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Taylor Blau 177c0d6e63 midx: infer preferred pack when not given one 
In 9218c6a40c (midx: allow marking a pack as preferred, 2021-03-30), the
multi-pack index code learned how to select a pack which all duplicate
objects are selected from. That is, if an object appears in multiple
packs, select the copy in the preferred pack before breaking ties
according to the other rules like pack mtime and readdir() order.

Not specifying a preferred pack can cause serious problems with
multi-pack reachability bitmaps, because these bitmaps rely on having at
least one pack from which all duplicates are selected. Not having such a
pack causes problems with the code in pack-objects to reuse packs
verbatim (e.g., that code assumes that a delta object in a chunk of pack
sent verbatim will have its base object sent from the same pack).

So why does not marking a pack preferred cause problems here? The reason
is roughly as follows:

  - Ties are broken (when handling duplicate objects) by sorting
    according to midx_oid_compare(), which sorts objects by OID,
    preferred-ness, pack mtime, and finally pack ID (more on that
    later).

  - The psuedo pack-order (described in
    Documentation/technical/pack-format.txt under the section
    "multi-pack-index reverse indexes") is computed by
    midx_pack_order(), and sorts by pack ID and pack offset, with
    preferred packs sorting first.

  - But! Pack IDs come from incrementing the pack count in
    add_pack_to_midx(), which is a callback to
    for_each_file_in_pack_dir(), meaning that pack IDs are assigned in
    readdir() order.

When specifying a preferred pack, all of that works fine, because
duplicate objects are correctly resolved in favor of the copy in the
preferred pack, and the preferred pack sorts first in the object order.

"Sorting first" is critical, because the bitmap code relies on finding
out which pack holds the first object in the MIDX's pseudo pack-order to
determine which pack is preferred.

But if we didn't specify a preferred pack, and the pack which comes
first in readdir() order does not also have the lowest timestamp, then
it's possible that that pack (the one that sorts first in pseudo-pack
order, which the bitmap code will treat as the preferred one) did *not*
have all duplicate objects resolved in its favor, resulting in breakage.

The fix is simple: pick a (semi-arbitrary, non-empty) preferred pack
when none was specified. This forces that pack to have duplicates
resolved in its favor, and (critically) to sort first in pseudo-pack
order.  Unfortunately, testing this behavior portably isn't possible,
since it depends on readdir() order which isn't guaranteed by POSIX.

(Note that multi-pack reachability bitmaps have yet to be implemented;
so in that sense this patch is fixing a bug which does not yet exist.
But by having this patch beforehand, we can prevent the bug from ever
materializing.)

