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scripts: mkhash fail on hashing a folder

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mkhash currently returns the hash of an empty input when trying to hash
a folder. This can be missleading in caseswhere e.g. an env variable is
undefined which should contain a filename. `mkhash ./path/to/$FILE`
would exit with code 0 and return a legit looking checksum.

A better behaviour would be to fail with exit code 1, which imitates the
behaviour of `md5sum` and `sha256sum`.

To avoid hashing of folders the `stat()` is checked.

Hashing empty inputs result in the following checksums:
md5: d41d8cd98f00b204e9800998ecf8427e
sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

Signed-off-by: Paul Spooren <mail@aparcar.org>
This commit is contained in:
Paul Spooren 2020-07-16 22:19:32 -10:00 committed by Daniel Golle
parent fac98f1c54
commit fcd3e13779
1 changed files with 8 additions and 0 deletions
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8
scripts/mkhash.c
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@ -85,6 +85,7 @@
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/stat.h>
#define ARRAY_SIZE(_n) (sizeof(_n) / sizeof((_n)[0]))
@ -770,6 +771,13 @@ static int hash_file(struct hash_type *t, const char *filename, bool add_filenam
if (!filename || !strcmp(filename, "-")) {
str = t->func(stdin);
} else {
struct stat path_stat;
stat(filename, &path_stat);
if (S_ISDIR(path_stat.st_mode)) {
fprintf(stderr, "Failed to open '%s': Is a directory\n", filename);
return 1;
}
FILE *f = fopen(filename, "r");
if (!f) {