file-systems: Remove 'title' field and add <file-system-label>.

The 'title' field was easily overlooked and was an endless source of
confusion.  Now, the value of the 'device' field is self-contained.

* gnu/system/file-systems.scm (<file-system>): Change constructor name
to '%file-system'.
[title]: Remove.
(<file-system-label>): New record type with printer.
(report-deprecation, device-expression)
(process-file-system-declaration, file-system): New macros.
(file-system-title): New procedure.
(file-system->spec, spec->file-system): Adjust to handle
<file-system-label>.
* gnu/system.scm (bootable-kernel-arguments): Add case for
'file-system-label?'.
(read-boot-parameters): Likewise.
(mapped-device-user): Avoid 'file-system-title'.
(fs->boot-device): Remove.
(operating-system-boot-parameters): Use 'file-system-device' instead of
'fs->boot-device'.
(device->sexp): Add case for 'file-system-label?'.
* gnu/bootloader/grub.scm (grub-root-search): Add case for
'file-system-label?'.
* gnu/system/examples/bare-bones.tmpl,
gnu/system/examples/beaglebone-black.tmpl,
gnu/system/examples/lightweight-desktop.tmpl,
gnu/system/examples/vm-image.tmpl: Remove uses of 'title'.
* gnu/system/vm.scm (virtualized-operating-system): Remove uses of
'file-system-title'.
* guix/scripts/system.scm (check-file-system-availability): Likewise,
and adjust fix-it hint.
(check-initrd-modules)[file-system-/dev]: Likewise.
* gnu/build/file-systems.scm (canonicalize-device-spec): Remove 'title'
parameter.
[canonical-title]: Remove.
Match on SPEC's type rather than on CANONICAL-TITLE.
(mount-file-system): Adjust caller.
* gnu/build/linux-boot.scm (boot-system): Interpret ROOT here.
* gnu/services/base.scm (file-system->fstab-entry): Remove use of
'file-system-title'.
* doc/guix.texi (File Systems): Remove documentation of the 'title'
field.  Rewrite documentation of 'device' and document
'file-system-label'.

4 files changed, 4 insertions, 9 deletions

diff --git a/gnu/system/examples/bare-bones.tmpl b/gnu/system/examples/bare-bones.tmpl
index 7e0c8fbee0..cb6d2623db 100644
--- a/gnu/system/examples/bare-bones.tmpl
+++ b/gnu/system/examples/bare-bones.tmpl
@@ -16,8 +16,7 @@
                 (bootloader grub-bootloader)
                 (target "/dev/sdX")))
   (file-systems (cons (file-system
-                        (device "my-root")
-                        (title 'label)
+                        (device (file-system-label "my-root"))
                         (mount-point "/")
                         (type "ext4"))
                       %base-file-systems))
diff --git a/gnu/system/examples/beaglebone-black.tmpl b/gnu/system/examples/beaglebone-black.tmpl
index 97201330c7..d1130c76b6 100644
--- a/gnu/system/examples/beaglebone-black.tmpl
+++ b/gnu/system/examples/beaglebone-black.tmpl
@@ -20,8 +20,7 @@
   (initrd-modules (cons "omap_hsmmc" %base-initrd-modules))
 
   (file-systems (cons (file-system
-                        (device "my-root")
-                        (title 'label)
+                        (device (file-system-label "my-root"))
                         (mount-point "/")
                         (type "ext4"))
                       %base-file-systems))
diff --git a/gnu/system/examples/lightweight-desktop.tmpl b/gnu/system/examples/lightweight-desktop.tmpl
index 65a8ee1809..360ee62ffe 100644
--- a/gnu/system/examples/lightweight-desktop.tmpl
+++ b/gnu/system/examples/lightweight-desktop.tmpl
@@ -20,13 +20,11 @@
   ;; Assume the target root file system is labelled "my-root",
   ;; and the EFI System Partition has UUID 1234-ABCD.
   (file-systems (cons* (file-system
-                         (device "my-root")
-                         (title 'label)
+                         (device (file-system-label "my-root"))
                          (mount-point "/")
                          (type "ext4"))
                        (file-system
                          (device (uuid "1234-ABCD" 'fat))
-                         (title 'uuid)
                          (mount-point "/boot/efi")
                          (type "vfat"))
                        %base-file-systems))
diff --git a/gnu/system/examples/vm-image.tmpl b/gnu/system/examples/vm-image.tmpl
index ce3653c8b4..36e272722d 100644
--- a/gnu/system/examples/vm-image.tmpl
+++ b/gnu/system/examples/vm-image.tmpl
@@ -31,8 +31,7 @@ partprobe, and then 2) resizing the filesystem with resize2fs.\n"))
                (target "/dev/sda")
                (terminal-outputs '(console))))
   (file-systems (cons (file-system
-                        (device "my-root")
-                        (title 'label)
+                        (device (file-system-label "my-root"))
                         (mount-point "/")
                         (type "ext4"))
                       %base-file-systems))