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-09-01 10:58:43 -07:00
.github Merge branch 'js/ci-check-whitespace-updates' 2021-08-02 14:06:40 -07:00
block-sha1
builtin pack-bitmap-write.c: gracefully fail to write non-closed bitmaps 2021-08-24 13:21:13 -07:00
ci ci/install-dependencies: handle "sparse" job package installs 2021-07-26 15:20:51 -07:00
compat mingw: align symlinks-related rmdir() behavior with Linux 2021-08-02 15:10:58 -07:00
contrib Merge branch 'ab/attribute-format' 2021-07-28 13:17:59 -07:00
Documentation midx: reject empty --preferred-pack's 2021-09-01 10:58:43 -07:00
ewah
git-gui
gitk-git
gitweb
mergetools mergetools/kdiff3: make kdiff3 work on Windows too 2021-06-08 10:26:16 +09:00
negotiator
perl Merge branch 'ab/send-email-optim' 2021-07-22 13:05:54 -07:00
po l10n: sv.po: Update Swedish translation (5230t0f0u) 2021-08-16 06:54:20 +08:00
ppc
refs Merge branch 'hn/refs-debug-empty-prefix' 2021-07-28 13:18:04 -07:00
sha1collisiondetection@855827c583
sha1dc
sha256
t midx: reject empty --preferred-pack's 2021-09-01 10:58:43 -07:00
templates
trace2 Merge branch 'ab/trace2-squelch-gcc-warning' 2021-06-14 13:33:28 +09:00
xdiff Merge branch 'ab/pickaxe-pcre2' 2021-07-13 16:52:50 -07:00
.cirrus.yml
.clang-format
.editorconfig
.gitattributes
.gitignore
.gitmodules
.mailmap
.travis.yml
.tsan-suppressions
abspath.c
aclocal.m4
add-interactive.c
add-interactive.h
add-patch.c *.c static functions: add missing __attribute__((format)) 2021-07-13 15:20:20 -07:00
advice.c
advice.h advice.h: add missing __attribute__((format)) & fix usage 2021-07-13 15:20:20 -07:00
alias.c
alias.h
alloc.c
alloc.h
apply.c string-list.h users: change to use *_{nodup,dup}() 2021-07-01 12:32:22 -07:00
apply.h
archive-tar.c
archive-zip.c
archive.c string-list.h users: change to use *_{nodup,dup}() 2021-07-01 12:32:22 -07:00
archive.h
attr.c *: fix typos which duplicate a word 2021-06-14 10:16:06 +09:00
attr.h
banned.h
base85.c
bisect.c
bisect.h
blame.c
blame.h
blob.c
blob.h
bloom.c
bloom.h
branch.c
branch.h
builtin.h
bulk-checkin.c bulk-checkin: make buffer reuse more obvious and safer 2021-06-11 13:01:22 +09:00
bulk-checkin.h
bundle.c bundle: remove "ref_list" in favor of string-list.c API 2021-07-06 12:10:17 -07:00
bundle.h bundle: remove "ref_list" in favor of string-list.c API 2021-07-06 12:10:17 -07:00
cache-tree.c Merge branch 'ds/commit-and-checkout-with-sparse-index' 2021-08-04 13:28:53 -07:00
cache-tree.h
cache.h Merge branch 'jt/bulk-prefetch' 2021-08-02 14:06:42 -07:00
cbtree.c oidtree: a crit-bit tree for odb_loose_cache 2021-07-07 21:28:04 -07:00
cbtree.h oidtree: avoid unaligned access to crit-bit tree 2021-08-15 13:13:50 -07:00
chdir-notify.c
chdir-notify.h
check-builtins.sh
check_bindir
checkout.c
checkout.h
chunk-format.c
chunk-format.h
CODE_OF_CONDUCT.md
color.c
color.h
column.c
column.h
combine-diff.c Merge branch 'ab/pickaxe-pcre2' 2021-07-13 16:52:50 -07:00
command-list.txt
commit-graph.c Merge branch 'ab/attribute-format' 2021-07-28 13:17:59 -07:00
commit-graph.h
commit-reach.c
commit-reach.h
commit-slab-decl.h
commit-slab-impl.h
commit-slab.h
commit.c Merge branch 'ds/gender-neutral-doc' 2021-07-16 17:42:53 -07:00
commit.h
common-main.c
config.c Merge branch 'ds/gender-neutral-doc' 2021-07-16 17:42:53 -07:00
config.h Merge branch 'ds/gender-neutral-doc' 2021-07-16 17:42:53 -07:00
config.mak.dev
config.mak.in
config.mak.uname Merge branch 'js/config-mak-windows-pcre-fix' 2021-07-16 17:42:47 -07:00
configure.ac
connect.c
connect.h
connected.c
connected.h
convert.c convert: release strbuf to avoid leak 2021-07-26 12:19:20 -07:00
convert.h
copy.c
COPYING
credential.c *.c *_init(): define in terms of corresponding *_INIT macro 2021-07-01 12:32:22 -07:00
credential.h *.h: move some *_INIT to designated initializers 2021-07-01 12:31:45 -07:00
csum-file.c Merge branch 'tb/midx-use-checksum' 2021-07-16 17:42:46 -07:00
csum-file.h Merge branch 'tb/midx-use-checksum' 2021-07-16 17:42:46 -07:00
