64a072e357
Source of this change goes back to 2009 and original version of
fetchgit at 205fb0c87e.
The nondeterminism is really caused by changing .git so leave other
files alone as they might be interesting.
Note: this causes a hash mismatch with Hydra's version of Git Plugin
which we should fix to comply.
394 lines
10 KiB
Bash
Executable file
394 lines
10 KiB
Bash
Executable file
#! /usr/bin/env bash
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set -e -o pipefail
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url=
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rev=
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expHash=
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hashType=$NIX_HASH_ALGO
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deepClone=$NIX_PREFETCH_GIT_DEEP_CLONE
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leaveDotGit=$NIX_PREFETCH_GIT_LEAVE_DOT_GIT
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fetchSubmodules=
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builder=
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branchName=$NIX_PREFETCH_GIT_BRANCH_NAME
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# populated by clone_user_rev()
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fullRev=
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humanReadableRev=
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commitDate=
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if test -n "$deepClone"; then
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deepClone=true
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else
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deepClone=false
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fi
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if test "$leaveDotGit" != 1; then
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leaveDotGit=
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else
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leaveDotGit=true
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fi
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usage(){
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echo >&2 "syntax: nix-prefetch-git [options] [URL [REVISION [EXPECTED-HASH]]]
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Options:
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--out path Path where the output would be stored.
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--url url Any url understand by 'git clone'.
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--rev ref Any sha1 or references (such as refs/heads/master)
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--hash h Expected hash.
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--deepClone Clone the entire repository.
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--no-deepClone Make a shallow clone of just the required ref.
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--leave-dotGit Keep the .git directories.
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--fetch-submodules Fetch submodules.
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--builder Clone as fetchgit does, but url, rev, and out option are mandatory.
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"
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exit 1
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}
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argi=0
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argfun=""
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for arg; do
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if test -z "$argfun"; then
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case $arg in
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--out) argfun=set_out;;
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--url) argfun=set_url;;
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--rev) argfun=set_rev;;
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--hash) argfun=set_hashType;;
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--branch-name) argfun=set_branchName;;
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--deepClone) deepClone=true;;
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--quiet) QUIET=true;;
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--no-deepClone) deepClone=false;;
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--leave-dotGit) leaveDotGit=true;;
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--fetch-submodules) fetchSubmodules=true;;
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--builder) builder=true;;
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--help) usage; exit;;
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*)
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argi=$(($argi + 1))
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case $argi in
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1) url=$arg;;
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2) rev=$arg;;
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3) expHash=$arg;;
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*) exit 1;;
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esac
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;;
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esac
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else
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case $argfun in
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set_*)
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var=$(echo $argfun | sed 's,^set_,,')
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eval $var=$arg
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;;
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esac
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argfun=""
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fi
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done
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if test -z "$url"; then
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usage
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fi
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init_remote(){
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local url=$1
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git init
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git remote add origin $url
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( [ -n "$http_proxy" ] && git config http.proxy $http_proxy ) || true
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}
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# Return the reference of an hash if it exists on the remote repository.
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ref_from_hash(){
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local hash=$1
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git ls-remote origin | sed -n "\,$hash\t, { s,\(.*\)\t\(.*\),\2,; p; q}"
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}
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# Return the hash of a reference if it exists on the remote repository.
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hash_from_ref(){
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local ref=$1
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git ls-remote origin | sed -n "\,\t$ref, { s,\(.*\)\t\(.*\),\1,; p; q}"
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}
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# Returns a name based on the url and reference
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#
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# This function needs to be in sync with nix's fetchgit implementation
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# of urlToName() to re-use the same nix store paths.
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url_to_name(){
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local url=$1
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local ref=$2
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# basename removes the / and .git suffixes
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local base=$(basename "$url" .git)
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if [[ $ref =~ ^[a-z0-9]+$ ]]; then
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echo "$base-${ref:0:7}"
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else
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echo $base
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fi
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}
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# Fetch everything and checkout the right sha1
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checkout_hash(){
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local hash="$1"
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local ref="$2"
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if test -z "$hash"; then
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hash=$(hash_from_ref $ref)
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fi
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git fetch -t ${builder:+--progress} origin || return 1
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git checkout -b $branchName $hash || return 1
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}
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# Fetch only a branch/tag and checkout it.
