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guix: download: Add support for git repositories.

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* guix/scripts/download.scm (git-download-to-store*): Add new variable.
(copy-recursively-without-dot-git): New variable.
(git-download-to-file): Add new variable.
(show-help): Add 'git', 'commit', 'branch' and 'recursive'options
help message.
(%default-options): Add default value for 'git-reference' and
'recursive' options.
(%options): Add 'git', 'commit', 'branch' and 'recursive' command
line options.
(guix-download) [hash]: Compute hash with 'file-hash*' instead of
'port-hash' from (gcrypt hash) module. This allows us to compute
hashes for directories.
* doc/guix.texi (Invoking guix-download): Add @item entries for
`git', `commit', `branch' and `recursive' options. Add a paragraph in
the introduction.
* tests/guix-download.sh: New tests. Move variables and trap definition
to the top of the file.

Change-Id: Ic2c428dca4cfcb0d4714ed361a4c46609339140a
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Reviewed-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
This commit is contained in:
Romain GARBAGE 2024-01-22 11:32:55 +01:00 committed by Maxim Cournoyer
parent 1bdeec5d66
commit 916fb5347a
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GPG key ID: 1260E46482E63562
3 changed files with 222 additions and 13 deletions
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23
doc/guix.texi
View file

@ -14021,6 +14021,9 @@ the certificates of X.509 authorities from the directory pointed to by
the @env{SSL_CERT_DIR} environment variable (@pxref{X.509
Certificates}), unless @option{--no-check-certificate} is used.
Alternatively, @command{guix download} can also retrieve a Git
repository, possibly a specific commit, tag, or branch.
The following options are available:
@table @code
@ -14045,6 +14048,26 @@ URL, which makes you vulnerable to ``man-in-the-middle'' attacks.
@itemx -o @var{file}
Save the downloaded file to @var{file} instead of adding it to the
store.
@item --git
@itemx -g
Checkout the Git repository at the latest commit on the default branch.
@item --commit=@var{commit-or-tag}
Checkout the Git repository at @var{commit-or-tag}.
@var{commit-or-tag} can be either a tag or a commit defined in the Git
repository.
@item --branch=@var{branch}
Checkout the Git repository at @var{branch}.
The repository will be checked out at the latest commit of @var{branch},
which must be a valid branch of the Git repository.
@item --recursive
@itemx -r
Recursively clone the Git repository.
@end table
@node Invoking guix hash

