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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 <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <tpax/tpax.h>
#include "tpax_driver_impl.h"
#include "tpax_errinfo_impl.h"
#include "tpax_readlink_impl.h"
static int tpax_free_unit_ctx_impl(struct tpax_unit_ctx_impl * ctx, int ret)
{
if (ctx) {
free(ctx);
}
return ret;
}
int tpax_lib_get_unit_ctx(
const struct tpax_driver_ctx * dctx,
int fdat,
const char * path,
struct tpax_unit_ctx ** pctx)
{
int ret;
struct tpax_unit_ctx_impl * ctx;
if (!dctx)
return TPAX_CUSTOM_ERROR(
dctx,TPAX_ERR_NULL_CONTEXT);
else if (!(ctx = calloc(1,sizeof(*ctx))))
return TPAX_BUFFER_ERROR(dctx);
tpax_driver_set_ectx(
dctx,0,path);
if (dctx->cctx->drvflags & TPAX_DRIVER_EXEC_MODE_WRITE_COPY) {
ret = fstatat(
fdat,path,&ctx->st,
AT_SYMLINK_NOFOLLOW);
if (ret < 0) {
free(ctx);
return TPAX_SYSTEM_ERROR(dctx);
}
}
if (S_ISLNK(ctx->st.st_mode)) {
if (tpax_readlinkat(
fdat,path,ctx->linkbuf,
sizeof(ctx->linkbuf)) < 0) {
free(ctx);
return TPAX_SYSTEM_ERROR(dctx);
}
}
ctx->path = path;
ctx->link = ctx->linkbuf[0] ? ctx->linkbuf : 0;
ctx->uctx.path = &ctx->path;
ctx->uctx.link = &ctx->link;
ctx->uctx.st = &ctx->st;
*pctx = &ctx->uctx;
return 0;
}
void tpax_lib_free_unit_ctx(struct tpax_unit_ctx * ctx)
{
struct tpax_unit_ctx_impl * ictx;
uintptr_t addr;
if (ctx) {
addr = (uintptr_t)ctx - offsetof(struct tpax_unit_ctx_impl,uctx);
ictx = (struct tpax_unit_ctx_impl *)addr;
tpax_free_unit_ctx_impl(ictx,0);
}
}
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