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preinit: parse rootfstype from kernel command line

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This commit is contained in:
Daniel Barlow 2023-10-19 18:56:09 +01:00
parent f3225c2bd5
commit 61dc5beca8
5 changed files with 116 additions and 13 deletions
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22
pkgs/preinit/preinit.c
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@ -10,6 +10,8 @@
#endif
#include <asm/setup.h>
void parseopts(char * cmdline, char **root, char **rootfstype);
#define ERR(x) write(2, x, strlen(x))
#define AVER(c) do { if(c < 0) ERR("failed: " #c); } while(0)
@ -40,6 +42,7 @@ char buf[COMMAND_LINE_SIZE];
int main(int argc, char *argv[], char *envp[])
{
char *rootdevice = 0;
char *rootfstype = 0;
char *p = buf;
write(1, banner, strlen(banner));
@ -54,22 +57,17 @@ int main(int argc, char *argv[], char *envp[])
write(1, buf, len);
};
while(*p) {
if(begins_with(p, "root=")) {
rootdevice = p + 5;
while(*p && (*p != ' ')) p++;
*p= '\0';
}
while(*p && (*p != ' ')) p++;
p++;
}
parseopts(buf, &rootdevice, &rootfstype);
if(rootdevice) {
if(!rootfstype) rootfstype = "jffs2"; /* backward compatibility */
write(1, "rootdevice ", 11);
write(1, rootdevice, strlen(rootdevice));
write(1, "\n", 1);
write(1, " (", 2);
write(1, rootfstype, strlen(rootfstype));
write(1, ")\n", 1);
AVER(mount(rootdevice, "/target/persist", "ubifs", 0, NULL));
AVER(mount(rootdevice, "/target/persist", rootfstype, 0, NULL));
AVER(mount("/target/persist/nix", "/target/nix",
"bind", MS_BIND, NULL));