mirror of
https://github.com/JakeHillion/drgn.git
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8b264f8823
drgn was originally my side project, but for awhile now it's also been my work project. Update the copyright headers to reflect this, and add a copyright header to various files that were missing it.
80 lines
2.5 KiB
Bash
Executable File
80 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
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# Copyright (c) Facebook, Inc. and its affiliates.
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# SPDX-License-Identifier: GPL-3.0+
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# drgn depends heavily on elfutils. In particular, we need a recent version,
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# potentially with some patches that may not be released or even merged yet. We
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# can't depend on the distribution's elfutils package, so instead we include
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# our own.
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#
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# This script imports elfutils from another repository as a subtree. This is
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# similar to git-subtree(1), except that we always replace the subtree instead
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# of merging it. The upstream commit and additional commit subjects are
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# recorded in the commit message. The additional patches are saved in
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# elfutils/PATCHES for posterity.
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#
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# Note that we should strive not to have a hard fork of elfutils; everything in
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# here should be on its way upstream, and the patches should be rebased/pruned
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# frequently.
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set -e
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# The upstream elfutils repository. This can be set as an environment variable
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# to override the default.
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: ${ELFUTILS_REPO:="git://sourceware.org/git/elfutils.git"}
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ELFUTILS_PATH=libdrgn/elfutils
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if [ $# -ne 1 -a $# -ne 2 ]; then
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echo "usage: $0 repository [refspec]" >&2
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exit 1
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fi
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GIT_DIR="$(git rev-parse --absolute-git-dir)"
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cdup="$(git rev-parse --show-cdup)"
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cd "$cdup"
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# Fetch the upstream elfutils repository to compare against.
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git fetch -- "$ELFUTILS_REPO" master
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# Fetch the commit.
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git fetch --append -- "$@"
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# Now, the first line of FETCH_HEAD is $ELFUTILS_REPO/master and the second
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# line is the commit.
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commit="$(sed -n '2s/ .*$//p' "$GIT_DIR/FETCH_HEAD")"
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# Find which elfutils commit the commit is based on.
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if ! base="$(git merge-base FETCH_HEAD "$commit")"; then
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echo "\"$(git rev-list --oneline -1 "$commit")\" is not based on elfutils" >&2
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exit 1
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fi
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# Import the commit as a subtree.
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git rm -q --ignore-unmatch -r "$ELFUTILS_PATH/"
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git read-tree -u --prefix="$ELFUTILS_PATH/" "$commit"
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# Generate the log file. This is basically git log -p, but with plumbing
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# commands so that the format is consistent.
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git rev-list "$base".."$commit" | while read -r commit; do
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git diff-tree --pretty=medium -p "$commit"
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done > "$ELFUTILS_PATH/PATCHES"
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git add "$ELFUTILS_PATH/PATCHES"
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# Commit the change.
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commit_message="Update elfutils
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Based on:
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$(git rev-list --oneline -1 "$base")"
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if [ "$commit" = "$base" ]; then
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commit_message="$commit_message
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With no patches."
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else
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commit_message="$commit_message
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With the following patches:
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$(git rev-list --oneline --reverse "$base".."$commit" |
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cut -d ' ' -f 1 --complement)"
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fi
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git commit -e -m "$commit_message" "$ELFUTILS_PATH/"
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