_IFIFO,
- (uid_t)ATOL(cfg_args[2]), (gid_t)ATOL(cfg_args[3]),
- 0, 0, cfg_args[4]);
-
+ error = mknod_chown(a2mode(cfg_args[1]) | S_IFIFO,
+ (uid_t)ATOL(cfg_args[2]), (gid_t)ATOL(cfg_args[3]),
+ 0, 0, cfg_args[4]);
chdir(root_dir);
- continue;
- case TOK_EC: {
- /* ec <string> : echo a string */
- int l = strlen(cfg_args[1]);
- cfg_args[1][l] = '\n';
- write(1, cfg_args[1], l + 1);
- continue;
- }
+ goto finish_cmd;
} /* end of switch() */
- if (!pid1) { /* other options are reserved for pid 1 only */
+ /* other options are reserved for pid 1/linuxrc/prompt mode only */
+ if (!pid1 && !linuxrc && cmd_input != INPUT_KBD) {
print("Command ignored since pid not 1\n");
+ error = context[brace_level].error;
continue;
}
@@ -1096,7 +1384,7 @@ int main(int argc, char **argv) {
}
mntarg = MS_RDONLY;
- if (cfg_args[4] != NULL && streq(cfg_args[4], "rw")) {
+ if (cfg_args[4] != NULL && streq(cfg_args[4], CONST_STR("rw"))) {
print("<M>ount : 'rw' flag found, mounting read/write\n");
mntarg &= ~MS_RDONLY;
}
@@ -1131,7 +1419,7 @@ int main(int argc, char **argv) {
res = fork();
if (res == 0) {
chroot(exec_dir);
- execve(exec_args[0], exec_args, environ);
+ execve(exec_args[0], exec_args, envp);
print("<E>xec(child) : execve() failed\n");
return 1;
}
@@ -1140,7 +1428,7 @@ int main(int argc, char **argv) {
while (wait(&error) != res)
print("<E>xec(parent) : signal received\n");
- error = !WIFEXITED(error);
+ error = (WIFEXITED(error) > 0) ? WEXITSTATUS(error) : 1;
print("<E>xec(parent) : child exited\n");
}
else {
@@ -1160,12 +1448,12 @@ int main(int argc, char **argv) {
print("<P>ivot : error during chdir(new root)\n");
}
- if (pivot_root(".", cfg_args[2]) == -1) {
+ if (pivot_root(/*CONST_STR(".")*/cur_dir, cfg_args[2]) == -1) {
error = 1;
print("<P>ivot : error during pivot_root()\n");
}
- chroot(".");
+ chroot(cur_dir/*CONST_STR(".")*/);
if (chdir(root_dir) == -1) {
error = 1;
print("<P>ivot : error during chdir(/)\n");
@@ -1175,15 +1463,27 @@ int main(int argc, char **argv) {
reopen_console();
break;
case TOK_MV:
- /* K <old_dir> <new_dir> : keep directory <old_dir> after a pivot. */
+ /* K | mv <fs_dir> <new_dir> :
+ * initially used to keep directory <old_dir> after a pivot, now used to
+ * move a filesystem to another directory.
+ */
+ if (mount(cfg_args[1], cfg_args[2], cfg_args[1], MS_MGC_VAL | MS_MOVE, NULL) == 0)
+ break;
+ /* if it doesn't work, we'll try to cheat with BIND/UMOUNT */
+ case TOK_BI:
+ /* bi <old_dir> <new_dir> : bind old_dir to new_dir, which means that directory
+ * <new_dir> will show the same contents as <old_dir>.
+ */
if (mount(cfg_args[1], cfg_args[2], cfg_args[1], MS_MGC_VAL | MS_BIND, NULL) == -1) {
error = 1;
- print("<mv> : error during mount\n");
+ print("<bi> : error during mount|bind\n");
}
- /* fall through umount */
+ if (token == TOK_BI)
+ break;
+ /* fall through umount if we were trying a move */
case TOK_UM:
/* O <old_dir> : umount <old_dir> after a pivot. */
- if (umount(cfg_args[1]) == -1) {
+ if (umount2(cfg_args[1], MNT_DETACH) == -1) {
error = 1;
print("<um> : error during umount\n");
}
@@ -1224,9 +1524,13 @@ int main(int argc, char **argv) {
print("unknown cmd in /.preinit\n");
break;
}
- } /* while (token != TOK_EOF) */
- } else if (pid1) {
- print("init/info : error while opening configuration file\n");
+ finish_cmd:
+ if (cond & TOK_COND_NEG)
+ error = !error;
+ } /* while (1) */
+ } else if (pid1 && !linuxrc) {
+ print("init/info : error while opening configuration file : ");
+ print(cfg_file); print("\n");
/* /.preinit was not found. In this case, we take default actions :
* - mount /proc
@@ -1253,22 +1557,57 @@ int main(int argc, char **argv) {
}
}
}
+ else {
+ print("init/info : error while opening configuration file : ");
+ print(cfg_file); print("\n");
+ }
if (rebuild) {
+ print("end of rebuild\n");
+#ifdef SLOW_DEBUG
+ sleep(10);
+#endif
/* nothing more to do */
return 0;
}
- /* handle the lilo command line "INIT=prog" */
- if ((cmdline_arg = find_arg("INIT")) != NULL) {
- argv[0] = cmdline_arg;
- argv[1] = NULL;
- }
+ /* We undo all that we can to restore a clean context.
+ * In case the init has been specified by the user at the console prompt,
+ * we don't close 0/1/2 nor dismount /dev, else we wouldn't be able to do
+ * anything.
+ */
+ if (cmd_input != INPUT_KBD) {
+ if (linuxrc) {
+ close(2); close(1); close(0);
+ umount2(dev_name, MNT_DETACH);
+ print("exit from linuxrc\n");
+#ifdef SLOW_DEBUG
+ sleep(10);
+#endif
+ /* handle the lilo command line "init2=prog" */
+ cmdline_arg = find_arg(CONST_STR("init2"));
+ } else {
+ /* handle the lilo command line "INIT=prog" */
+ cmdline_arg = find_arg(CONST_STR("INIT"));
+ }
+
+ if (cmdline_arg != NULL) {
+ argv[0] = cmdline_arg;
+ argv[1] = NULL;
+ }
+ }
print("init/debug: *argv = "); print (*argv); print("\n");
umask(old_umask);
- err = execve(*argv, argv, environ);
+#ifdef SLOW_DEBUG
+ sleep(10);
+#endif
+ err = execve(*argv, argv, envp);
print("init/error : last execve() failed\n");
- sleep(200);
+
+ /* we'll get a panic there, so let some time for the user to read messages */
+ if (pid1)
+ sleep(60);
+
return err;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 08:52:45 +0000