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/**************************************************************/
/* tpax: a topological pax implementation */
/* Copyright (C) 2020--2024 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
/**************************************************************/
#include <stdint.h>
#include <stdlib.h>
#include <tpax/tpax.h>
#include "tpax_driver_impl.h"
#include "tpax_errinfo_impl.h"
#include "tpax_visibility_impl.h"
#define TPAX_MAX_DEPTH 512
tpax_hidden const char * tpax_queue_item_full_path(
const struct tpax_driver_ctx * dctx,
const struct tpax_dirent * cdent)
{
char * ch;
char * pathbuf;
const struct tpax_dirent * pparent;
const struct tpax_dirent ** pdirent;
const struct tpax_dirent * dirstck[TPAX_MAX_DEPTH];
if (cdent->depth >= TPAX_MAX_DEPTH)
return 0;
ch = pathbuf = (tpax_get_driver_ictx(dctx))->dirbuff;
for (pparent=cdent,pdirent=dirstck; pparent; pparent=pparent->parent)
*pdirent++ = pparent;
*pdirent-- = 0;
if (pdirent[0]->prefix)
ch += sprintf(ch,"%s",pdirent[0]->prefix);
for (; pdirent > dirstck; ) {
if (!(pdirent[0]->flags & TPAX_ITEM_SYMLINK))
ch += sprintf(ch,"%s/",pdirent[0]->dirent.d_name);
pdirent--;
}
if (pdirent[0]->flags & TPAX_ITEM_SYMLINK) {
*--ch = '\0';
} else {
sprintf(ch,"%s",pdirent[0]->dirent.d_name);
}
return pathbuf;
}
static int tpax_cpio_dirent_compare(const void * a, const void * b)
{
const struct tpax_dirent * direnta;
const struct tpax_dirent * direntb;
direnta = *(const struct tpax_dirent **)a;
direntb = *(const struct tpax_dirent **)b;
return (direnta->stdev == direntb->stdev)
? direnta->stino - direntb->stino
: direnta->stdev - direntb->stdev;
}
static int tpax_update_cpio_queue_vector(const struct tpax_driver_ctx * dctx)
{
struct tpax_driver_ctx_impl * ictx;
struct tpax_dirent ** cpiov;
struct tpax_dirent ** direntv;
struct tpax_dirent * cdent;
dev_t stdev;
ino_t stino;
int cpdev;
int cpino;
int nlink;
int idx;
/* driver */
ictx = tpax_get_driver_ictx(dctx);
/* not needed? */
if (ictx->nqueued == 0)
return 0;
/* vector copy */
direntv = ictx->direntv;
cpiov = ictx->cpiov;
for (; *direntv; )
*cpiov++ = *direntv++;
/* sort by real st_dev, st_ino */
qsort(ictx->cpiov,ictx->nqueued,sizeof(*cpiov),tpax_cpio_dirent_compare);
/* set the cpio internal c_dev, c_ino, and c_nlink fields (U+1F620) */
cpiov = ictx->cpiov;
cdent = cpiov[0];
cpiov++;
cpdev = 1;
cpino = 1;
nlink = 1;
stdev = cdent->stdev;
stino = cdent->stino;
cdent->cpdev = cpdev;
cdent->cpino = cpino;
cdent->nlink = nlink;
for (; *cpiov; ) {
cdent = *cpiov;
if (cdent->srdev > 0777777)
return TPAX_CUSTOM_ERROR(
dctx,
TPAX_ERR_FLOW_ERROR);
if ((cdent->stdev == stdev) && (cdent->stino == stino)) {
nlink++;
} else if (cdent->stdev > stdev) {
if (nlink > 1)
for (idx=2; idx<=nlink; idx++)
cpiov[-idx]->nlink = nlink;
cpdev++;
cpino = 1;
nlink = 1;
stdev = cdent->stdev;
stino = cdent->stino;
if (cpdev > 0777777)
return TPAX_CUSTOM_ERROR(
dctx,
TPAX_ERR_FLOW_ERROR);
} else if (cdent->stino > stino) {
if (nlink > 1)
for (idx=2; idx<=nlink; idx++)
cpiov[-idx]->nlink = nlink;
cpino++;
stino = cdent->stino;
nlink = 1;
if (cpino > 0777777)
return TPAX_CUSTOM_ERROR(
dctx,
TPAX_ERR_FLOW_ERROR);
}
cdent->cpdev = cpdev;
cdent->cpino = cpino;
cdent->nlink = nlink;
cpiov++;
}
if (nlink > 1)
for (idx=2; idx<=nlink; idx++)
cpiov[-idx]->nlink = nlink;
return 0;
}
tpax_hidden int tpax_update_queue_vector(const struct tpax_driver_ctx * dctx)
{
uintptr_t addr;
struct tpax_driver_ctx_impl * ictx;
struct tpax_dirent_buffer * dentbuf;
struct tpax_dirent ** direntv;
struct tpax_dirent * cdent;
struct tpax_dirent * cnext;
size_t arrsize;
/* driver */
ictx = tpax_get_driver_ictx(dctx);
/* vector alloc */
if (ictx->direntv) {
free(ictx->direntv);
free(ictx->cpiov);
ictx->direntv = 0;
ictx->cpiov = 0;
}
arrsize = ictx->nqueued + 1;
if (!(ictx->direntv = calloc(arrsize,sizeof(struct tpax_dirent *))))
return TPAX_SYSTEM_ERROR(dctx);
if (dctx->cctx->drvflags & TPAX_DRIVER_WRITE_FORMAT_CPIO)
if (!(ictx->cpiov = calloc(arrsize,sizeof(struct tpax_dirent *))))
return TPAX_SYSTEM_ERROR(dctx);
/* queue vector */
dentbuf = tpax_get_driver_dirents(dctx);
cdent = ictx->nqueued ? dentbuf->dbuf : 0;
for (direntv=ictx->direntv; cdent; direntv++) {
*direntv = cdent;
addr = (uintptr_t)cdent;
addr += cdent->nsize;
cnext = (struct tpax_dirent *)addr;
if (cnext == dentbuf->cdent) {
dentbuf = dentbuf->next;
cnext = dentbuf ? dentbuf->dbuf : 0;
}
cdent = cnext;
}
if (dctx->cctx->drvflags & TPAX_DRIVER_WRITE_FORMAT_CPIO)
if (tpax_update_cpio_queue_vector(dctx) < 0)
return TPAX_NESTED_ERROR(dctx);
return 0;
}
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