forked from mirrors/nixpkgs
53614cf1a7
Add more files to the delete list: * .git/FETCH_HEAD * .git/ORIG_HEAD * .git/refs/remotes/origin/HEAD * .git/config Further, remove all remote branches, remove tags not reachable from the given 'rev', do a full repack and then garbage collect unreferenced objects. According to my testing, the result is fully deterministic. As in "any change done to the upstream repo, ahead of 'rev', will not affect the hash of the resulting 'clone'". Even changing the clone URL will not change the output hash, because .git/config is removed. A new version of git can of course change store format, but that's unavoidable. For big repositories, the repack operation may be a bit heavy. But as far as I can see there is no cheaper way to determinism.
326 lines
8.7 KiB
Bash
Executable file
326 lines
8.7 KiB
Bash
Executable file
#! /bin/sh -e
|
|
|
|
url=
|
|
rev=
|
|
expHash=
|
|
hashType=$NIX_HASH_ALGO
|
|
deepClone=$NIX_PREFETCH_GIT_DEEP_CLONE
|
|
leaveDotGit=$NIX_PREFETCH_GIT_LEAVE_DOT_GIT
|
|
fetchSubmodules=
|
|
builder=
|
|
|
|
if test -n "$deepClone"; then
|
|
deepClone=true
|
|
else
|
|
deepClone=false
|
|
fi
|
|
|
|
if test "$leaveDotGit" != 1; then
|
|
leaveDotGit=
|
|
else
|
|
leaveDotGit=true
|
|
fi
|
|
|
|
|
|
argi=0
|
|
argfun=""
|
|
for arg; do
|
|
if test -z "$argfun"; then
|
|
case $arg in
|
|
--out) argfun=set_out;;
|
|
--url) argfun=set_url;;
|
|
--rev) argfun=set_rev;;
|
|
--hash) argfun=set_hashType;;
|
|
--deepClone) deepClone=true;;
|
|
--no-deepClone) deepClone=false;;
|
|
--leave-dotGit) leaveDotGit=true;;
|
|
--fetch-submodules) fetchSubmodules=true;;
|
|
--builder) builder=true;;
|
|
*)
|
|
argi=$(($argi + 1))
|
|
case $argi in
|
|
1) url=$arg;;
|
|
2) rev=$arg;;
|
|
3) expHash=$arg;;
|
|
*) exit 1;;
|
|
esac
|
|
;;
|
|
esac
|
|
else
|
|
case $argfun in
|
|
set_*)
|
|
var=$(echo $argfun | sed 's,^set_,,')
|
|
eval $var=$arg
|
|
;;
|
|
esac
|
|
argfun=""
|
|
fi
|
|
done
|
|
|
|
usage(){
|
|
echo >&2 "syntax: nix-prefetch-git [options] [URL [REVISION [EXPECTED-HASH]]]
|
|
|
|
Options:
|
|
--out path Path where the output would be stored.
|
|
--url url Any url understand by 'git clone'.
|
|
--rev ref Any sha1 or references (such as refs/heads/master)
|
|
--hash h Expected hash.
|
|
--deepClone Clone submodules recursively.
|
|
--no-deepClone Do not clone submodules.
|
|
--leave-dotGit Keep the .git directories.
|
|
--fetch-submodules Fetch submodules.
|
|
--builder Clone as fetchgit does, but url, rev, and out option are mandatory.
|
|
"
|
|
exit 1
|
|
}
|
|
|
|
if test -z "$url"; then
|
|
usage
|
|
fi
|
|
|
|
|
|
init_remote(){
|
|
local url=$1
|
|
git init
|
|
git remote add origin $url
|
|
}
|
|
|
|
# Return the reference of an hash if it exists on the remote repository.
|
|
ref_from_hash(){
|
|
local hash=$1
|
|
git ls-remote origin | sed -n "\,$hash\t, { s,\(.*\)\t\(.*\),\2,; p; q}"
