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[[!meta copyright="Copyright © 2011, 2012 Free Software Foundation, Inc."]]
[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled [[GNU Free Documentation
License|/fdl]]."]]"""]]
[[!tag open_issue_porting]]
$ git-new-workdir /media/kepler-data/home/thomas/tmp/source/binutils/git master master
fatal: Out of memory? mmap failed: No such device
$ echo $?
128
$ showtrans /media/kepler-data
/hurd/nfs kepler.schwinge.homeip.net:/media/data
With `sh -x`:
[...]
+ ln -s /media/kepler-data/home/thomas/tmp/source/binutils/git/.git/remotes master/.git/remotes
+ ln -s /media/kepler-data/home/thomas/tmp/source/binutils/git/.git/rr-cache master/.git/rr-cache
+ ln -s /media/kepler-data/home/thomas/tmp/source/binutils/git/.git/svn master/.git/svn
+ cd master
+ cp /media/kepler-data/home/thomas/tmp/source/binutils/git/.git/HEAD .git/HEAD
+ git checkout -f master
fatal: Out of memory? mmap failed: No such device
As one can easily guess (and confirm with [[hurd/debugging/rpctrace]]), `git`
tries to [[glibc/mmap]] a file via the [[hurd/translator/nfs]] translator, this
fails, and it isn't prepared to cope with that:
[...]
88->dir_lookup (".git/objects/pack/pack-37ca560e7877fa0cc6e5ddcd556aa73e5a3e3f40.idx" 2049 0) = 0 3 "/media/kepler-data/home/thomas/tmp/source/binutils/git/.git/objects/pack/pack-37" (null)
62->dir_lookup ("media/kepler-data/home/thomas/tmp/source/binutils/git/.git/objects/pack/pack-37c" 2049 0) = 0 1 "/home/thomas/tmp/source/binutils/git/.git/objects/pack/pack-37ca560e7877fa0cc6e5" 61
61->dir_lookup ("home/thomas/tmp/source/binutils/git/.git/objects/pack/pack-37ca560e7877fa0cc6e5d" 2049 0) = 0 1 "" 84
task3741-> 3206 (pn{ 33}) = 0
84->term_getctty () = 0xfffffed1 ((ipc/mig) bad request message ID)
84->io_stat_request () = 0 {1 704 0 36308992 0 0 -1 33060 1 1000 1000 4712 0 1307711395 0 1307657003 0 1307657003 0 4096 16 0 1000 0 0 100663296 1836017780 29537 0 0 0 0}
84->io_map_request () = 0x4000002d (Operation not supported)
84->io_map_request () = 0x4000002d (Operation not supported)
76->io_write_request ("fatal: Out of memory? mmap failed: No such device
" -1) = 0 50
64->proc_mark_exit_request (32768 0) = 0
task3741-> 2008 () = 0
Child 3741 exited with 128
This is the [[libnetfs: `io_map`|open_issues/libnetfs_io_map]] issue.
There is a `NO_MMAP` conditional in Git's source code, but it is a compile-time
conditional. The fallback code in `compat/mmap.c:git_mmap` only supports
`MAP_PRIVATE`, and simply `pread`s in the requested portion of a file. This
could be made a runtime fallback, too.
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