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Support command execution in kexec linux arg 

! means execute the argument as a command
This commit is contained in:
fosslinux 2023-12-05 15:50:10 +11:00
parent cef781a9f6
commit 08bd0ef495
1 changed files with 25 additions and 20 deletions
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45
sysa/kexec-linux-1.0.0/files/kexec-linux.c
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@ -10,7 +10,6 @@
int append_file(FILE *dst_file, char *src_file_name);
int main(int argc, char **argv) {
char *ramdrive_file_name, *kernel_file_name, *initramfs_file_name;
FILE *ramdrive_file;
@ -29,32 +28,31 @@ int main(int argc, char **argv) {
ramdrive_file = fopen(ramdrive_file_name, "wb");
/* Write length of kernel */
if (stat(kernel_file_name, &stats) == 0) {
size = (uint32_t) stats.st_size;
fwrite(&size, sizeof(size), 1, ramdrive_file);
} else {
fprintf(stderr, "Cannot stat kernel file '%s'\n", kernel_file_name);
exit(1);
}
/* Write length of initramfs */
if (stat(initramfs_file_name, &stats) == 0) {
size = (uint32_t) stats.st_size;
fwrite(&size, sizeof(size), 1, ramdrive_file);
} else {
fprintf(stderr, "Cannot stat initramfs file '%s'\n", initramfs_file_name);
exit(1);
}
/* Move past where lengths go */
int length_offset = 2 * sizeof(uint32_t);
fseek(ramdrive_file, length_offset, SEEK_SET);
uint32_t last_pos = ftell(ramdrive_file);
if (append_file(ramdrive_file, kernel_file_name)) {
fprintf(stderr, "Cannot append kernel '%s'\n", kernel_file_name);
exit(1);
}
uint32_t kernel_size = ftell(ramdrive_file) - last_pos;
last_pos = ftell(ramdrive_file);
if (append_file(ramdrive_file, initramfs_file_name)) {
fprintf(stderr, "Cannot append initramfs '%s'\n", initramfs_file_name);
exit(1);
}
uint32_t initramfs_size = ftell(ramdrive_file) - last_pos;
/* Now write the lengths */
fseek(ramdrive_file, 0, SEEK_SET);
fwrite(&kernel_size, sizeof(kernel_size), 1, ramdrive_file);
fwrite(&initramfs_size, sizeof(initramfs_size), 1, ramdrive_file);
fclose(ramdrive_file);
/* Flush ram drive writes to device */
@ -68,10 +66,17 @@ int append_file(FILE *dst_file, char *src_file_name) {
FILE *src_file;
char buff[BUFSIZ];
size_t n;
if (*src_file_name == '!') {
src_file_name++;
src_file = popen(src_file_name, "r");
} else {
src_file = fopen(src_file_name, "rb");
}
if (src_file = fopen(src_file_name, "rb")) {
if (src_file) {
while ((n = fread(buff, 1, BUFSIZ, src_file)) != 0) {
fwrite(buff, 1, n, dst_file );
fwrite(buff, 1, n, dst_file);
}
fclose(src_file);
return 0;