|
|
}
|
|
|
|
# Return the hash of a reference if it exists on the remote repository.
|
|
hash_from_ref(){
|
|
local ref=$1
|
|
git ls-remote origin | sed -n "\,\t$ref, { s,\(.*\)\t\(.*\),\1,; p; q}"
|
|
}
|
|
|
|
# Fetch everything and checkout the right sha1
|
|
checkout_hash(){
|
|
local hash="$1"
|
|
local ref="$2"
|
|
|
|
if test -z "$hash"; then
|
|
hash=$(hash_from_ref $ref)
|
|
fi
|
|
|
|
git fetch ${builder:+--progress} origin || return 1
|
|
git checkout -b fetchgit $hash || return 1
|
|
}
|
|
|
|
# Fetch only a branch/tag and checkout it.
|
|
checkout_ref(){
|
|
local hash="$1"
|
|
local ref="$2"
|
|
|
|
if "$deepClone"; then
|
|
# The caller explicitly asked for a deep clone. Deep clones
|
|
# allow "git describe" and similar tools to work. See
|
|
# http://thread.gmane.org/gmane.linux.distributions.nixos/3569
|
|
# for a discussion.
|
|
return 1
|
|
fi
|
|
|
|
if test -z "$ref"; then
|
|
ref=$(ref_from_hash $hash)
|
|
fi
|
|
|
|
if test -n "$ref"; then
|
|
# --depth option is ignored on http repository.
|
|
git fetch ${builder:+--progress} --depth 1 origin +"$ref" || return 1
|
|
git checkout -b fetchgit FETCH_HEAD || return 1
|
|
else
|
|
return 1
|
|
fi
|
|
}
|
|
|
|
# Update submodules
|
|
init_submodules(){
|
|
# Add urls into .git/config file
|
|
git submodule init
|
|
|
|
# list submodule directories and their hashes
|
|
git submodule status |
|
|
while read l; do
|
|
# checkout each submodule
|
|
local hash=$(echo $l | awk '{print substr($1,2)}')
|
|
local dir=$(echo $l | awk '{print $2}')
|
|
local name=$(
|
|
git config -f .gitmodules --get-regexp submodule\.[^.]*\.path |
|
|
sed -n "s,^\(.*\)\.path $dir\$,\\1,p")
|
|
local url=$(git config -f .gitmodules --get ${name}.url)
|
|
|
|
# Get Absolute URL if we have a relative URL
|
|
if ! echo "$url" | grep '^[a-zA-Z]\+://' >/dev/null 2>&1; then
|
|
url="$(git config --get remote.origin.url)/$url"
|
|
fi
|
|
|
|
clone "$dir" "$url" "$hash" ""
|
|
done
|
|
}
|
|
|
|
clone(){
|
|
local top=$(pwd)
|
|
local dir="$1"
|
|
local url="$2"
|
|
local hash="$3"
|
|
local ref="$4"
|
|
|
|
cd $dir
|
|
|
|
# Initialize the repository.
|
|
init_remote "$url"
|
|
|
|
# Download data from the repository.
|
|
checkout_ref "$hash" "$ref" ||
|
|
checkout_hash "$hash" "$ref" || (
|
|
echo 1>&2 "Unable to checkout $hash$ref from $url."
|
|
exit 1
|
|
)
|
|
|
|
# Checkout linked sources.
|
|
if test -n "$fetchSubmodules"; then
|
|
init_submodules
|
|
fi
|
|
|
|
if [ -z "$builder" -a -f .topdeps ]; then
|
|
if tg help 2>&1 > /dev/null
|
|
then
|
|
echo "populating TopGit branches..."
|
|
tg remote --populate origin
|
|
else
|
|
echo "WARNING: would populate TopGit branches but TopGit is not available" >&2
|
|
echo "WARNING: install TopGit to fix the problem" >&2
|
|
fi
|
|
fi
|
|
|
|
cd $top
|
|
}
|
|
|
|
# Remove all remote branches, remove tags not reachable from HEAD, do a full
|
|
# repack and then garbage collect unreferenced objects.
|
|
make_deterministic_repo(){
|
|
local repo="$1"
|
|
|
|
# run in sub-shell to not touch current working directory
|
|
(
|
|
cd "$repo"
