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/*
* delpkg.c - remove an installed package
* https://rawnix.org
*
* Copyright (c) 2025 zorz@gmx.com
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "db.h"
#include "meta.h"
#include "util.h"
#include <err.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/utsname.h>
static void error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fputs("delpkg: error: ", stderr);
vfprintf(stderr, fmt, ap);
fputc('\n', stderr);
va_end(ap);
}
static void usage(void)
{
fprintf(stderr,
"usage: delpkg [-f] [-r root] <package>\n"
" -r alternative installation root\n"
" -f override the kernel refusals\n"
);
exit(1);
}
int main(int argc, char **argv)
{
const char *opt_root = NULL, *opt_pkg = NULL;
int opt_force = 0;
const char *root;
pkgdb_t *db;
pkg_t *pkg;
pkg_meta_t *meta;
char *meta_path;
size_t i;
int c;
while ((c = getopt(argc, argv, "fr:vh")) != -1) {
switch (c) {
case 'r': opt_root = optarg; break;
case 'f': opt_force = 1; break;
case 'v':
printf("delpkg (mkpkg) %s\n", MKPKG_VERSION);
return 0;
case 'h': usage(); /* FALLTHROUGH */
default: usage();
}
}
if (optind >= argc)
errx(1, "no package specified — try -h");
if (optind < argc - 1)
errx(1, "too many arguments");
opt_pkg = argv[optind];
if (getuid() != 0)
errx(1, "must be root to remove packages");
root = opt_root ? opt_root : (getenv("PKG_ROOT") ? getenv("PKG_ROOT") : "/");
db = db_open(root, 1);
pkg = db_find(db, opt_pkg);
if (!pkg)
errx(1, "%s is not installed", opt_pkg);
/*
* Two refusals, both answered from the db. A kernel is not declared
* anywhere -- it is a package that happens to own lib/modules/<ver>/,
* so both checks are derived from the file list, not annotated in the
* MAKEPKG. -f overrides; nothing else does.
*/
if (!opt_force) {
struct utsname un;
char running_pfx[PATH_MAX_LEN];
int have_running = 0, owns_modules = 0, others_own = 0;
pkg_t *p;
/*
* uname() reports the kernel of the machine running delpkg, not
* of the tree being modified. Under -r that is the builder's
* kernel and the comparison is meaningless, so restrict the
* running-kernel refusal to the live system.
*/
if (strcmp(root, "/") == 0 && uname(&un) == 0) {
snprintf(running_pfx, sizeof(running_pfx),
"lib/modules/%s/", un.release);
have_running = 1;
}
for (i = 0; i < pkg->files->count; i++) {
const char *f = pkg->files->items[i];
if (strncmp(f, "lib/modules/", 12) != 0)
continue;
owns_modules = 1;
if (have_running &&
strncmp(f, running_pfx, strlen(running_pfx)) == 0)
errx(1, "%s owns the running kernel's modules "
"(lib/modules/%s) -- boot another kernel first, "
"or -f to override", opt_pkg, un.release);
}
if (owns_modules) {
for (p = db->head; p && !others_own; p = p->next) {
if (strcmp(p->name, opt_pkg) == 0)
continue;
for (i = 0; i < p->files->count; i++)
if (strncmp(p->files->items[i], "lib/modules/", 12) == 0) {
others_own = 1;
break;
}
}
if (!others_own)
errx(1, "%s owns the last module tree under lib/modules/ "
"-- removing it leaves no bootable kernel, "
"or -f to override", opt_pkg);
}
}
/* read package metadata before touching anything */
{
char *metadir = path_join(root, PKG_METADIR);
meta_path = path_join(metadir, opt_pkg);
free(metadir);
}
meta = meta_read(meta_path);
free(meta_path);
/* disable services before removing files */
meta_del_services(meta, root);
/* remove package files — triggers still need pkg->files alive */
remove_pkg_files(root, pkg->files, db, opt_pkg, NULL);
/* remove .new config files left from upgrades */
for (i = 0; i < pkg->files->count; i++) {
const char *f = pkg->files->items[i];
size_t len = strlen(f);
if (strncmp(f, "etc/", 4) != 0) continue;
if (len > 0 && f[len - 1] == '/') continue;
{
char *fp = path_join(root, f);
char newpath[PATH_MAX_LEN];
snprintf(newpath, sizeof(newpath), "%s.new", fp);
unlink(newpath);
free(fp);
}
}
/* service dirs are only empty now that the payload is gone */
meta_prune_service_dirs(meta, root);
run_ldconfig(root);
run_triggers(root, pkg->files, 0);
/* remove groups no longer needed — after triggers, before db update */
meta_del_groups(meta, root, opt_pkg);
meta_free(meta);
/* remove from database — db_remove frees pkg */
db_remove(db, opt_pkg);
if (db_write(db) < 0) {
error("files removed but database write failed — "
"package may still appear as installed");
db_close(db);
return 1;
}
db_close(db);
return 0;
}
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