path: root/mkpkg.c

/*
 * mkpkg.c - package build tool for rawnix.org
 * https://rawnix.org
 *
 * Copyright (c) 2025 zorz@gmx.com
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include "mkpkg.h"
#include "archive.h"
#include "db.h"

#include <limits.h>

#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>

static void error(const char *fmt, ...)
{
    va_list ap;
    va_start(ap, fmt);
    fputs("mkpkg: error: ", stderr);
    vfprintf(stderr, fmt, ap);
    fputc('\n', stderr);
    va_end(ap);
}

static config_t *g_config = NULL;

static void on_interrupt(int sig)
{
    (void)sig;
    if (g_config && !g_config->keep_work)
        remove_work_dir(g_config);
    _exit(1);
}

static void init_config(config_t *c, const char *cwd)
{
    /* preserve flags set before init */
    int keep_work        = c->keep_work;
    int resume           = c->resume;
    int clean            = c->clean;
    int clean_download   = c->clean_download;
    int clean_footprint  = c->clean_footprint;
    int clean_signature  = c->clean_signature;
    int clean_work       = c->clean_work;
    int download         = c->download;
    int download_only    = c->download_only;
    int extract_only     = c->extract_only;
    int print_footprint  = c->print_footprint;
    int print_checksums  = c->print_checksums;
    int update_footprint = c->update_footprint;
    int update_checksums = c->update_checksums;
    int update_signature = c->update_signature;
    int update_pubkey    = c->update_pubkey;
    int check_signature  = c->check_signature;
    int show_pubkey      = c->show_pubkey;
    int ignore_footprint = c->ignore_footprint;
    int ignore_checksums = c->ignore_checksums;
    int ignore_signature = c->ignore_signature;
    int lockbox          = c->lockbox;
    int no_lockbox       = c->no_lockbox;
    int install          = c->install;
    char rootfs[PATH_MAX_LEN];
    char compression[8];
    snprintf(rootfs,      sizeof(rootfs),      "%s", c->rootfs);
    snprintf(compression, sizeof(compression), "%s", c->compression);

    memset(c, 0, sizeof(config_t));

    snprintf(c->root_dir,    sizeof(c->root_dir),    "%s", cwd);
    snprintf(c->source_dir,  sizeof(c->source_dir),  "%s", cwd);
    snprintf(c->package_dir, sizeof(c->package_dir), "%s", cwd);
    snprintf(c->work_dir,    sizeof(c->work_dir),    "%s/work", cwd);
    snprintf(c->tmp_dir,     sizeof(c->tmp_dir),     "/dev/shm");

    /*
     * Recipe selection.
     *
     * A locked port keeps the operator's edited recipe in
     * MAKEPKG.lock.  `ports -u` overwrites MAKEPKG with upstream's
     * but carries --exclude=*.lock, so the lock file survives the
     * sync and is the recipe to build from whenever it exists.
     *
     * Every consumer of the recipe goes through config->pkgfile --
     * parse_pkgfile(), the sha256sums writer in checksum.c and the
     * signify() writer in signature.c -- so this one assignment
     * covers building, `mkpkg -u` and signing alike.  That is
     * deliberate: a locked port's checksums and signature belong to
     * the locked recipe, not to upstream's.
     *
     * Announced on stderr, never silent.  The failure mode this
     * trades against is editing MAKEPKG, rebuilding, and finding
     * nothing changed with no clue why.
     *
     * The lock pins the whole build description, not just the recipe:
     * .footprint.lock and .signature.lock go with MAKEPKG.lock.
     * `ports -u` overwrites .footprint and .signature with upstream's
     * (its --exclude=*.lock spares all three .lock files), so a locked
     * build checked against them failed its footprint, and on a machine
     * with a secret key the automatic post-build signing overwrote the
     * port's real .signature with one for the lock.  Every reader and
     * writer goes through footprint_file / signature_file.
     */
    {
        char lockpath[PATH_MAX_LEN];
        int  locked;

