diff options
| -rw-r--r-- | include/libbb.h | 2 | ||||
| -rw-r--r-- | libbb/xreadlink.c | 75 | ||||
| -rwxr-xr-x | testsuite/realpath.tests | 45 |
3 files changed, 91 insertions, 31 deletions
diff --git a/include/libbb.h b/include/libbb.h index b72576f28..296417dae 100644 --- a/include/libbb.h +++ b/include/libbb.h @@ -578,7 +578,7 @@ DIR *xopendir(const char *path) FAST_FUNC; DIR *warn_opendir(const char *path) FAST_FUNC; char *xmalloc_realpath(const char *path) FAST_FUNC RETURNS_MALLOC; -char *xmalloc_realpath_coreutils(const char *path) FAST_FUNC RETURNS_MALLOC; +char *xmalloc_realpath_coreutils(char *path) FAST_FUNC RETURNS_MALLOC; char *xmalloc_readlink(const char *path) FAST_FUNC RETURNS_MALLOC; char *xmalloc_readlink_or_warn(const char *path) FAST_FUNC RETURNS_MALLOC; /* !RETURNS_MALLOC: it's a realloc-like function */ diff --git a/libbb/xreadlink.c b/libbb/xreadlink.c index a18dd0748..2682f6975 100644 --- a/libbb/xreadlink.c +++ b/libbb/xreadlink.c @@ -123,7 +123,7 @@ char* FAST_FUNC xmalloc_realpath(const char *path) #endif } -char* FAST_FUNC xmalloc_realpath_coreutils(const char *path) +char* FAST_FUNC xmalloc_realpath_coreutils(char *path) { char *buf; @@ -137,32 +137,19 @@ char* FAST_FUNC xmalloc_realpath_coreutils(const char *path) * (the directory must exist). */ if (!buf && errno == ENOENT) { - char *last_slash = strrchr(path, '/'); - if (last_slash) { - *last_slash++ = '\0'; - buf = xmalloc_realpath(path); - if (buf) { - unsigned len = strlen(buf); - buf = xrealloc(buf, len + strlen(last_slash) + 2); - buf[len++] = '/'; - strcpy(buf + len, last_slash); - } - } else { - char *target = xmalloc_readlink(path); - if (target) { - char *cwd; - if (target[0] == '/') { - /* - * $ ln -s /bin/qwe symlink # note: /bin is a link to /usr/bin - * $ readlink -f symlink - * /usr/bin/qwe/target_does_not_exist - * $ realpath symlink - * /usr/bin/qwe/target_does_not_exist - */ - buf = xmalloc_realpath_coreutils(target); - free(target); - return buf; - } + char *target, c, *last_slash; + size_t i; + + target = xmalloc_readlink(path); + if (target) { + /* + * $ ln -s /bin/qwe symlink # note: /bin is a link to /usr/bin + * $ readlink -f symlink + * /usr/bin/qwe + * $ realpath symlink + * /usr/bin/qwe + */ + if (target[0] != '/') { /* * $ ln -s target_does_not_exist symlink * $ readlink -f symlink @@ -170,13 +157,41 @@ char* FAST_FUNC xmalloc_realpath_coreutils(const char *path) * $ realpath symlink * /CURDIR/target_does_not_exist */ - cwd = xrealloc_getcwd_or_warn(NULL); - buf = concat_path_file(cwd, target); + char *cwd = xrealloc_getcwd_or_warn(NULL); + char *tmp = concat_path_file(cwd, target); free(cwd); free(target); - return buf; + target = tmp; + } + buf = xmalloc_realpath_coreutils(target); + free(target); + return buf; + } + + /* ignore leading and trailing slashes */ + while (path[0] == '/' && path[1] == '/') + ++path; + i = strlen(path) - 1; + while (i > 0 && path[i] == '/') + i--; + c = path[i + 1]; + path[i + 1] = '\0'; + + last_slash = strrchr(path, '/'); + if (last_slash == path) + buf = xstrdup(path); + else if (last_slash) { + *last_slash = '\0'; + buf = xmalloc_realpath(path); + *last_slash++ = '/'; + if (buf) { + unsigned len = strlen(buf); + buf = xrealloc(buf, len + strlen(last_slash) + 2); + buf[len++] = '/'; + strcpy(buf + len, last_slash); } } + path[i + 1] = c; } return buf; diff --git a/testsuite/realpath.tests b/testsuite/realpath.tests new file mode 100755 index 000000000..0e68e0279 --- /dev/null +++ b/testsuite/realpath.tests @@ -0,0 +1,45 @@ +#!/bin/sh + +# Realpath tests. +# Copyright 2006 by Natanael Copa <n@tanael.org> +# Copyright 2021 by Ron Yorston <rmy@pobox.com> +# Licensed under GPLv2, see file LICENSE in this source tree. + +. ./testing.sh + +unset LC_ALL +unset LC_MESSAGES +unset LANG +unset LANGUAGE + +TESTDIR=realpath_testdir +TESTLINK1="link1" +TESTLINK2="link2" + +# create the dir and test files +mkdir -p "./$TESTDIR" +ln -s "./$TESTDIR/not_file" "./$TESTLINK1" +ln -s "./$TESTDIR/not_file/not_dir" "./$TESTLINK2" + +# shell's $PWD may leave symlinks unresolved. +# "pwd" may be a built-in and have the same problem. +# External pwd _can't_ have that problem (current dir on Unix is physical). +pwd=`which pwd` +pwd=`$pwd` +testing "realpath on non-existent absolute path 1" "realpath /not_file" "/not_file\n" "" "" +testing "realpath on non-existent absolute path 2" "realpath /not_file/" "/not_file\n" "" "" +testing "realpath on non-existent absolute path 3" "realpath //not_file" "/not_file\n" "" "" +testing "realpath on non-existent absolute path 4" "realpath /not_dir/not_file 2>&1" "realpath: /not_dir/not_file: No such file or directory\n" "" "" + +testing "realpath on non-existent local file 1" "realpath $TESTDIR/not_file" "$pwd/$TESTDIR/not_file\n" "" "" +testing "realpath on non-existent local file 2" "realpath $TESTDIR/not_dir/not_file 2>&1" "realpath: $TESTDIR/not_dir/not_file: No such file or directory\n" "" "" + +testing "realpath on link to non-existent file 1" "realpath $TESTLINK1" "$pwd/$TESTDIR/not_file\n" "" "" +testing "realpath on link to non-existent file 2" "realpath $TESTLINK2 2>&1" "realpath: $TESTLINK2: No such file or directory\n" "" "" +testing "realpath on link to non-existent file 3" "realpath ./$TESTLINK1" "$pwd/$TESTDIR/not_file\n" "" "" +testing "realpath on link to non-existent file 4" "realpath ./$TESTLINK2 2>&1" "realpath: ./$TESTLINK2: No such file or directory\n" "" "" + +# clean up +rm -r "$TESTLINK1" "$TESTLINK2" "$TESTDIR" + +exit $((FAILCOUNT <= 255 ? FAILCOUNT : 255)) |