From 44cf9c6d2d274eac37502e835155f7e985f1b8e6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 7 Aug 2024 15:30:08 +0200
Subject: Adding upstream version 1.22.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/realpath/main.c | 247 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 247 insertions(+)
 create mode 100644 src/realpath/main.c

(limited to 'src/realpath/main.c')

diff --git a/src/realpath/main.c b/src/realpath/main.c
new file mode 100644
index 0000000..bfa2aa2
--- /dev/null
+++ b/src/realpath/main.c
@@ -0,0 +1,247 @@
+/*
+ * dpkg-realpath - print the resolved pathname with DPKG_ROOT support
+ *
+ * Copyright © 2020 Helmut Grohne <helmut@subdivi.de>
+ * Copyright © 2020-2024 Guillem Jover <guillem@debian.org>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <compat.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#ifdef HAVE_LOCALE_H
+#include <locale.h>
+#endif
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <dpkg/i18n.h>
+#include <dpkg/dpkg.h>
+#include <dpkg/dpkg-db.h>
+#include <dpkg/debug.h>
+#include <dpkg/string.h>
+#include <dpkg/db-fsys.h>
+#include <dpkg/options.h>
+
+static const char printforhelp[] = N_(
+"Use --help for help about this utility.");
+
+static void DPKG_ATTR_NORET
+printversion(const struct cmdinfo *cip, const char *value)
+{
+	printf(_("Debian %s version %s.\n"), dpkg_get_progname(),
+	       PACKAGE_RELEASE);
+
+	printf(_(
+"This is free software; see the GNU General Public License version 2 or\n"
+"later for copying conditions. There is NO warranty.\n"));
+
+	m_output(stdout, _("<standard output>"));
+
+	exit(0);
+}
+
+static void DPKG_ATTR_NORET
+usage(const struct cmdinfo *cip, const char *value)
+{
+	printf(_(
+"Usage: %s [<option>...] <pathname>\n"
+"\n"), dpkg_get_progname());
+
+	printf(_(
+"Options:\n"
+"  -z, --zero                   end output line with NUL, not newline.\n"
+"      --instdir <directory>    set the root directory.\n"
+"      --root <directory>       set the root directory.\n"
+"      --version                show the version.\n"
+"      --help                   show this help message.\n"
+"\n"));
+
+	m_output(stdout, _("<standard output>"));
+
+	exit(0);
+}
+
+static int opt_eol = '\n';
+
+static char *
+realpath_relative_to(const char *pathname, const char *rootdir)
+{
+	struct varbuf root = VARBUF_INIT;
+	struct varbuf src = VARBUF_INIT;
+	struct varbuf dst = VARBUF_INIT;
+	struct varbuf slink = VARBUF_INIT;
+	struct varbuf result = VARBUF_INIT;
+	struct varbuf prefix = VARBUF_INIT;
+	int loop = 0;
+
+	varbuf_init(&root, 32);
+	varbuf_init(&src, 32);
+	varbuf_init(&dst, 32);
+	varbuf_init(&result, 32);
+
+	varbuf_set_str(&root, rootdir);
+	varbuf_set_str(&src, pathname);
+	varbuf_set_str(&result, rootdir);
+
+	/* Check whether the path is relative, make it absolute otherwise. */
+	if (src.buf[0] != '/') {
+		struct varbuf abs_src = VARBUF_INIT;
+
+		file_getcwd(&abs_src);
+		varbuf_add_char(&abs_src, '/');
+		varbuf_add_varbuf(&abs_src, &src);
+
+		varbuf_set_varbuf(&src, &abs_src);
+		varbuf_destroy(&abs_src);
+
+		varbuf_trim_varbuf_prefix(&src, &root);
+	}
+
+	/* Remove prefixed slashes. */
+	varbuf_trim_char_prefix(&src, '/');
+
+	while (src.used) {
+		struct stat st;
+		const char *slash;
+
+		/* Get the first directory component. */
+		varbuf_set_varbuf(&prefix, &src);
+		slash = strchrnul(prefix.buf, '/');
+		varbuf_trunc(&prefix, slash - prefix.buf);
+
+		/* Remove the first directory component from src. */