        snprintf(lockpath, sizeof(lockpath), "%s/MAKEPKG.lock", cwd);
        locked = access(lockpath, F_OK) == 0;

        snprintf(c->pkgfile, sizeof(c->pkgfile), "%s",
                 locked ? "MAKEPKG.lock" : "MAKEPKG");
        snprintf(c->footprint_file, sizeof(c->footprint_file), "%s",
                 locked ? ".footprint.lock" : ".footprint");
        snprintf(c->signature_file, sizeof(c->signature_file), "%s",
                 locked ? ".signature.lock" : ".signature");
        if (locked)
            fprintf(stderr,
                    "mkpkg: port is locked, building MAKEPKG.lock\n");
    }

    snprintf(c->config_file,    sizeof(c->config_file),    "/etc/mkpkg.conf");
    snprintf(c->nostrip_file,   sizeof(c->nostrip_file),   ".nostrip");

    /* restore flags */
    c->keep_work        = keep_work;
    c->resume           = resume;
    c->clean            = clean;
    c->clean_download   = clean_download;
    c->clean_footprint  = clean_footprint;
    c->clean_signature  = clean_signature;
    c->clean_work       = clean_work;
    c->download         = download;
    c->download_only    = download_only;
    c->extract_only     = extract_only;
    c->print_footprint  = print_footprint;
    c->print_checksums  = print_checksums;
    c->update_footprint = update_footprint;
    c->update_checksums = update_checksums;
    c->update_signature = update_signature;
    c->update_pubkey    = update_pubkey;
    c->check_signature  = check_signature;
    c->show_pubkey      = show_pubkey;
    c->ignore_footprint = ignore_footprint;
    c->ignore_checksums = ignore_checksums;
    c->ignore_signature = ignore_signature;
    c->lockbox          = lockbox;
    c->no_lockbox       = no_lockbox;
    c->install          = install;
    snprintf(c->rootfs,      sizeof(c->rootfs),      "%s", rootfs);
    snprintf(c->compression, sizeof(c->compression), "%s", compression);
}

int check_directory(const char *path, int write_required)
{
    struct stat st;

    if (stat(path, &st) != 0) {
        error("directory '%s' does not exist.", path); return E_DIR_PERM;
    }
    if (!S_ISDIR(st.st_mode)) {
        error("'%s' is not a directory.", path); return E_DIR_PERM;
    }
    if (write_required && access(path, W_OK) != 0) {
        error("directory '%s' not writable.", path); return E_DIR_PERM;
    }
    if (access(path, R_OK | X_OK) != 0) {
        error("directory '%s' not readable.", path); return E_DIR_PERM;
    }
    return 0;
}

void make_work_dir(config_t *c)
{
    char pkg_dir[PATH_MAX_LEN];
    char src_dir[PATH_MAX_LEN];

    if (c->work_dir[0] == '/' && !str_ends_with(c->work_dir, "/work")) {
        char actual[PATH_MAX_LEN];
        snprintf(actual, sizeof(actual), "%s/mkpkg_%d", c->work_dir, getpid());
        info("using tmpfs build directory: %s", actual);
        snprintf(c->work_dir, sizeof(c->work_dir), "%s", actual);
    }

    snprintf(pkg_dir, sizeof(pkg_dir), "%s/pkg", c->work_dir);
    snprintf(src_dir, sizeof(src_dir), "%s/src", c->work_dir);

    remove_work_dir(c);

    if (mkdirp(c->work_dir, 0755) < 0)
        { error("cannot create work directory: %s", c->work_dir); exit(E_DIR_PERM); }
    if (mkdir(pkg_dir, 0755) != 0)
        { error("cannot create pkg directory"); exit(E_DIR_PERM); }
    if (mkdir(src_dir, 0755) != 0)
        { error("cannot create src directory"); exit(E_DIR_PERM); }
}

int remove_work_dir(config_t *c)
{
    if (c->work_dir[0]) return rmrf(c->work_dir);
    return 0;
}

int build_needed(pkgfile_t *pkgfile, config_t *config, const char *target)
{
    struct stat pkg_st, src_st;
    int         i;

