diff options
Diffstat (limited to 'guix/ftp-client.scm')
| -rw-r--r-- | guix/ftp-client.scm | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/guix/ftp-client.scm b/guix/ftp-client.scm index a6a54a4d9c..22d4c7dde2 100644 --- a/guix/ftp-client.scm +++ b/guix/ftp-client.scm @@ -121,15 +121,18 @@ seconds to wait for the connection to succeed." (raise-error errno))))) (connect s sockaddr))) -(define* (ftp-open host #:optional (port 21) #:key timeout) +(define* (ftp-open host #:optional (port "ftp") #:key timeout) "Open an FTP connection to HOST on PORT (a service-identifying string, or a TCP port number), and return it. When TIMEOUT is not #f, it must be a (possibly inexact) number denoting the maximum duration in seconds to wait for the connection to complete; passed TIMEOUT, an ETIMEDOUT error is raised." - ;; Use 21 as the default PORT instead of "ftp", to avoid depending on - ;; libc's NSS, which is not available during bootstrap. + ;; Using "ftp" for PORT instead of 21 allows 'getaddrinfo' to return only + ;; TCP/IP addresses (otherwise it would return SOCK_DGRAM and SOCK_RAW + ;; addresses as well.) With our bootstrap Guile, which includes a + ;; statically-linked NSS, resolving "ftp" works well, as long as + ;; /etc/services is available. (define addresses (getaddrinfo host |