diff options
| -rw-r--r-- | debianutils/Config.in | 7 | ||||
| -rw-r--r-- | debianutils/readlink.c | 24 | ||||
| -rw-r--r-- | include/usage.h | 12 |
3 files changed, 39 insertions, 4 deletions
diff --git a/debianutils/Config.in b/debianutils/Config.in index 7cf7cad..f13d56e 100644 --- a/debianutils/Config.in +++ b/debianutils/Config.in @@ -24,6 +24,13 @@ config CONFIG_READLINK This program reads a symbolic link and returns the name of the file it points to +config CONFIG_FEATURE_READLINK_FOLLOW + bool " Enable canonicalization by following all symlinks (-f)" + default n + depends on CONFIG_READLINK + help + Enable the readlink option (-f). + config CONFIG_RUN_PARTS bool "run-parts" default n diff --git a/debianutils/readlink.c b/debianutils/readlink.c index d8d7e8c..90927bb 100644 --- a/debianutils/readlink.c +++ b/debianutils/readlink.c @@ -23,18 +23,38 @@ #include <errno.h> #include <unistd.h> #include <stdlib.h> +#include <getopt.h> #include "busybox.h" +#ifdef CONFIG_FEATURE_READLINK_FOLLOW +# define READLINK_FOLLOW "f" +# define READLINK_FLAG_f (1 << 0) +#else +# define READLINK_FOLLOW "" +#endif + +static const char readlink_options[] = READLINK_FOLLOW; + int readlink_main(int argc, char **argv) { char *buf = NULL; + unsigned long opt = bb_getopt_ulflags(argc, argv, readlink_options); +#ifdef CONFIG_FEATURE_READLINK_FOLLOW + RESERVE_CONFIG_BUFFER(resolved_path, PATH_MAX); +#endif /* no options, no getopt */ - if (argc != 2) + if (optind + 1 != argc) bb_show_usage(); - buf = xreadlink(argv[1]); +#ifdef CONFIG_FEATURE_READLINK_FOLLOW + if (opt & READLINK_FLAG_f) { + buf = realpath(argv[optind], resolved_path); + } else +#endif + buf = xreadlink(argv[optind]); + if (!buf) return EXIT_FAILURE; puts(buf); diff --git a/include/usage.h b/include/usage.h index 377eb10..d928a10 100644 --- a/include/usage.h +++ b/include/usage.h @@ -1985,10 +1985,18 @@ "\t-s\tSet the system date and time (default).\n" \ "\t-p\tPrint the date and time." +#ifdef CONFIG_FEATURE_READLINK_FOLLOW +#define USAGE_READLINK_FOLLOW(a) a +#else +#define USAGE_READLINK_FOLLOW(a) +#endif + #define readlink_trivial_usage \ - "" + USAGE_READLINK_FOLLOW("[-f] ") "FILE" #define readlink_full_usage \ - "Displays the value of a symbolic link." + "Displays the value of a symbolic link." \ + USAGE_READLINK_FOLLOW("\n\nOptions:\n" \ + "\t-f\tcanonicalize by following all symlinks") #define realpath_trivial_usage \ "pathname ..." |