ctype.c
daemon.c
date.c comments: avoid using the gender of our users 2021-06-16 11:25:11 +09:00
decorate.c
decorate.h
delta-islands.c
delta-islands.h
delta.h
detect-compiler
diff-delta.c
diff-lib.c diff-lib: handle index diffs with sparse dirs 2021-07-14 13:42:49 -07:00
diff-merges.c Revert 'diff-merges: let "-m" imply "-p"' 2021-08-09 13:52:01 -07:00
diff-merges.h
diff-no-index.c
diff.c Merge branch 'ab/pickaxe-pcre2' 2021-08-06 12:52:15 -07:00
diff.h
diffcore-break.c
diffcore-delta.c
diffcore-order.c
diffcore-pickaxe.c
diffcore-rename.c Merge branch 'ah/plugleaks' 2021-08-04 13:28:52 -07:00
diffcore-rotate.c
diffcore.h Merge branch 'en/ort-perf-batch-11' 2021-06-14 13:33:27 +09:00
dir-iterator.c
dir-iterator.h
dir.c use fspathhash() everywhere 2021-07-30 12:14:27 -07:00
dir.h Merge branch 'ew/many-alternate-optim' 2021-07-28 13:17:57 -07:00
editor.c
entry.c string-list.h users: change to use *_{nodup,dup}() 2021-07-01 12:32:22 -07:00
entry.h
environment.c environment: move strbuf into block to plug leak 2021-07-26 12:19:20 -07:00
environment.h
exec-cmd.c
exec-cmd.h
fetch-negotiator.c
fetch-negotiator.h
fetch-pack.c
fetch-pack.h
fmt-merge-msg.c fmt-merge-msg: free newly allocated temporary strings when done 2021-07-26 12:19:19 -07:00
fmt-merge-msg.h
fsck.c
fsck.h
fsmonitor.c
fsmonitor.h
fuzz-commit-graph.c
fuzz-pack-headers.c
fuzz-pack-idx.c
generate-cmdlist.sh
generate-configlist.sh
gettext.c *.c static functions: add missing __attribute__((format)) 2021-07-13 15:20:20 -07:00
gettext.h
git-add--interactive.perl
git-archimport.perl
git-bisect.sh
git-compat-util.h Merge branch 'ew/mmap-failures' 2021-07-16 17:42:47 -07:00
git-cvsexportcommit.perl
git-cvsimport.perl
git-cvsserver.perl *: fix typos which duplicate a word 2021-06-14 10:16:06 +09:00
git-difftool--helper.sh
git-filter-branch.sh
git-instaweb.sh
git-merge-octopus.sh
git-merge-one-file.sh
git-merge-resolve.sh
git-mergetool--lib.sh
git-mergetool.sh
git-p4.py git-p4: fix failed submit by skip non-text data files 2021-06-28 09:49:30 -07:00
git-quiltimport.sh
git-rebase--preserve-merges.sh
git-request-pull.sh
git-send-email.perl Merge branch 'ab/send-email-optim' 2021-07-22 13:05:54 -07:00
git-sh-i18n.sh
git-sh-setup.sh
git-submodule.sh Merge branch 'ar/submodule-add' 2021-08-04 13:28:52 -07:00
git-svn.perl
GIT-VERSION-GEN Git 2.33 2021-08-16 12:15:44 -07:00
git-web--browse.sh
git.c midx: disallow running outside of a repository 2021-09-01 10:58:43 -07:00
git.rc
gpg-interface.c
gpg-interface.h
graph.c graph: improve grammar of "invalid color" error message 2021-06-15 12:54:26 +09:00
graph.h
grep.c Merge branch 'rs/grep-parser-fix' 2021-07-13 16:52:53 -07:00
grep.h
hash-lookup.c
hash-lookup.h
hash.h oidtree: avoid unaligned access to crit-bit tree 2021-08-15 13:13:50 -07:00
hashmap.c
hashmap.h
help.c
help.h
hex.c
http-backend.c
http-fetch.c
http-push.c
http-walker.c
http.c
http.h
ident.c
imap-send.c Merge branch 'ab/attribute-format' 2021-07-28 13:17:59 -07:00
INSTALL
iterator.h
json-writer.c *.c *_init(): define in terms of corresponding *_INIT macro 2021-07-01 12:32:22 -07:00
json-writer.h *.h: move some *_INIT to designated initializers 2021-07-01 12:31:45 -07:00
khash.h khash: clarify that allocations never fail 2021-07-06 13:07:50 -07:00
kwset.c
kwset.h
levenshtein.c
levenshtein.h
LGPL-2.1
line-log.c
line-log.h
line-range.c
line-range.h
linear-assignment.c
linear-assignment.h
list-objects-filter-options.c
list-objects-filter-options.h
list-objects-filter.c
list-objects-filter.h
list-objects.c bitmaps: don't recurse into trees already in the bitmap 2021-06-15 11:13:11 +09:00
list-objects.h
list.h
ll-merge.c ll_union_merge(): rename path_unused parameter 2021-06-11 12:37:33 +09:00
ll-merge.h
lockfile.c
lockfile.h
log-tree.c load_ref_decorations(): fix decoration with tags 2021-07-14 10:11:02 -07:00
log-tree.h
ls-refs.c
ls-refs.h
mailinfo.c Merge branch 'ar/mailinfo-memcmp-to-skip-prefix' 2021-07-08 13:15:03 -07:00