    if (access(target, F_OK) != 0) return 1;
    if (stat(target, &pkg_st) != 0) return 1;

    for (i = 0; i < pkgfile->source_count; i++) {
        char        local[PATH_MAX_LEN];
        const char *url = pkgfile->sources[i].url;

        if (pkgfile->sources[i].rename &&
            strcmp(pkgfile->sources[i].rename, "SKIP") == 0) continue;

        if (strchr(url, '/')) {
            const char *base = strrchr(url, '/');
            snprintf(local, sizeof(local), "%s/%s",
                     config->source_dir, base ? base + 1 : url);
        } else {
            snprintf(local, sizeof(local), "%s/%s", config->root_dir, url);
        }

        if (stat(local, &src_st) == 0 && src_st.st_mtime > pkg_st.st_mtime)
            return 1;
    }
    return 0;
}

/*
 * Is the full lockbox wanted for this build?  -b or lockbox=(yes) turn
 * it on; -ib turns it off and wins over both.
 */
static int use_lockbox(const pkgfile_t *pkgfile, const config_t *config)
{
    if (config->no_lockbox) return 0;
    return config->lockbox || pkgfile->has_lockbox;
}

static void run_post_shell(pkgfile_t *pkgfile, config_t *config)
{
    if (pkgfile->has_post_shell)
        run_shell_hook(pkgfile, config, "post",
                       pkgfile->post_shell_cmds, pkgfile->post_shell_count);
}

/*
 * shell() [pre], then the build itself, full lockbox or not.
 *
 * A failing shell() [pre] stops here: it sets up what build() relies
 * on (wrappers, links), and building without it only fails later with
 * a less useful error -- or, worse, succeeds with the wrong tools.
 */
static int run_build(pkgfile_t *pkgfile, config_t *config, const char *target)
{
    int ret;

    if (pkgfile->has_pre_shell) {
        ret = run_shell_hook(pkgfile, config, "pre",
                             pkgfile->pre_shell_cmds,
                             pkgfile->pre_shell_count);
        if (ret != 0) {
            /* undo whatever part of the setup did happen */
            run_post_shell(pkgfile, config);
            return ret;         /* run_shell_hook() said why */
        }
    }

    if (config->resume)
        info("resuming build");
    else
        make_work_dir(config);

    if (use_lockbox(pkgfile, config))
        ret = lockbox_enter(pkgfile, config, target);
    else
        ret = build_package(pkgfile, config, target);

    if (!config->keep_work)
        remove_work_dir(config);

    /*
     * shell() [post] is the cleanup for shell() [pre]; a failed build
     * must not leave the pre hook's wrappers behind.  On success the
     * caller runs it later, after the footprint check and signing.
     */
    if (ret != 0)
        run_post_shell(pkgfile, config);
    return ret;
}

/*
 * Make sure the sources are there and correct: when a build is needed
 * (or -d asks for it) fetch what is missing -- an error without -d --
 * then verify sha256sums unless -ic.
 */
static int prepare_sources(pkgfile_t *pkgfile, config_t *config,
                           const char *target)
{
    int ret, i;

    if (config->download || build_needed(pkgfile, config, target)) {
        if (!config->download) {
            int missing = 0;
            for (i = 0; i < pkgfile->source_count; i++) {
                source_t   *src = &pkgfile->sources[i];
                const char *url = src->url;
                char        dest[PATH_MAX_LEN];
                const char *base;

                if (src->rename && strcmp(src->rename, "SKIP") == 0)
                    continue;
                if (!strchr(url, '/'))
                    continue;   /* local file, not a URL */

                if (src->rename && src->rename[0])
                    snprintf(dest, sizeof(dest), "%s/%s",
                             config->source_dir, src->rename);
                else {
                    base = strrchr(url, '/');
                    snprintf(dest, sizeof(dest), "%s/%s",
                             config->source_dir, base ? base + 1 : url);
                }

                if (access(dest, F_OK) != 0)
                    missing++;
            }
            if (missing) {
                error("%s %s sources not found (use -d to download)",
                      pkgfile->name, pkgfile->version);
                return E_DOWNLOAD;
            }
        }
        ret = download_sources(pkgfile, config);
        if (ret != 0) return ret;
    }

    if (!config->ignore_checksums) {
        ret = verify_checksums(pkgfile, config);
        if (ret != 0) return ret;
    }
    return 0;
}

