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/**************************************************************/
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/* tpax: a topological pax implementation */
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/* Copyright (C) 2020--2024 SysDeer Technologies, LLC */
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/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
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/**************************************************************/
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#include <stdint.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <tpax/tpax.h>
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#include "tpax_driver_impl.h"
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#include "tpax_errinfo_impl.h"
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#include "tpax_readlink_impl.h"
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static int tpax_free_unit_ctx_impl(struct tpax_unit_ctx_impl * ctx, int ret)
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{
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if (ctx) {
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free(ctx);
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}
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return ret;
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}
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int tpax_get_unit_ctx(
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const struct tpax_driver_ctx * dctx,
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int fdat,
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const char * path,
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struct tpax_unit_ctx ** pctx)
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{
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int ret;
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struct tpax_unit_ctx_impl * ctx;
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if (!dctx)
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return TPAX_CUSTOM_ERROR(
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dctx,TPAX_ERR_NULL_CONTEXT);
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else if (!(ctx = calloc(1,sizeof(*ctx))))
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return TPAX_BUFFER_ERROR(dctx);
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tpax_driver_set_ectx(
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dctx,0,path);
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if (dctx->cctx->drvflags & TPAX_DRIVER_EXEC_MODE_WRITE_COPY) {
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ret = fstatat(
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fdat,path,&ctx->st,
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AT_SYMLINK_NOFOLLOW);
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if (ret < 0) {
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free(ctx);
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return TPAX_SYSTEM_ERROR(dctx);
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}
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}
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if (S_ISLNK(ctx->st.st_mode)) {
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if (tpax_readlinkat(
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fdat,path,ctx->linkbuf,
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sizeof(ctx->linkbuf)) < 0) {
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free(ctx);
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return TPAX_SYSTEM_ERROR(dctx);
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}
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}
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ctx->path = path;
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ctx->link = ctx->linkbuf;
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ctx->uctx.path = &ctx->path;
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ctx->uctx.link = &ctx->link;
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ctx->uctx.st = &ctx->st;
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*pctx = &ctx->uctx;
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return 0;
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}
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void tpax_free_unit_ctx(struct tpax_unit_ctx * ctx)
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{
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struct tpax_unit_ctx_impl * ictx;
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uintptr_t addr;
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if (ctx) {
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addr = (uintptr_t)ctx - offsetof(struct tpax_unit_ctx_impl,uctx);
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ictx = (struct tpax_unit_ctx_impl *)addr;
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tpax_free_unit_ctx_impl(ictx,0);
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}
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}
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