mailinfo.h
mailmap.c *.c static functions: add missing __attribute__((format)) 2021-07-13 15:20:20 -07:00
mailmap.h
Makefile Merge branch 'ab/getcwd-test' 2021-08-04 13:28:55 -07:00
match-trees.c
mem-pool.c
mem-pool.h
merge-blobs.c
merge-blobs.h
merge-ort-wrappers.c
merge-ort-wrappers.h
merge-ort.c Merge branch 'en/ort-perf-batch-14' 2021-08-04 13:28:54 -07:00
merge-ort.h
merge-recursive.c use fspathhash() everywhere 2021-07-30 12:14:27 -07:00
merge-recursive.h
merge.c dir.[ch]: replace dir_init() with DIR_INIT 2021-07-01 12:32:22 -07:00
mergesort.c
mergesort.h
midx.c midx: infer preferred pack when not given one 2021-09-01 10:58:43 -07:00
midx.h
name-hash.c
notes-cache.c
notes-cache.h
notes-merge.c
notes-merge.h
notes-utils.c
notes-utils.h
notes.c
notes.h
object-file.c Merge branch 'cb/many-alternate-optim-fixup' 2021-08-11 12:36:17 -07:00
object-name.c oidtree: a crit-bit tree for odb_loose_cache 2021-07-07 21:28:04 -07:00
object-store.h object-store: avoid extra ';' from KHASH_INIT 2021-08-09 09:01:30 -07:00
object.c Merge branch 'jk/log-decorate-optim' 2021-07-28 13:17:58 -07:00
object.h object.h: add lookup_object_by_type() function 2021-06-28 20:30:18 -07:00
oid-array.c
oid-array.h
oidmap.c
oidmap.h
oidset.c
oidset.h
oidtree.c oidtree: avoid unaligned access to crit-bit tree 2021-08-15 13:13:50 -07:00
oidtree.h oidtree: a crit-bit tree for odb_loose_cache 2021-07-07 21:28:04 -07:00
pack-bitmap-write.c pack-bitmap-write.c: free existing bitmaps 2021-08-24 13:21:13 -07:00
pack-bitmap.c pack-bitmap.c: harden 'test_bitmap_walk()' to check type bitmaps 2021-08-24 13:21:13 -07:00
pack-bitmap.h pack-bitmap-write.c: gracefully fail to write non-closed bitmaps 2021-08-24 13:21:13 -07:00
pack-check.c csum-file: introduce checksum_valid() 2021-06-28 20:36:17 -07:00
pack-objects.c
pack-objects.h
pack-revindex.c
pack-revindex.h
pack-write.c
pack.h
packfile.c xmmap: inform Linux users of tuning knobs on ENOMEM 2021-06-29 23:14:25 -07:00
packfile.h
pager.c pager: avoid setting COLUMNS when we're guessing its value 2021-06-28 10:42:10 -07:00
parallel-checkout.c
parallel-checkout.h
parse-options-cb.c
parse-options.c parse-options: don't complete option aliases by default 2021-07-16 11:31:44 -07:00
parse-options.h
patch-delta.c
patch-ids.c
patch-ids.h
path.c
path.h
pathspec.c
pathspec.h Merge branch 'ds/gender-neutral-doc' 2021-07-16 17:42:53 -07:00
pkt-line.c Merge branch 'dl/packet-read-response-end-fix' 2021-07-28 13:17:56 -07:00
pkt-line.h
preload-index.c
pretty.c log: avoid loading decorations for userformats that don't need it 2021-06-28 20:30:17 -07:00
pretty.h log: avoid loading decorations for userformats that don't need it 2021-06-28 20:30:17 -07:00
prio-queue.c
prio-queue.h
progress.c
progress.h
promisor-remote.c Merge branch 'jt/partial-clone-submodule-1' 2021-07-16 17:42:53 -07:00
promisor-remote.h promisor-remote: support per-repository config 2021-06-28 09:57:42 -07:00
prompt.c
prompt.h
protocol-caps.c
protocol-caps.h protocol-caps.h: add newline at end of file 2021-06-08 10:08:41 +09:00
protocol.c
protocol.h
prune-packed.c
prune-packed.h
quote.c
quote.h *.h: add a few missing __attribute__((format)) 2021-07-13 15:20:20 -07:00
range-diff.c Merge branch 'ab/pickaxe-pcre2' 2021-07-13 16:52:50 -07:00
range-diff.h
reachable.c object.h: add lookup_object_by_type() function 2021-06-28 20:30:18 -07:00
reachable.h
read-cache.c Merge branch 'ah/plugleaks' 2021-08-04 13:28:52 -07:00
README.md
rebase-interactive.c
rebase-interactive.h
rebase.c
rebase.h
ref-filter.c Merge branch 'ah/plugleaks' 2021-08-04 13:28:52 -07:00
ref-filter.h
reflog-walk.c
reflog-walk.h
refs.c Merge branch 'hn/refs-iterator-peel-returns-boolean' 2021-07-16 17:42:49 -07:00
refs.h
refspec.c
refspec.h
RelNotes The first batch post Git 2.32 2021-06-10 12:04:27 +09:00
remote-curl.c Merge branch 'dl/packet-read-response-end-fix' 2021-07-28 13:17:56 -07:00
remote.c *: fix typos which duplicate a word 2021-06-14 10:16:06 +09:00
