Add ability to generate newc additions on runtime.
This commit is contained in:
Vladimir 'phcoder' Serbinenko
parent
0ec45a682c
commit
92750e4c60
10 changed files with 366 additions and 201 deletions
294
grub-core/loader/linux.c
Normal file
294
grub-core/loader/linux.c
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@ -0,0 +1,294 @@
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/linux.h>
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#include <grub/misc.h>
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#include <grub/file.h>
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#include <grub/mm.h>
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struct newc_head
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{
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char magic[6];
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char ino[8];
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char mode[8];
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char uid[8];
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char gid[8];
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char nlink[8];
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char mtime[8];
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char filesize[8];
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char devmajor[8];
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char devminor[8];
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char rdevmajor[8];
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char rdevminor[8];
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char namesize[8];
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char check[8];
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} __attribute__ ((packed));
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struct grub_linux_initrd_component
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{
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grub_file_t file;
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char *newc_name;
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grub_off_t size;
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};
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struct dir
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{
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char *name;
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struct dir *next;
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struct dir *child;
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};
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static char
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hex (grub_uint8_t val)
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{
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if (val < 10)
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return '0' + val;
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return 'a' + val - 10;
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}
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static void
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set_field (char *var, grub_uint32_t val)
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{
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int i;
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char *ptr = var;
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for (i = 28; i >= 0; i -= 4)
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*ptr++ = hex((val >> i) & 0xf);
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}
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static grub_uint8_t *
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make_header (grub_uint8_t *ptr,
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const char *name, grub_size_t len,
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grub_uint32_t mode,
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grub_off_t fsize)
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{
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struct newc_head *head = (struct newc_head *) ptr;
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grub_uint8_t *optr;
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grub_size_t oh = 0;
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grub_memcpy (head->magic, "070701", 6);
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set_field (head->ino, 0);
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set_field (head->mode, mode);
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set_field (head->uid, 0);
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set_field (head->gid, 0);
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set_field (head->nlink, 1);
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set_field (head->mtime, 0);
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set_field (head->filesize, fsize);
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set_field (head->devmajor, 0);
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set_field (head->devminor, 0);
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set_field (head->rdevmajor, 0);
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set_field (head->rdevminor, 0);
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set_field (head->namesize, len);
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set_field (head->check, 0);
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optr = ptr;
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ptr += sizeof (struct newc_head);
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grub_memcpy (ptr, name, len);
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ptr += len;
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oh = ALIGN_UP_OVERHEAD (ptr - optr, 4);
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grub_memset (ptr, 0, oh);
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ptr += oh;
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return ptr;
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}
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static void
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free_dir (struct dir *root)
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{
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if (!root)
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return;
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free_dir (root->next);
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free_dir (root->child);
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grub_free (root->name);
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grub_free (root);
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}
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static grub_size_t
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insert_dir (const char *name, struct dir **root,
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grub_uint8_t *ptr)
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{
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struct dir *cur, **head = root;
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const char *cb, *ce = name;
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grub_size_t size = 0;
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while (1)
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{
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for (cb = ce; *cb == '/'; cb++);
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for (ce = cb; *ce && *ce != '/'; ce++);
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if (!*ce)
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break;
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for (cur = *root; cur; cur = cur->next)
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if (grub_memcmp (cur->name, cb, ce - cb)
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&& cur->name[ce - cb] == 0)
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break;
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if (!cur)
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{
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struct dir *n;
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n = grub_zalloc (sizeof (*n));
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if (!n)
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return 0;
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n->next = *head;
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n->name = grub_strndup (cb, ce - cb);
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if (ptr)
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{
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grub_printf ("Creating directory %s, %s\n", name, ce);
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ptr = make_header (ptr, name, ce - name,
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040777, 0);
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}
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size += ALIGN_UP ((ce - (char *) name)
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+ sizeof (struct newc_head), 4);
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*head = n;
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cur = n;
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}
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root = &cur->next;
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}
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return size;
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}
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grub_err_t
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grub_initrd_init (int argc, char *argv[],
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struct grub_linux_initrd_context *initrd_ctx)
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{
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int i;
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int newc = 0;
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struct dir *root = 0;