|
|
# Remove files that contain timestamps or otherwise have non-deterministic
|
|
# properties.
|
|
rm -rf .git/logs/ .git/hooks/ .git/index .git/FETCH_HEAD .git/ORIG_HEAD \
|
|
.git/refs/remotes/origin/HEAD .git/config
|
|
|
|
# Remove all remote branches.
|
|
git branch -r | while read branch; do
|
|
git branch -rD "$branch" >&2
|
|
done
|
|
|
|
# Remove tags not reachable from HEAD. If we're exactly on a tag, don't
|
|
# delete it.
|
|
maybe_tag=$(git tag --points-at HEAD)
|
|
git tag --contains HEAD | while read tag; do
|
|
if [ "$tag" != "$maybe_tag" ]; then
|
|
git tag -d "$tag" >&2
|
|
fi
|
|
done
|
|
|
|
# Do a full repack, for determinism.
|
|
# Repack does not add unreferenced objects to a pack file.
|
|
git repack -A -d -f
|
|
|
|
# Garbage collect unreferenced objects.
|
|
git gc --prune=all
|
|
)
|
|
}
|
|
|
|
|
|
clone_user_rev() {
|
|
local dir="$1"
|
|
local url="$2"
|
|
local rev="${3:-HEAD}"
|
|
|
|
# Perform the checkout.
|
|
case "$rev" in
|
|
HEAD|refs/*)
|
|
clone "$dir" "$url" "" "$rev" 1>&2;;
|
|
*)
|
|
if test -z "$(echo $rev | tr -d 0123456789abcdef)"; then
|
|
clone "$dir" "$url" "$rev" "" 1>&2
|
|
else
|
|
echo 1>&2 "Bad commit hash or bad reference."
|
|
exit 1
|
|
fi;;
|
|
esac
|
|
|
|
local full_revision=$(cd $dir && (git rev-parse $rev 2> /dev/null || git rev-parse refs/heads/fetchgit) | tail -n1)
|
|
echo "git revision is $full_revision"
|
|
echo "git human-readable version is $(cd $dir && (git describe $full_revision 2> /dev/null || git describe --tags $full_revision 2> /dev/null || echo -- none --))" >&2
|
|
|
|
# Allow doing additional processing before .git removal
|
|
eval "$NIX_PREFETCH_GIT_CHECKOUT_HOOK"
|
|
if test -z "$leaveDotGit"; then
|
|
echo "removing \`.git'..." >&2
|
|
find $dir -name .git\* | xargs rm -rf
|
|
else
|
|
find $dir -name .git | while read gitdir; do
|
|
make_deterministic_repo "$(readlink -f "$gitdir/..")"
|
|
done
|
|
fi
|
|
}
|
|
|
|
if test -n "$builder"; then
|
|
test -n "$out" -a -n "$url" -a -n "$rev" || usage
|
|
mkdir $out
|
|
clone_user_rev "$out" "$url" "$rev"
|
|
else
|
|
if test -z "$hashType"; then
|
|
hashType=sha256
|
|
fi
|
|
|
|
# If the hash was given, a file with that hash may already be in the
|
|
# store.
|
|
if test -n "$expHash"; then
|
|
finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" git-export)
|
|
if ! nix-store --check-validity "$finalPath" 2> /dev/null; then
|
|
finalPath=
|
|
fi
|
|
hash=$expHash
|
|
fi
|
|
|
|
# If we don't know the hash or a path with that hash doesn't exist,
|
|
# download the file and add it to the store.
|
|
if test -z "$finalPath"; then
|
|
|
|
tmpPath="$(mktemp -d "${TMPDIR:-/tmp}/git-checkout-tmp-XXXXXXXX")"
|
|
trap "rm -rf \"$tmpPath\"" EXIT
|
|
|
|
tmpFile="$tmpPath/git-export"
|
|
mkdir "$tmpFile"
|
|
|
|
# Perform the checkout.
|
|
clone_user_rev "$tmpFile" "$url" "$rev"
|
|
|
|
# Compute the hash.
|
|
hash=$(nix-hash --type $hashType $hashFormat $tmpFile)
|
|
if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
|
|
|
|
# Add the downloaded file to the Nix store.
|
|
finalPath=$(nix-store --add-fixed --recursive "$hashType" $tmpFile)
|
|
|
|
if test -n "$expHash" -a "$expHash" != "$hash"; then
|
|
echo "hash mismatch for URL \`$url'"
|
|
exit 1
|
|
fi
|
|
fi
|
|
|
|
if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
|
|
|
|
echo $hash
|
|
|
|
if test -n "$PRINT_PATH"; then
|
|
echo $finalPath
|
|
fi
|
|
fi
|