remote.h
replace-object.c
replace-object.h
repo-settings.c
repository.c promisor-remote: support per-repository config 2021-06-28 09:57:42 -07:00
repository.h promisor-remote: support per-repository config 2021-06-28 09:57:42 -07:00
rerere.c
rerere.h
reset.c reset: clear_unpack_trees_porcelain to plug leak 2021-07-26 12:19:21 -07:00
reset.h
resolve-undo.c
resolve-undo.h
revision.c add_pending_object_with_path(): work around "gcc -O3" complaint 2021-06-11 12:45:37 +09:00
revision.h Merge branch 'bc/rev-list-without-commit-line' 2021-07-22 13:05:56 -07:00
run-command.c Merge branch 'jt/partial-clone-submodule-1' 2021-07-16 17:42:53 -07:00
run-command.h Merge branch 'jt/partial-clone-submodule-1' 2021-07-16 17:42:53 -07:00
SECURITY.md
send-pack.c send-pack.c: move "no refs in common" abort earlier 2021-06-30 14:57:22 -07:00
send-pack.h
sequencer.c *.c static functions: add missing __attribute__((format)) 2021-07-13 15:20:20 -07:00
sequencer.h
serve.c Merge branch 'dl/packet-read-response-end-fix' 2021-07-28 13:17:56 -07:00
serve.h
server-info.c *.c static functions: add missing __attribute__((format)) 2021-07-13 15:20:20 -07:00
setup.c Merge branch 'jt/partial-clone-submodule-1' 2021-07-16 17:42:53 -07:00
sh-i18n--envsubst.c builtins + test helpers: use return instead of exit() in cmd_* 2021-06-09 09:15:58 +09:00
sha1dc_git.c
sha1dc_git.h
shallow.c
shallow.h
shell.c builtins + test helpers: use return instead of exit() in cmd_* 2021-06-09 09:15:58 +09:00
shortlog.h
sideband.c sideband: don't lose clear-to-eol at packet boundary 2021-06-17 14:11:36 +09:00
sideband.h
sigchain.c
sigchain.h
simple-ipc.h
sparse-index.c sparse-index: recompute cache-tree 2021-07-14 15:05:53 -07:00
sparse-index.h
split-index.c split-index: use oideq instead of memcmp to compare object_id's 2021-06-15 12:07:56 +09:00
split-index.h
stable-qsort.c
strbuf.c *.c *_init(): define in terms of corresponding *_INIT macro 2021-07-01 12:32:22 -07:00
strbuf.h Merge branch 'ab/attribute-format' 2021-07-28 13:17:59 -07:00
streaming.c
streaming.h
string-list.c string-list.[ch]: add a string_list_init_{nodup,dup}() 2021-07-01 12:32:22 -07:00
string-list.h string-list.[ch]: add a string_list_init_{nodup,dup}() 2021-07-01 12:32:22 -07:00
strmap.c *.c *_init(): define in terms of corresponding *_INIT macro 2021-07-01 12:32:22 -07:00
strmap.h
strvec.c *.c *_init(): define in terms of corresponding *_INIT macro 2021-07-01 12:32:22 -07:00
strvec.h
sub-process.c
sub-process.h
submodule-config.c
submodule-config.h
submodule.c run-command: refactor subprocess env preparation 2021-06-28 09:58:01 -07:00
submodule.h
symlinks.c
tag.c
tag.h
tar.h
tempfile.c
tempfile.h
thread-utils.c
thread-utils.h
tmp-objdir.c
tmp-objdir.h
trace.c
trace.h
trace2.c
trace2.h
trailer.c
trailer.h
transport-helper.c
transport-internal.h
transport.c Merge branch 'ab/struct-init' 2021-07-16 17:42:53 -07:00
transport.h
tree-diff.c
tree-walk.c
tree-walk.h
tree.c
tree.h
unicode-width.h
unimplemented.sh
unix-socket.c
unix-socket.h
unix-stream-server.c
unix-stream-server.h
unpack-trees.c Merge branch 'ds/commit-and-checkout-with-sparse-index' 2021-08-04 13:28:53 -07:00
unpack-trees.h
upload-pack.c
upload-pack.h
url.c
url.h
urlmatch.c
urlmatch.h
usage.c
userdiff.c userdiff: add support for C# record types 2021-06-16 17:06:20 +09:00
userdiff.h
utf8.c
utf8.h
varint.c
varint.h
version.c
version.h
versioncmp.c
walker.c
walker.h
wildmatch.c
wildmatch.h
worktree.c *.c static functions: add missing __attribute__((format)) 2021-07-13 15:20:20 -07:00
worktree.h
wrap-for-bin.sh
wrapper.c
write-or-die.c fsync(): be prepared to see EINTR 2021-06-05 22:13:40 +09:00
ws.c
wt-status.c Merge branch 'ds/status-with-sparse-index' 2021-07-28 13:18:02 -07:00
wt-status.h status: skip sparse-checkout percentage with sparse-index 2021-07-14 13:42:49 -07:00
xdiff-interface.c Merge branch 'ab/pickaxe-pcre2' 2021-07-13 16:52:50 -07:00
xdiff-interface.h
zlib.c

