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authorLudovic Courtès <ludo@gnu.org>2014-02-21 17:54:32 +0100
committerLudovic Courtès <ludo@gnu.org>2014-02-21 23:49:52 +0100
commit3140f2df423d1235c3766e3478a429ac89d882ed (patch)
treea250657c8c3682f5be9f40493d328f9c9ab83f20
parentc1d52c71aa4fc8085a9737ad1b235ca53a854649 (diff)
downloadgnu-guix-3140f2df423d1235c3766e3478a429ac89d882ed.tar
gnu-guix-3140f2df423d1235c3766e3478a429ac89d882ed.tar.gz
guix hash: Add '--recursive'.
* guix/scripts/hash.scm (show-help): Add --recursive. (%options): Likewise. (guix-hash)[file-hash]: New procedure. Honor --recursive. Use it. * guix/nar.scm (write-file): Add missing field to the &nar-error condition raised upon unsupported file type; change its message to be more descriptive. * tests/guix-hash.sh: Add tests with -r. * doc/guix.texi (Invoking guix hash): Document --recursive.
-rw-r--r--doc/guix.texi13
-rw-r--r--guix/nar.scm4
-rw-r--r--guix/scripts/hash.scm25
-rw-r--r--tests/guix-hash.sh22
4 files changed, 57 insertions, 7 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 34f6810f34..ce011959ad 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -1958,6 +1958,19 @@ If the @option{--format} option is not specified, @command{guix hash}
will output the hash in @code{nix-base32}. This representation is used
in the definitions of packages.
+@item --recursive
+@itemx -r
+Compute the hash on @var{file} recursively.
+
+In this case, the hash is computed on an archive containing @var{file},
+including its children if it is a directory. Some of @var{file}'s
+meta-data is part of the archive; for instance, when @var{file} is a
+regular file, the hash is different depending on whether @var{file} is
+executable or not. Meta-data such as time stamps has no impact on the
+hash (@pxref{Invoking guix archive}).
+@c FIXME: Replace xref above with xref to an ``Archive'' section when
+@c it exists.
+
@end table
@node Invoking guix refresh
diff --git a/guix/nar.scm b/guix/nar.scm
index 89a71302e0..9ba6e4ce2c 100644
--- a/guix/nar.scm
+++ b/guix/nar.scm
@@ -195,8 +195,8 @@ sub-directories of FILE as needed."
(write-string "target" p)
(write-string (readlink f) p))
(else
- (raise (condition (&message (message "ENOSYS"))
- (&nar-error)))))
+ (raise (condition (&message (message "unsupported file type"))
+ (&nar-error (file f) (port port))))))
(write-string ")" p))))
(define (restore-file port file)
diff --git a/guix/scripts/hash.scm b/guix/scripts/hash.scm
index 4e66aa0f3e..ea8c2ada6b 100644
--- a/guix/scripts/hash.scm
+++ b/guix/scripts/hash.scm
@@ -20,12 +20,14 @@
(define-module (guix scripts hash)
#:use-module (guix base32)
#:use-module (guix hash)
+ #:use-module (guix nar)
#:use-module (guix ui)
#:use-module (guix utils)
#:use-module (rnrs io ports)
#:use-module (rnrs files)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:export (guix-hash))
@@ -43,10 +45,12 @@
(display (_ "Usage: guix hash [OPTION] FILE
Return the cryptographic hash of FILE.
-Supported formats: 'nix-base32' (default), 'base32', and 'base16'
-('hex' and 'hexadecimal' can be used as well).\n"))
+Supported formats: 'nix-base32' (default), 'base32', and 'base16' ('hex'
+and 'hexadecimal' can be used as well).\n"))
(format #t (_ "
-f, --format=FMT write the hash in the given format"))
+ (format #t (_ "
+ -r, --recursive compute the hash on FILE recursively"))
(newline)
(display (_ "
-h, --help display this help and exit"))
@@ -73,6 +77,9 @@ Supported formats: 'nix-base32' (default), 'base32', and 'base16'
(alist-cons 'format fmt-proc
(alist-delete 'format result))))
+ (option '(#\r "recursive") #f #f
+ (lambda (opt name arg result)
+ (alist-cons 'recursive? #t result)))
(option '(#\h "help") #f #f
(lambda args
@@ -107,12 +114,22 @@ Supported formats: 'nix-base32' (default), 'base32', and 'base16'
(reverse opts)))
(fmt (assq-ref opts 'format)))
+ (define (file-hash file)
+ ;; Compute the hash of FILE.
+ ;; Catch and gracefully report possible '&nar-error' conditions.
+ (with-error-handling
+ (if (assoc-ref opts 'recursive?)
+ (let-values (((port get-hash) (open-sha256-port)))
+ (write-file file port)
+ (flush-output-port port)
+ (get-hash))
+ (call-with-input-file file port-sha256))))
+
(match args
((file)
(catch 'system-error
(lambda ()
- (format #t "~a~%"
- (fmt (call-with-input-file file port-sha256))))
+ (format #t "~a~%" (fmt (file-hash file))))
(lambda args
(leave (_ "~a~%")
(strerror (system-error-errno args))))))
diff --git a/tests/guix-hash.sh b/tests/guix-hash.sh
index 53325ce1f4..23df01d417 100644
--- a/tests/guix-hash.sh
+++ b/tests/guix-hash.sh
@@ -1,5 +1,5 @@
# GNU Guix --- Functional package management for GNU
-# Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+# Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
#
# This file is part of GNU Guix.
#
@@ -22,7 +22,27 @@
guix hash --version
+tmpdir="guix-hash-$$"
+trap 'rm -rf "$tmpdir"' EXIT
+
test `guix hash /dev/null` = 0mdqa9w1p6cmli6976v4wi0sw9r4p5prkj7lzfd1877wk11c9c73
test `guix hash -f nix-base32 /dev/null` = 0mdqa9w1p6cmli6976v4wi0sw9r4p5prkj7lzfd1877wk11c9c73
test `guix hash -f hex /dev/null` = e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
test `guix hash -f base32 /dev/null` = 4oymiquy7qobjgx36tejs35zeqt24qpemsnzgtfeswmrw6csxbkq
+
+mkdir "$tmpdir"
+echo -n executable > "$tmpdir/exe"
+chmod +x "$tmpdir/exe"
+( cd "$tmpdir" ; ln -s exe symlink )
+mkdir "$tmpdir/subdir"
+
+test `guix hash -r "$tmpdir"` = 10k1lw41wyrjf9mxydi0is5nkpynlsvgslinics4ppir13g7d74p
+
+# Without '-r', this should fail.
+if guix hash "$tmpdir"
+then false; else true; fi
+
+# This should fail because /dev/null is a character device, which
+# the archive format doesn't support.
+if guix hash -r /dev/null
+then false; else true; fi