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initrd_ctx->nfiles = 0;
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initrd_ctx->components = 0;
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initrd_ctx->components = grub_zalloc (argc
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* sizeof (initrd_ctx->components[0]));
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if (!initrd_ctx->components)
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return grub_errno;
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initrd_ctx->size = 0;
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for (i = 0; i < argc; i++)
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{
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const char *fname = argv[i];
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if (grub_memcmp (argv[i], "newc:", 5) == 0)
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{
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const char *ptr, *eptr;
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ptr = argv[i] + 5;
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while (*ptr == '/')
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ptr++;
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eptr = grub_strchr (ptr, ':');
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if (eptr)
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{
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grub_file_filter_disable_compression ();
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initrd_ctx->components[i].newc_name = grub_strndup (ptr, eptr - ptr);
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if (!initrd_ctx->components[i].newc_name)
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{
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grub_initrd_close (initrd_ctx);
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return grub_errno;
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}
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initrd_ctx->size
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+= ALIGN_UP (sizeof (struct newc_head)
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+ grub_strlen (initrd_ctx->components[i].newc_name),
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4);
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initrd_ctx->size += insert_dir (initrd_ctx->components[i].newc_name,
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&root, 0);
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newc = 1;
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fname = eptr + 1;
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}
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}
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else if (newc)
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{
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initrd_ctx->size += ALIGN_UP (sizeof (struct newc_head)
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+ sizeof ("TRAILER!!!") - 1, 4);
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free_dir (root);
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root = 0;
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newc = 0;
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}
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grub_file_filter_disable_compression ();
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initrd_ctx->components[i].file = grub_file_open (fname);
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if (!initrd_ctx->components[i].file)
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{
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grub_initrd_close (initrd_ctx);
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return grub_errno;
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}
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initrd_ctx->nfiles++;
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initrd_ctx->components[i].size
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= grub_file_size (initrd_ctx->components[i].file);
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initrd_ctx->size += ALIGN_UP (initrd_ctx->components[i].size, 4);
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}
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if (newc)
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{
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initrd_ctx->size += ALIGN_UP (sizeof (struct newc_head)
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+ sizeof ("TRAILER!!!") - 1, 4);
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free_dir (root);
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root = 0;
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}
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return GRUB_ERR_NONE;
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}
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grub_size_t
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grub_get_initrd_size (struct grub_linux_initrd_context *initrd_ctx)
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{
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return initrd_ctx->size;
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}
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void
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grub_initrd_close (struct grub_linux_initrd_context *initrd_ctx)
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{
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int i;
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if (!initrd_ctx->components)
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return;
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for (i = 0; i < initrd_ctx->nfiles; i++)
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{
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grub_free (initrd_ctx->components[i].newc_name);
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grub_file_close (initrd_ctx->components[i].file);
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}
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grub_free (initrd_ctx->components);
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initrd_ctx->components = 0;
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}
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grub_err_t
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grub_initrd_load (struct grub_linux_initrd_context *initrd_ctx,
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char *argv[], void *target)
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{
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grub_uint8_t *ptr = target;
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int i;
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int newc = 0;
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struct dir *root = 0;
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for (i = 0; i < initrd_ctx->nfiles; i++)
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{
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grub_ssize_t cursize;
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if (initrd_ctx->components[i].newc_name)
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{
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ptr += insert_dir (initrd_ctx->components[i].newc_name,
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&root, ptr);
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ptr = make_header (ptr, initrd_ctx->components[i].newc_name,
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grub_strlen (initrd_ctx->components[i].newc_name),
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0100777,
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initrd_ctx->components[i].size);
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newc = 1;
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}
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else if (newc)
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{
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ptr = make_header (ptr, "TRAILER!!!", sizeof ("TRAILER!!!") - 1,
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0, 0);
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free_dir (root);
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root = 0;
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newc = 0;
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}
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cursize = initrd_ctx->components[i].size;
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if (grub_file_read (initrd_ctx->components[i].file, ptr, cursize)
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!= cursize)
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{
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if (!grub_errno)
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grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
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argv[i]);
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grub_initrd_close (initrd_ctx);
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return grub_errno;
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}
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ptr += cursize;
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grub_memset (ptr, 0, ALIGN_UP_OVERHEAD (cursize, 4));
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ptr += ALIGN_UP_OVERHEAD (cursize, 4);
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}
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if (newc)
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ptr = make_header (ptr, "TRAILER!!!", sizeof ("TRAILER!!!") - 1, 0, 0);
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free_dir (root);
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root = 0;
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return GRUB_ERR_NONE;
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}
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