167
guix/scripts/download.scm
View file

@ -22,17 +22,24 @@ (define-module (guix scripts download)
#:use-module (guix scripts)
#:use-module (guix store)
#:use-module (gcrypt hash)
#:use-module (guix hash)
#:use-module (guix base16)
#:use-module (guix base32)
#:autoload (guix base64) (base64-encode)
#:use-module ((guix download) #:hide (url-fetch))
#:use-module ((guix git)
#:select (latest-repository-commit
update-cached-checkout
with-git-error-handling))
#:use-module ((guix build download)
#:select (url-fetch))
#:use-module (guix build utils)
#:use-module ((guix progress)
#:select (current-terminal-columns))
#:use-module ((guix build syscalls)
#:select (terminal-columns))
#:use-module (web uri)
#:use-module (ice-9 ftw)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
@ -54,6 +61,57 @@ (define (download-to-file url file)
(url-fetch url file #:mirrors %mirrors)))
file))
;; This is a simplified version of 'copy-recursively'.
;; It allows us to filter out the ".git" subfolder.
;; TODO: Remove when 'copy-recursively' supports '#:select?'.
(define (copy-recursively-without-dot-git source destination)
(define strip-source
(let ((len (string-length source)))
(lambda (file)
(substring file len))))
(file-system-fold (lambda (file stat result) ; enter?
(not (string-suffix? "/.git" file)))
(lambda (file stat result) ; leaf
(let ((dest (string-append destination
(strip-source file))))
(case (stat:type stat)
((symlink)
(let ((target (readlink file)))
(symlink target dest)))
(else
(copy-file file dest)))))
(lambda (dir stat result) ; down
(let ((target (string-append destination
(strip-source dir))))
(mkdir-p target)))
(const #t) ; up
(const #t) ; skip
(lambda (file stat errno result)
(format (current-error-port) "i/o error: ~a: ~a~%"
file (strerror errno))
#f)
#t
source))
(define (git-download-to-file url file reference recursive?)
"Download the git repo at URL to file, checked out at REFERENCE.
REFERENCE must be a pair argument as understood by 'latest-repository-commit'.
Return FILE."
;; 'libgit2' doesn't support the URL format generated by 'uri->string' so
;; we have to do a little fixup. Dropping completely the 'file:' protocol
;; part gives better performance.
(let ((url (cond ((string-prefix? "file://" url)
(string-drop url (string-length "file://")))
((string-prefix? "file:" url)
(string-drop url (string-length "file:")))
(else url))))
(copy-recursively-without-dot-git
(with-git-error-handling
(update-cached-checkout url #:ref reference #:recursive? recursive?))
file))
file)
(define (ensure-valid-store-file-name name)
"Replace any character not allowed in a store name by an underscore."
@ -67,17 +125,46 @@ (define valid
name))
(define* (download-to-store* url #:key (verify-certificate? #t))
(define* (download-to-store* url
#:key (verify-certificate? #t)
#:allow-other-keys)
(with-store store
(download-to-store store url
(ensure-valid-store-file-name (basename url))
#:verify-certificate? verify-certificate?)))
(define* (git-download-to-store* url
reference
recursive?
#:key (verify-certificate? #t))
"Download the git repository at URL to the store, checked out at REFERENCE.
URL must specify a protocol (i.e https:// or file://), REFERENCE must be a
pair argument as understood by 'latest-repository-commit'."
;; Ensure the URL string is properly formatted when using the 'file'
;; protocol: URL is generated using 'uri->string', which returns
;; "file:/path/to/file" instead of "file:///path/to/file", which in turn
;; makes 'git-download-to-store' fail.
(let* ((file? (string-prefix? "file:" url))
(url (if (and file?
(not (string-prefix? "file:///" url)))
(string-append "file://"
(string-drop url (string-length "file:")))
url)))
(with-store store
;; TODO: Verify certificate support and deactivation.
(with-git-error-handling
(latest-repository-commit store
url
#:recursive? recursive?
#:ref reference)))))
(define %default-options
;; Alist of default option values.
`((format . ,bytevector->nix-base32-string)
(hash-algorithm . ,(hash-algorithm sha256))
(verify-certificate? . #t)
(git-reference . #f)
(recursive? . #f)
(download-proc . ,download-to-store*)))
(define (show-help)
@ -97,6 +184,19 @@ (define (show-help)
do not validate the certificate of HTTPS servers "))
(format #t (G_ "
-o, --output=FILE download to FILE"))
(format #t (G_ "
-g, --git download the default branch's latest commit of the
Git repository at URL"))
(format #t (G_ "
--commit=COMMIT-OR-TAG
download the given commit or tag of the Git
repository at URL"))
(format #t (G_ "
--branch=BRANCH download the given branch of the Git repository
at URL"))
(format #t (G_ "
-r, --recursive download a Git repository recursively"))
(newline)
(display (G_ "
-h, --help display this help and exit"))
@ -105,6 +205,13 @@ (define (show-help)
(newline)
(show-bug-report-information))
(define (add-git-download-option result)
(alist-cons 'download-proc
;; XXX: #:verify-certificate? currently ignored.
(lambda* (url #:key verify-certificate? ref recursive?)
(git-download-to-store* url ref recursive?))
(alist-delete 'download result)))
(define %options
;; Specifications of the command-line options.
(list (option '(#\f "format") #t #f
@ -136,10 +243,46 @@ (define fmt-proc
(alist-cons 'verify-certificate? #f result)))
(option '(#\o "output") #t #f
(lambda (opt name arg result)
(alist-cons 'download-proc
(lambda* (url #:key verify-certificate?)
(download-to-file url arg))
(alist-delete 'download result))))
(let* ((git
(assoc-ref result 'git-reference)))
(if git
(alist-cons 'download-proc
(lambda* (url
#:key
verify-certificate?
ref
recursive?)
(git-download-to-file
url
arg
(assoc-ref result 'git-reference)
recursive?))
(alist-delete 'download result))
(alist-cons 'download-proc
(lambda* (url
#:key verify-certificate?
#:allow-other-keys)
(download-to-file url arg))
(alist-delete 'download result))))))
(option '(#\g "git") #f #f
(lambda (opt name arg result)
;; Ignore this option if 'commit' or 'branch' has
;; already been provided
(if (assoc-ref result 'git-reference)
result
(alist-cons 'git-reference '()
(add-git-download-option result)))))
(option '("commit") #t #f
(lambda (opt name arg result)
(alist-cons 'git-reference `(tag-or-commit . ,arg)
(add-git-download-option result))))
(option '("branch") #t #f
(lambda (opt name arg result)
(alist-cons 'git-reference `(branch . ,arg)
(add-git-download-option result))))
(option '(#\r "recursive") #f #f
(lambda (opt name arg result)
(alist-cons 'recursive? #t result)))
(option '(#\h "help") #f #f
(lambda args
@ -183,12 +326,14 @@ (define (parse-options)
(terminal-columns)))
(fetch (uri->string uri)
#:verify-certificate?
(assq-ref opts 'verify-certificate?))))
(hash (call-with-input-file
(or path
(leave (G_ "~a: download failed~%")
arg))
(cute port-hash (assoc-ref opts 'hash-algorithm) <>)))
(assq-ref opts 'verify-certificate?)
#:ref (assq-ref opts 'git-reference)
#:recursive? (assq-ref opts 'recursive?))))
(hash (let* ((path* (or path
(leave (G_ "~a: download failed~%")
arg))))
(file-hash* path*
#:algorithm (assoc-ref opts 'hash-algorithm))))
(fmt (assq-ref opts 'format)))
(format #t "~a~%~a~%" path (fmt hash))
#t)))