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checkout_ref(){
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local hash="$1"
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local ref="$2"
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if "$deepClone"; then
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# The caller explicitly asked for a deep clone. Deep clones
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# allow "git describe" and similar tools to work. See
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# http://thread.gmane.org/gmane.linux.distributions.nixos/3569
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# for a discussion.
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return 1
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fi
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if test -z "$ref"; then
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ref=$(ref_from_hash $hash)
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fi
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if test -n "$ref"; then
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# --depth option is ignored on http repository.
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git fetch ${builder:+--progress} --depth 1 origin +"$ref" || return 1
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git checkout -b $branchName FETCH_HEAD || return 1
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else
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return 1
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fi
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}
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# Update submodules
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init_submodules(){
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# Add urls into .git/config file
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git submodule init
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# list submodule directories and their hashes
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git submodule status |
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while read l; do
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# checkout each submodule
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local hash=$(echo $l | awk '{print substr($1,2)}')
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local dir=$(echo $l | awk '{print $2}')
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local name=$(
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git config -f .gitmodules --get-regexp submodule\..*\.path |
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sed -n "s,^\(.*\)\.path $dir\$,\\1,p")
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local url=$(git config --get ${name}.url)
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clone "$dir" "$url" "$hash" ""
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done
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}
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clone(){
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local top=$(pwd)
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local dir="$1"
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local url="$2"
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local hash="$3"
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local ref="$4"
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cd $dir
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# Initialize the repository.
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init_remote "$url"
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# Download data from the repository.
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checkout_ref "$hash" "$ref" ||
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checkout_hash "$hash" "$ref" || (
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echo 1>&2 "Unable to checkout $hash$ref from $url."
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exit 1
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)
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# Checkout linked sources.
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if test -n "$fetchSubmodules"; then
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init_submodules
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fi
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if [ -z "$builder" -a -f .topdeps ]; then
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if tg help 2>&1 > /dev/null
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then
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echo "populating TopGit branches..."
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tg remote --populate origin
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else
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echo "WARNING: would populate TopGit branches but TopGit is not available" >&2
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echo "WARNING: install TopGit to fix the problem" >&2
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fi
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fi
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cd $top
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}
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# Remove all remote branches, remove tags not reachable from HEAD, do a full
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# repack and then garbage collect unreferenced objects.
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make_deterministic_repo(){
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local repo="$1"
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# run in sub-shell to not touch current working directory
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(
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cd "$repo"
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# Remove files that contain timestamps or otherwise have non-deterministic
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# properties.
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rm -rf .git/logs/ .git/hooks/ .git/index .git/FETCH_HEAD .git/ORIG_HEAD \
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.git/refs/remotes/origin/HEAD .git/config
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# Remove all remote branches.
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git branch -r | while read branch; do
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git branch -rD "$branch" >&2
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done
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# Remove tags not reachable from HEAD. If we're exactly on a tag, don't
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# delete it.
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maybe_tag=$(git tag --points-at HEAD)
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git tag --contains HEAD | while read tag; do
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if [ "$tag" != "$maybe_tag" ]; then
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git tag -d "$tag" >&2
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fi
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done
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# Do a full repack. Must run single-threaded, or else we lose determinism.
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git config pack.threads 1
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git repack -A -d -f
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rm -f .git/config
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# Garbage collect unreferenced objects.
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git gc --prune=all
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)
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}
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_clone_user_rev() {
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local dir="$1"
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local url="$2"
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local rev="${3:-HEAD}"
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# Perform the checkout.
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case "$rev" in
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HEAD|refs/*)
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clone "$dir" "$url" "" "$rev" 1>&2;;
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*)
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if test -z "$(echo $rev | tr -d 0123456789abcdef)"; then
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clone "$dir" "$url" "$rev" "" 1>&2
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else
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echo 1>&2 "Bad commit hash or bad reference."