/*
 * Is another version of `name` installed in `root`?  Then -r installs
 * with addpkg -u.  The same version is left to addpkg to refuse.
 */
static int other_version_installed(const char *root, const char *name,
                                   const char *verrel)
{
    pkgdb_t *db = db_open(root && root[0] ? root : "/", 0);
    pkg_t   *p  = db_find(db, name);
    int      r  = p && strcmp(p->version, verrel) != 0;

    db_close(db);
    return r;
}

static void print_help(void)
{
    printf(
        "usage: mkpkg [dir] [options]\n"
        "  -d          download sources\n"
        "  -e          extract sources\n"
        "  -c          print checksums to stdout\n"
        "  -p          show embedded public key\n"
        "  -f          print footprint to stdout\n"
        "  -s          verify signature\n"
        "  -w / -ww    keep work dir / resume build\n"
        "  -b          force lockbox\n"
        "  -x [dfsw]   remove\n"
        "  -u [cfsp]   update\n"
        "  -i [cfsnb]  ignore\n"
        "  -o [de]     only\n"
        "  -r <path>   install to rootfs after build\n"
        "  -g <file>   alternate config file\n"
        "  -v / -h     version / help\n"
    );
}

static void parse_flags(const char *arg, config_t *c, int *flag_w)
{
    const char *p;
    char        grp = 0;

    for (p = arg; *p; p++) {
        switch (*p) {
        case 'x': grp = 'x'; c->clean = 1; break;
        case 'u': grp = 'u'; break;
        case 'i': grp = 'i'; break;
        case 'o': grp = 'o'; break;
        default:
            if (grp == 'x') {
                if (*p == 'd') c->clean_download  = 1;
                if (*p == 'f') c->clean_footprint = 1;
                if (*p == 's') c->clean_signature = 1;
                if (*p == 'w') c->clean_work      = 1;
            } else if (grp == 'u') {
                if (*p == 'c') c->update_checksums = 1;
                if (*p == 'f') c->update_footprint  = 1;
                if (*p == 's') c->update_signature  = 1;
                if (*p == 'p') c->update_pubkey     = 1;
            } else if (grp == 'i') {
                if (*p == 'c') c->ignore_checksums  = 1;
                if (*p == 'f') c->ignore_footprint  = 1;
                if (*p == 's') c->ignore_signature  = 1;
                if (*p == 'b') c->no_lockbox        = 1;
            } else if (grp == 'o') {
                if (*p == 'd') c->download_only = 1;
                if (*p == 'e') c->extract_only  = 1;
            } else {
                switch (*p) {
                case 'd': c->download        = 1; break;
                case 'e': c->extract_only    = 1; break;
                case 'c': c->print_checksums = 1; break;
                case 'f': c->print_footprint = 1; break;
                case 's': c->check_signature = 1; break;
                case 'p': c->show_pubkey     = 1; break;
                case 'b': c->lockbox         = 1; break;
                case 'w': (*flag_w)++;             break;
                case 'v': printf("mkpkg %s\n", MKPKG_VERSION); exit(0);
                case 'h': print_help(); exit(0);
                default:  errx(1, "unknown option: -%c", *p);
                }
            }
        }
    }
}

int main(int argc, char **argv)
{
    config_t  config;
    pkgfile_t pkgfile;
    char      cwd[PATH_MAX_LEN];
    char      target[PATH_MAX_LEN];
    char      sig_file[PATH_MAX_LEN];
    char      footprint_path[PATH_MAX_LEN];
    char      pkg_name[256], pkg_verrel[512];
    char     *opt_rootfs = NULL;
    char     *opt_config = NULL;
    char     *opt_dir    = NULL;
    int       flag_w     = 0;
    int       ret        = 0;
    int       built      = 0;
    int       i;

