That git fixed a memory leak that could cause an OOM during the upgrade.
Most git-annex builds have a new enough git already.
OSX git was upgraded with brew.
Linux i386ancient build's git was too old. Upgrading it to a fixed
git didn't work (due to the newer git not working with the old ssh,
https://bugs.chromium.org/p/git/issues/detail?id=7 )
Choices to deal with that were:
* Somehow make direct mode upgrade work with the old git, avoiding its
OOM problem. One way would be to switch the repo to indirect mode
first, and so upgrade to a repo with locked files. Not good when
the filesystem does not support symlinks.
* backport the OOM fix from git 2.22
(And do what about the version number so git-annex knows it's fixed?)
* backport openssh (and possibly more stuff)
* move the i386ancient build to at least Debian stretch (still backporting git)
But this will make it no longer work with some of the ancient kernels it
targets.
Of those, backporting the OOM fix seemed the best approach. Put "oomfix"
in the git version number to indicate it.
I have not automated building the git backport, so here's the patch I
used:
diff -ur orig/git-2.1.4/convert.c git-2.1.4/convert.c
--- orig/git-2.1.4/convert.c 2014-12-18 18:42:18.000000000 +0000
+++ git-2.1.4/convert.c 2019-08-29 20:05:04.371872338 +0100
@@ -404,7 +404,7 @@
if (start_async(&async))
return 0; /* error was already reported */
- if (strbuf_read(&nbuf, async.out, len) < 0) {
+ if (strbuf_read(&nbuf, async.out, 0) < 0) {
error("read from external filter %s failed", cmd);
ret = 0;
}
diff -ur orig/git-2.1.4/GIT-VERSION-GEN git-2.1.4/GIT-VERSION-GEN
--- orig/git-2.1.4/GIT-VERSION-GEN 2014-12-18 18:42:18.000000000 +0000
+++ git-2.1.4/GIT-VERSION-GEN 2019-08-29 20:06:39.132743228 +0100
@@ -1,7 +1,7 @@
#!/bin/sh
GVF=GIT-VERSION-FILE
-DEF_VER=v2.1.4
+DEF_VER=v2.1.4.oomfix
LF='
'
diff -ur orig/git-2.1.4/configure git-2.1.4/configure
--- orig/git-2.1.4/configure 2014-12-18 18:42:19.000000000 +0000
+++ git-2.1.4/configure 2019-08-29 20:27:45.896380015 +0100
@@ -580,8 +580,8 @@
# Identity of this package.
PACKAGE_NAME='git'
PACKAGE_TARNAME='git'
-PACKAGE_VERSION='2.1.4'
-PACKAGE_STRING='git 2.1.4'
+PACKAGE_VERSION='2.1.4.oomfix'
+PACKAGE_STRING='git 2.1.4.oomfix'
PACKAGE_BUGREPORT='git@vger.kernel.org'
PACKAGE_URL=''
diff -ur orig/git-2.1.4/version git-2.1.4/version
--- orig/git-2.1.4/version 2014-12-18 18:42:19.000000000 +0000
+++ git-2.1.4/version 2019-08-29 20:06:17.572545210 +0100
@@ -1 +1 @@
-2.1.4
+2.1.4.oomfix
Whether or not there's a false index, it can't Restage here.
When there's a false index, restaging would alter it and not the real
index, but it fails anyway because that index is locked.
When there's not a false index, the index is locked, and so restaging
can't alter it.
If a direct mode file is deleted or modified, and there are no other
files containing the content, the content was lost. That's a normal
thing that can happen in direct mode, but not in v7, so the upgrade
code has to notice it in order for the location log to be accurate.
No longer used. The only possible user of it would be code in
Upgrade.V5, so I verified that the parts of Annex.Content it used were
not used to manipulate direct mode files.
tryGitConfigRead may run ensureInitialized first, but when checkuuid = false,
that is skipped. So, make sure it's run before all onLocal actions.
ensureInitialized is inexpensive, so the extra call by tryGitConfigRead
is not a big deal. But since it was easy to do, I made it only be run
once by all calls to onLocal.
A few calls to onLocal didn't call ensureInitialized before. Notably,
the checkPresent action didn't, and does now.
That means that there's a guarantee that any necessary repo upgrades
will be run before the checkPresent action runs in the repo. Which is
important especially for the direct mode conversion, because without
that upgrade, the checkPresent action would need to support direct mode
still. Now I can remove the last bits of direct mode support in
Annex.Content without worrying that it will break accessing remotes
that have not been upgraded.
This does necessarily mean that checkPresent needs to write to the disk
when performing such a repo upgrade. The other remote actions already
did, so retrieval from a readonly remote that needed to be upgraded would
fail. Having checkPresent also fail doesn't seem like a large reversion,
especially since it already failed in the default case when checkuuid = true.
Three reasons:
* Committing as part of an upgrade is very unusual and unexpected.
* The commit was failing with a weird error message when done during an
automatic upgrade.
* Let me remove more of that sweet^Whorrible direct mode code.