+		varbuf_trim_varbuf_prefix(&src, &prefix);
+
+		/* Remove prefixed slashes. */
+		varbuf_trim_char_prefix(&src, '/');
+
+		varbuf_set_varbuf(&slink, &result);
+		varbuf_add_char(&slink, '/');
+		varbuf_add_varbuf(&slink, &prefix);
+
+		/* Resolve the first directory component. */
+		if (strcmp(prefix.buf, ".") == 0) {
+			/* Ignore, stay at the same directory. */
+		} else if (strcmp(prefix.buf, "..") == 0) {
+			/* Go up one directory. */
+			slash = strrchr(result.buf, '/');
+			if (slash != NULL)
+				varbuf_trunc(&result, slash - result.buf);
+
+			if (root.used && !varbuf_has_prefix(&result, &root))
+				varbuf_set_varbuf(&result, &root);
+		} else if (lstat(slink.buf, &st) == 0 && S_ISLNK(st.st_mode)) {
+			ssize_t linksize;
+
+			loop++;
+			if (loop > 25)
+				ohshit(_("too many levels of symbolic links"));
+
+			/* Resolve the symlink within result. */
+			linksize = file_readlink(slink.buf, &dst, st.st_size);
+			if (linksize < 0)
+				ohshite(_("cannot read link '%s'"), slink.buf);
+			else if ((off_t)linksize != st.st_size)
+				ohshit(_("symbolic link '%s' size has changed from %jd to %zd"),
+				       slink.buf, (intmax_t)st.st_size, linksize);
+
+			if (dst.buf[0] == '/') {
+				/* Absolute pathname, reset result back to
+				 * root. */
+				varbuf_set_varbuf(&result, &root);
+
+				if (src.used) {
+					varbuf_add_char(&dst, '/');
+					varbuf_add_varbuf(&dst, &src);
+				}
+				varbuf_set_varbuf(&src, &dst);
+
+				/* Remove prefixed slashes. */
+				varbuf_trim_char_prefix(&src, '/');
+			} else {
+				/* Relative pathname. */
+				if (src.used) {
+					varbuf_add_char(&dst, '/');
+					varbuf_add_varbuf(&dst, &src);
+				}
+				varbuf_set_varbuf(&src, &dst);
+			}
+		} else {
+			/* Otherwise append the prefix. */
+			varbuf_add_char(&result, '/');
+			varbuf_add_varbuf(&result, &prefix);
+		}
+	}
+
+	/* We are done, return the resolved pathname, w/o root. */
+	varbuf_trim_varbuf_prefix(&result, &root);
+
+	varbuf_destroy(&root);
+	varbuf_destroy(&src);
+	varbuf_destroy(&dst);
+	varbuf_destroy(&slink);
+	varbuf_destroy(&prefix);
+
+	return varbuf_detach(&result);
+}
+
+static const struct cmdinfo cmdinfos[] = {
+	{ "zero",       'z', 0,  &opt_eol,     NULL,      NULL,         '\0' },
+	{ "instdir",    0,   1,  NULL,         NULL,      set_instdir,  0 },
+	{ "root",       0,   1,  NULL,         NULL,      set_instdir,  0 },
+	{ "version",    0,   0,  NULL,         NULL,      printversion  },
+	{ "help",       '?', 0,  NULL,         NULL,      usage         },
+	{  NULL,        0                                               }
+};
+
+int
+main(int argc, const char *const *argv)
+{
+	const char *instdir;
+	const char *pathname;
+	char *real_pathname;
+
+	dpkg_locales_init(PACKAGE);
+	dpkg_program_init("dpkg-realpath");
+	dpkg_options_parse(&argv, cmdinfos, printforhelp);
+
+	debug(dbg_general, "root=%s admindir=%s", dpkg_fsys_get_dir(), dpkg_db_get_dir());
+
+	pathname = argv[0];
+	if (str_is_unset(pathname))
+		badusage(_("need a pathname argument"));
+
+	instdir = dpkg_fsys_get_dir();
+	if (strlen(instdir) && strncmp(pathname, instdir, strlen(instdir)) == 0)
+		badusage(_("link '%s' includes root prefix '%s'"),
+		         pathname, instdir);
+
+	real_pathname = realpath_relative_to(pathname, instdir);
+	printf("%s%c", real_pathname, opt_eol);
+	free(real_pathname);
+
+	dpkg_program_done();
+	dpkg_locales_done();
+
+	return 0;
+}
-- 
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