    memset(&config, 0, sizeof(config));

    for (i = 1; i < argc; i++) {
        char *a = argv[i];

        if (a[0] != '-') {
            if (!opt_dir) { opt_dir = a; continue; }
            errx(1, "unexpected argument: %s", a);
        }
        if (strcmp(a, "--help")    == 0) { print_help(); return 0; }
        if (strcmp(a, "--version") == 0) {
            printf("mkpkg %s\n", MKPKG_VERSION); return 0;
        }
        if (strcmp(a, "-r") == 0) {
            if (++i >= argc) errx(1, "-r requires an argument");
            opt_rootfs = argv[i]; continue;
        }
        if (strcmp(a, "-g") == 0) {
            if (++i >= argc) errx(1, "-g requires an argument");
            opt_config = argv[i]; continue;
        }
        parse_flags(a + 1, &config, &flag_w);
    }

    config.keep_work = flag_w > 0;
    config.resume    = flag_w > 1;

    if (opt_rootfs) {
        snprintf(config.rootfs, sizeof(config.rootfs), "%s", opt_rootfs);
        config.install = 1;
    }

    /* resolve -g before chdir(dir): it names a file relative to where
     * mkpkg was started, and the hooks need an absolute path */
    if (opt_config) {
        static char conf_abs[PATH_MAX];
        if (!realpath(opt_config, conf_abs))
            err(1, "%s", opt_config);
        opt_config = conf_abs;
    }

    if (opt_dir && chdir(opt_dir) != 0)
        err(1, "cannot chdir to '%s'", opt_dir);

    if (getcwd(cwd, sizeof(cwd)) == NULL)
        err(1, "getcwd");

    init_config(&config, cwd);

    if (opt_config)
        snprintf(config.config_file, sizeof(config.config_file),
                 "%s", opt_config);

    parse_config(config.config_file, &config);

    /* MKPKG_COMPRESSION_MODE default — gzip if not configured */
    if (!config.compression[0])
        snprintf(config.compression, sizeof(config.compression), "gz");

    g_config = &config;
    signal(SIGINT,  on_interrupt);
    signal(SIGTERM, on_interrupt);
    signal(SIGPIPE, SIG_IGN);   /* ignore broken pipes from child pipelines */

    if (access(config.pkgfile, F_OK) != 0)
        errx(1, "file '%s' not found.", config.pkgfile);

    /* resolve target */
    {
        pkgfile_t tmp;
        if (parse_pkgfile(config.pkgfile, &tmp) != 0) return E_PKGFILE;
        snprintf(target, sizeof(target), "%s/%s#%s-%s.pkg.tar.%s",
                 config.package_dir, tmp.name, tmp.version, tmp.release,
                 config.compression);
        snprintf(pkg_name,   sizeof(pkg_name),   "%s", tmp.name);
        snprintf(pkg_verrel, sizeof(pkg_verrel), "%s-%s",
                 tmp.version, tmp.release);
        free_pkgfile(&tmp);
    }

    snprintf(sig_file, sizeof(sig_file), "%s/%s",
             config.root_dir, config.signature_file);
    snprintf(footprint_path, sizeof(footprint_path), "%s/%s",
             config.root_dir, config.footprint_file);

    /* -x [dfs]: remove */
    if (config.clean) {
        if (access(target, F_OK) == 0) {
            info("removing %s", target); unlink(target);
        }
        if (config.clean_download) {
            pkgfile_t tmp;
            if (parse_pkgfile(config.pkgfile, &tmp) == 0) {
                for (i = 0; i < tmp.source_count; i++) {
                    const char *url  = tmp.sources[i].url;
                    const char *base = strrchr(url, '/');
                    if (base) {
                        char local[PATH_MAX_LEN];
                        snprintf(local, sizeof(local), "%s/%s",
                                 config.source_dir, base + 1);
                        if (access(local, F_OK) == 0) {
                            info("removing %s", local); unlink(local);
                        }
                    }
                }
                free_pkgfile(&tmp);
            }
        }
        if (config.clean_footprint && access(footprint_path, F_OK) == 0) {
            info("removing %s", footprint_path); unlink(footprint_path);
        }
        if (config.clean_signature && access(sig_file, F_OK) == 0) {
            info("removing %s", sig_file); unlink(sig_file);
        }
        if (config.clean_work) {
            char workdir[PATH_MAX_LEN];
            snprintf(workdir, sizeof(workdir), "%s/work", config.root_dir);
            if (access(workdir, F_OK) == 0) {
                info("removing %s", workdir);
                rmrf(workdir);
            }
        }
        return 0;
    }

