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/******************************************************/
/* tpax: a topological pax implementation */
/* Copyright (C) 2020 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
/******************************************************/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <sys/stat.h>
#include <tpax/tpax.h>
#include <tpax/tpax_specs.h>
#include "tpax_driver_impl.h"
#include "tpax_tmpfile_impl.h"
#include "tpax_errinfo_impl.h"
#ifndef ssizeof
#define ssizeof(x) (ssize_t)(sizeof(x))
#endif
static int tpax_archive_append_memory_data(
int fdout,
void * buf,
ssize_t nbytes)
{
ssize_t ret;
char * ch;
for (ch=buf; nbytes; ch+=ret) {
ret = write(fdout,ch,nbytes);
while ((ret < 0) && (errno == EINTR))
ret = write(fdout,ch,nbytes);
if (ret < 0)
return ret;
nbytes -= ret;
}
return 0;
}
static int tpax_archive_append_pad(
const struct tpax_driver_ctx * dctx,
int fdout,
const struct stat * st)
{
int ret;
off_t cpos;
ssize_t nbytes;
char buf[512];
nbytes = st->st_size;
nbytes += 0x1ff;
nbytes |= 0x1ff;
nbytes ^= 0x1ff;
nbytes -= st->st_size;
memset(buf,0,nbytes);
cpos = tpax_get_driver_cpos(dctx);
cpos += st->st_size + nbytes;
if (!(ret = tpax_archive_append_memory_data(fdout,buf,nbytes)))
tpax_set_driver_cpos(dctx,cpos);
return ret;
}
int tpax_archive_append(
const struct tpax_driver_ctx * dctx,
const struct tpax_unit_ctx * uctx)
{
struct tpax_ustar_header uhdr;
off_t hpos;
off_t dpos;
int fdout;
int fdtmp;
ssize_t nread;
ssize_t nbytes;
void * buf;
size_t buflen;
size_t cmplen;
void * membuf;
char sbuf[2048];
/* record errors */
tpax_driver_set_ectx(
dctx,0,
*uctx->path);
/* driver */
fdout = tpax_driver_fdout(dctx);
/* header and data offsets: todo pax and cpio */
hpos = tpax_get_driver_cpos(dctx);
dpos = hpos + sizeof(uhdr);
/* header */
if (tpax_init_ustar_header(
dctx,*uctx->path,uctx->st,
*uctx->link,&uhdr) < 0)
return TPAX_NESTED_ERROR(dctx);
/* buffer */
membuf = 0;
fdtmp = -1;
/* associated data? */
if S_ISREG(uctx->st->st_mode) {
if ((buf = tpax_get_driver_anon_map_addr(dctx,&buflen)))
if (buflen >= (cmplen = uctx->st->st_size))
membuf = buf;
if (ssizeof(sbuf) >= (uctx->st->st_size))
membuf = sbuf;
/* snapshot */
if (membuf) {
if (tpax_file_create_memory_snapshot(
dctx,*uctx->path,
uctx->st,membuf) < 0)
return TPAX_NESTED_ERROR(dctx);
} else {
if ((fdtmp = tpax_file_create_tmpfs_snapshot(
dctx,*uctx->path,
uctx->st)) < 0)
return TPAX_NESTED_ERROR(dctx);
if (lseek(fdtmp,0,SEEK_SET) < 0)
return TPAX_SYSTEM_ERROR(dctx);
}
}
/* append header */
if (tpax_archive_append_memory_data(fdout,&uhdr,ssizeof(uhdr)) < 0) {
if (fdtmp >= 0)
close(fdtmp);
return TPAX_SYSTEM_ERROR(dctx);
}
tpax_set_driver_cpos(dctx,dpos);
/* all done? */
if (!(S_ISREG(uctx->st->st_mode)))
return 0;
/* append data from snapshot */
if (fdtmp >= 0) {
if (!buf) {
buf = sbuf;
buflen = sizeof(sbuf);
}
for (nread=0; nread<uctx->st->st_size; ) {
nbytes = read(fdtmp,buf,buflen);
while ((nbytes < 0) && (errno == EINTR))
nbytes = read(fdtmp,buf,buflen);
if (nbytes < 0) {
close(fdtmp);
return TPAX_SYSTEM_ERROR(dctx);
} else if (nbytes == 0) {
close(fdtmp);
return TPAX_CUSTOM_ERROR(dctx,TPAX_ERR_FLOW_ERROR);
} else {
nread += nbytes;
}
if (tpax_archive_append_memory_data(fdout,buf,nbytes) < 0) {
close(fdtmp);
return TPAX_SYSTEM_ERROR(dctx);
}
}
close(fdtmp);
} else {
if (tpax_archive_append_memory_data(
fdout,membuf,
uctx->st->st_size) < 0)
return TPAX_SYSTEM_ERROR(dctx);
}
return tpax_archive_append_pad(
dctx,fdout,uctx->st);
}
int tpax_archive_seal(const struct tpax_driver_ctx * dctx)
{
int fdout;
off_t cpos;
ssize_t nbytes;
ssize_t nwritten;
ssize_t blksize;
char buf[512];
blksize = tpax_get_archive_block_size(dctx);
cpos = tpax_get_driver_cpos(dctx);
if (cpos % 512)
return TPAX_CUSTOM_ERROR(dctx,TPAX_ERR_FLOW_ERROR);
fdout = tpax_driver_fdout(dctx);
memset(buf,0,sizeof(buf));
switch (cpos % blksize) {
case 0:
nbytes = cpos + blksize;
break;
default:
nbytes = cpos / blksize;
nbytes *= blksize;
nbytes += blksize;
if (nbytes-cpos == 512)
nbytes += blksize;
}
for (nwritten=cpos; nwritten<nbytes; nwritten+=512) {
if (tpax_archive_append_memory_data(fdout,buf,512) < 0)
return TPAX_SYSTEM_ERROR(dctx);
tpax_set_driver_cpos(dctx,nwritten);
}
return 0;
}
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