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/*******************************************************************/
/* slibtool: a skinny libtool implementation, written in C */
/* Copyright (C) 2016--2024 SysDeer Technologies, LLC */
/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/
#include <time.h>
#include <fcntl.h>
#include <stdio.h>
#include <stddef.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/stat.h>
#include <slibtool/slibtool.h>
#include <slibtool/slibtool_arbits.h>
#include "slibtool_ar_impl.h"
#include "slibtool_driver_impl.h"
#include "slibtool_errinfo_impl.h"
/****************************************************/
/* As elsewhere in slibtool, file-system operations */
/* utilizie the _at variants of the relevant posix */
/* interfaces. In the case of archives, that means */
/* passing dctx->fdctx->fdcwd as the _fdat_ param, */
/* where dctx is the driver context which was used */
/* with slbt_get_archive_ctx(). */
/************************************************** */
#define PPRIX64 "%"PRIx64
int slbt_store_archive(
struct slbt_archive_ctx * arctx,
const char * path,
mode_t mode)
{
const struct slbt_driver_ctx * dctx;
struct stat st;
int fdat;
int fdtmp;
void * addr;
char * mark;
char * slash;
size_t buflen;
size_t nbytes;
ssize_t written;
char buf[PATH_MAX];
/* init dctx */
if (!(dctx = slbt_get_archive_ictx(arctx)->dctx))
return -1;
/* validation */
if (strlen(path) >= PATH_MAX)
return SLBT_CUSTOM_ERROR(
dctx,
SLBT_ERR_FLOW_ERROR);
/**************************************************/
/* create temporary file in the target directory */
/* */
/* the tmpfile name pattern involes the inode */
/* of the target directory, a local stack address */
/* in the calling thread, the current time, and */
/* finally the pid of the current process. */
/**************************************************/
memset(buf,0,sizeof(buf));
strcpy(buf,path);
fdat = slbt_driver_fdcwd(dctx);
addr = buf;
mark = (slash = strrchr(buf,'/'))
? slash : buf;
if (slash) {
*++mark = '\0';
if (fstatat(fdat,buf,&st,0) < 0)
return SLBT_SYSTEM_ERROR(
dctx,0);
} else {
if (fstatat(fdat,".",&st,0) < 0)
return SLBT_SYSTEM_ERROR(
dctx,0);
}
buflen = sizeof(buf) - (mark - buf);
nbytes = snprintf(
mark,
buflen,
".slibtool.tmpfile"
".inode."PPRIX64
".time."PPRIX64
".salt.%p"
".pid.%d"
".tmp",
st.st_ino,
time(0),addr,
getpid());
if (nbytes >= buflen)
return SLBT_CUSTOM_ERROR(
dctx,
SLBT_ERR_FLOW_ERROR);
if ((fdtmp = openat(fdat,buf,O_WRONLY|O_CREAT|O_EXCL,mode)) < 0)
return SLBT_SYSTEM_ERROR(dctx,0);
/* set archive size */
if (ftruncate(fdtmp,arctx->map->map_size) < 0)
return SLBT_SYSTEM_ERROR(dctx,0);
/* write archive */
mark = arctx->map->map_addr;
nbytes = arctx->map->map_size;
for (; nbytes; ) {
written = write(fdtmp,mark,nbytes);
while ((written < 0) && (errno == EINTR))
written = write(fdtmp,mark,nbytes);
if (written < 0) {
unlinkat(fdat,buf,0);
return SLBT_SYSTEM_ERROR(dctx,0);
};
nbytes -= written;
mark += written;
}
/* finalize (atomically) */
if (renameat(fdat,buf,fdat,path) < 0) {
unlinkat(fdat,buf,0);
return SLBT_SYSTEM_ERROR(dctx,0);
}
/* yay */
return 0;
}
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