    /* -f: print footprint to stdout */
    if (config.print_footprint) {
        if (access(target, F_OK) != 0)
            errx(1, "package not found: %s", target);
        return arc_footprint(target);
    }

    /* -c: print checksums to stdout */
    if (config.print_checksums) {
        pkgfile_t pf;
        if (parse_pkgfile(config.pkgfile, &pf) != 0) return E_PKGFILE;
        ret = generate_checksums(&pf, &config);
        free_pkgfile(&pf);
        return ret;
    }

    /* -p: show embedded public key */
    if (config.show_pubkey) {
        pkgfile_t pf;
        if (parse_pkgfile(config.pkgfile, &pf) != 0) return E_PKGFILE;
        ret = show_pubkey(&pf);
        free_pkgfile(&pf);
        return ret;
    }

    /* -s: verify signature */
    if (config.check_signature) {
        pkgfile_t pf;
        if (parse_pkgfile(config.pkgfile, &pf) != 0) return E_PKGFILE;
        if (!pf.has_signify) {
            error("no signify() function found in %s", config.pkgfile);
            free_pkgfile(&pf); return E_SIGNATURE;
        }
        if (access(sig_file, F_OK) != 0) {
            error("signature not found: %s", sig_file);
            free_pkgfile(&pf); return E_SIGNATURE;
        }
        ret = verify_signature(sig_file, &pf, &config);
        if (ret == 0) info("signature check passed");
        free_pkgfile(&pf);
        return ret;
    }

    /* -od: download only */
    if (config.download_only) {
        pkgfile_t pf;
        if (parse_pkgfile(config.pkgfile, &pf) != 0) return E_PKGFILE;
        ret = download_sources(&pf, &config);
        free_pkgfile(&pf);
        return ret;
    }

    /* -oe / -e: extract only */
    if (config.extract_only) {
        pkgfile_t pf;
        char      src_dir[PATH_MAX_LEN];
        if (parse_pkgfile(config.pkgfile, &pf) != 0) return E_PKGFILE;
        snprintf(src_dir, sizeof(src_dir), "%s/src", config.work_dir);
        make_work_dir(&config);
        ret = unpack_sources(&pf, &config, src_dir);
        free_pkgfile(&pf);
        return ret;
    }

    /*
     * -u[cfsp]: the letters combine, and run in the order a maintainer
     * would: p (key into the recipe), c (checksums into the recipe),
     * then with s the build if needed, f (accept the footprint), and
     * the signature last, so it covers what p, c and f wrote.
     */
    if (config.update_pubkey) {
        pkgfile_t pf;
        if (parse_pkgfile(config.pkgfile, &pf) != 0) return E_PKGFILE;
        ret = update_pubkey(&pf, &config);
        free_pkgfile(&pf);
        if (ret != 0) return ret;
    }

    if (config.update_checksums) {
        pkgfile_t pf;
        if (parse_pkgfile(config.pkgfile, &pf) != 0) return E_PKGFILE;
        ret = update_checksums(&pf, &config);
        free_pkgfile(&pf);
        if (ret != 0) return ret;
    }

    if (config.update_footprint && !config.update_signature) {
        if (access(target, F_OK) != 0)
            errx(1, "package not found: %s", target);
        return update_footprint(target, footprint_path, &config);
    }

    if ((config.update_pubkey || config.update_checksums) &&
        !config.update_signature)
        return 0;

