[PATCH v2] docs: Add fuller accounting of make check prerequisites

[Glenn Washburn <development@efficientek.com>]

Many of the prerequisites for exercising the full `make check' test suite
have not been documented. This adds them along with a note that some tests
require elevated privileges to run.

Also add documentation on trusted sources for finding cross compiling tool
chains.

Signed-off-by: Glenn Washburn <development@efficientek.com>
---
Changes since v1

* Add section on where to find cross compiling tool chains per Daniel's request.
* Missed needed modules loop and we need fuse for ntfs and exfat (though on
  very recent kernels the exfat module would be better to use).
* Also, romfs, isofs, and squashfs are not required either because we don't
  mount or use these images in loopback devices.
* Need exfat-fuse for all but recent kernels. And exfatprogs is better
  than exfat-utils (more compete support). But its a newer package, so
  may not be available on older systems. 
* g++ package is needed to build some tests.
* Gawk is not strictly needed, in that testing will work, but the process
  will complain without it.

---
Interdiff against v1:
  diff --git a/INSTALL b/INSTALL
  index 25e3740ff..bb086a902 100644
  --- a/INSTALL
  +++ b/INSTALL
  @@ -46,6 +46,11 @@ need the following.
   * Autoconf 2.63 or later
   * Automake 1.11 or later
   
  +Cross compiling tool chains can be found at the following trusted sites:
  +
  +* https://mirrors.kernel.org/pub/tools/crosstool/
  +* https://toolchains.bootlin.com/
  +
   Prerequisites for make-check:
   
   * qemu, specifically the binary 'qemu-system-ARCH' where ARCH is the
  @@ -57,14 +62,17 @@ Prerequisites for make-check:
   * mtools, FAT tools for EFI platforms
   
   * If running a Linux kernel the following modules must be loaded:
  -  - minix, hfs, mac-roman, hfsplus, exfat, reiserfs, xfs, f2fs, btrfs,
  -    nilfs2, jfs, fat, ext4, udf, romfs, isofs, squashfs
  +  - fuse, loop, minix, hfs, mac-roman, hfsplus, reiserfs, xfs, f2fs, btrfs,
  +    nilfs2, jfs, fat, ext4, udf
  +  - On newer kernels, the exfat kernel modules may be used instead of the
  +    exfat FUSE filesystem.
   * The following are debian named packages required mostly for the full
     suite of filesystem testing (but some are needed by other tests as well
     - tar, cpio, gzip, lzop, xz-utils, parted, util-linux, squashfs-tools,
  -    zfs-fuse, dosfstools, exfat-utils, ntfs-3g, e2fsprogs, btrfs-progs,
  +    zfs-fuse, dosfstools, exfatprogs, ntfs-3g, e2fsprogs, btrfs-progs,
       xfsprogs, hfsprogs, recode, jfsutils, reiserfsprogs, udftools,
  -    nilfs-tools, f2fs-tools, genromfs, attr
  +    nilfs-tools, f2fs-tools, genromfs, attr, g++, gawk
  +  - exfat-fuse, if not using the exfat kernel module
   
   Note that `make check' will run and many tests may complete successfully
   with only a subset of these prerequisites. However, some tests may be

 INSTALL | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/INSTALL b/INSTALL
index 5e152b71f..bb086a902 100644
--- a/INSTALL
+++ b/INSTALL
@@ -46,10 +46,37 @@ need the following.
 * Autoconf 2.63 or later
 * Automake 1.11 or later
 
+Cross compiling tool chains can be found at the following trusted sites:
+
+* https://mirrors.kernel.org/pub/tools/crosstool/
+* https://toolchains.bootlin.com/
+
 Prerequisites for make-check:
 
-* qemu, specifically the binary 'qemu-system-i386'
+* qemu, specifically the binary 'qemu-system-ARCH' where ARCH is the
+  architecture GRUB has been built for
+* OVMF, for EFI platforms
+* OpenBIOS, for ieee1275 platforms
 * xorriso 1.2.9 or later, for grub-mkrescue and grub-shell
+* wamerican, for grub-fs-tester
+* mtools, FAT tools for EFI platforms
+
+* If running a Linux kernel the following modules must be loaded:
+  - fuse, loop, minix, hfs, mac-roman, hfsplus, reiserfs, xfs, f2fs, btrfs,
+    nilfs2, jfs, fat, ext4, udf
+  - On newer kernels, the exfat kernel modules may be used instead of the
+    exfat FUSE filesystem.
+* The following are debian named packages required mostly for the full
+  suite of filesystem testing (but some are needed by other tests as well
+  - tar, cpio, gzip, lzop, xz-utils, parted, util-linux, squashfs-tools,
+    zfs-fuse, dosfstools, exfatprogs, ntfs-3g, e2fsprogs, btrfs-progs,
+    xfsprogs, hfsprogs, recode, jfsutils, reiserfsprogs, udftools,
+    nilfs-tools, f2fs-tools, genromfs, attr, g++, gawk
+  - exfat-fuse, if not using the exfat kernel module
+
+Note that `make check' will run and many tests may complete successfully
+with only a subset of these prerequisites. However, some tests may be
+skipped or fail due to missing prerequisites.
 
 Configuring the GRUB
 ====================
@@ -101,7 +128,8 @@ The simplest way to compile this package is:
   6. Type `make' to compile the package.
 
   7. Optionally, type `make check' to run any self-tests that come with
-     the package.
+     the package.  Note that many of the tests require root privileges in
+     order to run.
 
   8. Type `make install' to install the programs and any data files and
      documentation.
-- 
2.27.0