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exit 1
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fi;;
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esac
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fullRev="$(cd $dir && (git rev-parse $rev 2> /dev/null || git rev-parse refs/heads/$branchName) | tail -n1)"
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humanReadableRev="$(cd $dir && (git describe $fullRev 2> /dev/null || git describe --tags $fullRev 2> /dev/null || echo -- none --))"
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commitDate="$(cd $dir && git show --no-patch --pretty=%ci $fullRev)"
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# Allow doing additional processing before .git removal
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eval "$NIX_PREFETCH_GIT_CHECKOUT_HOOK"
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if test -z "$leaveDotGit"; then
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echo "removing \`.git'..." >&2
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find "$dir" -name .git -print0 | xargs -0 rm -rf
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else
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find "$dir" -name .git | while read gitdir; do
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make_deterministic_repo "$(readlink -f "$gitdir/..")"
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done
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fi
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}
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clone_user_rev() {
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if ! test -n "$QUIET"; then
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_clone_user_rev "$@"
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else
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errfile="$(mktemp "${TMPDIR:-/tmp}/git-checkout-err-XXXXXXXX")"
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trap "rm -rf \"$errfile\"" EXIT
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_clone_user_rev "$@" 2> "$errfile" || (
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status="$?"
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cat "$errfile" >&2
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exit "$status"
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)
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fi
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}
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print_results() {
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hash="$1"
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if ! test -n "$QUIET"; then
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echo "" >&2
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echo "git revision is $fullRev" >&2
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if test -n "$finalPath"; then
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echo "path is $finalPath" >&2
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fi
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echo "git human-readable version is $humanReadableRev" >&2
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echo "Commit date is $commitDate" >&2
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if test -n "$hash"; then
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echo "hash is $hash" >&2
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fi
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fi
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if test -n "$hash"; then
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echo "{"
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echo " \"url\": \"$url\","
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echo " \"rev\": \"$fullRev\","
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echo -n " \"$hashType\": \"$hash\""
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if test -n "$fetchSubmodules"; then
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echo ","
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echo -n " \"fetchSubmodules\": true"
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fi
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echo ""
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echo "}"
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fi
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}
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if test -z "$branchName"; then
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branchName=fetchgit
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fi
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if test -n "$builder"; then
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test -n "$out" -a -n "$url" -a -n "$rev" || usage
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mkdir $out
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clone_user_rev "$out" "$url" "$rev"
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else
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if test -z "$hashType"; then
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hashType=sha256
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fi
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# If the hash was given, a file with that hash may already be in the
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# store.
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if test -n "$expHash"; then
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finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" "$(url_to_name "$url" "$rev")")
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if ! nix-store --check-validity "$finalPath" 2> /dev/null; then
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finalPath=
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fi
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hash=$expHash
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fi
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# If we don't know the hash or a path with that hash doesn't exist,
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# download the file and add it to the store.
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if test -z "$finalPath"; then
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tmpPath="$(mktemp -d "${TMPDIR:-/tmp}/git-checkout-tmp-XXXXXXXX")"
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trap "rm -rf \"$tmpPath\"" EXIT
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tmpFile="$tmpPath/$(url_to_name "$url" "$rev")"
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mkdir "$tmpFile"
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# Perform the checkout.
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clone_user_rev "$tmpFile" "$url" "$rev"
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# Compute the hash.
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hash=$(nix-hash --type $hashType --base32 $tmpFile)
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# Add the downloaded file to the Nix store.
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finalPath=$(nix-store --add-fixed --recursive "$hashType" "$tmpFile")
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if test -n "$expHash" -a "$expHash" != "$hash"; then
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print_metadata
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echo "hash mismatch for URL \`$url'" >&2
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exit 1
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fi
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fi
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print_results "$hash"
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if test -n "$PRINT_PATH"; then
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echo $finalPath
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fi
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fi
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