    /* parse MAKEPKG fully for build / sign */
    memset(&pkgfile, 0, sizeof(pkgfile));
    if (parse_pkgfile(config.pkgfile, &pkgfile) != 0) return E_PKGFILE;

    /* -us: update signature */
    if (config.update_signature) {
        /* the signature vouches for the sources: check them first,
         * whether or not the package has to be rebuilt */
        ret = prepare_sources(&pkgfile, &config, target);
        if (ret != 0) { free_pkgfile(&pkgfile); return ret; }

        if (build_needed(&pkgfile, &config, target)) {
            ret = run_build(&pkgfile, &config, target);
            if (ret != 0) { free_pkgfile(&pkgfile); return ret; }
            built = 1;
        } else {
            info("%s is up to date.", target);
        }

        if (config.update_footprint)
            ret = update_footprint(target, footprint_path, &config);

        if (ret == 0) {
            int fp_ret = check_footprint(target, footprint_path, &config);
            if (fp_ret != 0 && !config.ignore_footprint) {
                error("footprint mismatch");
                error("not signed");
                ret = E_FOOTPRINT;
            } else {
                int sr = create_signature(&pkgfile, &config);
                if (sr == -2) {
                    error("no secret key");
                    error("not signed");
                    ret = E_SIGNATURE;
                } else if (sr != 0) {
                    error("signature failed");
                    ret = E_SIGNATURE;
                }
            }
        }
        if (built)
            run_post_shell(&pkgfile, &config);
        free_pkgfile(&pkgfile);
        return ret;
    }

    /* verify signature before build */
    if (!config.ignore_signature) {
        if (!pkgfile.has_signify) {
            error("no signify() function found in %s", config.pkgfile);
            free_pkgfile(&pkgfile); return E_SIGNATURE;
        }
        if (access(sig_file, F_OK) != 0) {
            error("signature not found: %s", sig_file);
            if (strcmp(config.pkgfile, "MAKEPKG.lock") == 0)
                fprintf(stderr, "mkpkg: locked port: sign the lock with "
                        "`mkpkg -us`, or build with -is\n");
            free_pkgfile(&pkgfile); return E_SIGNATURE;
        }
        if (verify_signature(sig_file, &pkgfile, &config) != 0) {
            error("port signature verification failed");
            free_pkgfile(&pkgfile); return E_SIGNATURE;
        }
    }

    /* download, verify checksums */
    ret = prepare_sources(&pkgfile, &config, target);
    if (ret != 0) { free_pkgfile(&pkgfile); return ret; }

    /* up to date? */
    if (!build_needed(&pkgfile, &config, target)) {
        info("%s is up to date.", target);
        free_pkgfile(&pkgfile); return 0;
    }

    /* shell() [pre], build (full lockbox: Landlock restricts the build
     * in a child; per-cmd lockbox: lbexec wraps commands in build()) */
    ret = run_build(&pkgfile, &config, target);
    if (ret != 0) { free_pkgfile(&pkgfile); return ret; }

    /*
     * Footprint check -- signing only if the footprint is clean.  A
     * mismatch does not fail the build: the package of a long build
     * (firefox, llvm) is kept, and the maintainer reviews the list,
     * then accepts it with -uf and signs with -us.
     */
    {
        int fp_ret = check_footprint(target, footprint_path, &config);
        if (!config.ignore_signature && pkgfile.has_signify) {
            if (fp_ret == 0 || config.ignore_footprint) {
                int sr = create_signature(&pkgfile, &config);
                if (sr != 0 && sr != -2)
                    warning("failed to create signature");
                /* sr == -2: no key configured, skip silently */
            }
        }
    }

    /* post-shell hook */
    run_post_shell(&pkgfile, &config);

    /* install to rootfs -- an upgrade if another version is there */
    if (config.install) {
        config.upgrade = other_version_installed(config.rootfs,
                                                 pkg_name, pkg_verrel);
        ret = install_package(target, config.upgrade, config.rootfs);
    }

    free_pkgfile(&pkgfile);
    return ret;
}