nbos

nbos

https://git.tonybtw.com/nbos.git git://git.tonybtw.com/nbos.git
nbos / src / build.c
3,843 bytes raw
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#define _GNU_SOURCE
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#include "build.h"
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "fetch.h"
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#include "run.h"
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#include "sandbox.h"
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#include "store.h"
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#define WORK_ROOT "/var/lib/nb/work"
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/**
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 * build_pkg() - Realize one package into the store.
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 * @a: Arena for path scratch space.
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 * @p: Package to build.
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 * @all_pkgs: Full package list for the system (currently unused).
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 * @resolved_pkgs: Topologically-sorted resolved entries.
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 * @pkg_idx: Index of @p within @resolved_pkgs.
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 *
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 * Idempotent: returns success immediately if the store path already
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 * exists. Otherwise fetches the source tarball, extracts it, sets up
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 * a sandbox containing the resolved deps, runs the build, and atomically
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 * moves the output into the store.
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 *
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 * Return: REALIZE_OK_VAL on success, a tagged error otherwise.
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 */
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realize_error build_pkg(
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    arena              *a,
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    const pkg          *p,
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    const pkg_refs     *all_pkgs,
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    const resolved     *resolved_pkgs,
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    size_t              pkg_idx)
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{
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    (void)all_pkgs;
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    const char *store_path = resolved_pkgs[pkg_idx].store_path;
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    if (store_path_exists(store_path)) {
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        return REALIZE_OK_VAL;
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    }
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    const char *base = strrchr(store_path, '/');
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    base = (base != nullptr) ? base + 1 : store_path;
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    char *work_dir     = arena_sprintf(a, "%s/%s", WORK_ROOT, base);
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    char *src_tarball  = arena_sprintf(a, "%s/source", work_dir);
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    char *src_dir      = arena_sprintf(a, "%s/build", work_dir);
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    char *sandbox_root = arena_sprintf(a, "%s/sandbox", work_dir);
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    char *log_path     = arena_sprintf(a, "%s/build.log", work_dir);
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    char *out_dir      = arena_sprintf(a, "%s/out", work_dir);
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    if (work_dir == nullptr || src_tarball == nullptr || src_dir == nullptr || sandbox_root == nullptr || log_path == nullptr || out_dir == nullptr) {
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        return (realize_error){
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            .kind = REALIZE_E_STORE,
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            .pkg_name = p->name,
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            .errno_val = ENOMEM,
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        };
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    }
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    if (mkdir(WORK_ROOT, 0755) < 0 && errno != EEXIST) {
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        return (realize_error){ .kind = REALIZE_E_STORE, .pkg_name = p->name,
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                                .errno_val = errno };
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    }
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    if (mkdir(work_dir, 0755) < 0 && errno != EEXIST) {
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        return (realize_error){ .kind = REALIZE_E_STORE, .pkg_name = p->name,
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                                .errno_val = errno };
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    }
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    fetch_error ferr = fetch(p, src_tarball);
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    if (ferr.kind != FETCH_OK) {
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        return (realize_error){
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            .kind = REALIZE_E_FETCH,
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            .pkg_name = p->name,
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            .fetch = ferr,
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        };
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    }
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    if (mkdir(src_dir, 0755) < 0 && errno != EEXIST) {
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        return (realize_error){ .kind = REALIZE_E_STORE, .pkg_name = p->name,
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                                .errno_val = errno };
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    }
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    char *const tar_argv[] = {
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        "/usr/bin/tar", "-xf", src_tarball, "-C", src_dir, "--strip-components=1",
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        nullptr,
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    };
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    char *const tar_envp[] = { nullptr };
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    run_error tar_err = run("/usr/bin/tar", tar_argv, tar_envp, nullptr, log_path);
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    if (tar_err.kind != RUN_OK) {
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        return (realize_error){
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            .kind = REALIZE_E_BUILD,
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            .pkg_name = p->name,
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            .run = tar_err,
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        };
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    }
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    int src = sandbox_setup(sandbox_root, &p->deps, resolved_pkgs, src_dir);
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    if (src != 0) {
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        return (realize_error){
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            .kind = REALIZE_E_SANDBOX,
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            .pkg_name = p->name,
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            .errno_val = src,
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        };
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    }
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    sandbox_teardown(sandbox_root);
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    int rc = store_install(out_dir, store_path);
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    if (rc != 0) {
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        return (realize_error){
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            .kind = REALIZE_E_STORE,
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            .pkg_name = p->name,
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            .errno_val = rc,
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        };
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    }
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    return REALIZE_OK_VAL;
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}