070aa6174
Denys Vlasenko
2019-06-13
Subject
readlink,realpath: fix a case with a symplink, closes 11021
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libbb/xreadlink.c+29 -0
| @@ -147,6 +147,35 @@ char* FAST_FUNC xmalloc_realpath_coreutils(const char *path) | |
| buf[len++] = '/'; | |
| strcpy(buf + len, last_slash); | |
| } | |
| + | } else { |
| + | char *link = xmalloc_readlink(path); |
| + | if (link) { |
| + | char *cwd; |
| + | if (link[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(link); |
| + | free(link); |
| + | return buf; |
| + | } |
| + | /* |
| + | * $ ln -s target_does_not_exist symlink |
| + | * $ readlink -f symlink |
| + | * /CURDIR/target_does_not_exist |
| + | * $ realpath symlink |
| + | * /CURDIR/target_does_not_exist |
| + | */ |
| + | cwd = xrealloc_getcwd_or_warn(NULL); |
| + | buf = concat_path_file(cwd, link); |
| + | free(cwd); |
| + | free(link); |
| + | return buf; |
| + | } |
| } | |
| } | |