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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Rasmus Villemoes](/assets/img/avatar_default.png)
commit 548b8b5168
upstream.
When building for an embedded target using Yocto, we're sometimes
observing that the version string that gets built into vmlinux (and
thus what uname -a reports) differs from the path under /lib/modules/
where modules get installed in the rootfs, but only in the length of
the -gabc123def suffix. Hence modprobe always fails.
The problem is that Yocto has the concept of "sstate" (shared state),
which allows different developers/buildbots/etc. to share build
artifacts, based on a hash of all the metadata that went into building
that artifact - and that metadata includes all dependencies (e.g. the
compiler used etc.). That normally works quite well; usually a clean
build (without using any sstate cache) done by one developer ends up
being binary identical to a build done on another host. However, one
thing that can cause two developers to end up with different builds
[and thus make one's vmlinux package incompatible with the other's
kernel-dev package], which is not captured by the metadata hashing, is
this `git describe`: The output of that can be affected by
(1) git version: before 2.11 git defaulted to a minimum of 7, since
2.11 (git.git commit e6c587) the default is dynamic based on the
number of objects in the repo
(2) hence even if both run the same git version, the output can differ
based on how many remotes are being tracked (or just lots of local
development branches or plain old garbage)
(3) and of course somebody could have a core.abbrev config setting in
~/.gitconfig
So in order to avoid `uname -a` output relying on such random details
of the build environment which are rather hard to ensure are
consistent between developers and buildbots, make sure the abbreviated
sha1 always consists of exactly 12 hex characters. That is consistent
with the current rule for -stable patches, and is almost always enough
to identify the head commit unambigously - in the few cases where it
does not, the v5.4.3-00021- prefix would certainly nail it down.
[Adapt to `` vs $() differences between 5.4 and upstream.]
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
194 lines
4.7 KiB
Bash
Executable file
194 lines
4.7 KiB
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# This scripts adds local version information from the version
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# control systems git, mercurial (hg) and subversion (svn).
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#
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# If something goes wrong, send a mail the kernel build mailinglist
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# (see MAINTAINERS) and CC Nico Schottelius
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# <nico-linuxsetlocalversion -at- schottelius.org>.
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#
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#
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usage() {
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echo "Usage: $0 [--save-scmversion] [srctree]" >&2
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exit 1
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}
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scm_only=false
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srctree=.
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if test "$1" = "--save-scmversion"; then
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scm_only=true
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shift
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fi
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if test $# -gt 0; then
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srctree=$1
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shift
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fi
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if test $# -gt 0 -o ! -d "$srctree"; then
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usage
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fi
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scm_version()
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{
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local short
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short=false
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cd "$srctree"
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if test -e .scmversion; then
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cat .scmversion
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return
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fi
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if test "$1" = "--short"; then
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short=true
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fi
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# Check for git and a git repo.
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if test -z "$(git rev-parse --show-cdup 2>/dev/null)" &&
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head=$(git rev-parse --verify HEAD 2>/dev/null); then
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# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore
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# it, because this version is defined in the top level Makefile.
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if [ -z "`git describe --exact-match 2>/dev/null`" ]; then
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# If only the short version is requested, don't bother
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# running further git commands
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if $short; then
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echo "+"
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return
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fi
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# If we are past a tagged commit (like
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# "v2.6.30-rc5-302-g72357d5"), we pretty print it.
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#
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# Ensure the abbreviated sha1 has exactly 12
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# hex characters, to make the output
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# independent of git version, local
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# core.abbrev settings and/or total number of
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# objects in the current repository - passing
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# --abbrev=12 ensures a minimum of 12, and the
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# awk substr() then picks the 'g' and first 12
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# hex chars.
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if atag="$(git describe --abbrev=12 2>/dev/null)"; then
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echo "$atag" | awk -F- '{printf("-%05d-%s", $(NF-1),substr($(NF),0,13))}'
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# If we don't have a tag at all we print -g{commitish},
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# again using exactly 12 hex chars.
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else
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head="$(echo $head | cut -c1-12)"
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printf '%s%s' -g $head
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fi
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fi
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# Is this git on svn?
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if git config --get svn-remote.svn.url >/dev/null; then
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printf -- '-svn%s' "`git svn find-rev $head`"
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fi
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# Check for uncommitted changes.
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# First, with git-status, but --no-optional-locks is only
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# supported in git >= 2.14, so fall back to git-diff-index if
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# it fails. Note that git-diff-index does not refresh the
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# index, so it may give misleading results. See
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# git-update-index(1), git-diff-index(1), and git-status(1).
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if {
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git --no-optional-locks status -uno --porcelain 2>/dev/null ||
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git diff-index --name-only HEAD
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} | grep -qvE '^(.. )?scripts/package'; then
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printf '%s' -dirty
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fi
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# All done with git
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return
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fi
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# Check for mercurial and a mercurial repo.
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if test -d .hg && hgid=`hg id 2>/dev/null`; then
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# Do we have an tagged version? If so, latesttagdistance == 1
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if [ "`hg log -r . --template '{latesttagdistance}'`" == "1" ]; then
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id=`hg log -r . --template '{latesttag}'`
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printf '%s%s' -hg "$id"
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else
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tag=`printf '%s' "$hgid" | cut -d' ' -f2`
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if [ -z "$tag" -o "$tag" = tip ]; then
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id=`printf '%s' "$hgid" | sed 's/[+ ].*//'`
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printf '%s%s' -hg "$id"
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fi
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fi
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# Are there uncommitted changes?
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# These are represented by + after the changeset id.
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case "$hgid" in
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*+|*+\ *) printf '%s' -dirty ;;
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esac
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# All done with mercurial
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return
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fi
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# Check for svn and a svn repo.
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if rev=`LANG= LC_ALL= LC_MESSAGES=C svn info 2>/dev/null | grep '^Last Changed Rev'`; then
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rev=`echo $rev | awk '{print $NF}'`
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printf -- '-svn%s' "$rev"
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# All done with svn
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return
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fi
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}
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collect_files()
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{
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local file res
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for file; do
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case "$file" in
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*\~*)
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continue
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;;
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esac
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if test -e "$file"; then
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res="$res$(cat "$file")"
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fi
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done
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echo "$res"
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}
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if $scm_only; then
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if test ! -e .scmversion; then
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res=$(scm_version)
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echo "$res" >.scmversion
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fi
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exit
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fi
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if test -e include/config/auto.conf; then
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. include/config/auto.conf
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else
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echo "Error: kernelrelease not valid - run 'make prepare' to update it" >&2
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exit 1
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fi
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# localversion* files in the build and source directory
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res="$(collect_files localversion*)"
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if test ! "$srctree" -ef .; then
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res="$res$(collect_files "$srctree"/localversion*)"
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fi
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# CONFIG_LOCALVERSION and LOCALVERSION (if set)
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res="${res}${CONFIG_LOCALVERSION}${LOCALVERSION}"
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# scm version string if not at a tagged commit
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if test "$CONFIG_LOCALVERSION_AUTO" = "y"; then
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# full scm version string
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res="$res$(scm_version)"
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else
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# append a plus sign if the repository is not in a clean
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# annotated or signed tagged state (as git describe only
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# looks at signed or annotated tags - git tag -a/-s) and
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# LOCALVERSION= is not specified
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if test "${LOCALVERSION+set}" != "set"; then
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scm=$(scm_version --short)
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res="$res${scm:++}"
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fi
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fi
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echo "$res"
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