45
tests/guix-download.sh
View file

@ -16,6 +16,12 @@
# You should have received a copy of the GNU General Public License
# along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
# Define some files/folders needed for the tests.
output="t-download-$$"
test_git_repo="$(mktemp -d)"
output_dir="t-archive-dir-$$"
trap 'rm -rf "$test_git_repo" ; rm -f "$output" ; rm -rf "$output_dir"' EXIT
#
# Test the `guix download' command-line utility.
#
@ -36,8 +42,6 @@ guix download "file://$abs_top_srcdir/README"
guix download "$abs_top_srcdir/README"
# This one too, even if it cannot talk to the daemon.
output="t-download-$$"
trap 'rm -f "$output"' EXIT
GUIX_DAEMON_SOCKET="/nowhere" guix download -o "$output" \
"file://$abs_top_srcdir/README"
cmp "$output" "$abs_top_srcdir/README"
@ -45,4 +49,41 @@ cmp "$output" "$abs_top_srcdir/README"
# This one should fail.
guix download "file:///does-not-exist" "file://$abs_top_srcdir/README" && false
# Test git support with local repository.
# First, create a dummy git repo in the temporary directory.
(
cd $test_git_repo
git init
touch test
git config user.name "User"
git config user.email "user@domain"
git add test
git commit -m "Commit"
git tag -a -m "v1" v1
)
# Extract commit number.
commit=$((cd $test_git_repo && git log) | head -n 1 | cut -f2 -d' ')
# We expect that guix hash is working properly or at least that the output of
# 'guix download' is consistent with 'guix hash'.
expected_hash=$(guix hash -rx $test_git_repo)
# Test the different options
for option in "" "--commit=$commit" "--commit=v1" "--branch=master"
do
command_output="$(guix download --git $option "file://$test_git_repo")"
computed_hash="$(echo $command_output | cut -f2 -d' ')"
store_path="$(echo $command_output | cut -f1 -d' ')"
[ "$expected_hash" = "$computed_hash" ]
diff -r -x ".git" $test_git_repo $store_path
done
# Should fail.
guix download --git --branch=non_existent "file://$test_git_repo" && false
# Same but download to file instead of store.
guix download --git "file://$test_git_repo" -o $output_dir
diff -r -x ".git" $test_git_repo $output_dir
exit 0