README.md

Build status

Git - fast, scalable, distributed revision control system

Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.

Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.

Please read the file INSTALL for installation instructions.

Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.

See Documentation/gittutorial.txt to get started, then see Documentation/giteveryday.txt for a useful minimum set of commands, and Documentation/git-<commandname>.txt for documentation of each command. If git has been correctly installed, then the tutorial can also be read with man gittutorial or git help tutorial, and the documentation of each command with man git-<commandname> or git help <commandname>.

CVS users may also want to read Documentation/gitcvs-migration.txt (man gitcvs-migration or git help cvs-migration if git is installed).

The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org (read Documentation/SubmittingPatches for instructions on patch submission). To subscribe to the list, send an email with just "subscribe git" in the body to majordomo@vger.kernel.org. The mailing list archives are available at https://lore.kernel.org/git/, http://marc.info/?l=git and other archival sites.

Issues which are security relevant should be disclosed privately to the Git Security mailing list git-security@googlegroups.com.

The maintainer frequently sends the "What's cooking" reports that list the current status of various development topics to the mailing list. The discussion following them give a good reference for project status, development direction and remaining tasks.

The name "git" was given by Linus Torvalds when he wrote the very first version. He described the tool as "the stupid content tracker" and the name as (depending on your mood):

  • random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant.
  • stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
  • "global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
  • "goddamn idiotic truckload of sh*t": when it breaks